title:
Weighted power counting and Lorentz violating gauge theories. II:
  Classification

abstract:
  We classify the local, polynomial, unitary gauge theories that violate
Lorentz symmetry explicitly at high energies and are renormalizable by weighted
power counting. We study the structure of such theories and prove that
renormalization does not generate higher time derivatives. We work out the
conditions to renormalize vertices that are usually non-renormalizable, such as
the two scalar-two fermion interactions and the four fermion interactions. A
number of four dimensional examples are presented.


title:
Weighted power counting, neutrino masses and Lorentz violating
  extensions of the Standard Model

abstract:
  We study the Standard-Model extensions that have the following features: they
violate Lorentz invariance explicitly at high energies; they are unitary,
local, polynomial and renormalizable by weighted power counting; they contain
the vertex (LH)^2, which gives Majorana masses to the neutrinos after symmetry
breaking, and possibly four fermion interactions; they do not contain
right-handed neutrinos, nor other extra fields. We study the simplest CPT
invariant Standard-Model extension of this type in detail and prove the
cancellation of gauge anomalies. We investigate the low-energy recovery of
Lorentz invariance and comment on other types of extensions.


title:
Constraints from deuterium on the formation of icy bodies in the Jovian
  system and beyond

abstract:
  We consider the role of deuterium as a potential marker of location and
ambient conditions during the formation of small bodies in our Solar system. We
concentrate in particular on the formation of the regular icy satellites of
Jupiter and the other giant planets, but include a discussion of the
implications for the Trojan asteroids and the irregular satellites. We examine
in detail the formation of regular planetary satellites within the paradigm of
a circum-Jovian subnebula. Particular attention is paid to the two extreme
potential subnebulae - "hot" and "cold". In particular, we show that, for the
case of the "hot" subnebula model, the D:H ratio in water ice measured from the
regular satellites would be expected to be near-Solar. In contrast, satellites
which formed in a "cold" subnebula would be expected to display a D:H ratio
that is distinctly over-Solar. We then compare the results obtained with the
enrichment regimes which could be expected for other families of icy small
bodies in the outer Solar system - the Trojan asteroids and the irregular
satellites. In doing so, we demonstrate how measurements by Laplace, the James
Webb Space Telescope, HERSCHEL and ALMA will play an important role in
determining the true formation locations and mechanisms of these objects.


title:
Beam Performance of Tracking Detectors with Industrially Produced GEM
  Foils

abstract:
  Three Gas-Electron-Multiplier tracking detectors with an active area of 10 cm
x 10 cm and a two-dimensional, laser-etched orthogonal strip readout have been
tested extensively in particle beams at the Meson Test Beam Facility at
Fermilab. These detectors used GEM foils produced by Tech-Etch, Inc. They
showed an efficiency in excess of 95% and spatial resolution better than 70 um.
The influence of the angle of incidence of particles on efficiency and spatial
resolution was studied in detail.


title:
Scaling laws and higher-order effects in Coulomb excitation of neutron
  halo nuclei

abstract:
  Essential properties of halo nuclei can be described in terms of a few
low-energy constants. For neutron halo nuclei, analytical results can be found
for wave functions and electromagnetic transition matrix-elements in simple but
well-adapted models. These wave functions can be used to study nuclear
reactions; an especially simple and instructive example is Coulomb excitation.
A systematic expansion in terms of small parameters can be given. We present
scaling laws for excitation amplitudes and cross sections. The results can be
used to analyze experiments like ${}^{11}$Be Coulomb excitation. They also
serve as benchmark tests for more involved reaction theories.


title: Does Charge Contribute to the Frame Dragging of Spacetime?

abstract:
  Electrically charged systems bound by a strong gravitational force can
sustain a huge amount of electric charge (up to 10^20C) against Coulomb
repulsion. General relativistically such systems form a stable hydrostatic
configuration both in the non-rotating and rotating cases. Here we study the
effects of electric charge (electric energy density) on the spacetime outside a
rotating electrically charged system bound by a strong gravitational force. In
particular we investigate the effect of charge density on frame-dragging of
spacetime in the exterior region. Using the coupled Einstein-Maxwell equations
it is found that in the slow rotation approximation charge accumulations not
only acts like an additional mass, thus modifying the spherically symmetric
part of the spacetime, the electric charge also contributes directly to the
dragging of spacetime. A modified Lense-Thirring formula for the spacetime
frame dragging frequency is obtained.


title:
Temporal behaviour of global perturbations in compressible axisymmetric
  flows with free boundaries

abstract:
  The dynamics of small global perturbations in the form of linear combination
of a finite number of non-axisymmetric eigenmodes is studied in two-dimensional
approximation. The background flow is assumed to be an axisymmetric perfect
fluid with the adiabatic index $\gamma=5/3$ rotating with power law angular
velocity distribution $\Omega \propto r^{-q}$, $1.5<q<2.0$, confined by free
boundaries in the radial direction. The substantial transient growth of
acoustic energy of optimized perturbations is discovered. An optimal energy
growth $G$ is calculated numerically for a variety of parameters. Its value
depends essentially on the perturbation azimuthal wavenumber $m$ and increases
for higher values of $m$. The closer the rotation profile to the Keplerian law,
the larger growth factors can be obtained but over a longer time. The highest
acoustic energy increase found numerically is of order $\sim 10^2$ over $\sim
6$ typical Keplerian periods. Slow neutral eigenmodes with corotation radius
beyond the outer boundary mostly contribute to the transient growth. The
revealed linear temporal behaviour of perturbations may play an important role
in angular momentum transfer in toroidal flows near compact relativistic
objects.


title:
Monte-Carlo-Simulations of Stochastic Differential Equations at the
  Example of the Forced Burgers' Equation

abstract:
  We investigate the behaviour of stochastic differential equations, especially
Burgers' eq., by means of Monte-Carlo-techniques.


title:
Dynamics of interacting dark energy model in Einstein and Loop Quantum
  Cosmology

abstract:
  We investigate the background dynamics when dark energy is coupled to dark
matter in the universe described by Einstein cosmology and Loop Quantum
Cosmology. We introduce a new general form of dark sector coupling, which
presents us a more complicated dynamical phase space. Differences in the phase
space in obtaining the accelerated scaling attractor in Einstein cosmology and
Loop Quantum Cosmology are disclosed.


title:
Conserving approximations in time-dependent quantum transport: Initial
  correlations and memory effects

abstract:
  We study time-dependent quantum transport in a correlated model system by
means of time-propagation of the Kadanoff-Baym equations for the nonequilibrium
many-body Green function. We consider an initially contacted equilibrium system
of a correlated central region coupled to tight-binding leads. Subsequently a
time-dependent bias is switched on after which we follow in detail the
time-evolution of the system. Important features of the Kadanoff-Baym approach
are 1) the possibility of studying the ultrafast dynamics of transients and
other time-dependent regimes and 2) the inclusion of exchange and correlation
effects in a conserving approximation scheme. We find that initial correlation
and memory terms due to many-body interactions have a large effect on the
transient currents. Furthermore the value of the steady state current is found
to be strongly dependent on the approximation used to treat the electronic
interactions.


title:
On the stable configuration of ultra-relativistic material spheres. The
  solution for the extremely hot gas

abstract:
  During the last stage of collapse of a compact object into the horizon of
events, the potential energy of its surface layer decreases to a negative value
below all limits. The energy-conservation law requires an appearance of a
positive-valued energy to balance the decrease. We derive the internal-state
properties of the ideal gas situated in an extremely strong, ultra-relativistic
gravitational field and suggest to apply our result to a compact object with
the radius which is slightly larger than or equal to the Schwarzschild's
gravitational radius. On the surface of the object, we find that the extreme
attractivity of the gravity is accompanied with an extremely high internal,
heat energy. This internal energy implies a correspondingly high pressure, the
gradient of which has such a behavior that it can compete with the gravity. In
a more detail, we find the equation of state in the case when the magnitude of
the potential-type energy of constituting gas particles is much larger than
their rest energy. This equation appears to be identical with the
general-relativity condition of the equilibrium between the gravity and
pressure gradient. The consequences of the identity are discussed.


title: A New Class of Radio Pulsars - Back in 1982

abstract:
  Basic ideas about the torques on the neutron star and the existence of an
equilibrium rotation period followed from the recognition that most X-ray
binaries contain accretion powered neutron stars. The evolution of binaries
through a phase of accretion onto the neutron star, eventually leading to a
post-accretion radio pulsar phase, was initially discussed as a way to
understand the scarcity of binaries among the radio pulsars and the relatively
short rotation periods of the first discovered binary radio pulsars in terms of
magnetic fields that would be smaller than the familiar $10^{12} G$ range. The
discovery of the millisecond pulsars made us realize that the fields can be
much lower in a new class of radio pulsars that have been spun up by accretion
in LMXBs. The predicted spin-down rates of the millisecond pulsar was soon
confirmed. The observers' search for millisecond X-ray periods was on, leading
first to the discovery of QPOs, and eventually to the discovery of the X-ray
millisecond pulsars. The theorists' quest for explanations of why X-ray
millisecond pulsations are not observed from LMXBs also started right away.


title: On functions of Jacobi-Weierstrass (I) and equation of Painleve

abstract:
  The paper is an essentially extended version of the work math.CA/0601371,
supplemented with an application. We present new results in the theory of
classical $\theta$-functions of Jacobi and $\sigma$-functions of Weierstrass:
ordinary differential equations and series expansions. We also give the
extension of canonical $\theta$-functions and consider an application to the
sixth Painlev\'e equation (P6). Picard--Hitchin's general solution of P6 is
represented explicitly in a form of logarithmic derivative of a corresponding
$\tau$-function (Painlev\'e's form).


title: Size effect on thermodynamic properties of free nanocrystals

abstract:
  We demonstrate that the discrete character of the vibrational spectrum of a
small crystal accounts for size dependence of its thermodynamic properties and
melting temperature. Using a self-consistent statistical method [Phys. Rev.B
66, 054302 (2002)] we derive the Gibbs free energy of free nanocrystalline
plates and calculate the thermodynamic parameters as functions of plate
thickness for Cu.


