title:
The Computation of All 4R Serial Spherical Wrists With an Isotropic
  Architecture

abstract:
  A spherical wrist of the serial type is said to be isotropic if it can attain
a posture whereby the singular values of its Jacobian matrix are all identical
and nonzero. What isotropy brings about is robustness to manufacturing,
assembly, and measurement errors, thereby guaranteeing a maximum orientation
accuracy. In this paper we investigate the existence of redundant isotropic
architectures, which should add to the dexterity of the wrist under design by
virtue of its extra degree of freedom. The problem formulation leads to a
system of eight quadratic equations with eight unknowns. The Bezout number of
this system is thus 2^8 = 256, its BKK bound being 192. However, the actual
number of solutions is shown to be 32. We list all solutions of the foregoing
algebraic problem. All these solutions are real, but distinct solutions do not
necessarily lead to distinct manipulators. Upon discarding those algebraic
solutions that yield no new wrists, we end up with exactly eight distinct
architectures, the eight corresponding manipulators being displayed at their
isotropic posture.


title:
Observation of inhomogeneous domain nucleation in epitaxial Pb(Zr,Ti)O3
  capacitors

abstract:
  We investigated domain nucleation process in epitaxial Pb(Zr,Ti)O3 capacitors
under a modified piezoresponse force microscope. We obtained domain evolution
images during polarization switching process and observed that domain
nucleation occurs at particular sites. This inhomogeneous nucleation process
should play an important role in an early stage of switching and under a high
electric field. We found that the number of nuclei is linearly proportional to
log(switching time), suggesting a broad distribution of activation energies for
nucleation. The nucleation sites for a positive bias differ from those for a
negative bias, indicating that most nucleation sites are located at
ferroelectric/electrode interfaces.


title:
Electronic structure of unidirectional superlattices in crossed electric
  and magnetic fields and related terahertz oscillations

abstract:
  We have studied Bloch electrons in a perfect unidirectional superlattice
subject to crossed electric and magnetic fields, where the magnetic field is
oriented ``in-plane'', i.e. in parallel to the sample plane. Two orientation of
the electric field are considered. It is shown that the magnetic field
suppresses the intersubband tunneling of the Zener type, but does not change
the frequency of Bloch oscillations, if the electric field is oriented
perpendicularly to both the sample plane and the magnetic field. The electric
field applied in-plane (but perpendicularly to the magnetic field) yields the
step-like electron energy spectrum, corresponding to the magnetic-field-tunable
oscillations alternative to the Bloch ones.


title: Paramagnetic to Superparamagnetic Transition in Ni(OH)_2 Nanoparticles

abstract:
  We report the temperature and field dependence of dc magnetization on sol-gel
prepared nanoparticles of Ni(OH)_2. At higher temperature the system is found
to behave as a paramagnet while we find evidence for superparamagnetic blocking
at low temperature. The system shows a paramagnet-superparamagnet transition
and we discuss the underlying mechanism.


title:
General Relativistic effects on the conversion of nuclear to two-flavour
  quark matter in compact stars

abstract:
  We investigate the General Relativistic (GR) effects on the conversion from
nuclear to two-flavour quark matter in compact stars, both static as well as
rotating. We find that GR effects lead to qualitative differences in rotating
stars, indicating the inadequacy of non-relativistic (NR) or even Special
Relativistic (SR) treatments for these cases.


title: Spin Networks and Anyonic Topological Computing II

abstract:
  We review the q-deformed spin network approach to topological quantum field
theory and apply these methods to produce unitary representations of the braid
groups that are dense in the unitary groups. The simplest case of these models
is the Fibonacci model, itself universal for quantum computation. We here
formulate these braid group representations in a shape suitable for computation
and algebraic work.


title:
Measurement of the radiative neutron capture cross section of 206Pb and
  its astrophysical implications

abstract:
  The (n, gamma) cross section of 206Pb has been measured at the CERN n_TOF
facility with high resolution in the energy range from 1 eV to 600 keV by using
two optimized C6D6 detectors. In the investigated energy interval about 130
resonances could be observed, from which 61 had enough statistics to be
reliably analyzed via the R-matrix analysis code SAMMY. Experimental
uncertainties were minimized, in particular with respect to (i) angular
distribution effects of the prompt capture gamma-rays, and to (ii) the
TOF-dependent background due to sample-scattered neutrons. Other background
components were addressed by background measurements with an enriched 208Pb
sample. The effect of the lower energy cutoff in the pulse height spectra of
the C6D6 detectors was carefully corrected via Monte Carlo simulations.
Compared to previous 206Pb values, the Maxwellian averaged capture cross
sections derived from these data are about 20% and 9% lower at thermal energies
of 5 keV and 30 keV, respectively. These new results have a direct impact on
the s-process abundance of 206Pb, which represents an important test for the
interpretation of the cosmic clock based on the decay of 238U.


title: Sub-Poissonian phononic population in a nanoelectromechanical system

abstract:
  Population of a phononic mode coupled to a single-electron transistor in the
sequential tunneling regime is discussed for the experimentally realistic case
of intermediate electron-phonon coupling. Features like a sub-Poissonian
bosonic distribution are found in regimes where electron transport drives the
oscillator strongly out of equilibrium with only few phonon states selectively
populated. The electron Fano factor is compared to fluctuations in the phonon
distribution, showing that all possible combinations of sub- and
super-Poissonian character can be realized.


title: On Consistency Of Noncommutative Chern-Simons Theory

abstract:
  We consider the noncommutative extension of Chern-Simons theory. We show the
the theory can be fully expanded in power series of the noncommutative
parameter theta and that no non-analytical sector exists. The theory appears to
be unstable under radiative corrections, but we show that the infinite set of
instabilities, to all orders in \hbar and in theta, is confined to a BRS exact
cocycle. We show also that the theory is anomaly free. The quantum theory
cannot be written in terms of the Groenewald-Moyal star product, and hence
doubts arise on the interpretation of the noncommutative nature of the
underlying spacetime. Nonetheless, the deformed theory is well defined as a
quantum field theory, and the beta function of the Chern-Simons coupling
constant vanishes, as in the ordinary Chern-Simons theory.


title: On the p-adic Beilinson conjecture for number fields

abstract:
  We formulate a conjectural p-adic analogue of Borel's theorem relating
regulators for higher K-groups of number fields to special values of the
corresponding zeta-functions, using syntomic regulators and p-adic L-functions.
We also formulate a corresponding conjecture for Artin motives, and state a
conjecture about the precise relation between the p-adic and classical
situations. Parts of he conjectures are proved when the number field (or Artin
motive) is Abelian over the rationals, and all conjectures are verified
numerically in some other cases.


title:
Theory of Ultrasonic Dispersion in Local Phonon Systems Coupled with
  Conduction Electrons

abstract:
  The physical origin of frequency dependence in elastic constants, which are
often found in an ultrasound propagation in filled skutterudites and clathrate
compounds, is investigated theoretically. This dependence arises from a
coupling between the acoustic phonon and some optical phonons, which strongly
interact with electrons. Using a self-consistent ladder approximation together
with a pseudofermion mapping of the phonon to the single site Holstein Anderson
model, a soft mode of the optical phonon at zero frequency is shown to emerge.
The temperature dependence of the spectral weight of this soft mode shows an
activation-type behavior, which is characterized by the optical phonon
frequency. These features can generate the frequency dependence and the
shoulder in the elastic constants observed in some filled skutterudites and
clathrate compounds.


title: Harmonic entanglement in a degenerate parametric down conversion

abstract:
  We study the harmonic entanglement and squeezing in a two-mode radiation
produced in a degenerate parametric down conversion process coupled to a
two-mode vacuum reservoir employing the linearization procedure. It is found
that there is a quadrature entanglement between the harmonically related
fundamental and second-harmonic modes and the superimposed radiation exhibits a
significant two-mode squeezing. The entanglement exits even when there is no
two-mode squeezing, since the correlation leading to these phenomena are
essentially different. In addition, the more the external coherent light is
down converted, the more stronger the entanglement and mean photon number of
the two-mode radiation would be which is not generally true for squeezing.


title: Pilot-wave theory and quantum fields

abstract:
  Pilot-wave theories provide possible solutions to the measurement problem. In
such theories, quantum systems are not only described by the state vector, but
also by some additional variables. These additional variables, also called
beables, can be particle positions, field configurations, strings, etc. In this
paper we focus our attention on pilot-wave theories in which the additional
variables are field configurations. The first such theory was proposed by Bohm
for the free electromagnetic field. Since Bohm, similar pilot-wave theories
have been proposed for other quantum fields. The purpose of this paper is to
present an overview and further development of these proposals. We discuss
various bosonic quantum field theories such as the Schroedinger field, the free
electromagnetic field, scalar quantum electrodynamics and the Abelian Higgs
model. In particular, we compare the pilot-wave theories proposed by Bohm and
by Valentini for the electromagnetic field, finding that they are equivalent.
We further discuss the proposals for fermionic fields by Holland and Valentini.
In the case of Holland's model we indicate that further work is required in
order to show that the model is capable of reproducing the standard quantum
predictions. We also consider a similar model, which does not seem to reproduce
the standard quantum predictions. In the case of Valentini's model we point out
a problem that seems hard to overcome.


title: Quantum optics of spatial transformation media

abstract:
  Transformation media are at the heart of invisibility devices, perfect lenses
and artificial black holes. In this paper, we consider their quantum theory. We
show how transformation media map quantum electromagnetism in physical space to
QED in empty flat space.


title:
$S_t^1\times S_s^1$-valued lightcone Gauss map of a Lorentzian surface
  in semi-Euclidean 4-space

abstract:
  We define the notions of $S_t^1\times S_s^1$-valued lightcone Gauss maps,
lightcone pedal surface and Lorentzian lightcone height function of Lorentzian
surface in semi-Euclidean 4-space and established the relationships between
singularities of these objects and geometric invariants of the surface as
applications of standard techniques of singularity theory for the Lorentzian
lightcone height function.


title:
Combined fixed-order and effective-theory approach to $b \bar{b}$ sum
  rules

abstract:
  We combine the fixed-order evaluation of the $b\bar{b}$ sum rules with a
non-relativistic effective-theory approach. The combined result for the $n$-th
moment includes all terms suppressed with respect to the leading-order result
by ${\cal O}(\alpha_s^3)$ and ${\cal O}((\alpha_s \sqrt{n})^l \alpha_s^2)$,
counting $\alpha_s \sqrt{n} \sim 1$. When compared to experimental data, the
moments thus obtained show a remarkable consistency and allow for an analysis
in the whole range $1\le n\lesssim 16$.


