title:
Light charged particle emission from hot $^{32}$S$^{*}$ formed in
  $^{20}$Ne + $^{12}$C reaction

abstract:
  Inclusive energy distributions for light charged particles ($p, d, t$ and
$\alpha$) have been measured in the $^{20}$Ne (158, 170, 180, 200 MeV) +
$^{12}$C reactions in the angular range 10$^{o}$ -- 50$^{o}$. Exclusive light
charged particle energy distribution measurements were also done for the same
system at 158 MeV bombarding energy by in-plane light charged particle --
fragment coincidence. Pre-equilibrium components have been separated out from
proton energy spectra using moving source model considering two sources. The
data have been compared with the predictions of the statistical model code
CASCADE. It has been observed that significant deformation effects were needed
to be introduced in the compound nucleus in order to explain the shape of the
evaporated $d, t$ energy spectra. For protons, evaporated energy spectra were
rather insensitive to nuclear deformation, though angular distributions could
not be explained without deformation. Decay sequence of the hot $^{32}$S
nucleus has been investigated through exclusive light charged particle
measurements using the $^{20}$Ne (158 MeV) + $^{12}$C reaction. Information on
the sequential decay chain has been extracted through comparison of the
experimental data with the predictions of the statistical model. It is observed
from the present analysis that exclusive light charged particle data may be
used as a powerful tool to probe the decay sequence of hot light compound
systems.


title: Fractional Derivative Approach to the Self-gravitation Equation

abstract:
  A new formalism is presented for finding equilibrium distribution functions
for axisymmetric systems. The formalism, obtainded by using the concept of
fractional derivatives, generalizes the methods of Fricke (1952), Kalnajs
(1972) and Jiang & Ossipkov (2007), and has the advantage that can be applied
to a wider variety of models. We found that this approach can be applied both
to tridimensional systems and to flat systems, without the necessity of dealing
with a pseudo-volume mass density. As an application, we obtain the
distribution functions of the Binney's logarithmic model and of the Mestel
disc.


title:
Crystalline ZnMgSe:Cr2+: a new material for active elements of tunable
  IR-lasers

abstract:
  Obtained is a new thermostable material for active elements of tunable
IR-lasers - Zn1-xMgxSe:Cr2+ single crystals. The position of the absorption
band of Cr2+ ions in wurtzite-type Zn0.8Mg0.2Se matrix is established.


title:
Extreme-value statistics of dimensions determining an observer's branch
  of the world?

abstract:
  In a many-worlds framework, combining decoherent histories and extreme-value
statistics, it is conjectured that the (matrix) dimension of the Hamiltonian
processing records and memories near the end of an observer's history is almost
entirely located in a single branch of his/her wavefunction.


title:
Instability of spatial patterns and its ambiguous impact on species
  diversity

abstract:
  Self-arrangement of individuals into spatial patterns often accompanies and
promotes species diversity in ecological systems. Here, we investigate pattern
formation arising from cyclic dominance of three species, operating near a
bifurcation point. In its vicinity, an Eckhaus instability occurs, leading to
convectively unstable "blurred" patterns. At the bifurcation point, stochastic
effects dominate and induce counterintuitive effects on diversity: Large
patterns, emerging for medium values of individuals' mobility, lead to rapid
species extinction, while small patterns (low mobility) promote diversity, and
high mobilities render spatial structures irrelevant. We provide a quantitative
analysis of these phenomena, employing a complex Ginzburg-Landau equation.

categories: q-bio.PE cond-mat.stat-mech nlin.AO physics.bio-ph


title: Differential Evolution of Lyman Break Galaxies from $z$=5 to 3

abstract:
  We briefly summarize our findings from the unbiased surveys for $z$$\sim$5
LBGs based on Subaru/Suprime-Cam and follow-up optical spectroscopy.


title: Weyl groupoids of rank two and continued fractions

abstract:
  A relationship between continued fractions and Weyl groupoids of Cartan
schemes of rank two is found. This allows to decide easily if a given Cartan
scheme of rank two admits a finite root system. We obtain obstructions and
sharp bounds for the entries of the Cartan matrices.
  Key words: Cartan matrix, continued fraction, Nichols algebra, Weyl groupoid


title: A note on the Ricci flow on noncompact manifolds

abstract:
  Let $(M^3,g_0)$ be a complete noncompact Riemannian 3-manifold with
nonnegative Ricci curvature and with injectivity radius bounded away from zero.
Suppose that the scalar curvature $R(x)\to 0$ as $x\to \infty$. Then the Ricci
flow with initial data $(M^3,g_0)$ has a long time solution. This extends a
recent result of Ma and Zhu. We also have a higher dimensional version, and we
reprove a K$\ddot{a}$hler analogy due to Chau, Tam and Yu.