title: Discreteness Criteria and the Hyperbolic Geometry of Palindroms

abstract:
  We consider non-elementary representations of two generator free groups in
$PSL(2,\mathbb{C})$, not necessarily discrete or free, $G = < A, B >$. A word
in $A$ and $B$, $W(A,B)$, is a palindrome if it reads the same forwards and
backwards. A word in a free group is {\sl primitive} if it is part of a minimal
generating set. Primitive elements of the free group on two generators can be
identified with the positive rational numbers. We study the geometry of
palindromes and the action of $G$ in $\HH^3$ whether or not $G$ is discrete. We
show that there is a {\sl core geodesic} $\L$ in the convex hull of the limit
set of $G$ and use it to prove three results: the first is that there are well
defined maps from the non-negative rationals and from the primitive elements to
$\L$; the second is that $G$ is geometrically finite if and only if the axis of
every non-parabolic palindromic word in $G$ intersects $\L$ in a compact
interval; the third is a description of the relation of the pleating locus of
the convex hull boundary to the core geodesic and to palindromic elements.


title: Periodic orbits of linear endomorphisms on the 2-torus and its lattices

abstract:
  Counting periodic orbits of endomorphisms on the 2-torus is considered, with
special focus on the relation between global and local aspects and between the
dynamical zeta function on the torus and its analogue on finite lattices. The
situation on the lattices, up to local conjugacy, is completely determined by
the determinant, the trace and a third invariant of the matrix defining the
toral endomorphism.


title:
Pseudoscalar bosonic excitations in the color-flavor locked phase at
  moderate densities

abstract:
  The properties of pseudoscalar bosonic excitations in the color-flavor locked
phase at moderate densities are studied within a model of the
Nambu--Jona-Lasinio type. Our previous analysis is extended to Goldstone bosons
with hidden flavor and to higher-lying modes which stay massive in the chiral
limit. The bosons are constructed explicitly by solving the Bethe-Salpeter
equation for quark-quark scattering in random phase approximation. The masses
and weak decay constants of the Goldstone bosons are found in good agreement
with predictions from the low-energy effective theory. In the non-Goldstone
sector we find an SU(3) octet which is weakly bound, while the singlet appears
to be unbound.


title:
Spin-Orbit Integrated Ground State and Magnetic Anisotropy in
  Sr$_2$IrO$_4$

abstract:
  We present a microscopic model for the anisotropic exchange interactions in
Sr$_{2}$IrO$_{4}$. A direct construction of Wannier functions from
first-principles calculations proves the $j_{\mathrm{eff}}$=1/2 character of
the spin-orbit integrated states at the Fermi level. An effective
$j_{\mathrm{eff}}$-spin Hamiltonian explains the observed weak ferromagnetism
and anisotropy of antiferromagnetically ordered magnetic state, which arise
naturally from the $j_{\mathrm{eff}}$=1/2 state with a rotation of IrO$_{6}$
octahedra. It is suggested that Sr$_{2}$IrO$_{4}$ is a unique class of
materials with effective exchange interactions in the spin-orbital Hilbert
space.


title: X-Ray Afterglows

abstract:
  We summarise the X-ray temporal and spectral variability properties of GRBs
as observed using the Swift satellite. Despite much individual complexity, the
flux and spectral variability can be reasonably well described by a combination
of two components - which we denote as the prompt and the afterglow. The first,
prompt component consists of the burst and its initial decay while the second,
afterglow component fits the X-ray plateau phase and subsequent decline
observed in the majority of GRBs. When strong spectral variability occurs it is
associated with the prompt component while the X-ray plateau and later emission
shows little if any spectral variability. We briefly compare the observations
with some of the proposed models. Any model for the early or late emission must
explain the differences in both temporal and spectral behaviour.


title: Instanton Counting and Dielectric Branes

abstract:
  We consider the Hanany-Witten type brane configuration in a background of RR
4-form field strength and examine the behavior of Euclidean D0-branes
propagating between two NS5-branes. We evaluate the partition function of the
D0-branes and show that it coincides with the Nekrasov partition function of
instantons for four-dimensional N=2 supersymmetric Yang-Mills theory. In this
analysis, the Myers effect plays a crucial role. We apply the same method to
the brane configuration realizing four-dimensional N=2 theory with
hypermultiplets in the fundamental representation and reproduce the
corresponding Nekrasov partition function.


title:
K-processes, scaling limit and aging for the trap model in the complete
  graph

abstract:
  We study K-processes, which are Markov processes in a denumerable state
space, all of whose elements are stable, with the exception of a single state,
starting from which the process enters finite sets of stable states with
uniform distribution. We show how these processes arise, in a particular
instance, as scaling limits of the trap model in the complete graph, and
subsequently derive aging results for those models in this context.


title: Tail asymptotics for a random sign Lindley recursion

abstract:
  We investigate the tail behaviour of the steady state distribution of a
stochastic recursion that generalises Lindley's recursion. This recursion
arises in queuing systems with dependent interarrival and service times, and
includes alternating service systems and carousel storage systems as special
cases. We obtain precise tail asymptotics in three qualitatively different
cases, and compare these with existing results for Lindley's recursion and for
alternating service systems.


title: Gate-voltage dependence of Kondo effect in a triangular quantum dot

abstract:
  We study the conductance through a triangular triple quantum dot, which are
connected to two noninteracting leads, using the numerical renormalization
group (NRG). It is found that the system shows a variety of Kondo effects
depending on the filling of the triangle. The SU(4) Kondo effect occurs at
half-filling, and a sharp conductance dip due to a phase lapse appears in the
gate-voltage dependence. Furthermore, when four electrons occupy the three
sites on average, a local S=1 moment, which is caused by the Nagaoka mechanism,
is induced along the triangle. The temperature dependence of the entropy and
spin susceptibility of the triangle shows that this moment is screened by the
conduction electrons via two separate stages at different temperatures. The
two-terminal and four-terminal conductances show a clear difference at the gate
voltages, where the SU(4) or the S=1 Kondo effects occurring.


title: Thermally activated switching in the presence of non-Gaussian noise

abstract:
  We study the effect of a non-Gaussian noise on interstate switching activated
primarily by Gaussian noise. Even weak non-Gaussian noise can strongly change
the switching rate. The effect is determined by all moments of the noise
distribution. The explicit analytical results are compared with the results of
simulations for an overdamped system driven by white Gaussian noise and a
Poisson noise. Switching induced by a purely Poisson noise is also discussed.


title:
The ratio of shear viscosity to entropy density in generalized theories
  of gravity

abstract:
  Near the horizon of a black brane solution in Anti-de Sitter space, the
long-wavelength fluctuations of the metric exhibit hydrodynamic behaviour. For
Einstein's theory, the ratio of the shear viscosity of near-horizon metric
fluctuations eta to the entropy per unit of transverse volume s is eta/s=1/4
pi. We propose that, in generalized theories of gravity, this ratio is given by
the ratio of two effective gravitational couplings and can be different than
1/4 pi. Our proposal implies that eta/s is equal for any pair of gravity
theories that can be transformed into each other by a field redefinition. In
particular, the ratio is 1/4 pi for any theory that can be transformed into
Einstein's theory; such as F(R) gravity. Our proposal also implies that matter
interactions -- except those including explicit or implicit factors of the
Riemann tensor -- will not modify eta/s. The proposed formula reproduces, in a
very simple manner, some recently found results for Gauss-Bonnet gravity. We
also make a prediction for eta/s in Lovelock theories of any order or
dimensionality.


title:
Differential systems with Fuchsian linear part: correction and
  linearization, normal forms and multiple orthogonal polynomials

abstract:
  Differential systems with a Fuchsian linear part are studied in regions
including all the singularities in the complex plane of these equations. Such
systems are not necessarily analytically equivalent to their linear part (they
are not linearizable) and obstructions are found as a unique nonlinear
correction after which the system becomes formally linearizable.
  More generally, normal forms are found.
  The corrections and the normal forms are found constructively. Expansions in
multiple orthogonal polynomials and their generalization to matrix-valued
polynomials are instrumental to these constructions.


title: Gravitational production of KK states

abstract:
  Gravitational particle production in the context of braneworlds is considered
from a phenomenological point of view. The production of KK modes for bulk
fields is discussed and their abundances computed. The results have been
applied to some specific fields such as gravitinos and axions, and their
cosmologies have been outlined, exemplifying the constraints on the properties
of the extra dimensional model in each case.


title:
Suzaku Observation of 30Dor C: A Supernova Remnant with the Largest
  Non-Thermal Shell

abstract:
  This paper reports on the Suzaku results of thermal and non-thermal features
of 30 Dor C, a supernova remnant (SNR) in a superbubble of the Large Magellanic
Cloud (LMC). The west rim exhibits a non-thermal X-ray spectrum with no thermal
component. A single power-law model is rejected but a power-law model with
spectral cutoff is accepted. The cutoff frequency of $(3-7)\times 10^{17}$ Hz
is the highest among the shell type SNRs like SN 1006 ($\sim 6\times 10^{16}$
Hz), and hence 30 Dor C would be the site of the highest energy accelerator of
the SNR shock. The southeast (SE) and northeast (NE) rims have both the thermal
and non-thermal components. The thin-thermal plasmas in the both rims are in
collisional ionization equilibrium state. The electron temperature of the
plasma in the SE rim ($kT_e \sim 0.7$ keV) is found to be higher than the
previously reported value. The power-law index from SE is nearly the same as,
while that from the NE is larger than that of the West rim. The SNR age would
be in the range of $(4-20)\times 10^3$ yr. Thus, 30 Dor C is likely to be the
oldest shell-like SNR with non-thermal emission.


title: Cooperative Protocols for Random Access Networks

abstract:
  Cooperative communications have emerged as a significant concept to improve
reliability and throughput in wireless systems. On the other hand, WLANs based
on random access mechanism have become popular due to ease of deployment and
low cost. Since cooperation introduces extra transmissions among the
cooperating nodes and therefore increases the number of packet collisions, it
is not clear whether there is any benefit from using physical layer cooperation
under random access. In this paper, we develop new low complexity cooperative
protocols for random access that outperform the conventional non cooperative
scheme for a large range of signal-to-noise ratios.


title: Chaotic Scattering in the Regime of Weakly Overlapping Resonances

abstract:
  We measure the transmission and reflection amplitudes of microwaves in a
resonator coupled to two antennas at room temperature in the regime of weakly
overlapping resonances and in a frequency range of 3 to 16 GHz. Below 10.1 GHz
the resonator simulates a chaotic quantum system. The distribution of the
elements of the scattering matrix S is not Gaussian. The Fourier coefficients
of S are used for a best fit of the autocorrelation function if S to a
theoretical expression based on random--matrix theory. We find very good
agreement below but not above 10.1 GHz.