title:
Parametrizations of triaxial deformation and E2 transitions of the
  wobbling band

abstract:
  By the very definition the triaxial deformation parameter $\gamma$ is related
to the expectation values of the K=0 and K=2 components of the intrinsic
quadrupole tensor operator. On the other hand, using the same symbol
"$\gamma$", various different parametrizations of triaxial deformation have
been employed, which are suitable for various types of the mean-field
potentials. It is pointed out that the values of various "$\gamma$" are quite
different for the same actual triaxial deformation, especially for the large
deformation; for example, the difference can be almost a factor two for the
case of the triaxial superdeformed bands recently observed in the Hf and Lu
nuclei. In our previous work, we have studied the wobbling band in Lu nuclei by
using the microscopic framework of the cranked Nilsson mean-field and the
random phase approximation, where the most serious problem is that the
calculated B(E2) value is about factor two smaller. It is shown that the origin
of this underestimation can be mainly attributed to the small triaxial
deformation; if is used the same triaxial deformation as in the analysis of the
particle-rotor model, the calculated B(E2) increases and gives correct
magnitude compared with the experimental data.


title: Virus Structure: From Crick and Watson to a New Conjecture

abstract:
  We conjecture that certain patterns (scars), theoretically and numerically
predicted to be formed by electrons arranged on a sphere to minimize the
repulsive Coulomb potential (the Thomson problem) and experimentally found in
spherical crystals formed by self-assembled polystyrene beads (an instance of
the generalized Thomson problem), could be relevant to extend the classic
Caspar and Klug construction for icosahedrally-shaped virus capsids. The main
idea is that scars could be produced at an intermediate stage of the assembly
of the virus capsids and the release of the bending energy present in scars
into stretching energy could allow for a variety of non-spherical capsids'
shapes. The conjecture can be tested in experiments on the assembly of
artificial protein-cages where these scars should appear.

categories: q-bio.QM cond-mat.mtrl-sci cond-mat.soft math-ph math.MP


title:
Strong first-order phase transition in a rotating neutron star core and
  the associated energy release

abstract:
  We calculate the energy release associated with a strong first-order phase
transition, from normal phase N to an "exotic" superdense phase S, in a
rotating neutron star. Such a phase transition, accompanied by a density jump
rho_N --> rho_S, is characterized by rho_S/rho_N > 3/2(1+P_0/rho_N c^2), where
P_0 is the pressure, at which phase transition occurs. Configurations with
small S-phase cores are then unstable and collapse into stars with large
S-phase cores. The energy release is equal to the difference in mass-energies
between the initial (normal) configuration and the final configuration
containing an S-phase core, total stellar baryon mass and angular momentum
being kept constant. The calculations of the energy release are based on
precise numerical 2-D calculations. Polytropic equations of state (EOSs) as
well as realistic EOS with strong first-order phase transition due to kaon
condensation are used. For polytropic EOSs, a large parameter space is studied.
For a fixed "overpressure", dP, defined as the relative excess of central
pressure of collapsing metastable star over the pressure of equilibrium
first-order phase transition, the energy release E_rel does not depend on the
stellar angular momentum. It coincides with that for nonrotating stars with the
same dP. Therefore, results of 1-D calculations of E_rel(dP) for non-rotating
stars can be used to predict, with very high precision, the outcome of much
harder to perform 2-D calculations for rotating stars with the same dP. This
result holds also for dP_min < dP < 0, corresponding to phase transitions with
climbing over the energy barrier separating metastable N-phase configurations
from those with an S-phase core. Such phase transitions could be realized in
the cores of newly born, hot, pulsating neutron stars.


title:
Electron magnetotransport in GaAs/AlGaAs superlattices with weak and
  strong inter-well coupling

abstract:
  We report on magnetotransport measurements in two MBE-grown GaAs/AlGaAs
superlattices formed by wide and narrow quantum wells and thin Si-doped
barriers subject to tilted magnetic fields. It has been shown that illumination
of the strongly coupled superlattice with narrow wells leads to reduction of
its dimensionality from the 3D to 2D. The illumination-induced transition is
revealed by remarkable change of magnetoresistance curves as compared to those
measured before illumination. The experimental data along with tight-binding
model calculations indicate that the illumination not only enhances the
electron concentration but also suppresses the electron tunneling through the
barriers.


title: Thermodynamic model of interaction of small ligands with DNA

abstract:
  We have managed to correlate the stability constants of complex formation,
which can be registered in equilibrium state, to the dynamic characteristic of
the complex lifetime. Thus, the principal concept of molecular biophysics
regarding biomolecule, structure-dynamics-function can be reformatted as
structure-stability-function. It should be specially noted that such an
approach highly simplifies end widens the time interval of investigation of
dynamic characteristics of macromolecules.
  Study of hydration energy and hydration number by kinetic curves of water
desorption from Na-DNA humidified fibers by glow discharge atomic spectral
analysis of hydrogen allowed us to reveal that after transition of DNA from B
form to unordered state the activation energy of hydrated water desorption
increases by 0.65kcal/Mole of water. This increase of energy is 0.1 kcal/Mole
for transition from B to C form (from 20 to 10 water molecules per nucleotide)
and 0.55 kcal/Mole for the one from C form to A unordered state (from 10 to 5
molecules per nucleotide).
  Simultaneous use of UDS and AES allows identifying the number of Wrong
Watson-Crick pairs in DNA. The quantitative analysis is based on increase of
informativity of UDS via its combination with atomic-emission spectroscopy. The
number of the total metal-induced tautomerization makes six hundred per million
base pairs of DNA. Such approach enables estimation of risk factors during
clinical check-ups and evaluation of DNA suitability for nanotechnological
purposes.


title: On singular Calogero-Moser spaces

abstract:
  Using combinatorial properties of complex reflection groups, we show that the
generalised Calogero-Moser space associated to the centre of the corresponding
rational Cherednik algebra is singular for all values of its deformation
parameter c if and only if the group is different from the wreath product
$S_n\wr C_m$ and the binary tetrahedral group. This result and a theorem of
Ginzburg and Kaledin imply that there does not exist a symplectic resolution of
the singular symplectic variety h+h*/W outside of these cases; conversely we
show that there exists a symplectic resolution for the binary tetrahedral group
(Hilbert schemes provide resolutions for the wreath product case).


title: Weak values of electron spin in a double quantum dot

abstract:
  We propose a protocol for a controlled experiment to measure a weak value of
the electron's spin in a solid state device. The weak value is obtained by a
two step procedure -- weak measurement followed by a strong one
(post-selection), where the outcome of the first measurement is kept provided a
second post-selected outcome occurs. The set-up consists of a double quantum
dot and a weakly coupled quantum point contact to be used as a detector.
Anomalously large values of the spin of a two electron system are predicted, as
well as negative values of the total spin. We also show how to incorporate the
adverse effect of decoherence into this procedure.


title:
Towards journalometrical analysis of a scientific periodical: a case
  study

abstract:
  In this paper we use several approaches to analyse a scientific journal as a
complex system and to make a possibly more complete description of its current
state and evolution. Methods of complex networks theory, statistics, and
queueing theory are used in this study. As a subject of the analysis we have
chosen the journal ``Condensed Matter Physics''
(http://www.icmp.lviv.ua/journal/). In particular, based on the statistical
data regarding the papers published in this journal since its foundation in
1993 up to now we have composed the co-authorship network and extracted its
main quantitative characteristics. Further, we analyse the priorities of
scientific trends reflected in the journal and its impact on the publications
in other editions (the citation ratings). Moreover, to characterize an
efficiency of the paper processing, we study the time dynamics of editorial
processing in terms of queueing theory and human activity analysis.


title: Chromoelectric response functions for quark-gluon plasma

abstract:
  We determine the chromoelectric response of quark-gluon plasma (QGP)
systematically within the framework of classical transport equations. The
transport equations are set up in the phase space which includes the SU(3)
group space corresponding to color (which is a dynamical degree of freedom), in
addition to the position - momentum variables. The distribution functions are
defined by projecting the density operators for the quarks and the gluons to
their respective coherent states (defined over the extended phase space). The
full import of the Yang-Mills(YM) dynamics is shown to manifest through the
emergence of an intrinsic nonlinear, nonlocal response, whose behavior we
determine in the long wavelength limit. It also manifests as a tensor response
which is a characteristic of gluons. The response functions are shown to have a
natural interpretation in terms of the renormalizations of the Abelian and the
non-Abelian coupling constants. A detailed analysis of the screening of heavy
quark potential and of the exact role played by the Debye mass screening in the
case of the Cornell potential, is performed. We also discuss the non-Abelian
contribution to Landau damping in QGP.


title: Angular momentum exchange between coherent light and matter fields

abstract:
  Full, three dimensional, time-dependent simulations are presented
demonstrating the quantized transfer of angular momentum to a Bose-Einstein
condensate from a laser carrying orbital angular momentum in a
Laguerre-Gaussian mode. The process is described in terms of coherent Bragg
scattering of atoms from a chiral optical lattice. The transfer efficiency and
the angular momentum content of the output coupled vortex state are analyzed
and compared with a recent experiment.


title:
Observation of Two Resonant Structures in e+e- to pi+ pi- psi(2S) via
  Initial State Radiation at Belle

abstract:
  The cross section for e+e- to pi+ pi- psi(2S) between threshold and
\sqrt{s}=5.5 GeV is measured using 673 fb^{-1} of data on and off the
\Upsilon(4S) resonance collected with the Belle detector at KEKB. Two resonant
structures are observed in the pi+ pi- psi(2S) invariant mass distribution, one
at 4361\pm 9\pm 9 MeV/c2 with a width of 74\pm 15\pm 10 MeV/c2, and another at
4664\pm 11\pm 5 MeV/c2 with a width of 48\pm 15\pm 3 MeV/c2, if the mass
spectrum is parameterized with the coherent sum of two Breit-Wigner functions.
These values do not match those of any of the known charmonium states.


title:
Undeformed (additive) energy conservation law in Doubly Special
  Relativity

abstract:
  All the Doubly Special Relativity (DSR) models studied in literature so far
involve a deformation of the energy conservation rule that forces us to release
the hypothesis of the additivity of the energy for composite systems. In view
of the importance of the issue for a consistent formulation of a DSR
statistical mechanics and a DSR thermodynamics, we show that DSR models
preserving the usual (i.e. additive) energy conservation rule can be found.
These models allow the construction of a DSR-covariant extensive energy. The
implications of the analysis for the dynamics of DSR-covariant multiparticle
systems are also briefly discussed.