title:
Robustness of noise-present Bell's inequality violation by entangled
  state

abstract:
  The robustness of Bell's inequality (in CHSH form) violation by entangled
state in the simultaneous presence of colored and white noise in the system is
considered. A twophoton polarization state is modeled by twoparameter density
matrix. Setting parameter values one can vary the relative fraction of pure
entangled Bell's state as well as white and colored noise fractions. Bell's
operator-parameter dependence analysis is made. Computational results are
compared with experimental data [quant-ph/0511265] and with results computed
using a oneparameter density matrix [doi: 10.1103/PhysRevA.72.052112], which
one can get as a special case of the model considered in this work.


title:
Interpretation of radio continuum and molecular line observations of Sgr
  B2: free-free and synchrotron emission, and implications for cosmic rays

abstract:
  Recent ammonia (1,1) inversion line data on the Galactic star forming region
Sgr B2 show that the column density is consistent with a radial Gaussian
density profile with a standard deviation of 2.75 pc. Deriving a formula for
the virial mass of spherical Gaussian clouds, we obtain a virial mass of 1.9
million solar masses for Sgr B2. For this matter distribution, a reasonable
magnetic field and an impinging flux of cosmic rays of solar neighbourhood
intensity, we predict the expected synchrotron emission from the Sgr B2 giant
molecular cloud due to secondary electrons and positrons resulting from cosmic
ray interactions, including effects of losses due to pion production collisions
during diffusive propagation into the cloud complex.
  We assemble radio continuum data at frequencies between 330 MHz and 230 GHz.
  From the spectral energy distribution the emission appears to be thermal at
all frequencies. Before using these data to constrain the predicted synchrotron
flux, we first model the spectrum as free-free emission from the known ultra
compact HII regions plus emission from an envelope or wind with a radial
density gradient. This severely constrains the possible synchrotron emission by
secondary electrons to quite low flux levels. The absence of a significant
contribution by secondary electrons is almost certainly due to multi-GeV energy
cosmic rays being unable to penetrate far into giant molecular clouds. This
would also explain why 100 MeV--GeV gamma-rays (from neutral pion decay or
bremsstrahlung by secondary electrons) were not observed from Sgr B2 by EGRET,
while TeV energy gamma-rays were observed, being produced by higher energy
cosmic rays which more readily penetrate giant molecular clouds.


title:
New XMM-Newton analysis of three bright X-ray sources in M31 globular
  clusters, including a new black hole candidate

abstract:
  We present detailed analysis of three globular cluster X-ray sources in the
XMM-Newton extended survey of M31. The X-ray counterpart to the M31 globular
cluster Bo 45 (XBo 45) was observed with XMM-Newton on 2006 December 26. Its
combined pn+MOS 0.3--10 keV lightcurve exhibited a r.m.s variability of ~10%,
and its 0.3--7.0 keV emission spectrum was well described by an absorbed power
law with photon index 1.44$\pm$0.12. Its variability and emission is
characteristic of low mass X-ray binaries (LMXBs) in the low-hard state,
whether the accretor is a neutron star or black hole. Such behaviour is
typically observed at luminosities $\la$10% Eddington. However, XBo 45
exhibited this behaviour at an unabsorbed, 0.3--10 keV luminosity of
2.5$\pm0.2\times 10^{38}$ erg s$^{-1}$, or{~140%} Eddington for a 1.4
$M_{\odot}$ neutron star accreting hydrogen. Hence, we identify XBo 45 as a new
candidate black hole LMXB. XBo 45 appears to have been consistently bright for
~30 years, consistent with theoretical prediction for a globular cluster black
hole binary formed via tidal capture. Bo 375 was observed in the 2007, January
2 XMM-Newton observation, and has a two-component spectrum that is typical for
a bright neutron star LMXB. Bo 135 was observed in the same field as Bo 45, and
could contain either a black hole or neutron star.