title:
On the Growth Rate of the Weight Distribution of Irregular
  Doubly-Generalized LDPC Codes

abstract:
  In this paper, an expression for the asymptotic growth rate of the number of
small linear-weight codewords of irregular doubly-generalized LDPC (D-GLDPC)
codes is derived. The expression is compact and generalizes existing results
for LDPC and generalized LDPC (GLDPC) codes. Assuming that there exist check
and variable nodes with minimum distance 2, it is shown that the growth rate
depends only on these nodes. An important connection between this new result
and the stability condition of D-GLDPC codes over the BEC is highlighted. Such
a connection, previously observed for LDPC and GLDPC codes, is now extended to
the case of D-GLDPC codes.


title: A note on DSR

abstract:
  I study the physical meaning of Deformed, or Doubly, Special Relativity
(DSR). I argue that DSR could be physically relevant in a certain
large-distance limit. I consider a concrete physical effect: the gravitational
slowing down of time due to the gravitational potential well of a
massive-particle, and its effect on the dynamics of the particle itself. I
argue that this physical effect can survive in a limit in which gravitation and
quantum mechanics can be disregarded, and that taking it into account leads
directy to the Girelli-Livine DSR formalism. This provides a physical
interpretation to the corresponding 5d spacetime, and a concrete physical
derivation of DSR.


title: Extraction of SUSY Parameters from Collider Data

abstract:
  The extraction of the parameters of the supersymmetric Lagrangian is discusse
d. Particular emphasis is put on the rigorous treatment of experimental and
theo retical errors. While the LHC can provide a valuable first estimate of the
parameters, the combination of LHC and ILC will be nece ssary to determine with
high precision the parameters of the MSSM.


title:
Pairing Vibrations Study with the Time-Dependent Hartree-Fock-Bogoliubov
  theory

abstract:
  We study pairing vibrations in $^{18,20,22}$O and $^{42,44,46}$Ca nuclei
solving the time-dependent Hartree-Fock-Bogoliubov equation in coordinate space
with spherical symmetry. We use the SLy4 Skyrme functional in the normal part
of the energy density functional and a local density dependent functional in
its pairing part. Pairing vibrations are excited by two-neutron transfer
operators. Strength distributions are obtained using the Fourier transform of
the time-dependent response of two-neutron pair-transfer observables in the
linear regime. Results are in overall agreement with quasiparticle random phase
approximation calculations for Oxygen isotopes, though differences appear when
increasing the neutron number. Both low lying pairing modes and giant pairing
vibrations (GPV) are discussed. The GPV is observed in the Oxygen but not in
the Calcium isotopes.


title:
Comprehensive Analysis of Neutrinos in SK part 3 -- L/E Analysis for
  Single Ring Muon Events II --

abstract:
  Following the L_nu/E_nu analysis in the preceding paper of the Fully
Contained Muon Events resulting from the quasi-elastic scattering obtained from
our numerical computer experiment. In the present paper, we carry out the
analyses of L_nu/E_mu, L_mu/E_nu and L_mu/E_mu among four possible combinations
of L and E. As the result of it, we show that we can not find the
characteristis of maximum oscillation for neutrino oscillation among two of
three, L_mu/E_mu and L_mu/E_nu. Only the L_nu/E_mu distribution can show
something like maximum oscillation, however it cannot be detected owing to the
neutral character of L_nu. It is concluded that the Super-Kamiokande Experiment
could not have found the existence of the maximum oscillation for neutrino
oscillation.


title: Heavy-to-heavy quark decays at NNLO

abstract:
  Details of a recent calculation of O(alpha_s^2) corrections to the decay b ->
c,l,nu_l, taking into account the c-quark mass, are described. Construction of
the expansion in the mass ratio m_c/m_b as well as the evaluation of new
four-loop master integrals are presented. The same techniques are applicable to
the muon decay, mu -> e,nu_mu,anti-nu_e. Analytical results are presented, for
the physical cases as well as for a model with purely-vector couplings.


title:
A Reconstruction Algorithm for Photoacoustic Imaging based on the
  Nonuniform FFT

abstract:
  Fourier reconstruction algorithms significantly outperform conventional
back-projection algorithms in terms of computation time. In photoacoustic
imaging, these methods require interpolation in the Fourier space domain, which
creates artifacts in reconstructed images. We propose a novel reconstruction
algorithm that applies the one-dimensional nonuniform fast Fourier transform to
photoacoustic imaging. It is shown theoretically and numerically that our
algorithm avoids artifacts while preserving the computational effectiveness of
Fourier reconstruction.


title:
Conditional probability based significance tests for sequential patterns
  in multi-neuronal spike trains

abstract:
  In this paper we consider the problem of detecting statistically significant
sequential patterns in multi-neuronal spike trains. These patterns are
characterized by ordered sequences of spikes from different neurons with
specific delays between spikes. We have previously proposed a data mining
scheme to efficiently discover such patterns which are frequent in the sense
that the count of non-overlapping occurrences of the pattern in the data stream
is above a threshold. Here we propose a method to determine the statistical
significance of these repeating patterns and to set the thresholds
automatically. The novelty of our approach is that we use a compound null
hypothesis that includes not only models of independent neurons but also models
where neurons have weak dependencies. The strength of interaction among the
neurons is represented in terms of certain pair-wise conditional probabilities.
We specify our null hypothesis by putting an upper bound on all such
conditional probabilities. We construct a probabilistic model that captures the
counting process and use this to calculate the mean and variance of the count
for any pattern. Using this we derive a test of significance for rejecting such
a null hypothesis. This also allows us to rank-order different significant
patterns. We illustrate the effectiveness of our approach using spike trains
generated from a non-homogeneous Poisson model with embedded dependencies.

categories: q-bio.NC cond-mat.dis-nn cs.DB q-bio.QM stat.ME


title: Aperiodic Ising model on the Bethe lattice: Exact results

abstract:
  We consider the Ising model on the Bethe lattice with aperiodic modulation of
the couplings, which has been studied numerically in Phys. Rev. E 77, 041113
(2008). Here we present a relevance-irrelevance criterion and solve the
critical behavior exactly for marginal aperiodic sequences. We present
analytical formulae for the continuously varying critical exponents and discuss
a relationship with the (surface) critical behavior of the aperiodic quantum
Ising chain.


title: A Chevalley's theorem in class C^r

abstract:
  Let W be a finite reflection group acting orthogonally on R^n, P be the
Chevalley polynomial mapping determined by an integrity basis of the algebra of
W-invariant polynomials, and h be the highest degree of the coordinate
polynomials in P.There exists a linear mapping from (C^r(R^n))^W to
C^[r/h](R^n), f\mapsto F such that f=F \circ P, continuous for the natural
Fr\'echet topologies. A general counterexample shows that this result is the
best possible. The proof uses techniques of division by linear forms and a
study of compensation phenomenons. An extension to P^{-1}(R^n) of invariant
formally holomorphic regular fields is needed.


title: Logarithmic current fluctuations in non-equilibrium quantum spin chains

abstract:
  We study zero-temperature quantum spin chains which are characterized by a
non-vanishing current. For the XX model starting from the initial state |... +
+ + - - - ...> we derive an exact expression for the variance of the total spin
current. We show that asymptotically the variance exhibits an anomalously slow
logarithmic growth; we also extract the sub-leading constant term. We then
argue that the logarithmic growth remains valid for the XXZ model in the
critical region.


title: Generating Static Fluid Spheres by Conformal Transformations

abstract:
  We generate an explicit four-fold infinity of physically acceptable exact
perfect fluid solutions of Einstein's equations by way of conformal
transformations of physically unacceptable solutions (one way to view the use
of isotropic coordinates). Special cases include the Schwarzschild interior
solution and the Einstein static universe. The process we consider involves
solving two equations of the Riccati type coupled by a single generating
function rather than a specification of one of the two metric functions.


title: Edge percolation on a random regular graph of low degree

abstract:
  Consider a uniformly random regular graph of a fixed degree $d\ge3$, with $n$
vertices. Suppose that each edge is open (closed), with probability $p(q=1-p)$,
respectively. In 2004 Alon, Benjamini and Stacey proved that $p^*=(d-1)^{-1}$
is the threshold probability for emergence of a giant component in the subgraph
formed by the open edges. In this paper we show that the transition window
around $p^*$ has width roughly of order $n^{-1/3}$. More precisely, suppose
that $p=p(n)$ is such that $\omega:=n^{1/3}|p-p^*|\to\infty$. If $p<p^*$, then
with high probability (whp) the largest component has $O((p-p^*)^{-2}\log n)$
vertices. If $p>p^*$, and $\log\omega\gg\log\log n$, then whp the largest
component has about $n(1-(p\pi+q)^d)\asymp n(p-p^*)$ vertices, and the second
largest component is of size $(p-p^*)^{-2}(\log n)^{1+o(1)}$, at most, where
$\pi=(p\pi+q)^{d-1},\pi\in(0,1)$. If $\omega$ is merely polylogarithmic in $n$,
then whp the largest component contains $n^{2/3+o(1)}$ vertices.


title: Overview of the theory of W/Z + jets and heavy flavor

abstract:
  I review the status of theoretical predictions for events containing a W or Z
boson and jets, one or more of which may include heavy quarks. Special
attention is paid to comparisons between different theoretical approaches and
with the latest experimental data.


title: Topologie sur l'ensemble des parties positives d'un r\'eseau

abstract:
  We define a notion of {\it positive part} of a lattice $\Lambda$ and we endow
the set of such positive parts with a topology. We then study some properties
of this topology, by comparing it with the one of $V^*/\RM_{> 0}$, where $V^*$
is the dual vector space of $\RM \otimes_\ZM \Lambda$.


title:
Theory of Cherenkov radiation in periodic dielectric media: Emission
  spectrum

abstract:
  The Cherenkov radiation is substantially modified in the presence of a medium
with a nontrivial dispersion relation. We consider Cherenkov emission spectra
of a point charge moving in general three- (3D) and two-dimensional (2D)
photonic crystals. Exact analytical expressions for the spectral distribution
of the radiated power are obtained in terms of the Bloch mode expansion. The
resulting expression reduces to a simple contour integral (3D case) or a
one-dimensional sum (2D case) over a small fraction of the reciprocal space,
which is defined by the generalized Cherenkov condition. We apply our method to
a specific case of an electron moving with different velocities in a 2D
square-lattice photonic crystal. Our method demonstrates an excellent agreement
with numerically rigorous finite-difference time-domain calculations while
being less demanding on computational resources.