title:
Nanospintronics meets relativistic quantum physics: Ubiquity of
  Zitterbewegung effects

abstract:
  We present a unified description of zitterbewegung-like phenomena for
electron and hole systems showing Rashba spin splitting as well as for
electrons in single-layer and bilayer graphene. The former class of systems can
be interpreted as "nonrelativistic" whereas the latter are often called
"ultrarelativistic" so that our unified description indicates an interesting
connection between these two opposite limits.


title: Calculating the Superconformal Index and Seiberg Duality

abstract:
  We develop techniques to calculate an index for four dimensional
superconformal field theories. This superconformal index is counting BPS
operators which preserve only one supercharge. To calculate the superconformal
index we quantize the field theory on S^3 X R and show that the twisted theory
has an appropriate mass gap. This allows for the interactions to be switched
off continuously without the superconformal index being changed. We test those
techniques for theories which go through a non-trivial RG flow and for Seiberg
dual theories. This leads to the conjecture of some group/number theoretical
identities.


title: Economic Amplifier - A New Econophysics Model

abstract:
  Most of the econometric and econophysics models have been borrowed from the
statistical physics, and as a cosequence, a new interdisciplinary science
called econophysics has emerged. In this paper we planned to extend the analogy
between different economic processes or phenomena and processes and phenomena
from different fields of physics, other than statistical physics. On the basis
of the economic development process and amplification phenomenon analogy, a new
econophysics model, named economic amplifier, on the electronic amplification
principle from applied physics was proposed und largely analyzed.


title: A Cartan-Eilenberg approach to Homotopical Algebra

abstract:
  In this paper we propose an approach to homotopical algebra where the basic
ingredient is a category with two classes of distinguished morphisms: strong
and weak equivalences. These data determine the cofibrant objects by an
extension property analogous to the classical lifting property of projective
modules. We define a Cartan-Eilenberg category as a category with strong and
weak equivalences such that there is an equivalence between its localization
with respect to weak equivalences and the localised category of cofibrant
objets with respect to strong equivalences. This equivalence allows us to
extend the classical theory of derived additive functors to this non additive
setting. The main examples include Quillen model categories and functor
categories with a triple, in the last case we find examples in which the class
of strong equivalences is not determined by a homotopy relation. Among other
applications, we prove the existence of filtered minimal models for \emph{cdg}
algebras over a zero-characteristic field and we formulate an acyclic models
theorem for non additive functors.


title:
Spin projected unrestricted Hartree-Fock ground states for harmonic
  quantum dots

abstract:
  We report results for the ground state energies and wave functions obtained
by projecting spatially unrestricted Hartree Fock states to eigenstates of the
total spin and the angular momentum for harmonic quantum dots with $N\leq 12$
interacting electrons including a magnetic field states with the correct
spatial and spin symmetries have lower energies than those obtained by the
unrestricted method. The chemical potential as a function of a perpendicular
magnetic field is obtained. Signature of an intrinsic spin blockade effect is
found.


title: QCD analysis of diffractive phenomena

abstract:
  The most important results on subnuclear diffractive phenomena obtained at
HERA and Tevtaron are reviewed and new issues in nucleon tomography are
discussed. Some challenges for understanding diffraction at the LHC, including
the discovering of the Higgs boson, are outlined.


title: Storing images in warm atomic vapor

abstract:
  Reversible and coherent storage of light in atomic medium is a key-stone of
future quantum information applications. In this work, arbitrary
two-dimensional images are slowed and stored in warm atomic vapor for up to 30
$\mu$s, utilizing electromagnetically induced transparency. Both the intensity
and the phase patterns of the optical field are maintained. The main limitation
on the storage resolution and duration is found to be the diffusion of atoms. A
techniqueanalogous to phase-shift lithography is employed to diminish the
effect of diffusion on the visibility of the reconstructed image.


title: An Interesting Class of Partial Differential Equations

abstract:
  This paper presents an observation that under reasonable conditions, many
partial differential equations from mathematical physics possess three
structural properties. One of them can be understand as a variant of the
celebrated Onsager reciprocal relation in Modern Thermodynamics. It displays a
direct relation of irreversible processes to the entropy change. We show that
the properties imply various entropy dissipation conditions for hyperbolic
relaxation problems. As an application of the observation, we propose an
approximation method to solve relaxation problems. Moreover, the observation is
interpreted physically and verified with eight (sets of) systems from different
fields.


title: Inhomogeneous states and nodal fermions in the SU(2) gauge theory

abstract:
  We discuss the issue of phase separation in the SU(2) slave boson theory of
Wen and Lee of the doped Mott insulator. It is shown that the constraint
structure of the theory leads to the interpretation of the holons to have
hard-core interactions, which is demonstrated further by studying the empty
limit (no electrons). Surprisingly, with hard-core interactions even the empty
limit is described well by the slave-boson theory, both as an energy density
and with the regard to dynamical properties. The consequences are investigated
in the overdoped superconducting regime, where both phase separation and a d+s
structure of the order parameter is obtained. This s-wave component is already
imminent in the description of the hole in the slave boson theory. The
interacting nature of the holons also lead to sound modes in the
single-electron propagator. The novel idea of the isospin spiral is introduced,
based on the projective symmetry principles of Wen. This isospin spiral
explains the coexistence of superconductivity and the Mott insulating state,
being the consequence of phase separation. Secondly, it might be able to
explain why nodal fermions survive in the presence of charge inhomogeneities.


title: Casimir Effect for Quantum Graphs

abstract:
  The Casimir effects for one-dimensional fractal networks, so-called quantum
graphs is studied. Based on the Green function approach for quantum graphs
zero-point energy for some simplest topologies is written explicitly.


title: Elliptic Gauss Sums and Hecke L-values at s=1

abstract:
  The rationality of the elliptic Gauss sum coefficient is shown. The following
is a specific case of our argument.
  Let f(u)=sl((1-i)\varpi u), where sl() is the Gauss' lemniscatic sine and
\varpi=2.62205... is the real period of the elliptic curve y^2=x^3-x, so that
f(u) is an elliptic function relative to the period lattice Z[i].
  Let \pi be a primary prime of Z[i] such that norm(\pi)\equiv 13\mod 16. Let S
be the quarter set mod \pi consisting of quartic residues.
  Let us define G(\pi):=\sum_{\nu\in S} f(\nu/\pi) and
\tilde{\pi}:=\prod_{\nu\in S} f(\nu/\pi).
  The former G(\pi) is a typical example of elliptic Gauss sum; the latter is
regarded as a canonical 4-th root of -\pi: (\tilde{\pi})^4=-\pi. Then we have
  Theorem: G(\pi)/(\tilde{\pi})^3 is a rational odd integer.
  G(\pi) appears naturally in the central value of Hecke L associated to the
quartic residue character mod \pi, and our proof is based on the functional
equation of L and an explicit formula of the root number. In fact, the latter
is nothing but the Cassels-Matthews formula on the quartic Gauss sum.


title: Higgs phenomenology of supersymmetric economical 3-3-1 model

abstract:
  We explore the Higgs sector in the supersymmetric economical 3-3-1 model and
find new features in this sector. The charged Higgs sector is revised i.e., in
difference of the previous work, the exact eigenvalues and states are obtained
without any approximation. In this model, there are three Higgs bosons having
masses equal to that of the gauge bosons--the W and extra X and Y. There is one
scalar boson with mass of 91.4 GeV, which is closed to the $Z$ boson mass and
in good agreement with present limit: 89.8 GeV at 95% CL. The condition of
eliminating for charged scalar tachyon leads to splitting of VEV at the first
symmetry breaking, namely, $w \simeq w^\prime$. The interactions among the
standard model gauge bosons and scalar fields in the framework of the
supersymmetric economical 3-3-1 model are presented. From these couplings, at
some limit, almost scalar Higgs fields can be recognized in accordance with the
standard model. The hadronic cross section for production of the bilepton
charged Higgs boson at the CERN LHC in the effective vector boson approximation
is calculated. Numerical evaluation shows that the cross section can exceed
35.8 fb.


title:
Novel ordering of an S = 1/2 quasi one-dimensional Ising-like
  anitiferromagnet in magnetic field

abstract:
  High-field specific heat measurements on BaCo2V2O8, which is a good
realization of an S = 1/2 quasi one-dimensional Ising-like antifferomagnet,
have been performed in magnetic fields up to 12 T along the chain and at
temperature down to 200 mK. We have found a new magnetic ordered state in the
field-induced phase above Hc ~ 3.9 T. We suggest that a novel type of the
incommensurate order, which has no correspondence to the classical spin system,
is realized in the field-induced phase.


title:
Nonequilibrium Statistical Mechanics and Hydrodynamics for a Granular
  Fluid

abstract:
  Granular fluids consist of collections of activated mesoscopic or macroscopic
particles (e.g., powders or grains) whose flows often appear similar to those
of normal fluids. To explore the qualitative and quantitative description of
these flows an idealized model for such fluids, a system of smooth inelastic
hard spheres, is considered. The single feature distinguishing granular and
normal fluids being explored in this way is the inelasticity of collisions. The
dominant differences observed in real granular fluids are indeed captured by
this feature. Following a brief introductory description of real granular
fluids and motivation for the idealized model, the elements of nonequilibrium
statistical mechanics are recalled (observables, states, and their dynamics).
Peculiarities of the hard sphere interactions are developed in detail. The
exact microscopic balance equations for the number, energy, and momentum
densities are derived and their averages described as the origin for a possible
macroscopic continuum mechanics description. This formally exact analysis leads
to closed, macroscopic hydrodynamic equations through the notion of a "normal"
state. This concept is introduced and the Navier-Stokes constitutive equations
are derived, with associated Green-Kubo expressions for the transport
coefficients. A parallel description of granular gases is described in the
context of kinetic theory, and the Boltzmann limit is identified critically.
The construction of the "normal" solution to the kinetic equation is outlined,
and Navier-Stokes order hydrodynamic equations are re-derived for a low density
granular gas.


title:
Exponential inequalities for self-normalized martingales with
  applications

abstract:
  We propose several exponential inequalities for self-normalized martingales
similar to those established by De la Pe\~{n}a. The keystone is the
introduction of a new notion of random variable heavy on left or right.
Applications associated with linear regressions, autoregressive and branching
processes are also provided.