title: Laboratory evidence for efficient water formation in interstellar ices

abstract:
  Even though water is the main constituent in interstellar icy mantles, its
chemical origin is not well understood. Three different formation routes have
been proposed following hydrogenation of O, O2, or O3, but experimental
evidence is largely lacking. We present a solid state astrochemical laboratory
study in which one of these routes is tested. For this purpose O2 ice is
bombarded by H- or D-atoms under ultra high vacuum conditions at astronomically
relevant temperatures ranging from 12 to 28 K. The use of reflection absorption
infrared spectroscopy (RAIRS) permits derivation of reaction rates and shows
efficient formation of H2O (D2O) with a rate that is surprisingly independent
of temperature. This formation route converts O2 into H2O via H2O2 and is found
to be orders of magnitude more efficient than previously assumed. It should
therefore be considered as an important channel for interstellar water ice
formation as illustrated by astrochemical model calculations.


title:
Entanglement of the orbital angular momentum states of the photons
  generated in a hot atomic ensemble

abstract:
  Quantum protocols will be more efficient with high-dimensional entangled
states. Photons carrying orbital angular momenta can be used to create a
high-dimensional entangled state. In this paper we experimentally demonstrate
the entanglement of the orbital angular momentum between the Stokes and
anti-Stokes photons generated in a hot atomic ensemble using spontaneous
four-wave-mixing. This experiment also suggests the existence of the
entanglement concerned with spatial degrees of freedom between the hot atomic
ensemble and the Stokes photon.


title: Isochronicity conditions for some real polynomial systems

abstract:
  This paper focuses on isochronicity of linear center perturbed by a
polynomial. Isochronicity of a linear center perturbed by a degree four and
degree five polynomials is studied, several new isochronous centers are found.
For homogeneous isochronous perturbations, a first integral and a linearizing
change of coordinates are presented. Moreover, a family of Abel polynomial
systems is also considered. By investigations until degree 10 we prove the
existence of a unique isochronous center. These results are established using a
computer implementation based on Urabe theorem.


title: TeV Scale Lee-Wick Fields out of Large Extra Dimensional Gravity

abstract:
  We study the gravitational corrections to the Maxwell, Dirac and Klein-Gorden
theories in the large extra dimension model in which the gravitons propagate in
the (4+n)-dimensional bulk, while the gauge and matter fields are confined to
the four-dimensional world. The corrections to the two-point Green's functions
of the gauge and matter fields from the exchanges of virtual Kaluza-Klein
gravitons are calculated in the gauge independent background field method. In
the framework of effective field theory, we show that the modified one-loop
renormalizable Lagrangian due to quantum gravitational effects contains a TeV
scale Lee-Wick partner of every gauge and matter field as extra degrees of
freedom in the theory. Thus the large extra dimension model of gravity provides
a natural mechanism to the emergence of these exotic particles which were
recently used to construct an extension of the Standard Model.


title:
Canonical, Lie-algebraic and quadratic twist deformations of Galilei
  group

abstract:
  New Galilei quantum groups dual to the Hopf algebras proposed in [1] are
obtained by the nonrelativistic contraction procedures. The corresponding
Lie-algebraic and quadratic quantum space-times are identified with the
translation sectors of considered algebras.


title: Anomalous Coulomb drag in electron-hole bilayers

abstract:
  We report Coulomb drag measurements on GaAs-AlGaAs electron-hole bilayers.
The two layers are separated by a 10 or 25nm barrier. Below T$\approx$1K we
find two features that a Fermi-liquid picture cannot explain. First, the drag
on the hole layer shows an upturn, which may be followed by a downturn. Second,
the effect is either absent or much weaker in the electron layer, even though
the measurements are within the linear response regime. Correlated phases have
been anticipated in these, but surprisingly, the experimental results appear to
contradict Onsager's reciprocity theorem.


title:
Enhancement of Jc by Hf -Doping in the Superconductor MgB2: A Hyperfine
  Interaction Study

abstract:
  Measurements of the critical current density (Jc) by magnetization and the
upper critical field (Hc2) by magnetoresistance have been performed for
hafnium-doped MgB2. There has been a remarkable enhancement of Jc as compared
to that by ion irradiation without any appreciable decrease in Tc, which is
beneficial from the point of view of applications. The irreversibility line
extracted from Jc shows an upward shift. In addition, there has been an
increase in the upper critical field which indicates that Hf partially
substitutes for Mg. Hyperfine interaction parameters obtained from time
differential perturbed angular correlation (TDPAC) measurements revealed the
formation of HfB and HfB2 phases along with the substitution of Hf. A possible
explanation is given for the role of these species in the enhancement of Jc in
MgB2 superconductor.