title:
Unconventional pairs glued by conventional phonons in cuprate
  superconductors

abstract:
  It has gone almost unquestioned that superexchange in the t-J (or Hubbard)
model, and not phonons, is responsible for the unconventional ("d-wave")
pairing symmetry of cuprate superconductors. However a number of advanced
numerical studies have not found superconductivity in the Hubbard model. On the
other hand compelling experimental evidence for a strong electron-phonon
interaction (EPI) has currently arrived. Here I briefly review some
phonon-mediated unconventional pairing mechanisms. In particular the anisotropy
of sound velocity makes the phonon-mediated attraction of electrons non-local
in space providing unconventional Cooper pairs with a nonzero orbital momentum
already in the framework of the conventional BCS theory with weak EPI. In the
opposite limit of strong EPI rotational symmetry breaking appears as a result
of a reduced Coulomb repulsion between unconventional bipolarons. Using the
variational Monte-Carlo method we have found that a relatively weak
finite-range EPI induces a d-wave BCS state also in doped Mott-Hubbard
insulators or strongly-correlated metals. These results tell us that poorly
screened EPI with conventional phonons is responsible for the unconventional
pairing in cuprate superconductors.


title:
The universal Cannon--Thurston maps and the boundary of the curve
  complex

abstract:
  In genus two and higher, the fundamental group of a closed surface acts
naturally on the curve complex of the surface with one puncture. Combining
ideas from previous work of Kent--Leininger--Schleimer and Mitra, we construct
a universal Cannon--Thurston map from a subset of the circle at infinity for
the closed surface group onto the boundary of the curve complex of the
once-punctured surface. Using the techniques we have developed, we also show
that the boundary of this curve complex is locally path-connected.


title: Semicontinuity properties of Kazhdan-Lusztig cells

abstract:
  Computations in small Coxeter groups or dihedral groups suggest that the
partition into Kazhdan-Lusztig cells with unequal parameters should obey to
some semicontinuity phenomenon (as the parameters vary). The aim of this paper
is to provide a rigorous theoretical background for supporting this intuition
that will allow to state several precise conjectures.


title:
Homologous Core Collapse in a Massive Star and Self-Similar Evolution of
  Rebound Shocks

abstract:
  During the gravitational core collapse of a massive progenitor star which may
give rise to at least a class of gamma-ray bursts (GRBs) associated with
supernovae, a stellar core rapidly passes through a short yet important phase
of neutronization, producing a huge amount of energetic neutrinos and photons
which contribute to the total pressure within the progenitor core. The
collection of neutrinos, photons and gas materials together may be approximated
as a fluid with a polytropic index $\gamma=4/3$ under the action of
self-gravity. With a substantial generalization and using analytical and
numerical methods (Lou & Cao 2008), we recently constructed and examined
various self-similar solutions to describe collapses, rebound shocks and flows
systematically in a $\gamma=4/3$ polytropic gas mixture with spherical
symmetry, and compare our results with those of Goldreich & Weber (1980). It is
also possible to construct central void solutions without or with shocks.
Various features and characteristics of this nonlinear relativistically hot gas
dynamics, including asymptotic and exact solutions, are presented. This more
general polytropic model analysis provides the dynamic basis of understanding
the evolution of rebound shocks in supernovae (SNs) and the results may be also
utilized to benchmark hydrodynamic simulations.


title:
Measurement of the B+ -> omega l+ nu and B+ -> eta l+ nu Branching
  Fractions

abstract:
  We present a study of the charmless semileptonic B-meson decays B+ -> omega
l+ nu and B+ -> eta l+ nu. The analysis is based on 383 million BBbar pairs
recorded at the Upsilon(4S) resonance with the BABAR detector. The omega mesons
are reconstructed in the channel omega -> pi+ pi- pi0 and the eta mesons in the
channels eta -> pi+ pi- pi0 and eta -> gamma gamma. We measure the branching
fractions B(B+ -> omega l+ nu) = (1.14 +- 0.16 (stat) +- 0.08 (syst)) x 10^-4
and B(B+ -> eta l+ nu) = (0.31 +- 0.06 (stat) +- 0.08 (syst)) x 10^-4.


title: Mass and total energy of moving bodies in a quantified expansion

abstract:
  In this paper, we present a new formulation of Lorentz transformations using
a metric that quantifies the space expansion. As a consequence, we sort out
that the limiting velocity of moving bodies is decreasing together with the
space expansion. A new adjustment of relativistic laws is added to incorporate
the non static nature of space-time. The conservation of the physical laws at
each step of the quantified expansion allows the obtaining of new formalisms
for the physical laws, in particular when an object starts moving under any
force, its total energy, momentum and mass are directly affected by the
expansion of the space. An example of inelastic collision is studied and
several conclusions derived, specially the example of fission of atoms leads to
clear correlation between liberated energy and universe expansion, it turns out
that the liberated energy is increasing together with the universe expansion.


title:
Thermoelectric Effects in Anisotropic Systems: Measurement and
  Applications

abstract:
  The Harman method for measuring the thermal conductivity of a sample using
the Peltier effect, may also be used to determine the dimensionless figure of
merit from just two electrical resistance measurements. We consider a modified
version of the Harman method where the current contacts are much smaller than
the contact faces of the sample. We calculate the voltage and temperature
distributions in a rectangular sample of a material having anisotropy in all of
its transport coefficients. The thermoelectric anisotropy has important
consequences in the form of thermoelectric eddy currents and the Bridgman
effect. We prove that in the limit of a very thin sample of arbitrary shape,
there exist van der Pauw formulae relating particular linear combinations of
the potential and temperature differences between points on the edges of the
sample. We show that the Harman figure of merit can be radically different from
the intrinsic figures of merit of the material, and can often be substantially
enhanced. By defining an effective figure of merit in terms of the rate of
entropy production, we show that the increase in the Harman figure of merit
does indicate an improvement in the thermoelectric performance of an
anisotropic sample having small current contacts. However, we also prove that
in the case of a material with tetragonal symmetry, the effective figure of
merit is always bounded from above by the largest intrinsic figure of merit of
the material.


title:
The influence of direct $D$-meson production to the determination on the
  nucleon strangeness asymmetry via dimuon events in neutrino experiments

abstract:
  Experimentally, the production of oppositely charged dimuon events by
neutrino and anti-neutrino deep inelastic scattering (DIS) is used to determine
the strangeness asymmetry inside a nucleon. Here we point out that the direct
production of $D$-meson in DIS may make substantial influence to the
measurement of nucleon strange distributions. The direct $D$-meson production
is via the heavy quark recombination (HQR) and via the light quark
fragmentation from perturbative QCD (LQF-P). To see the influence precisely, we
compute the direct $D$-meson productions via HQR and LQF-P quantitatively and
estimate their corrections to the analysis of the strangeness asymmetry. The
results show that HQR has stronger effect than LQF-P does, and the former may
influence the experimental determination of the nucleon strangeness asymmetry.


title: Interaction between negative and positive index medium waveguides

abstract:
  The coupling between negative and positive index medium waveguides is
investigated theoretically in this paper. A coupled mode theory is developed
for such a waveguide system and its validity is verified. Interesting phenomena
in the coupled waveguides are demonstrated, which occur in the case when the
negative index medium waveguide in isolation guides its mode backward. A new
type of coupled mode solution that varies exponentially with the coupling
length is found in the special case when the propagation constants of two
individual waveguides are nearly the same. A coupler operating in this case is
insensitive to the coupling length, and its coupling efficiency can reach 100%
as long as the coupling length is long enough. However, when the propagation
constants of the two individual waveguides differ greatly, the coupled mode
solution is still a periodic function of the coupling length, but the coupled
power is output backward. In addition, the modes in the composite waveguide
system are also studied using the coupled mode theory, and their fundamental
properties are revealed.


title:
On the fine structure photodetachment intensities using the irreducible
  tensorial expression of second quantization operators

abstract:
  The branching ratios of the fine-structure photodetachment intensities of S-
have been calculated by Blondel et al. (J. Phys. B 39(2006)1409) using the
standard irreducible tensorial operator techniques. They observed that the
relative intensities were consistent with the well known Engelking-Lineberger
formula (Phys. Rev. A19(1979)149) derived from the fractional parentage
approach, and qualified this agreement as remarkable. In the present paper, we
show that it can be understood from a general interesting angular momentum
expression relating a weighted sum of squared 9j-symbols and a weighted sum of
products of squared 6j-symbols. We also point out that the standard approach
result is a special case of the photodetachment cross sections parametrization
by Pan and Starace (Phys. Rev. A47(1993)295) who already established the link
with the Engelking-Lineberger's result. The present work provides a new,
elegant and deep link between the two formalisms, thanks to the irreducible
tensorial expression of the second quantization form of the electric dipole
transition operator.


title: On the Percolation BCFT and the Crossing Probability of Watts

abstract:
  The logarithmic conformal field theory describing critical percolation is
further explored using Watts' determination of the probability that there
exists a cluster connecting both horizontal and vertical edges. The boundary
condition changing operator which governs Watts' computation is identified with
a primary field which does not fit naturally within the extended Kac table.
Instead a "shifted" extended Kac table is shown to be relevant. Augmenting the
previously known logarithmic theory based on Cardy's crossing probability by
this field, a larger theory is obtained, in which new classes of indecomposable
rank-2 modules are present. No rank-3 Jordan cells are yet observed. A highly
non-trivial check of the identification of Watts' field is that no
Gurarie-Ludwig-type inconsistencies are observed in this augmentation. The
article concludes with an extended discussion of various topics related to
extending these results including projectivity, boundary sectors and
inconsistency loopholes.


title:
A sphere moving down the surface of a static sphere and a simple phase
  diagram

abstract:
  A small sphere placed on the top of a big static frictionless sphere, slips
until it leaves the surface at an angle $\theta_{l}=\cos^{-1}{2/3}$. On the
other extreme, if the surface of the big sphere has coefficient of static
friction, $\mu_s\to\infty$, the small sphere starts rolling and continues to do
so until it leaves the surface at an angle $\theta_{l} =\cos^{-1}{10/17}$. In
the case where, $0\leq\mu_s<\infty$, we get a simple phase diagram. The three
phases are pure rolling, rolling with slipping and detached state. One phase
line separates pure rolling from rolling with slipping. This diagram is
obtained when stopping angles for pure rolling are plotted against static
friction coefficients $\mu_s$. Study in this article is restricted to the case
when the mobile sphere starts at the top of the static sphere with
infinitesimal kinetic energy.