title:
Post-transcriptional Regulation Drives Temporal Compartmentalization of
  the Yeast Metabolic Cycle

abstract:
  The maintainance of a stable periodicity during the yeast metabolic cycle
involving approximately half of the genome requires a very strict and efficient
control of gene expression. For this reason, the metabolic cycle is a very good
candidate for testing the role of a class of post-transcriptional regulators,
the so called PUF-family, whose genome-wide mRNA binding specificity was
recently experimentally assessed. Here we show that an integrated computational
analysis of gene expression time series during the metabolic cycle and the mRNA
binding specificity of PUF-family proteins allow for a clear demonstration of
the very specific role exerted by selective post-transcriptional mRNA
degradation in yeast metabolic cycle global regulation.


title:
GCP: Gossip-based Code Propagation for Large-scale Mobile Wireless
  Sensor Networks

abstract:
  Wireless sensor networks (WSN) have recently received an increasing interest.
They are now expected to be deployed for long periods of time, thus requiring
software updates. Updating the software code automatically on a huge number of
sensors is a tremendous task, as ''by hand'' updates can obviously not be
considered, especially when all participating sensors are embedded on mobile
entities. In this paper, we investigate an approach to automatically update
software in mobile sensor-based application when no localization mechanism is
available. We leverage the peer-to-peer cooperation paradigm to achieve a good
trade-off between reliability and scalability of code propagation. More
specifically, we present the design and evaluation of GCP ({\emph Gossip-based
Code Propagation}), a distributed software update algorithm for mobile wireless
sensor networks. GCP relies on two different mechanisms (piggy-backing and
forwarding control) to improve significantly the load balance without
sacrificing on the propagation speed. We compare GCP against traditional
dissemination approaches. Simulation results based on both synthetic and
realistic workloads show that GCP achieves a good convergence speed while
balancing the load evenly between sensors.


title: Seesaw mechanism in the sneutrino sector and its consequences

abstract:
  The seesaw-extended MSSM provides a framework in which the observed light
neutrino masses and mixing angles can be generated in the context of a natural
theory for the TeV-scale. Sneutrino-mixing phenomena provide valuable tools for
connecting the physics of neutrinos and supersymmetry. We examine the
theoretical structure of the seesaw-extended MSSM, retaining the full
complexity of three generations of neutrinos and sneutrinos. In this general
framework, new flavor-changing and CP-violating sneutrino processes are
allowed, and are parameterized in terms of two $3\times 3$ matrices that
respectively preserve and violate lepton number. The elements of these matrices
can be bounded by analyzing the rate for rare flavor-changing decays of charged
leptons and the one-loop contribution to neutrino masses. In the former case,
new contributions arise in the seesaw extended model which are not present in
the ordinary MSSM. In the latter case, sneutrino--antisneutrino mixing
generates the leading correction at one-loop to neutrino masses, and could
provide the origin of the observed texture of the light neutrino mass matrix.
Finally, we derive general formulae for sneutrino--antisneutrino oscillations
and sneutrino flavor-oscillations. Unfortunately, neither oscillation phenomena
is likely to be observable at future colliders.


title: Funnels in Energy Landscapes

abstract:
  Local minima and the saddle points separating them in the energy landscape
are known to dominate the dynamics of biopolymer folding. Here we introduce a
notion of a "folding funnel" that is concisely defined in terms of energy
minima and saddle points, while at the same time conforming to a notion of a
"folding funnel" as it is discussed in the protein folding literature.


title: Wounded quarks and diquarks in high energy collisions

abstract:
  Particle production in Au-Au, Cu-Cu, d-Au and p-p collisions at 200 GeV c.m.
energy are analyzed in the wounded quark-diquark model. Existing data are well
reproduced. Emission functions of wounded and unwounded constituents are
determined. Implications for the collective evolution of the system are
discussed.


title: A class of generalised Jordan-Schwinger maps

abstract:
  In this article we introduce a class of generalisations of the
Jordan-Schwinger (JS) map which realises the recent proposed generalised sl(2)
(G-sl(2)) algebra via two independent Generalised Heisenberg Algebras (GHA).
Although the GHA and the G-sl(2) algebra exhibit more general algebraic
structures than the Heisenberg and sl(2) algebras, the generalised JS map
presents a compact and simple structure wich includes the standard JS map as a
particular case. Finally, since in the GHA there is a physical interpretation
in terms of composite particles, we will carry out this assertion in a manner
that the generalised sl(2) algebra could be related to composite particles with
angular momentum.


title:
SpectroWeb: An Interactive Graphical Database of Digital Stellar
  Spectral Atlases

abstract:
  SpectroWeb is an online maintained interactive graphical database of digital
spectral atlases of spectral standard stars at http://spectra.freeshell.org .
It is an efficient and user-friendly research tool for accurate analyses of
stellar spectra observed with large spectral resolution, including the solar
spectrum. The web-interface displays observed and theoretical stellar spectra,
and comprehensively provides detailed atomic and molecular line information via
user interaction. It fully integrates interactive spectrum visualization tools
for the analysis, management, and maintenance of large volumes of spectral
line-identification, -transition, and -property data. SpectroWeb 1.0 currently
offers optical (3300-6800 A) flux normalized high-resolution spectra of
Betelgeuse (M2), Arcturus (K1), The Sun (G2), Beta Aqr (G0), Procyon (F5), and
Canopus (F0). The provided line identifications are based on state of the art
spectrum synthesis calculations. The graphical database is under permanent
development as an online repository of identified (absorption) lines in
spectral standard reference stars, covering a broad range of stellar spectral
types. Its object-oriented (Java) implementation offers future expansion
capabilities to link and read stellar spectral atlases from various public
internet sites.


title: Scenarios for ILC in 2010

abstract:
  Assuming that first significant results from LHC become available, this
presentation assumes 4 different scenarios and discuss the implications for ILC


title: Towards a realistic Standard Model from D-brane configurations

abstract:
  Effective low energy models arising in the context of D-brane configurations
with Standard Model (SM) gauge symmetry extended by several gauged abelian
factors are discussed. The models are classified according to their hypercharge
embeddings consistent with the SM spectrum hypercharge assignment. Particular
cases are analyzed according to their perspectives and viability as low energy
effective field theory candidates. The resulting string scale is determined by
means of a two-loop renormalization group calculation. Their implications in
Yukawa couplings, neutrinos and flavor changing processes are also presented.


title: Relating two Hopf algebras built from an operad

abstract:
  Starting from an operad, one can build a family of posets. From this family
of posets, one can define an incidence Hopf algebra. By another construction,
one can also build a group directly from the operad. We then consider its Hopf
algebra of functions. We prove that there exists a surjective morphism from the
latter Hopf algebra to the former one. This is illustrated by the case of an
operad built on rooted trees, the $\NAP$ operad, where the incidence Hopf
algebra is identified with the Connes-Kreimer Hopf algebra of rooted trees.


title: Three Dimensional Radiative Transfer in Winds of Massive Stars: Wind3D

abstract:
  We discuss the development of the new radiative transfer code Wind3D. It
solves the non-LTE radiative transport problem in moving stellar atmosphere
models in three geometric dimensions. The code accepts arbitrary 3D velocity
fields in Cartesian geometry without assumptions of axial symmetry. Wind3D is
currently implemented as a fully parallelized (exact) accelerated lambda
iteration scheme with a two level atom formulation. The numerical transfer
scheme is efficient and very accurate to trace small variations of local
velocity gradients on line opacity in strongly scattering dominated extended
stellar winds. We investigate the detailed formation of P Cygni line profiles
observed in ultraviolet spectra of massive stars. We compute the detailed shape
of these resonance lines to model local enhancements of line opacity that can
for instance be caused by clumping in supersonically expanding winds. Wind3D
will be applied to hydrodynamic models to investigate physical properties of
discrete absorption line components.


title: Spatial patterns in optical lattices submitted to gauge potentials

abstract:
  We study the vortex formation in optical lattices submitted to artificial
gauge potentials. We compute the superfluid density for Abelian and non-Abelian
gauge potentials with a mean-field approach of the Bose-Hubbard model and we
determine the rule describing the number of vortices as a function of the
effective magnetic flux. This simple rule is represented by a remarkably rich
figure that represents the superfluid density as a function of the flux. The
phenomena which emanate from this work should be observed experimentally in
optical lattices within which atom tunneling is laser-assisted and described by
commutative or non-commutative tunneling operators.


title: Fiber-optic realization of anisotropic depolarizing quantum channels

abstract:
  We employed an electrically-driven polarization controller to implement
anisotropic depolarizing quantum channels for the polarization state of single
photons. The channels were characterized by means of ancilla-assisted quantum
process tomography using polarization-entangled photons generated in the
process of spontaneous parametric down-conversion. The demonstrated
depolarization method offers good repeatability, low cost, and compatibility
with fiber-optic setups. It does not perturb the modal structure of single
photons, and therefore can be used to verify experimentally protocols for
managing decoherence effects based on multiphoton interference.


title: Scaling limits for random fields with long-range dependence

abstract:
  This paper studies the limits of a spatial random field generated by
uniformly scattered random sets, as the density $\lambda$ of the sets grows to
infinity and the mean volume $\rho$ of the sets tends to zero. Assuming that
the volume distribution has a regularly varying tail with infinite variance, we
show that the centered and renormalized random field can have three different
limits, depending on the relative speed at which $\lambda$ and $\rho$ are
scaled. If $\lambda$ grows much faster than $\rho$ shrinks, the limit is
Gaussian with long-range dependence, while in the opposite case, the limit is
independently scattered with infinite second moments. In a special intermediate
scaling regime, there exists a nontrivial limiting random field that is not
stable.


title:
Affine linear and D4 symmetric lattice equations : symmetry analysis and
  reductions

abstract:
  We consider lattice equations on ${\mathds{Z}}^2$ which are autonomous,
affine linear and possess the symmetries of the square. Some basic properties
of equations of this type are derived, as well as a sufficient linearization
condition and a conservation law. A systematic analysis of the Lie point and
the generalized three- and five-point symmetries is presented. It leads to the
generic form of the symmetry generators of all the equations in this class,
which satisfy a certain non-degeneracy condition. Finally, symmetry reductions
of certain lattice equations to discrete analogues of the Painlev\'e equations
are considered.