title:
A microscopic three-cluster model with nuclear polarization applied to
  the resonances of 7Be and the reaction 6Li(p,3He)4He

abstract:
  A microscopic model for three-cluster configurations in light nuclei is
presented. It uses an expansion in terms of Faddeev components for which the
dynamic eqations are derived. The model is designed to investigate binary
channel processes in a compound system. Gaussian and oscillator bases are used
to expand the wave function and to represent appropriate boundary conditions.
We study the effect of cluster polarization on ground and resonance states of
7Be, and on the astrophysical S-factor of the reaction 6Li(p,3He)4He.


title: The Stellar Populations of Lyman Break Galaxies at $z\sim5$

abstract:
  We present the results of Spectral Energy Distribution (SED) fitting analysis
for Lyman Break Galaxies (LBGs) at $z\sim5$ in the GOODS-N and its flanking
fields. From the SED fitting for $\sim100$ objects, we found that the stellar
masses range from $10^{8}$ to $10^{11}M_{\odot}$ with a median value of
$4\times10^{9}M_{\odot}$. By using the large sample of galaxies at $z\sim5$, we
construct the stellar mass function (SMF) with incompleteness corrections. By
integrating down to $10^{8}M_{\odot}$, the cosmic stellar mass density at
$z\sim5$ is calculated to be $7\times10^{6}M_{\odot}\textrm{Mpc}^{-3}$.


title:
Evolution of Star-forming Galaxies seen from Lyman Break Galaxies at
  $z\sim5$

abstract:
  Properties of Lyman Break Galaxies at $z\sim5$ are presented and are compared
with those at $z\sim 2-3$ LBGs to see evolution of LBGs from $z\sim5$ to $z
\sim3-2$. The LBGs at $z\sim5$ are tend to have smaller stellar masses, but
they may show large star formation rates and specific star formation rates.


title: Control of light speed: From slow light to superluminal light

abstract:
  A scheme for controlling light speed from slower-than-c to faster-than-c in
an atomic system is presented in this paper. The scheme is based on far
detuning Raman effect. Two far detuning coupling fields with small frequency
difference will produce two absorptive peaks for the probe field in a $\Lambda$
structure, and an optical pump between the two ground states can change the
absorptive peaks into enhanced peaks, which makes the normal dispersion between
the two peaks change into anomalous dispersion, so the probe field can change
from slow light to superluminal propagation.


title: The Dynamics of Probabilistic Population Protocols

abstract:
  We study here the dynamics (and stability) of Probabilistic Population
Protocols, via the differential equations approach. We provide a quite general
model and we show that it includes the model of Angluin et. al. in the case of
very large populations. For the general model we give a sufficient condition
for stability that can be checked in polynomial time. We also study two
interesting subcases: (a) protocols whose specifications (in our terms) are
configuration independent. We show that they are always stable and that their
eventual subpopulation percentages are actually a Markov Chain stationary
distribution. (b) protocols that have dynamics resembling virus spread. We show
that their dynamics are actually similar to the well-known Replicator Dynamics
of Evolutionary Games. We also provide a sufficient condition for stability in
this case.


title: The Faraday effect revisited: Thermodynamic limit

abstract:
  This paper is the second in a series revisiting the (effect of) Faraday
rotation. We formulate and prove the thermodynamic limit for the transverse
electric conductivity of Bloch electrons, as well as for the Verdet constant.
  The main mathematical tool is a regularized magnetic and geometric
perturbation theory combined with elliptic regularity and Agmon-Combes-Thomas
uniform exponential decay estimates.

categories: cond-mat.mes-hall astro-ph math-ph math.MP


title: An elementary proof of the Briancon-Skoda theorem

abstract:
  We give a new elementary proof of the Brian\c{c}on-Skoda theorem, which
states that for an $m$-generated ideal $\mathfrak{a}$ in the ring of germs of
analytic functions at $0\in \C^n$, the $\nu$:th power of its integral closure
is contained in $\mathfrak{a}$, where $\nu = \min(m,n)$.