title:
Dynamic origin of the morphotropic phase boundary - Soft modes and phase
  instability in 0.68Pb(Mg1/3Nb2/3O3)-0.32PbTiO3

abstract:
  We report neutron inelastic scattering on single crystal
0.68Pb(Mg1/3Nb2/3O3)-0.32PbTiO3 (PMN-0.32PT), a relaxor ferroelectric material
that lies within the compositional range of the morphotropic phase boundary
(MPB). Data were obtained between 100 K and 600 K under zero and non-zero
electric field applied along the cubic [001] direction. The lowest energy,
zone-center, transverse optic phonon is strongly damped and softens slowly at
high temperature; however the square of the soft mode energy begins to increase
linearly with temperature as in a conventional ferroelectric, which we term the
soft mode "recovery," upon cooling into the tetragonal phase at TC. Our data
show that the soft mode in PMN-0.32PT behaves almost identically to that in
pure PMN, exhibiting the same temperature dependence and recovery temperature
even though PMN exhibits no well-defined structural transition (no TC). The
temperature dependence of the soft mode in PMN-0.32PT is also similar to that
in PMN-0.60PT; however in PMN-0.60PT the recovery temperature equals TC. These
results suggest that the temperature dependence and the energy scale of the
soft mode dynamics in PMN-xPT are independent of concentration on the Ti-poor
side of the MPB, but scale with TC for Ti-rich compositions. Thus the MPB may
be defined in lattice dynamical terms as the concentration where TC first
matches the recovery temperature of the soft mode. High-resolution x-ray
studies show that the cubic-to-ferroelectric phase boundary shifts to higher
temperatures by an abnormal amount within the MPB region in the presence of an
electric field. This suggests that an unusual instability exists within the
apparently cubic phase at the MPB.


title: The Ponzano-Regge asymptotic of the 6j symbol: an elementary proof

abstract:
  In this paper we give a direct proof of the Ponzano-Regge asymptotic formula
for the Wigner 6j symbol starting from Racah's single sum formula. Our method
treats halfinteger and integer spins on the same footing. The generalization to
Minkowskian tetrahedra is direct. This result should be relevant for the
introduction of renormalization scales in spin foam models.


title:
A Case of Subdominant/Suppressed "High Energy" Contribution to the
  Baryon Asymmetry of the Universe in Flavoured Leptogenesis

abstract:
  The CP-violation necessary for the generation of the baryon asymmetry of the
Universe $Y_B$ in the "flavoured" leptogenesis scenario can arise from the "low
energy" PMNS neutrino mixing matrix $U$ and/or from the "high energy" part of
neutrino Yukawa couplings, which can mediate CP-violating phenomena only at
some high energy scale. The possible interplay between these two types of
CP-violation is analysed. The type I see-saw model with three heavy
right-handed Majorana neutrinos having hierarchical spectrum is considered. We
show that in the case of inverted hierarchical light neutrino mass spectrum,
there exist regions in the corresponding leptogenesis parameter space where the
relevant "high energy" phases have large CP-violating values, but the purely
"high energy" contribution in $Y_B$ plays a subdominant role in the production
of baryon asymmetry compatible with the observations. In some of these regions
the purely "high energy" contribution in $Y_B$ is so strongly suppressed that
one can have successful leptogenesis only if the requisite CP-violation is
provided by the Majorana phase(s) in the neutrino mixing matrix.


title:
Data Diffusion: Dynamic Resource Provision and Data-Aware Scheduling for
  Data Intensive Applications

abstract:
  Data intensive applications often involve the analysis of large datasets that
require large amounts of compute and storage resources. While dedicated compute
and/or storage farms offer good task/data throughput, they suffer low resource
utilization problem under varying workloads conditions. If we instead move such
data to distributed computing resources, then we incur expensive data transfer
cost. In this paper, we propose a data diffusion approach that combines dynamic
resource provisioning, on-demand data replication and caching, and data
locality-aware scheduling to achieve improved resource efficiency under varying
workloads. We define an abstract "data diffusion model" that takes into
consideration the workload characteristics, data accessing cost, application
throughput and resource utilization; we validate the model using a real-world
large-scale astronomy application. Our results show that data diffusion can
increase the performance index by as much as 34X, and improve application
response time by over 506X, while achieving near-optimal throughputs and
execution times.


title:
Enabling Loosely-Coupled Serial Job Execution on the IBM BlueGene/P
  Supercomputer and the SiCortex SC5832

abstract:
  Our work addresses the enabling of the execution of highly parallel
computations composed of loosely coupled serial jobs with no modifications to
the respective applications, on large-scale systems. This approach allows
new-and potentially far larger-classes of application to leverage systems such
as the IBM Blue Gene/P supercomputer and similar emerging petascale
architectures. We present here the challenges of I/O performance encountered in
making this model practical, and show results using both micro-benchmarks and
real applications on two large-scale systems, the BG/P and the SiCortex SC5832.
Our preliminary benchmarks show that we can scale to 4096 processors on the
Blue Gene/P and 5832 processors on the SiCortex with high efficiency, and can
achieve thousands of tasks/sec sustained execution rates for parallel workloads
of ordinary serial applications. We measured applications from two domains,
economic energy modeling and molecular dynamics.


title:
State Preparation by Optical Pumping in Erbium Doped Solids using
  Stimulated Emission and Spin Mixing

abstract:
  Erbium doped solids are potential candidates for the realization of a quantum
memory for photons at telecommunication wavelengths. The implementation of
quantum memory proposals in rare earth ion doped solids require spectral
tailoring of the inhomogeneous absorption profile by efficient population
transfer between ground state levels (spin polarization) using optical pumping.
In this article we investigate the limiting factors of efficient optical
pumping between ground state Zeeman levels in an erbium doped Y2SiO5 crystal.
We introduce two methods to overcome these limiting factors: stimulated
emission using a second laser and spin mixing using radio frequency excitation.
Both methods significantly improve the degree of spin polarization. Population
transfer between two Zeeman levels with less than 10 % of the total population
in the initial ground state is achieved, corresponding to a spin polarization
greater than 90 %. In addition, we demonstrate spectral tailoring by isolating
a narrow absorption peak within a large transparency window.


title: Long-distance atom-photon entanglement

abstract:
  We report the observation of entanglement between a single trapped atom and a
single photon at remote locations. The degree of coherence of the entangled
atom-photon pair is verified via appropriate local correlation measurements,
after communicating the photon via an optical fiber link of 300 m length. In
addition we measured the temporal evolution of the atomic density matrix after
projecting the atom via a state measurement of the photon onto several well
defined spin states. We find that the state of the single atom dephases on a
timescale of 150 $\mu$s, which represents an important step toward
long-distance quantum networking with individual neutral atoms.


title: On the Thermodynamic Origin of the Quantum Potential

abstract:
  The quantum potential is shown to result from the presence of a subtle
thermal vacuum energy distributed across the whole domain of an experimental
setup. Explicitly, its form is demonstrated to be exactly identical to the heat
distribution derived from the defining equation for classical diffusion-wave
fields. For a single free particle path, this thermal energy does not
significantly affect particle motion. However, in between different paths, or
at interfaces, the accumulation-depletion law for diffusion waves provides an
immediate new understanding of the quantum potential's main features.


title: Towards Loosely-Coupled Programming on Petascale Systems

abstract:
  We have extended the Falkon lightweight task execution framework to make
loosely coupled programming on petascale systems a practical and useful
programming model. This work studies and measures the performance factors
involved in applying this approach to enable the use of petascale systems by a
broader user community, and with greater ease. Our work enables the execution
of highly parallel computations composed of loosely coupled serial jobs with no
modifications to the respective applications. This approach allows a new-and
potentially far larger-class of applications to leverage petascale systems,
such as the IBM Blue Gene/P supercomputer. We present the challenges of I/O
performance encountered in making this model practical, and show results using
both microbenchmarks and real applications from two domains: economic energy
modeling and molecular dynamics. Our benchmarks show that we can scale up to
160K processor-cores with high efficiency, and can achieve sustained execution
rates of thousands of tasks per second.


title: Dante, astrology and astronomy

abstract:
  Some verses of Dante Alighieri suggest his astrological sign and his probable
date of birth. This leads us to reflect on the different methods, increasingly
divergent, with which sciences as opposed to beliefs approach reality.


title:
Superconducting state of quasiparticles with spin dependent mass and
  their distinguishability for Cooper-pair state

abstract:
  Spin dependence of quasiparticle mass has been observed recently in CeCoIn5
and other systems. It emerges from strong electronic correlations in a
magnetically polarized state and was predicted earlier. Additionally, the
Fulde-Ferrell-Larkin-Ovchinnikov (FFLO)phase has also been discovered in
CeCoIn5 and therefore, the question arises as to what extent these two basic
phenomena are interconnected, as it appears in theory. Here we show that the
appearance of the spin-split masses essentially extends the regime of
temperature and applied magnetic field, in which FFLO state is stable, and
thus, it is claimed to be very important for the phase detectability.
Furthermore, in the situation when the value of the spin z-component \sigma
differentiates masses of the particles, the fundamental question is to what
extent the two mutually bound particles are indistinguishable quantum
mechanically? By considering first the Cooper-pair state we show explicitly
that the antisymmetry of the spin-pair wave function in the ground state may be
broken when the magnetic field is applied.


title:
Magnetic anisotropy and reversal in epitaxial Fe/MgO(001) films
  revisited

abstract:
  We investigate the magnetization reversal in Fe/MgO(001) films with fourfold
in-plane magnetic anisotropy and an additional uniaxial anisotropy whose
orientation and strength are tuned using different growth geometries and post
growth treatments. The previously adopted mechanism of 180^{o} domain wall
nucleation clearly fails to explain the observed 180^{o} magnetization
reversal. A new reversal mechanism with two successive domain wall nucleations
consistently predicts the switching fields for all field orientations. Our
results are relevant for a correct interpretation of magnetization reversal in
many other epitaxial metallic and semiconducting thin films.


title: The universal Kummer congruences

abstract:
  Let $p$ be a prime. In this paper, we present a detailed $p$-adic analysis to
factorials and double factorials and their congruences. We give good bounds for
the $p$-adic sizes of the coefficients of the divided universal Bernoulli
number ${{\hat B_n}\over n}$ when $n$ is divisible by $p-1$. Using these we
then establish the universal Kummer congruences modulo powers of a prime $p$
for the divided universal Bernoulli numbers ${{\hat B_n}\over n}$ when $n$ is
divisible by $p-1$.


title:
Scientific Workflow Systems for 21st Century e-Science, New Bottle or
  New Wine?