title:
Coupled-mode equations and gap solitons in a two-dimensional nonlinear
  elliptic problem with a separable periodic potential

abstract:
  We address a two-dimensional nonlinear elliptic problem with a
finite-amplitude periodic potential. For a class of separable symmetric
potentials, we study the bifurcation of the first band gap in the spectrum of
the linear Schr\"{o}dinger operator and the relevant coupled-mode equations to
describe this bifurcation. The coupled-mode equations are derived by the
rigorous analysis based on the Fourier--Bloch decomposition and the Implicit
Function Theorem in the space of bounded continuous functions vanishing at
infinity. Persistence of reversible localized solutions, called gap solitons,
beyond the coupled-mode equations is proved under a non-degeneracy assumption
on the kernel of the linearization operator. Various branches of reversible
localized solutions are classified numerically in the framework of the
coupled-mode equations and convergence of the approximation error is verified.
Error estimates on the time-dependent solutions of the Gross--Pitaevskii
equation and the coupled-mode equations are obtained for a finite-time
interval.


title:
Further Comments on "Residue-to-Binary Converters Based on New Chinese
  Remainder Theorems"

abstract:
  Ananda Mohan suggested that the first New Chinese Remainder Theorem
introduced by Wang can be derived from the constructive proof of the well-known
Chinese Remainder Theorem (CRT) and claimed that Wang's approach is the same as
the one proposed earlier by Huang. Ananda Mohan's proof is however erroneous
and we show here that Wang's New CRT I is a rewriting of an algorithm
previously sketched by Hitz and Kaltofen.


title:
Absence of a structural glass phase in a monoatomic model liquid
  predicted to undergo an ideal glass transition

abstract:
  We study numerically a monodisperse model of interacting classical particles
predicted to exhibit a static liquid-glass transition. Using a dynamical Monte
Carlo method we show that the model does not freeze into a glassy phase at low
temperatures. Instead, depending on the choice of the hard-core radius for the
particles the system either collapses trivially or a polycrystalline hexagonal
structure emerges.


title:
Malliavin calculus and Clark-Ocone formula for functionals of a
  square-integrable L\'evy process

abstract:
  In this paper, we construct a Malliavin derivative for functionals of
square-integrable L\'evy processes and derive a Clark-Ocone formula. The
Malliavin derivative is defined via chaos expansions involving stochastic
integrals with respect to Brownian motion and Poisson random measure. As an
illustration, we compute the explicit martingale representation for the maximum
of a L\'evy process.


title: Contact line stability of ridges and drops

abstract:
  Within the framework of a semi-microscopic interface displacement model we
analyze the linear stability of sessile ridges and drops of a non-volatile
liquid on a homogeneous, partially wet substrate, for both signs and arbitrary
amplitudes of the three-phase contact line tension. Focusing on perturbations
which correspond to deformations of the three-phase contact line, we find that
drops are generally stable while ridges are subject only to the long-wavelength
Rayleigh-Plateau instability leading to a breakup into droplets, in contrast to
the predictions of capillary models which take line tension into account. We
argue that the short-wavelength instabilities predicted within the framework of
the latter macroscopic capillary theory occur outside its range of validity and
thus are spurious.


title: Strong decay $\Delta^{++} \to p\pi$ with light-cone QCD sum rules

abstract:
  In this article, we calculate the strong coupling constant $g_{\Delta N\pi}$
and study the strong decay $\Delta^{++} \to p\pi$ with the light-cone QCD sum
rules. The numerical value of the strong coupling constant $g_{\Delta N\pi}$ is
consistent with the experimental data. The small discrepancy maybe due to
failure to take into account the perturbative $\mathcal {O}(\alpha_s)$
corrections.


title: A high-velocity transient outflow in Eta Carinae

abstract:
  We analyze velocity profiles of the X-ray spectral lines emitted by the Eta
Carinae stellar binary at four epochs, just before the X-ray minimum
(associated with periastron) and more than two years before the minimum
(~apastron). The profiles are nicely resolved by the HETGS spectrometer on
board Chandra. Far from periastron, we find symmetrical lines that are more or
less centered at zero velocity. Closer to periastron, the lines broaden, shift
towards the blue, and become visibly asymmetric. While the quiescent X-ray
emission and slight (<200 km/sec) centroid shifts can be ascribed to the
ordinary continuous binary wind interaction and to the orbital velocity of the
secondary star, the observed high-velocity emission up to ~2,000 km/sec and the
abrupt flares during which it occurs can not. This leads us to interpret the
high-velocity flaring emission as due to a fast collimated outflow of ionized
gas.


title:
Non-Hermitian von Roos Hamiltonian's $\eta$-weak-pseudo-Hermiticity,
  isospectrality and exact solvability

abstract:
  A complexified von Roos Hamiltonian is considered and a Hermitian first-order
intertwining differential operator is used to obtain the related position
dependent mass $\eta$-weak-pseudo-Hermitian Hamiltonians. Using a
Liouvillean-type change of variables, the $\eta$-weak-pseudo-Hermitian von Roos
Hamiltonians H(x) are mapped into the traditional Schrodinger Hamiltonian form
H(q), where exact isospectral correspondence between H(x) and H(q) is obtained.
Under a user-friendly position dependent mass settings, it is observed that for
each exactly-solvable $\eta$-weak-pseudo-Hermitian reference-Hamiltonian
H(q)there is a set of exactly-solvable $\eta$-weak-pseudo-Hermitian isospectral
target-Hamiltonians H(x). A non-Hermitian PT-symmetric Scarf II and a
non-Hermitian periodic-type PT-symmetric Samsonov-Roy potentials are used as
reference models and the corresponding $\eta$-weak-pseudo-Hermitian isospectral
target-Hamiltonians are obtained.


title: Non-local Andreev reflection in superconducting quantum dots

abstract:
  With the aid of the Keldysh technique we develop a microscopic theory of
non-local electron transport in three-terminal NSN structures consisting of a
chaotic superconducting quantum dot attached to one superconducting and two
normal electrodes. Our theory fully accounts for non-equilibrium effects and
disorder in a superconducting terminal. We go beyond perturbation theory in
tunneling and derive a general expression for the system conductance matrix
which remains valid in both weak and strong tunneling limits. We demonstrate
that the proximity effect yields a decrease of crossed Andreev reflection
(CAR). Beyond weak tunneling limit the contribution of CAR to the non-local
conductance does not cancel that of direct electron transfer between two normal
terminals. We argue that temperature dependence of the non-local resistance of
NSN devices is determined by the two competing processes -- Andreev reflection
and charge imbalance -- and it has a pronounced peak occurring at the crossover
between these two processes. This behavior is in a good agreement with recent
experimental observations.


title: Partially quenched chiral perturbation theory in the epsilon-regime

abstract:
  We calculate meson correlators in the epsilon-regime within partially
quenched chiral perturbation theory. The valence quark masses and sea quark
masses can be chosen arbitrary and all non-degenerate. Taking some of the sea
quark masses to infinity, one obtains a smooth connection among the theories
with different number of flavors, as well as the quenched theory. These results
can be directly compared with lattice QCD simulations.


title: Difference Discrete Connection and Curvature on Cubic Lattice

abstract:
  In a way similar to the continuous case formally, we define in different but
equivalent manners the difference discrete connection and curvature on discrete
vector bundle over the regular lattice as base space. We deal with the
difference operators as the discrete counterparts of the derivatives based upon
the differential calculus on the lattice. One of the definitions can be
extended to the case over the random lattice. We also discuss the relation
between our approach and the lattice gauge theory and apply to the discrete
integrable systems.


title:
Spatial simulations of the Kelvin-Helmholtz instability in astrophysical
  jets

abstract:
  The long term magnetohydrodynamic stability of magnetized
transonic/supersonic jets is numerically investigated using a spatial approach.
We focus on two-dimensional linearly-unstable slab configurations where the jet
is embedded in a flow-aligned uniform magnetic field of weak amplitude. We
compare our results with previous studies using a temporal approach where
longitudinally periodic domains were adopted. The finite-volume based versatile
advection code (VAC) is used to solve the full set of ideal compressible MHD
equations. We follow the development of Kelvin-Helmholtz modes that are driven
by a white noise perturbation continuously introduced at the jet inlet. No
noticeable difference is observed in spatial simulations versus analogous
temporal ones during the linear and early non-linear evolution of the
configuration. However, in the case of transonic flows, a different long-term
scenario occurs in our spatial runs. Indeed, after the large-scale disruption
of the flow, a sheath region of enhanced magnetic field encompassing the jet
core forms along the whole flow. This provides a partial stabilization
mechanism leading to enhanced stability for later times, which is almost
independent of the initial magnitude of the magnetic field. The implication of
this mechanism for the stability of astrophysical jets is discussed.


title: A cosmic ray current driven instability in partially ionised media

abstract:
  We investigate the growth of hydromagnetic waves driven by streaming cosmic
rays in the precursor environment of a supernova remnant shock. It is known
that transverse waves propagating parallel to the mean magnetic field are
unstable to anisotropies in the cosmic ray distribution, and may provide a
mechanism to substantially amplify the ambient magnetic field. We quantify the
extent to which temperature and ionisation fractions modify this picture. Using
a kinetic description of the plasma we derive the dispersion relation for a
collisionless thermal plasma with a streaming cosmic ray current. Fluid
equations are then used to discuss the effects of neutral-ion collisions. We
calculate the extent to which the environment into which the cosmic rays
propagate influences the growth of the magnetic field, and determines the range
of possible growth rates. If the cosmic ray acceleration is efficient, we find
that very large neutral fractions are required to stabilise the growth of the
non-resonant mode. For typical supernova parameters in our galaxy, thermal
effects do not significantly alter the growth rates. For weakly driven modes,
ion-neutral damping can dominate over the instability at more modest ionisation
fractions. In the case of a supernova shock interacting with a molecular
clouds, such as in RX J1713.7-3946, with high density and low ionisation, the
modes can be rapidly damped.


title:
16-20 Jupiter mass RV companion orbiting the brown dwarf candidate
  ChaHa8

abstract:
  We report the discovery of a 16-20 Jupiter mass radial velocity companion
around the very young (~3 Myr) brown dwarf candidate ChaHa8 (M5.75-M6.5). Based
on high-resolution echelle spectra of ChaHa8 taken between 2000 and 2007 with
UVES at the VLT, a companion was detected through RV variability with a
semi-amplitude of 1.6 km/s. A Kepler fit to the data yields an orbital period
of the companion of 1590 days and an eccentricity of e=0.49. A companion
minimum mass M2sini between 16 and 20 Jupiter masses is derived when using
model-dependent mass estimates for the primary. The mass ratio q= M2/M1 might
be as small as 0.2 and, with a probability of 87%, it is less than 0.4. ChaHa8
harbors most certainly the lowest mass companion detected so far in a close (~
1 AU) orbit around a brown dwarf or very low-mass star. From the uncertainty in
the orbit solution, it cannot completely be ruled out that the companion has a
mass in the planetary regime. Its discovery is in any case an important step
towards RV planet detections around BDs. Further, ChaHa8 is the fourth known
spectroscopic brown dwarf or very low-mass binary system with an RV orbit
solution and the second known very young one.