title: Deposition dynamics of Na monomers and dimers on an Ar(001) substrate

abstract:
  We study deposition dynamics of Na and Na$_2$ on an Ar substrate, both
species neutral as well as charged. The system is modeled by a hierarchical
approach describing the Na valence electrons by time-dependent
density-functional theory while Na core, Ar atoms and their dynamical
polarizability are treated by molecular dynamics. We explore effects of Na
charge and initial kinetic energy of the impinging Na system. We find that
neutral Na is captured into a loosely bound adsorbate state for sufficiently
low impact energy. The charged monomers are more efficiently captured and the
cation Na$^+$ even penetrates the surface layer. For charged dimers, we come to
different final configurations depending on the process, direct deposit of
Na$_2^+$ as a whole, or sequential deposit. In any case, charge dramatically
amplifies the excitation of the matrix, in particular at the side of the Ar
dipoles. The presence of a charge also enhances the binding to the surface and
favours accumulation of larger compounds.


title:
Exciton many-body effects through infinite series of composite-exciton
  operators

abstract:
  We revisit the approach proposed by Mukamel and coworkers to describe
interacting excitons through infinite series of composite-boson operators for
both, the system Hamiltonian and the exciton commutator -- which, in this
approach, is properly kept different from its elementary boson value. Instead
of free electron-hole operators, as used by Mukamel's group, we here work with
composite-exciton operators which are physically relevant operators for excited
semiconductors. This allows us to get \emph{all} terms of these infinite series
explicitly, the first terms of each series agreeing with the ones obtained by
Mukamel's group when written with electron-hole pairs. All these terms nicely
read in terms of Pauli and interaction scatterings of the composite-exciton
many-body theory we have recently proposed. However, even if knowledge of these
infinite series now allows to tackle $N$-body problems, not just 2-body
problems like third order nonlinear susceptibility $\chi^{(3)}$, the necessary
handling of these two infinite series makes this approach far more complicated
than the one we have developed and which barely relies on just four
commutators.


title: Computation of current cumulants for small nonequilibrium systems

abstract:
  We analyze a systematic algorithm for the exact computation of the current
cumulants in stochastic nonequilibrium systems, recently discussed in the
framework of full counting statistics for mesoscopic systems. This method is
based on identifying the current cumulants from a Rayleigh-Schrodinger
perturbation expansion for the generating function. Here it is derived from a
simple path-distribution identity and extended to the joint statistics of
multiple currents. For a possible thermodynamical interpretation, we compare
this approach to a generalized Onsager-Machlup formalism. We present
calculations for a boundary driven Kawasaki dynamics on a one-dimensional
chain, both for attractive and repulsive particle interactions.


title: Discovery of a Circumbinary Disk around Herbig Ae/Be system v892 Tau

abstract:
  We report the discovery of a circumbinary disk around the Herbig Ae/Be system
v892 Tau. Our detailed mid-infrared images were made using segment-tilting
interferometry on the Keck-1 Telescope and reveal an asymmetric disk inclined
at ~60 degs with an inner hole diameter of 250 mas (35 AU), approximately 5X
larger than the apparent separation of the binary components. In addition, we
report a new measurement along the binary orbit using near-infrared Keck
aperture masking, allowing a crude estimate of orbital parameters and the
system mass for the first time. The size of the inner hole appears to be
consistent with the minimum size prediction from tidal truncation theory,
bearing a resemblance to the recently unmasked binary CoKu Tau/4. Our results
have motivated a re-analysis of the system spectral energy distribution,
concluding the luminosity of this system has been severely underestimated. With
further study and monitoring, v892 Tau should prove a powerful testing ground
for both predictions of dynamical models for disk-star interactions in young
systems with gas-rich disks and for calibrations of pre-main-sequence tracks
for intermediate-mass stars.


title: Nonhomogeneous analytic families of trees

abstract:
  We consider a dichotomy for analytic families of trees stating that either
there is a colouring of the nodes for which all but finitely many levels of
every tree are nonhomogeneous, or else the family contains an uncountable
antichain. This dichotomy implies that every nontrivial Souslin poset
satisfying the countable chain condition adds a splitting real.
  We then reduce the dichotomy to a conjecture of Sperner Theory. This
conjecture is concerning the asymptotic behaviour of the product of the sizes
of the m-shades of pairs of cross-t-intersecting families.


title: Measurement of CP asymmetry in Cabibbo suppressed D0 decays

abstract:
  We measure the CP-violating asymmetries in decays to the D0 -> K+K- and D0 ->
pi+pi- CP eigenstates using 540 fb^{-1} of data collected with the Belle
detector at or near the Upsilon(4S) resonance. Cabibbo-favored D0 -> K-pi+
decays are used to correct for systematic detector effects. The results,
A_{CP}^{KK} = (-0.43 +- 0.30 +- 0.11)% and A_{CP}^{pipi} = (+0.43 +- 0.52 +-
0.12)%, are consistent with no CP violation.