abstract:
  With the advances in e-Sciences and the growing complexity of scientific
analyses, more and more scientists and researchers are relying on workflow
systems for process coordination, derivation automation, provenance tracking,
and bookkeeping. While workflow systems have been in use for decades, it is
unclear whether scientific workflows can or even should build on existing
workflow technologies, or they require fundamentally new approaches. In this
paper, we analyze the status and challenges of scientific workflows,
investigate both existing technologies and emerging languages, platforms and
systems, and identify the key challenges that must be addressed by workflow
systems for e-science in the 21st century.


title: Accelerating Large-scale Data Exploration through Data Diffusion

abstract:
  Data-intensive applications often require exploratory analysis of large
datasets. If analysis is performed on distributed resources, data locality can
be crucial to high throughput and performance. We propose a "data diffusion"
approach that acquires compute and storage resources dynamically, replicates
data in response to demand, and schedules computations close to data. As demand
increases, more resources are acquired, thus allowing faster response to
subsequent requests that refer to the same data; when demand drops, resources
are released. This approach can provide the benefits of dedicated hardware
without the associated high costs, depending on workload and resource
characteristics. The approach is reminiscent of cooperative caching,
web-caching, and peer-to-peer storage systems, but addresses different
application demands. Other data-aware scheduling approaches assume dedicated
resources, which can be expensive and/or inefficient if load varies
significantly. To explore the feasibility of the data diffusion approach, we
have extended the Falkon resource provisioning and task scheduling system to
support data caching and data-aware scheduling. Performance results from both
micro-benchmarks and a large scale astronomy application demonstrate that our
approach improves performance relative to alternative approaches, as well as
provides improved scalability as aggregated I/O bandwidth scales linearly with
the number of data cache nodes.


title:
Applications of computational invariant theory to Kobayashi
  hyperbolicity and to Green-Griffiths algebraic degeneracy

abstract:
  A major unsolved problem (according to Demailly 1997) towards the Kobayashi
hyperbolicity conjecture in optimal degree is to understand jet differentials
of germs of holomorphic discs that are invariant under any reparametrization of
the source. The underlying group action is not reductive, but we provide a
complete algorithm to generate all invariants, in arbitrary dimension n and for
jets of arbitrary order k.
  Two main new situations are studied in great details. For jets of order 4 in
dimension 4, we establish that the algebra of Demailly-Semple invariants is
generated by 2835 polynomials, while the algebra of bi-invariants is generated
by 16 mutually independent polynomials sharing 41 groebnerized syzygies.
Nonconstant entire holomorphic curves valued in an algebraic 3-fold (resp.
4-fold) X^3 in P^4 (C) (resp. X^4 in P^5(C)) of degree d satisfy global
differential equations as soon as d > 71 (resp. d > 258). A useful asymptotic
formula for the Euler-Poincare characteristic of Schur bundles in terms of
Giambelli's determinants is derived.
  For jets of order 5 in dimension 2, we establish that the algebra of
Demailly-Semple invariants is generated by 56 polynomials, while the algebra of
bi-invariants is generated by 17 mutually independent polynomials sharing 105
groebnerized syzygies.


title:
Realizing Fast, Scalable and Reliable Scientific Computations in Grid
  Environments

abstract:
  The practical realization of managing and executing large scale scientific
computations efficiently and reliably is quite challenging. Scientific
computations often involve thousands or even millions of tasks operating on
large quantities of data, such data are often diversely structured and stored
in heterogeneous physical formats, and scientists must specify and run such
computations over extended periods on collections of compute, storage and
network resources that are heterogeneous, distributed and may change
constantly. We present the integration of several advanced systems: Swift,
Karajan, and Falkon, to address the challenges in running various large scale
scientific applications in Grid environments. Swift is a parallel programming
tool for rapid and reliable specification, execution, and management of
large-scale science and engineering workflows. Swift consists of a simple
scripting language called SwiftScript and a powerful runtime system that is
based on the CoG Karajan workflow engine and integrates the Falkon light-weight
task execution service that uses multi-level scheduling and a streamlined
dispatcher. We showcase the scalability, performance and reliability of the
integrated system using application examples drawn from astronomy, cognitive
neuroscience and molecular dynamics, which all comprise large number of
fine-grained jobs. We show that Swift is able to represent dynamic workflows
whose structures can only be determined during runtime and reduce largely the
code size of various workflow representations using SwiftScript; schedule the
execution of hundreds of thousands of parallel computations via the Karajan
engine; and achieve up to 90% reduction in execution time when compared to
traditional batch schedulers.


title: Some 6-dimensional Hamiltonian S^1 manifolds

abstract:
  In an earlier paper we explained how to convert the problem of symplectically
embedding one 4-dimensional ellipsoid into another into the problem of
embedding a certain set of disjoint balls into \CP^2 by using a new way to
desingularize orbifold blow ups Z of the weighted projective space
\CP^2_{1,m,n}. We now use a related method to construct symplectomorphisms of
these spaces Z. This allows us to construct some well known Fano 3-folds
(including the Mukai--Umemura 3-fold) in purely symplectic terms, using a
classification by Tolman of a particular class of Hamiltonian S^1-manifolds. We
also show that these manifolds are uniquely determined by their fixed point
data up to equivariant symplectomorphism. As part of this argument we show that
the symplectomorphism group of a certain weighted blow up of a weighted
projective plane is connected.


title: Infinite divisibility of Smith matrices

abstract:
  Given an arithmetical function $f$, by $f(a, b)$ and $f[a, b]$ we denote the
function $f$ evaluated at the greatest common divisor $(a, b)$ of positive
integers $a$ and $b$ and evaluated at the least common multiple $[a, b]$
respectively. A positive semi-definite matrix $A=(a_{ij})$ with $a_{ij}\ge 0$
for all $i$ and $j$ is called infinitely divisible if the fractional Hadamard
power $A^{\circ r}=(a_{ij}^r)$ is positive semi-definite for every nonnegative
real number $r$. Let $S=\{x_1, ..., x_n\}$ be a set of $n$ distinct positive
integers. In this paper, we show that if $f$ is a multiplicative function such
that $(f*\mu)(d)\ge 0$ whenever $d|x$ for any $x\in S$, then the $n\times n$
matrices $(f(x_i, x_j))$, $(\frac{1}{f[x_i, x_j]})$ and $(\frac{f(x_i,
x_j)}{f[x_i, x_j]})$ are infinitely divisible. Finally we extend these results
to the Dirichlet convolution case which produces infinitely many examples of
infinitely divisible matrices. Our results extend the results obtained
previously by Bourque, Ligh, Bhatia, Hong, Lee, Lindqvist and Seip.


title:
Charged Higgs bosons in Minimal Supersymmetry: Updated constraints and
  experimental prospects

abstract:
  We discuss the phenomenology of charged Higgs bosons in the MSSM with minimal
flavor violation. In addition to the constrained MSSM (CMSSM) with universal
soft supersymmetry breaking mass parameters at the GUT scale, we explore
non-universal Higgs mass models (NUHM) where this universality condition is
relaxed. To identify the allowed parameter space regions, we apply constraints
from direct searches, low energy observables, and cosmology. We find that
values of the charged Higgs mass as low as $m_{H^+}\simeq~135$ GeV can be
accommodated in the NUHM models, but that several flavor physics observables
disfavor large $H^+$ contributions, associated with high $\tan\beta$, quite
independently of MSSM scenario. We confront the constrained scenarios with the
discovery potentials reported by ATLAS and CMS, and find that the current
exclusion by indirect constraints is similar to the expected LHC discovery
reach with 30 fb$^{-1}$ of data. Finally, we evaluate the sensitivity of the
presented discovery potential to the choice of MSSM benchmark scenario. This
sensitivity is found to be higher in the case of a light ($m_{H^+}<m_t$)
charged Higgs.


title:
Dynamical thermalization and vortex formation in stirred 2D
  Bose-Einstein condensates

abstract:
  We present a quantum mechanical treatment of the mechanical stirring of
Bose-Einstein condensates using classical field techniques. In our approach the
condensate and excited modes are described using a Hamiltonian classical field
method in which the atom number and (rotating frame) energy are strictly
conserved. We simulate a T = 0 quasi-2D condensate perturbed by a rotating
anisotropic trapping potential. Vacuum fluctuations in the initial state
provide an irreducible mechanism for breaking the initial symmetries of the
condensate and seeding the subsequent dynamical instability. Highly turbulent
motion develops and we quantify the emergence of a rotating thermal component
that provides the dissipation necessary for the nucleation and motional-damping
of vortices in the condensate. Vortex lattice formation is not observed, rather
the vortices assemble into a spatially disordered vortex liquid state. We
discuss methods we have developed to identify the condensate in the presence of
an irregular distribution of vortices, determine the thermodynamic parameters
of the thermal component, and extract damping rates from the classical field
trajectories.


title: Graphene nanodevices: bridging nanoelectronics and subwavelength optics

abstract:
  The unconventional properties of graphene, with a massless Dirac band
dispersion and large coherence properties, have raised a large interest for
applications in nanoelectronics. In this work, we emphasize that graphene two
dimensional character combined with current standard lithography processes
allow to achieve devices smaller than the Dirac electrons wavelength. In this
regime, we demonstrate that the electronic properties present deep analogies
with subwavelength optics phenomena. We describe the rich transport physics in
graphene-based nanodevices through optical analogies: From the Bethe and
Kirchhoff-like diffraction patterns in the conductance of graphene slits to the
Fabry-Perot oscillations of the conductance in nanoribbons. We introduce the
concept of {\it electronic diffraction barriers}, which transmission cancels at
the Dirac point. This gives central insight in the properties of Graphene
subwavelength devices including nanoelectronics standard systems, such as
quantum dots. As an application we propose a new type of quantum dots, namely
functionalized subwavelength quantum dots, which could be used as molecular
spin valves.


title: LTB solutions in Newtonian gauge: from strong to weak fields

abstract:
  Lemaitre-Tolman-Bondi (LTB) solutions are used frequently to describe the
collapse or expansion of spherically symmetric inhomogeneous mass distributions
in the Universe. These exact solutions are obtained in the synchronous gauge
where nonlinear dynamics (with respect to the FLRW background) induce large
deviations from the FLRW metric. In this paper we show explicitly that this is
a gauge artefact (for realistic sub-horizon inhomogeneities). We write down the
nonlinear gauge transformation from synchronous to Newtonian gauge for a
general LTB solution using the fact that the peculiar velocities are small. In
the latter gauge we recover the solution in the form of a weakly perturbed FLRW
metric that is assumed in standard cosmology. Furthermore we show how to obtain
the LTB solutions directly in Newtonian gauge and illustrate how the Newtonian
approximation remains valid in the nonlinear regime where cosmological
perturbation theory breaks down. Finally we discuss the implications of our
results for the backreaction scenario.