title: On Categorical Theory-Building: Beyond the Formal

abstract: I propose a notion of theory motivated by Category theory.


title: Ergodic properties of Poissonian ID processes

abstract:
  We show that a stationary IDp process (i.e., an infinitely divisible
stationary process without Gaussian part) can be written as the independent sum
of four stationary IDp processes, each of them belonging to a different class
characterized by its L\'{e}vy measure. The ergodic properties of each class
are, respectively, nonergodicity, weak mixing, mixing of all order and
Bernoullicity. To obtain these results, we use the representation of an IDp
process as an integral with respect to a Poisson measure, which, more
generally, has led us to study basic ergodic properties of these objects.


title: p-adic elliptic polylogarithm, p-adic Eisenstein series and Katz measure

abstract:
  The specializations of the motivic elliptic polylog are called motivic
Eisenstein classes. For applications to special values of L-Functions, it is
important to compute the realizations of these classes. In this paper, we prove
that the syntomic realization of the motivic Eisenstein classes, restricted to
the ordinary locus of the modular curve, may be expressed using p-adic
Eisenstein-Kronecker series. These p-adic modular forms are defined using the
two-variable p-adic measure with values in p-adic modular forms constructed by
Katz.


title: Parshin Residues via Coboundary Operators

abstract:
  The article consist of two main parts: an analog of the Leray Theory for
Singular Varieties and its application to the Theory of Parshin's Residues. The
first part is independent from the second. It uses the theory of Whitney
stratifications. The second part is an application of the first. In particular,
a geometric and very transparent proof of the Parshin's Reciprocity Law for
residues is given.


title: Three- and four-jet final states in photoproduction at HERA

abstract:
  Three- and four-jet final states have been measured in photoproduction at
HERA using the ZEUS detector with an integrated luminosity of 121 pb^-1. The
results are presented for jets with transverse energy E_T^jet>6 GeV and
pseudorapidity |eta^jet|<2.4, in the kinematic region given by the virtuality
of the photon Q^2<1 GeV^2 and the inelasticity 0.2<y<0.85 and in two mass
regions defined as 25<M_nj<50 GeV and M_nj>50 GeV, where M_nj is the invariant
mass of the n-jet system. The four-jet photoproduction cross section has been
measured for the first time and represents the highest-order process studied at
HERA. Both the three- and four-jet cross sections have been compared with
leading-logarithmic parton-shower Monte Carlo models, with and without
multi-parton interactions. The three-jet cross sections have been compared to
an order(alpha alpha_s^2) perturbative QCD calculation.


title: Recent Advances in Solving the Protein Threading Problem

abstract:
  The fold recognition methods are promissing tools for capturing the structure
of a protein by its amino acid residues sequence but their use is still
restricted by the needs of huge computational resources and suitable efficient
algorithms as well. In the recent version of FROST (Fold Recognition Oriented
Search Tool) package the most efficient algorithm for solving the Protein
Threading Problem (PTP) is implemented due to the strong collaboration between
the SYMBIOSE group in IRISA and MIG in Jouy-en-Josas. In this paper, we present
the diverse components of FROST, emphasizing on the recent advances in
formulating and solving new versions of the PTP and on the way of solving on a
computer cluster a million of instances in a easonable time.


title: Stress Tensor from the Trace Anomaly in Reissner-Nordstrom Spacetimes

abstract:
  The effective action associated with the trace anomaly provides a general
algorithm for approximating the expectation value of the stress tensor of
conformal matter fields in arbitrary curved spacetimes. In static, spherically
symmetric spacetimes, the algorithm involves solving a fourth order linear
differential equation in the radial coordinate r for the two scalar auxiliary
fields appearing in the anomaly action, and its corresponding stress tensor. By
appropriate choice of the homogeneous solutions of the auxiliary field
equations, we show that it is possible to obtain finite stress tensors on all
Reissner-Nordstrom event horizons, including the extreme Q=M case. We compare
these finite results to previous analytic approximation methods, which yield
invariably an infinite stress-energy on charged black hole horizons, as well as
with detailed numerical calculations that indicate the contrary. The
approximation scheme based on the auxiliary field effective action reproduces
all physically allowed behaviors of the quantum stress tensor, in a variety of
quantum states, for fields of any spin, in the vicinity of the entire family (0
le Q le M) of RN horizons.


title: Types of quantum information

abstract:
  Quantum, in contrast to classical, information theory, allows for different
incompatible types (or species) of information which cannot be combined with
each other. Distinguishing these incompatible types is useful in understanding
the role of the two classical bits in teleportation (or one bit in one-bit
teleportation), for discussing decoherence in information-theoretic terms, and
for giving a proper definition, in quantum terms, of ``classical information.''
Various examples (some updating earlier work) are given of theorems which
relate different incompatible kinds of information, and thus have no
counterparts in classical information theory.


title: Detection of incompatible properties

abstract:
  In a typical two-slits experiments we face the question whether it is
possible or not to attain knowledge about properties incompatible with
Which-Slit property together with the measurement of the final impact point. A
wide family of solutions is concretely found and an ideal experiment realizing
such a detection is designed, relatively to the detection of three such
incompatible properties. In the case of four incompatible properties, general
conditions for the existence of solutions are singled out and a particular
family of solutions is provided.


title: A hermitian analogue of the Broecker-Prestel theorem

abstract:
  The Broecker-Prestel local-global principle characterizes weak isotropy of
quadratic forms over a formally real field in terms of weak isotropy over the
henselizations and isotropy over the real closures of that field. A hermitian
analogue of this principle is presented for algebras of index at most two. An
improved result is also presented for algebras with a decomposable involution,
algebras of pythagorean index at most two, and algebras over SAP and ED fields.


title: Computation of determinants using contour integrals

abstract:
  It is shown how the pre-exponential factor of the Feynman propagator for a
large class of potentials can be computed using contour integrals. This is of
direct relevance in the context of tunnelling processes in quantum theories.
The prerequisites for this analysis are accessible to advanced undergraduate
students and involve only introductory courses in ordinary differential
equations and complex variables.


title: Finite depth and Jacobson-Bourbaki correspondence

abstract:
  We introduce a notion of depth three tower of three rings C < B < A with
depth two ring extension A | B recovered when B = C. If A = \End B_C and B | C
is a Frobenius extension, this captures the notion of depth three for a
Frobenius extension in arXiv:math/0107064 and arXiv:math/0108067, such that if
B | C is depth three, then A | C is depth two (a phenomenon of finite depth
subfactors, see arXiv:math/0006057). We provide a similar definition of finite
depth Frobenius extension with embedding theorem utilizing a depth three
subtower of the Jones tower. If A, B and C correspond to a tower of subgroups G
> H > K via the group algebra over a fixed base ring, the depth three condition
is the condition that subgroup K has normal closure K^G contained in H. For a
depth three tower of rings, there is a pre-Galois theory for the ring \End
{}_BA_C and coring (A \o_B A)^C involving Morita context bimodules and left
coideal subrings. This is applied in two sections to a specialization of a
Jacobson-Bourbaki correspondence theorem for augmented rings to depth two
extensions with depth three intermediate division rings.


title:
Permafrost - An Alternative Target Material for Ultra High Energy
  Neutrino Detection?

abstract:
  The detection of cosmic neutrinos with energies above 1017 eV got growing
interest during recent years. Possible target materials for in-matter arrays of
~100 km3 size under discussion are water, ice and rock salt. Here we propose to
investigate permafrost as an additional alternative, covering ~20% of Earth
land surface and reaching down to more than 1000 m depth at certain locations.
If sufficiently large attenuation lengths for radio and acoustic signals can be
demonstrated by in-situ measurements, the construction of a large hybrid array
within this material may be possible in the Northern hemisphere. Properties and
problems of a possible location in Siberia are discussed below. Some acoustic
data are compared to laboratory measurements using "artificial" permafrost.


title: On Landau--Ginzburg models for Fano varieties

abstract:
  We observe a method for finding weak Landau-Ginzburg models for Fano
varieties and find them for smooth Fano threefolds of genera 9, 10, and 12.


title: The space of density states in geometrical quantum mechanics

abstract:
  We present a geometrical description of the space of density states of a
quantum system of finite dimension. After presenting a brief summary of the
geometrical formulation of Quantum Mechanics, we proceed to describe the space
of density states $\D(\Hil)$ from a geometrical perspective identifying the
stratification associated to the natural $GL(\Hil)$--action on $\D(\Hil)$ and
some of its properties. We apply this construction to the cases of quantum
systems of two and three levels.


title: Striped phases in two dimensional dipole systems

abstract:
  We prove that a system of discrete 2D in-plane dipoles with four possible
orientations, interacting via a 3D dipole-dipole interaction plus a nearest
neighbor ferromagnetic term, has periodic striped ground states. As the
strength of the ferromagnetic term is increased, the size of the stripes in the
ground state increases, becoming infinite, i.e., giving a ferromagentic ground
state, when the ferromagentic interaction exceeds a certain critical value. We
also give a rigorous proof of the reorientation transition in the ground state
of a 2D system of discrete dipoles with six possible orientations, interacting
via a 3D dipole-dipole interaction plus a nearest neighbor antiferromagnetic
term. As the strength of the antiferromagnetic term is increased the ground
state flips from being striped and in-plane to being staggered and
out-of-plane. An example of a rotator model with a sinusoidal ground state is
also discussed.


title:
Energy and composition sensitivity of geosynchrotron radio emission from
  EAS

abstract:
  We analyse the sensitivity of geosynchrotron radio emission from inclined
extensive air showers to the energy and mass of primary cosmic rays. We
demonstrate that radio emission measurements at suitable lateral distances can
infer both the number of electrons and positrons in the shower maximum and the
atmospheric depth of the maximum on a shower-to-shower basis. Alternatively,
measurements at a fixed lateral distance but in two different observing
frequency bands yield comparable information. An RMS error of 5% in the
determination of the number of electrons and positrons at shower maximum can be
achieved. Through the determination of these quantities, geosynchrotron
radiation provides access to the energy and mass of primary cosmic rays on a
shower-to-shower basis.