title:
A Catastrophe-Theoretic Approach to Tricritical Points with Application
  to Liquid Crystals

abstract:
  A criterion to locate tricritical points in phase diagrams is proposed. The
criterion is formulated in the framework of the Elementary Catastrophe Theory
and encompasses all the existing criteria in that it applies to systems
described by a generally non symmetric free energy which can depend on one or
more order parameters. We show that a tricritical point is given whenever the
free energy is not 4-determined. An application to smectic-C liquid crystals is
briefly discussed.


title:
Dynamical mass of a star cluster in M83: a test of fibre-fed
  multi-object spectroscopy

abstract:
  (Abridged) Aims: We obtained VLT/FLAMES+UVES high-resolution, fibre-fed
spectroscopy (FFS) of five young massive clusters in M83 (NGC 5236). This forms
the basis of a pilot study testing the feasibility of using FFS to measure the
velocity dispersions of several clusters simultaneously, in order to determine
their dynamical masses; Methods: We adopted two methods for determining the
velocity dispersion of the star clusters: cross-correlating the cluster
spectrum with the template spectra and minimising a chi^2 value between the
cluster spectrum and the broadened template spectra. Cluster 805 in M83 was
chosen as a control to test the reliability of the method, through a comparison
with the results obtained from a standard echelle VLT/UVES spectrum obtained by
Larsen & Richtler; Results: We find no dependence of the velocity dispersions
measured for a cluster on the choice of red giant versus red supergiant
templates, nor on the method adopted. We measure a velocity dispersion of
sigma_los = 10.2+/-1.1 km/s for cluster 805 from our FFS. Our FLAMES+UVES
velocity dispersion measurement gives M_vir = (6.6+/-1.7)e5 M_sun, consistent
with previous results. This is a factor of ~3 greater than the cluster's
photometric mass, indicating a lack of virial equilibrium. However, based on
its effective star formation efficiency, the cluster is likely to virialise,
and may survive for a Hubble time, in the absence of external disruptive
forces; Conclusions: We find that reliable velocity dispersions can be
determined from FFS. The advantages of observing several clusters
simultaneously outweighs the difficulty of accurate galaxy background
subtraction, providing that the targets are chosen to provide sufficient S/N
ratios, and are much brighter than the galaxy background.


title:
High CO tolerance of Pt/Ru nano-catalyst: insight from first principles
  calculation

abstract:
  Density functional theory based calculations of the energetics of adsorption
and diffusion of CO on Pt islets and on the Ru(0001) substrate show that CO has
the lowest adsorption energy at the center of the islet, and its bonding
increases as it moves to the edge of the island and further onto the substrate.
Activation energy barriers for CO diffusion from the islet to the Ru surface
are found to be lower than 0.3 eV making the process feasible and leading to
the conclusion that this hydrogen oxidation catalyst is CO tolerant because of
the spillover of CO from active Pt sites to the Ru substrate. We present the
rationale for this effect using insights from detailed electronic structure
calculations.


title:
Market-Oriented Cloud Computing: Vision, Hype, and Reality for
  Delivering IT Services as Computing Utilities

abstract:
  This keynote paper: presents a 21st century vision of computing; identifies
various computing paradigms promising to deliver the vision of computing
utilities; defines Cloud computing and provides the architecture for creating
market-oriented Clouds by leveraging technologies such as VMs; provides
thoughts on market-based resource management strategies that encompass both
customer-driven service management and computational risk management to sustain
SLA-oriented resource allocation; presents some representative Cloud platforms
especially those developed in industries along with our current work towards
realising market-oriented resource allocation of Clouds by leveraging the 3rd
generation Aneka enterprise Grid technology; reveals our early thoughts on
interconnecting Clouds for dynamically creating an atmospheric computing
environment along with pointers to future community research; and concludes
with the need for convergence of competing IT paradigms for delivering our 21st
century vision.


title:
Basic parameters of three star clusters in the Small Magellanic Cloud:
  Kron 11, Kron 63 and NGC 121

abstract:
  We present observations for three star clusters, Kron 11, Kron 63 and NGC
121, in the Small Magellanic Cloud. We have studied their structure and derived
their fundamental parameters by means of their luminosity functions, their
color magnitude diagrams and the Padova suite of isochrones. NGC 121 is a well
studied object, for which we confirm previous evidence about its old age and
low metal content, and have found that it is undergoing mass segregation. Kron
11 and Kron 63 are poorly populated clusters which had never been studied so
far. Kron 11 is several gigayears younger than NGC 121, while Kron 63 is
basically a very young star aggregate. Both clusters are immersed in dense
stellar fields which share the same population properties, suggesting that in
their cases, cluster ages are consistent with typical ages of field stars.


title:
In search of RR Lyrae type stars in eclipsing binary systems.
  OGLE052218.07-692827.4: an optical blend

abstract:
  During the OGLE-2 operation, Soszynski et al. (2003) found 3 LMC candidates
for an RR Lyr-type component in an eclipsing binary system. Two of those have
orbital periods that are too short to be physically plausible and hence have to
be optical blends. For the third, OGLE052218.07-692827.4, we developed a model
of the binary that could host the observed RR Lyr star. After being granted
HST/WFPC2 time, however, we were able to resolve 5 distinct sources within a
1.3" region that is typical of OGLE resolution, proving that
OGLE052218.07-692827.4 is also an optical blend. Moreover, the putative
eclipsing binary signature found in the OGLE data does not seem to correspond
to a physically plausible system; the source is likely another background RR
Lyr star. There are still no RR Lyr stars discovered so far in an eclipsing
binary system.


title: Mapping the Asymmetric Thick Disk: The Hercules Thick Disk Cloud

abstract:
  The stellar asymmetry of faint thick disk/inner halo stars in the first
quadrant first reported by Larsen & Humphreys (1996) and investigated further
by Parker et al. (2003, 2004) has been recently confirmed by SDSS (Juric et al.
2008). Their interpretation of the excess in the star counts as a ringlike
structure, however, is not supported by critical complimentary data in the
fourth quadrant not covered by SDSS. We present stellar density maps from the
Minnesota Automated Plate Scanner (MAPS) Catalog of the POSS I showing that the
overdensity does not extend into the fourth quadrant. The overdensity is most
probably not a ring. It could be due to interaction with the disk bar, evidence
for a triaxial thick disk, or a merger remnant/stream. We call this feature the
Hercules Thick Disk Cloud.


title:
Minimal Agent Based Model for Financial Markets I: Origin and
  Self-Organization of Stylized Facts

abstract:
  We introduce a minimal Agent Based Model for financial markets to understand
the nature and Self-Organization of the Stylized Facts. The model is minimal in
the sense that we try to identify the essential ingredients to reproduce the
main most important deviations of price time series from a Random Walk
behavior. We focus on four essential ingredients: fundamentalist agents which
tend to stabilize the market; chartist agents which induce destabilization;
analysis of price behavior for the two strategies; herding behavior which
governs the possibility of changing strategy. Bubbles and crashes correspond to
situations dominated by chartists, while fundamentalists provide a long time
stability (on average). The Stylized Facts are shown to correspond to an
intermittent behavior which occurs only for a finite value of the number of
agents N. Therefore they correspond to finite size effect which, however, can
occur at different time scales. We propose a new mechanism for the
Self-Organization of this state which is linked to the existence of a threshold
for the agents to be active or not active. The feedback between price
fluctuations and number of active agents represent a crucial element for this
state of Self-Organized-Intermittency. The model can be easily generalized to
consider more realistic variants.


title: What It Feels Like To Hear Voices: Fond Memories of Julian Jaynes

abstract:
  Julian Jaynes's profound humanitarian convictions not only prevented him from
going to war, but would have prevented him from ever kicking a dog. Yet
according to his theory, not only are language-less dogs unconscious, but so
too were the speaking/hearing Greeks in the Bicameral Era, when they heard
gods' voices telling them what to do rather than thinking for themselves. I
argue that to be conscious is to be able to feel, and that all mammals (and
probably lower vertebrates and invertebrates too) feel, hence are conscious.
Julian Jaynes's brilliant analysis of our concepts of consciousness
nevertheless keeps inspiring ever more inquiry and insights into the age-old
mind/body problem and its relation to cognition and language.


title:
Storm fronts over galaxy discs: Models of how waves generate extraplanar
  gas and its anomalous kinematics

abstract:
  The existence of partially ionized, diffuse gas and dust clouds at kiloparsec
scale distances above the central planes of edge-on, galaxy discs was an
unexpected discovery about 20 yrs ago. Subsequent observations showed that this
EDIG (extended or extraplanar diffuse interstellar gas) has rotation velocities
approximately 10-20% lower than those in the central plane, and have been hard
to account for. Here we present results of hydrodynamic models, with radiative
cooling and heating from star formation. We find that in models with star
formation generated stochastically across the disc an extraplanar gas layer is
generated as long as the star formation is sufficiently strong. However, this
gas rotates at nearly the same speed as the mid-plane gas. We then studied a
range of models with imposed spiral or bar waves in the disc. EDIG layers were
also generated in these models, but primarily over the wave regions, not over
the entire disc. Because of this partial coverage, the EDIG clouds move
radially, as well as vertically, with the result that observed kinematic
anomalies are reproduced. The implication is that the kinematic anomalies are
the result of three-dimensional motions when the cylindrical symmetry of the
disc is broken. Thus, the kinematic anomalies are the result of bars or strong
waves, and more face-on galaxies with such waves should have an asymmetric EDIG
component. The models also indicate that the EDIG can contain a significant
fraction of cool gas, and that some star formation can be triggered at
considerable heights above the disc midplane. We expect all of these effects to
be more prominent in young, forming discs, to play a role in rapidly smoothing
disc asymmetries, and in working to self-regulate disc structure.


title:
Minimal Agent Based Model for Financial Markets II: Statistical
  Properties of the Linear and Multiplicative Dynamics

abstract:
  We present a detailed study of the statistical properties of an Agent Based
Model and of its generalization to the multiplicative dynamics. The aim of the
model is to consider the minimal elements for the understanding of the origin
of the Stylized Facts and their Self-Organization. The key elements are
fundamentalist agents, chartist agents, herding dynamics and price behavior.
The first two elements correspond to the competition between stability and
instability tendencies in the market. The herding behavior governs the
possibility of the agents to change strategy and it is a crucial element of
this class of models. The linear approximation permits a simple interpretation
of the model dynamics and, for many properties, it is possible to derive
analytical results. The generalized non linear dynamics results to be extremely
more sensible to the parameter space and much more difficult to analyze and
control. The main results for the nature and Self-Organization of the Stylized
Facts are, however, very similar in the two cases. The main peculiarity of the
non linear dynamics is an enhancement of the fluctuations and a more marked
evidence of the Stylized Facts. We will also discuss some modifications of the
model to introduce more realistic elements with respect to the real markets.


title:
How and why to think about scattering in terms of wave packets instead
  of plane waves

abstract:
  We discuss "the plane wave approximation" to quantum mechanical scattering
using simple one-dimensional examples. The central points of the paper are that
(a) plane waves should be thought of as infinitely wide wave packets, and (b)
the calculations of reflection and transmission probabilities $R$ and $T$ in
standard textbook presentations involve an approximation which is almost never
discussed. We argue that it should be discussed explicitly, and that doing so
provides a simple and intuitively revealing alternative way to derive and
understand certain formulas. Using an under-appreciated exact expression for
wave packet scattering probabilities, we calculate, for two standard examples,
expressions for $R$ and $T$ for an incident Gaussian wave packet. Comparing
these results to the corresponding ones calculated using the plane wave
approximation helps illuminate the domain of applicability of that
approximation.


title: Symmetric Spaces in Supergravity

abstract:
  We exploit the relation among irreducible Riemannian globally symmetric
spaces (IRGS) and supergravity theories in 3, 4 and 5 space-time dimensions.
IRGS appear as scalar manifolds of the theories, as well as moduli spaces of
the various classes of solutions to the classical extremal black hole Attractor
Equations. Relations with Jordan algebras of degree three and four are also
outlined.


title: NB BLG model in N=8 superfields

abstract:
  We develop the N=8 superfield description of the Bagger-Lambert-Gustavsson
(BLG) model in its Nambu bracket (NB) realization.
  The basic ingredient is the octet of scalar d=3 N=8 superfields depending
also on the coordinates of a compact three dimensional space M. It is
restricted by the 'superembedding-like' equation, which can be treated as
covariantization of the linearized superembedding equation for supermembrane
(M2-brane) with respect volume preserving diffeomorphisms SDiff3 of M. The
curvatures of SDiff3 connection are expressed through the scalar superfields by
the N=8 superfield generalization of the Chern-Simons equation (super-CS
equation). We show how the dynamical BLG equations appear when studying
consistency of these basic equations.


title: Offloading Cognition onto Cognitive Technology

abstract:
  "Cognizing" (e.g., thinking, understanding, and knowing) is a mental state.
Systems without mental states, such as cognitive technology, can sometimes
contribute to human cognition, but that does not make them cognizers. Cognizers
can offload some of their cognitive functions onto cognitive technology,
thereby extending their performance capacity beyond the limits of their own
brain power. Language itself is a form of cognitive technology that allows
cognizers to offload some of their cognitive functions onto the brains of other
cognizers. Language also extends cognizers' individual and joint performance
powers, distributing the load through interactive and collaborative cognition.
Reading, writing, print, telecommunications and computing further extend
cognizers' capacities. And now the web, with its network of cognizers, digital
databases and software agents, all accessible anytime, anywhere, has become our
'Cognitive Commons,' in which distributed cognizers and cognitive technology
can interoperate globally with a speed, scope and degree of interactivity
inconceivable through local individual cognition alone. And as with language,
the cognitive tool par excellence, such technological changes are not merely
instrumental and quantitative: they can have profound effects on how we think
and encode information, on how we communicate with one another, on our mental
states, and on our very nature.


title: Alg\`ebres enveloppantes \`a homotopie pr\`es, homologie et cohomologie

abstract:
  We present an unified construction for algebras and modules homologies and
cohomologies, in the case of associative, commuttaive, Lie and Gerstenhaber
algebras. We make a distinction between the linear part of the construction of
algebras and cogebras, characterized by the symmetries of the defining
relations and the structure itself which appears as a differential on these
algebras and cogebras.


title: MHS sunspot model from deep sub-photospheric to chromospheric layers

abstract:
  In order to understand the influence of magnetic fields on the propagation
properties of waves, as derived from different local helioseismology
techniques, forward modeling of waves is required. Such calculations need a
model in magnetohydrostatic equilibrium as initial atmosphere to propagate
oscillations through it. We provide a method to construct such a model in
equilibrium for a wide range of parameters to be used for simulations of
artificial helioseismologic data. The method combine the advantages of
self-similar solutions and current-distributed models. A set of models is
developed by numerical integration of magnetohydrostatic equations from the
sub-photospheric to chromospheric layers.


title: Model-Based Compressive Sensing

abstract:
  Compressive sensing (CS) is an alternative to Shannon/Nyquist sampling for
the acquisition of sparse or compressible signals that can be well approximated
by just K << N elements from an N-dimensional basis. Instead of taking periodic
samples, CS measures inner products with M < N random vectors and then recovers
the signal via a sparsity-seeking optimization or greedy algorithm. Standard CS
dictates that robust signal recovery is possible from M = O(K log(N/K))
measurements. It is possible to substantially decrease M without sacrificing
robustness by leveraging more realistic signal models that go beyond simple
sparsity and compressibility by including structural dependencies between the
values and locations of the signal coefficients. This paper introduces a
model-based CS theory that parallels the conventional theory and provides
concrete guidelines on how to create model-based recovery algorithms with
provable performance guarantees. A highlight is the introduction of a new class
of structured compressible signals along with a new sufficient condition for
robust structured compressible signal recovery that we dub the restricted
amplification property, which is the natural counterpart to the restricted
isometry property of conventional CS. Two examples integrate two relevant
signal models - wavelet trees and block sparsity - into two state-of-the-art CS
recovery algorithms and prove that they offer robust recovery from just M=O(K)
measurements. Extensive numerical simulations demonstrate the validity and
applicability of our new theory and algorithms.


title: Early-type galaxies in the near-infrared: 1.5-2.4\mum spectroscopy

abstract:
  Near-infrared (hereafter NIR) data may provide complementary information to
the traditional optical population synthesis analysis of unresolved stellar
populations because the spectral energy distribution of the galaxies in the
1-2.5\mum range is dominated by different types of stars than at optical
wavelengths. Furthermore, NIR data are subjected to less absorption and hence
could constrain the stellar populations in dust-obscured galaxies. We want to
develop observational constraints on the stellar populations of unresolved
stellar systems in the NIR. To achieve this goal we need a benchmark sample of
NIR spectra of ``simple'' early-type galaxies, to be used for testing and
calibrating the outputs of population synthesis models. We obtained
low-resolution (R~1000) long-slit spectra between 1.5 and 2.4\mum for 14 nearby
early-type galaxies using SofI at NTT and higher resolution (R~3000) long-slit
spectra, centered at the MgI at ~1.51\mum for a heterogeneous sample of 5
nearby galaxies observed with ISAAC at VLT. We defined spectral indices for CO,
NaI, CaI and MgI features and measured the strengths of these features in the
sample galaxies. We defined a new global NIR metallicity index, suitable for
abundance measurements in low-resolution spectra. Finally, we present an
average NIR spectrum of an early-type galaxy, built from a homogenized subset
of our sample. The NIR spectra of the sample galaxies show great similarity and
the strength of some features does correlate with the iron abundance [Fe/H] and
optical metal features of the galaxies. The data suggest that the NIR metal
features, in combination with a hydrogen absorption feature may be able to
break the age-metallicity degeneracy just like the Mg and Fe features in the
optical wavelength range.


title: Classical Knowledge for Quantum Security

abstract:
  We propose a decision procedure for analysing security of quantum
cryptographic protocols, combining a classical algebraic rewrite system for
knowledge with an operational semantics for quantum distributed computing. As a
test case, we use our procedure to reason about security properties of a
recently developed quantum secret sharing protocol that uses graph states. We
analyze three different scenarios based on the safety assumptions of the
classical and quantum channels and discover the path of an attack in the
presence of an adversary. The epistemic analysis that leads to this and similar
types of attacks is purely based on our classical notion of knowledge.


title:
Hamiltonian thermodynamics of charged three-dimensional dilatonic black
  holes

abstract:
  The action for a class of three-dimensional dilaton-gravity theories, with an
electromagnetic Maxwell field and a cosmological constant, can be recast in a
Brans-Dicke-Maxwell type action, with its free $\omega$ parameter. For a
negative cosmological constant, these theories have static, electrically
charged, and spherically symmetric black hole solutions. Those theories with
well formulated asymptotics are studied through a Hamiltonian formalism, and
their thermodynamical properties are found. The theories studied are general
relativity, a dimensionally reduced cylindrical four-dimensional general
relativity theory, and a theory representing a class of theories, all with a
Maxwell term. The Hamiltonian formalism is setup in three dimensions through
foliations on the right region of the Carter-Penrose diagram, with the
bifurcation 1-sphere as the left boundary, and anti-de Sitter infinity as the
right one. The metric functions on the hypersurfaces and the radial component
of the vector potential one-form are the canonical coordinates. The Hamiltonian
action is written, the Hamiltonian being a sum of constraints. One finds a new
action which yields an unconstrained theory with two pairs of canonical
coordinates ${M,P_M; Q,P_Q}$, where $M$ is the mass parameter, which needs
renormalization, $P_M$ its conjugate momenta, $Q$ is the charge parameter, and
$P_Q$ its conjugate momentum. The resulting Hamiltonian is a sum of boundary
terms only. A quantization of the theory is performed. The Schr\"odinger
evolution operator is constructed, the trace is taken, and the partition
function of the grand canonical ensemble is obtained, the chemical potential
being the electric potential. The charged black hole entropies differ, in
general, from the usual quarter of the horizon area due to the dilaton.


title:
Zero temperature phase diagram of a d-wave superconductor with Anderson
  impurities

abstract:
  We study the model of a d-wave superconductor interacting with finite
concentration of Anderson impurities at zero temperature. The interaction
between impurity and conduction electrons is taken into account within the
large-$N$ approximation. We discuss the obtained phase diagram and its
dependence on the main energy scales.


title: Singular reduction operators in two dimensions

abstract:
  The notion of singular reduction operators, i.e., of singular operators of
nonclassical (conditional) symmetry, of partial differential equations in two
independent variables is introduced. All possible reductions of these equations
to first-order ODEs are are exhaustively described. As examples, properties of
singular reduction operators of (1+1)-dimensional evolution and wave equations
are studied. It is shown how to favourably enhance the derivation of
nonclassical symmetries for this class by an in-depth prior study of the
corresponding singular vector fields.