title: Hanle Effect near Boundaries

abstract:
  The Hanle effect describes suppression of spin polarization due to precession
in a magnetic field. This is a standard spintronics tool and it gives access to
the spin lifetime of samples in which spins are generated homogeneously. We
examine the Hanle effect when spins are generated at a boundary of a diffusive
sample by the extrinsic spin Hall effect. We show that the Hanle curve is
spatially dependent and that the "apparent" spin lifetime, given by its inverse
half-width, is shorter near the boundary even if the spin relaxation rate is
homogenous.


title:
REAS2: CORSIKA-based Monte Carlo simulations of geosynchrotron radio
  emission

abstract:
  Simulations of geosynchrotron radio emission from extensive air showers
performed with the Monte Carlo code REAS1 used analytical parameterisations to
describe the spatial, temporal, energy and angular particle distributions in
air showers. The successor REAS2 replaces these parameterisations with precise,
multi-dimensional histograms derived from per-shower CORSIKA simulations. REAS2
allows an independent selection between parameterisation and histogram for each
of the relevant particle distributions, enabling us to study the changes
arising from using a more realistic air shower model in detail. We describe the
new simulation strategy and illustrate the effects introduced by the improved
air shower model.


title:
A timestepper approach for the systematic bifurcation and stability
  analysis of polymer extrusion dynamics

abstract:
  We discuss how matrix-free/timestepper algorithms can efficiently be used
with dynamic non-Newtonian fluid mechanics simulators in performing systematic
stability/bifurcation analysis. The timestepper approach to bifurcation
analysis of large scale systems is applied to the plane Poiseuille flow of an
Oldroyd-B fluid with non-monotonic slip at the wall, in order to further
investigate a mechanism of extrusion instability based on the combination of
viscoelasticity and nonmonotonic slip. Due to the nonmonotonicity of the slip
equation the resulting steady-state flow curve is nonmonotonic and unstable
steady-states appear in the negative-slope regime. It has been known that
self-sustained oscillations of the pressure gradient are obtained when an
unstable steady-state is perturbed [Fyrillas et al., Polymer Eng. Sci. 39
(1999) 2498-2504].
  Treating the simulator of a distributed parameter model describing the
dynamics of the above flow as an input-output black-box timestepper of the
state variables, stable and unstable branches of both equilibrium and periodic
oscillating solutions are computed and their stability is examined. It is shown
for the first time how equilibrium solutions lose stability to oscillating ones
through a subcritical Hopf bifurcation point which generates a branch of
unstable limit cycles and how the stable periodic solutions lose their
stability through a critical point which marks the onset of the unstable limit
cycles. This implicates the coexistence of stable equilibria with stable and
unstable periodic solutions in a narrow range of volumetric flow rates.


title:
Exchange shift of stripe domains in antiferromagnetically coupled
  multilayers

abstract:
  Antiferromagnetically coupled multilayers with perpendicular anisotropy, as
[CoPt]/Ru, Co/Ir, Fe/Au, display ferromagnetic stripe phases as the ground
states. It is theoretically shown that the antiferromagnetic interlayer
exchange causes a relative shift of domains in adjacent layers. This ``exchange
shift'' is responsible for several recently observed effects: an anomalous
broadening of domain walls, the formation of so-called ``tiger-tail'' patterns,
and a ``mixed state'' of antiferromagnetic and ferromagnetic domains in
[CoPt]/Ru multilayers. The derived analitical relations between the values of
the shift and the strength of antiferromagnetic coupling provide an effective
method for a quantitative determination of the interlayer exchange
interactions.


title: Wind on the boundary for the Abelian sandpile model

abstract:
  We continue our investigation of the two-dimensional Abelian sandpile model
in terms of a logarithmic conformal field theory with central charge c=-2, by
introducing two new boundary conditions. These have two unusual features: they
carry an intrinsic orientation, and, more strangely, they cannot be imposed
uniformly on a whole boundary (like the edge of a cylinder). They lead to seven
new boundary condition changing fields, some of them being in highest weight
representations (weights -1/8, 0 and 3/8), some others belonging to
indecomposable representations with rank 2 Jordan cells (lowest weights 0 and
1). Their fusion algebra appears to be in full agreement with the fusion rules
conjectured by Gaberdiel and Kausch.

categories: cond-mat.stat-mech hep-th math-ph math.MP


title: Observation of condensed phases of quasi-planar core-softened colloids

abstract:
  We experimentally study the condensed phases of repelling core-softened
spheres in two dimensions. The dipolar pair repulsion between superparamagnetic
spheres trapped in a thin cell is induced by a transverse magnetic field and
softened by suitably adjusting the cell thickness. We scan a broad density
range and we materialize a large part of the theoretically predicted phases in
systems of core-softened particles, including expanded and close-packed
hexagonal, square, chain-like, stripe/labyrinthine, and honeycomb phase.
Further insight into their structure is provided by Monte Carlo simulations.


title: Optical Properties of Pentacene and Perfluoropentacene Thin Films

abstract:
  The optical properties of pentacene (PEN) and perfluoropentacene(PFP) thin
films on various SiO2 substrates were studied using variable angle
spectroscopic ellipsometry. Structural characterization was performed using
X-ray reflectivity and atomic force microscopy. A uniaxial model with the optic
axis normal to the sample surface was used to analyze the ellipsometry data. A
Strong optical anisotropy was observed and enabled the direction of the
transition dipole of the absorption bands to be determined. Furthermore,
comparison of the optical constants of PEN and PFP thin films with the
absorption spectra of the monomers in solution shows significant changes due to
the crystalline environment. Relative to the monomer spectrum the HOMO-LUMO
transition observed in PEN (PFP) thin film is reduced by 210 meV (280 meV).
Surprisingly, a second absorption band in the PFP thin film shows a slight
blueshift (40 meV) compared to the spectrum of the monomer with its transition
dipole perpendicular to that of the first absorption band.


title: Superintegrability on sl(2)-coalgebra spaces

abstract:
  We review a recently introduced set of N-dimensional quasi-maximally
superintegrable Hamiltonian systems describing geodesic motions, that can be
used to generate "dynamically" a large family of curved spaces. From an
algebraic viewpoint, such spaces are obtained through kinetic energy
Hamiltonians defined on either the sl(2) Poisson coalgebra or a quantum
deformation of it. Certain potentials on these spaces and endowed with the same
underlying coalgebra symmetry have been also introduced in such a way that the
superintegrability properties of the full system are preserved. Several new N=2
examples of this construction are explicitly given, and specific Hamiltonians
leading to spaces of non-constant curvature are emphasized.


title: Genetic progression and the waiting time to cancer

abstract:
  Cancer results from genetic alterations that disturb the normal cooperative
behavior of cells. Recent high-throughput genomic studies of cancer cells have
shown that the mutational landscape of cancer is complex and that individual
cancers may evolve through mutations in as many as 20 different
cancer-associated genes. We use data published by Sjoblom et al. (2006) to
develop a new mathematical model for the somatic evolution of colorectal
cancers. We employ the Wright-Fisher process for exploring the basic parameters
of this evolutionary process and derive an analytical approximation for the
expected waiting time to the cancer phenotype. Our results highlight the
relative importance of selection over both the size of the cell population at
risk and the mutation rate. The model predicts that the observed genetic
diversity of cancer genomes can arise under a normal mutation rate if the
average selective advantage per mutation is on the order of 1%. Increased
mutation rates due to genetic instability would allow even smaller selective
advantages during tumorigenesis. The complexity of cancer progression thus can
be understood as the result of multiple sequential mutations, each of which has
a relatively small but positive effect on net cell growth.


title: Evolution of dwarf galaxies in the Centaurus A group

abstract:
  We consider star formation properties of dwarf galaxies in Cen A group
observed within our HST/ACS projects number 9771 and 10235. We model
color-magnitude diagrams of the galaxies under consideration and measure star
formation rate and metallicity dependence on time. We study environmental
dependence of the galaxy evolution and probable origin of the dwarf galaxies in
the group.


title:
Superintegrability on N-dimensional spaces of constant curvature from
  so(N+1) and its contractions

abstract:
  The Lie-Poisson algebra so(N+1) and some of its contractions are used to
construct a family of superintegrable Hamiltonians on the ND spherical,
Euclidean, hyperbolic, Minkowskian and (anti-)de Sitter spaces. We firstly
present a Hamiltonian which is a superposition of an arbitrary central
potential with N arbitrary centrifugal terms. Such a system is quasi-maximally
superintegrable since this is endowed with 2N-3 functionally independent
constants of the motion (plus the Hamiltonian). Secondly, we identify two
maximally superintegrable Hamiltonians by choosing a specific central potential
and finding at the same time the remaining integral. The former is the
generalization of the Smorodinsky-Winternitz system to the above six spaces,
while the latter is a generalization of the Kepler-Coulomb potential, for which
the Laplace-Runge-Lenz N-vector is also given. All the systems and constants of
the motion are explicitly expressed in a unified form in terms of ambient and
polar coordinates as they are parametrized by two contraction parameters
(curvature and signature of the metric).


title: Conformal paracontact curvature and the local flatness theorem

abstract:
  A curvature-type tensor invariant called para contact (pc) conformal
curvature is defined on a paracontact manifold. It is shown that a paracontact
manifold is locally paracontact conformal to the hyperbolic Heisenberg group or
to a hyperquadric of neutral signature if and only if the pc conformal
curvature vanishes. In the three dimensional case the corresponding result is
achieved through employing a certain symmetric (0,2) tensor. The well known
result of Cartan-Chern-Moser giving necessary and sufficient condition a
CR-structure to be CR equivalent to a hyperquadric in the complex vector space
is presented in-line with the paracontact case. An explicit formula for the
regular part of a solution to the sub-ultrahyperbolic Yamabe equation on the
hyperbolic Heisenberg group is shown.


title: Spin geometry of entangled qubits under bilocal decoherence modes

abstract:
  The Lindblad generators of the master equation define which kind of
decoherence happens in an open quantum system. We are working with a two qubit
system and choose the generators to be projection operators on the eigenstates
of the system and unitary bilocal rotations of them. The resulting decoherence
modes are studied in detail. Besides the general solutions we investigate the
special case of maximally entangled states - the Bell singlet states. The
results are depicted in the so-called spin geometry picture which allows to
illustrate the evolution of the (nonlocal) correlations stored in a certain
state. The question for which conditions the path traced out in the geometric
picture depends only on the relative angle between the bilocal rotations is
addressed.


title: Predicting Knot or Catenane Type of Site-Specific Recombination Products

abstract:
  Site-specific recombination on supercoiled circular DNA yields a variety of
knotted or catenated products. We develop a model of this process, and give
extensive experimental evidence that the assumptions of our model are
reasonable. We then characterize all possible knot or catenane products that
arise from the most common substrates. We apply our model to tightly prescribe
the knot or catenane type of previously uncharacterized data.


title: Polar phonons and spin-phonon coupling in HgCr2S4 and CdCr2S4

abstract:
  Polar phonons of HgCr2S4 and CdCr2S4 are studied by far-infrared spectroscopy
as a function of temperature and external magnetic field. Eigenfrequencies,
damping constants, effective plasma frequencies and Lyddane-Sachs-Teller
relations, and effective charges are determined. Ferromagnetic CdCr2S4 and
antiferromagnetic HgCr2S4 behave rather similar. Both compounds are dominated
by ferromagnetic exchange and although HgCr2S4 is an antiferromagnet, no phonon
splitting can be observed at the magnetic phase transition. Temperature and
magnetic field dependence of the eigenfrequencies show no anomalies indicating
displacive polar soft mode behavior. However, significant effects are detected
in the temperature dependence of the plasma frequencies indicating changes in
the nature of the bonds and significant charge transfer. In HgCr2S4 we provide
experimental evidence that the magnetic field dependence of specific polar
modes reveal shifts exactly correlated with the magnetization showing
significant magneto-dielectric effects even at infrared frequencies.


title: Nonfibered knots and representation shifts

abstract:
  The authors conjectured previously that a knot is nonfibered if and only if
its infinite cyclic cover has uncountably many finite covers. We prove the
conjecture for a class of knots that includes all knots of genus 1, using
techniques from symbolic dynamics.


title:
Renormalization group running cosmologies - from a scale setting to
  holographic dark energy

abstract:
  A scale-dependent cosmological constant $\Lambda$ and the Newton constant G
emerge naturally in quantum field theory in a curved space-time background
leading to renormalization group running cosmologies. A scale-setting procedure
is discussed in these cosmological models and the interpretation of the scale
is emphasized. This setup introduces dark energy without invoking
quintessence-like fields and can be applied to a variety of problems. The
scale-dependent $\Lambda$ and G are also naturally incorporated into the
generalized holographic dark energy model, and applied to different aspects of
cosmology.


title: Modeling DACs in UV Lines of Massive Hot Stars

abstract:
  We apply the 3-dimensional radiative transport code Wind3D to 3D hydrodynamic
models of Corotating Interaction Regions to fit the detailed variability of
Discrete Absorption Components observed in Si IV UV resonance lines of HD 64760
(B0.5 Ib). We discuss important effects of the hydrodynamic input parameters on
these large-scale equatorial wind structures that determine the detailed
morphology of the DACs computed with 3D transfer. The best fit model reveals
that the CIR in HD 64760 is produced by a source at the base of the wind that
lags behind the stellar surface rotation. The non-corotating coherent wind
structure is an extended density wave produced by a local increase of only 0.6
% in the smooth symmetric wind mass-loss rate.


title: Polarization effects on the dielectric properties of molten AgI

abstract:
  The results are reported of molecular dynamics simulations of the static
longitudinal dielectric and response functions for molten AgI at 923 K using
two ionic models. The first one is a rigid ion model, while in the second the
induced dipole moments of the anions are added to the effective pair potentials
of the first. It is derived theoretically that the dielectric functions for the
polarizable ion model are determined by spatial correlations of charge and
dipole moment densities. The charge structure factor at long wavelengths is
also studied.


title: Bijective Faithful Translations among Default Logics

abstract:
  In this article, we study translations between variants of defaults logics
such that the extensions of the theories that are the input and the output of
the translation are in a bijective correspondence. We assume that a translation
can introduce new variables and that the result of translating a theory can
either be produced in time polynomial in the size of the theory or its output
is polynomial in that size; we however restrict to the case in which the
original theory has extensions. This study fills a gap between two previous
pieces of work, one studying bijective translations among restrictions of
default logics, and the other one studying non-bijective translations between
default logics variants.


title: Interactive Small-Step Algorithms I: Axiomatization

abstract:
  In earlier work, the Abstract State Machine Thesis -- that arbitrary
algorithms are behaviorally equivalent to abstract state machines -- was
established for several classes of algorithms, including ordinary, interactive,
small-step algorithms. This was accomplished on the basis of axiomatizations of
these classes of algorithms. Here we extend the axiomatization and, in a
companion paper, the proof, to cover interactive small-step algorithms that are
not necessarily ordinary. This means that the algorithms (1) can complete a
step without necessarily waiting for replies to all queries from that step and
(2) can use not only the environment's replies but also the order in which the
replies were received.


title: Network Rewiring Models

abstract:
  Recently we showed that a simple model of network rewiring could be solved
exactly for any time and any parameter value. We also showed that this model
can be recast in terms of several well known models of statistical physics such
as Urn model and the Voter model. We also noted that it has been applied to a
wide range of problems. Here we consider various generalisations of this model
and include some new exact results.


title: Interaction induced dimerization in zigzag single wall carbon nanotubes

abstract:
  We derive a low-energy effective model of metallic zigzag carbon nanotubes at
half filling. We show that there are three important features characterizing
the low-energy properties of these systems: the long-range Coulomb interaction,
umklapp scattering and an explicit dimerization generated by interactions. The
ratio of the dimerization induced gap and the Mott gap induced by the umklapp
interactions is dependent on the radius of the nanotube and can drive the
system through a quantum phase transition with SU(2)_1 quantum symmetry. We
consider the physical properties of the phases on either side of this
transition which should be relevant for realistic nanotubes.


title: Color superconducting matter in a magnetic field

abstract:
  We investigate the effect of a magnetic field on cold dense three-flavor
quark matter using an effective model with four-Fermi interactions with
electric and color neutrality taken into account. The gap parameters Delta_1,
Delta_2, and Delta_3 representing respectively the predominant pairing between
down and strange (d-s) quarks, strange and up (s-u) quarks, and up and down
(u-d) quarks, show the de Haas-van Alphen effect, i.e. oscillatory behavior as
a function of the modified magnetic field B that can penetrate the color
superconducting medium. Without applying electric and color neutrality we find
Delta_2 \approx Delta_3 >> Delta_1 for 2 e B / mu_q^2, where e is the modified
electromagnetic coupling constant and mu_q is one third of the baryon chemical
potential. Because the average Fermi surface for each pairing is affected by
taking into account neutrality, the gap structure changes drastically in this
case; we find Delta_1 >> Delta_2 \approx Delta_3 for 2 e B > mu_q^2. We point
out that the magnetic fields as strong as presumably existing inside magnetars
might induce significant deviations from the gap structure Delta_1 \approx
Delta_2 \approx Delta_3 at zero magnetic field.


title:
A new mechanism for non-locality from string theory: UV-IR quantum
  entanglement and its imprints on the CMB

abstract:
  Puff field theories (PFT) arise as the decoupling limits of D3 branes in a
Melvin universe and exhibit spatially non-local dynamics. Unlike other
realizations of non-locality in string theory, PFTs have full SO(3) rotational
symmetry. In this work, we analyze the strongly coupled regime of a PFT through
gravitational holography. We find a novel mechanism at the heart of the
phenomenon of non-locality: a quantum entanglement of UV and IR dynamics. In
the holographic bulk, this translates to an apparent horizon splitting the
space into two regions - with the UV completion of the PFT sitting at the
horizon. We unravel this intricate UV-IR setting and devise a prescription for
computing correlators that extends the original dictionary of holographic
renormalization group. We then implement a cosmological scenario where PFT
correlators set the initial conditions for primordial fluctuations. We compute
the associated power spectrum of the CMB and find that the scenario allows for
a distinct stringy signature.


title:
Effective su_q(2) models and polynomial algebras for fermion-boson
  Hamiltonians

abstract:
  Schematic su(2)+h3 interaction Hamiltonians, where su(2) plays the role of
the pseudo-spin algebra of fermion operators and h3 is the Heisenberg algebra
for bosons, are shown to be closely related to certain nonlinear models defined
on a single quantum algebra q-su(2) of quasifermions. In particular, q-su(2)
analogues of the Da Providencia-Schutte and extended Lipkin models are
presented. The connection between q and the physical parameters of the
fermion-boson system is analysed, and the integrability properties of the
interaction Hamiltonians are discussed by using polynomial algebras.


title: Excited-state OH Mainline Masers in AU Geminorum and NML Cygni

abstract:
  Excited-state OH maser emission has previously been reported in the
circumstellar envelopes of only two evolved stars: the Mira star AU Geminorum
and the hypergiant NML Cygni. We present Very Large Array (VLA) observations of
the 1665, 1667, and excited-state 4750 MHz mainline OH transitions in AU Gem
and Expanded Very Large Array (EVLA) observations of the excited-state 6030 and
6035 MHz OH mainline transitions in NML Cyg. We detect masers in both mainline
transitions in AU Gem but no excited-state emission in either star. We conclude
that the excited-state OH emission in AU Gem is either a transient phenomenon
(such as for NML Cyg outlined below), or possibly an artifact in the data, and
that the excited state OH emission in NML Cyg was generated by an episode of
enhanced shock between the stellar mass-loss and an outflow of the Cyg OB2
association. With these single exceptions, it therefore appears that
excited-state OH emission indeed should not be predicted nor observable in
evolved stars as part of their normal structure or evolution.


title:
Interactive Small-Step Algorithms II: Abstract State Machines and
  the<br> Characterization Theorem

abstract:
  In earlier work, the Abstract State Machine Thesis -- that arbitrary
algorithms are behaviorally equivalent to abstract state machines -- was
established for several classes of algorithms, including ordinary, interactive,
small-step algorithms. This was accomplished on the basis of axiomatizations of
these classes of algorithms. In Part I (Interactive Small-Step Algorithms I:
Axiomatization), the axiomatization was extended to cover interactive
small-step algorithms that are not necessarily ordinary. This means that the
algorithms (1) can complete a step without necessarily waiting for replies to
all queries from that step and (2) can use not only the environment's replies
but also the order in which the replies were received. In order to prove the
thesis for algorithms of this generality, we extend here the definition of
abstract state machines to incorporate explicit attention to the relative
timing of replies and to the possible absence of replies. We prove the
characterization theorem for extended abstract state machines with respect to
general algorithms as axiomatized in Part I.