title: Charged Lepton-Flavor Violation in Beyond-Standard Models

abstract:
  I discuss charged lepton-flavor violation in physics beyond the standard
model and review topics related to it.


title: Tricritical point of J1-J2 Ising model on hyperbolic lattice

abstract:
  A ferromagnetic-paramagnetic phase transition of the two-dimensional
frustrated Ising model on a hyperbolic lattice is investigated by use of the
corner transfer matrix renormalization group method. The model contains
ferromagnetic nearest-neighbor interaction J_1 and the competing
antiferromagnetic interaction J_2. A mean-field like second-order phase
transition is observed when the ratio \kappa = J_2 / J_1 is less than 0.203. In
the region 0.203 < \kappa < 1/4, the spontaneous magnetization is discontinuous
at the transition temperature. Such tricritical behavior suggests that the
phase transitions on hyperbolic lattices need not always be mean-field like.


title: Ultra High Energy Nuclei Propagation

abstract:
  We discuss the problem of ultra high energy nuclei propagation in
astrophysical backgrounds. We present a new analytical computation scheme based
on the hypothesis of continuos energy losses in a kinetic formulation of the
particles propagation. This scheme enables the computation of the fluxes of
ultra high energy nuclei as well as the fluxes of secondaries (nuclei and
nucleons) produced by the process of photo-disintegration suffered by nuclei.


title: [OIII] emitters in the field of the MRC 0316-257 protocluster

abstract:
  Venemans et al. (2005) found evidence for an overdensity of Ly-alpha emission
line galaxies associated with the radio galaxy MRC 0316-257 at z=3.13
indicating the presence of a massive protocluster. Here, we present the results
of a search for additional star-forming galaxies and AGN within the
protocluster. Narrow-band infrared imaging was used to select candidate [O III]
emitters in a 1.1 x 1.1 Mpc^2 region around the radio galaxy. Thirteen
candidates have been detected. Four of these are among the previously confirmed
sample of Ly-alpha galaxies, and an additional three have been confirmed
through follow-up infrared spectroscopy. The three newly confirmed objects lie
within a few hundred km/s of each other, but are blueshifted with respect to
the radio galaxy and Ly-alpha emitters by ~2100 km/s. Although the sample is
currently small, our results indicate that the radio-selected protocluster is
forming at the centre of a larger, ~60 co-moving Mpc super-structure. On the
basis of an HST/ACS imaging study we calculate dust-corrected star-formation
rates and investigate morphologies and sizes of the [O III] candidate emitters.
From a comparison of the star formation rate derived from UV-continuum and [O
III] emission, we conclude that at least two of the [O III] galaxies harbour an
AGN which ionized the O+ gas.


title:
Photo-current and photo-voltage oscillations in the two-dimensional
  electron system: screening and "anti-screening" of a potential profile

abstract:
  We observe in state-of-the-art GaAs based 2D electron systems microwave
induced photo-current and photo-voltage oscillations around zero as a function
of the applied magnetic field. The photo-signals pass zero whenever the
microwave frequency is close to a multiple of the cyclotron resonance
frequency. They originate from built-in electric fields due to for instance
band bending at contacts. The oscillations correspond to a suppression
(screening) or an enhancement ("anti-screening") of these fields by the
photo-excited electrons.


title:
Sur Les Suites D'Interpolation Pour Les Espaces De Bergman a Poids Dans
  la Boule De $\mathbb{C}^n$}

abstract:
  Let $A$ be a sequence of points of $\mathbb{B}^n$ the unit ball in
$\mathbb{C}^n.$ In terms of interpolating vectorial function (or Amar's
function)[1], we give a necessary condition on $A$ to be interpolating for the
weighted Bergman space $B^p_\alpha (\mathbb{B}^n). In the particular case of
Hardy space $H^p (\mathbb{B}^2)$, this condition is sufficient no optimal. In
the main theorem proof, we resolve Gleason's problem (vectorial form) in
$B^p_\alpha (\mathbb{B}^n)$


title:
On the unitarization of linear representations of primitive partially
  ordered sets

abstract:
  We describe all weights which are appropriated for the unitarization of
linear representations of primitive partially ordered sets of finite type.


title:
Reduction and reconstruction aspects of second-order dynamical systems
  with symmetry

abstract:
  We examine the reduction process of a system of second-order ordinary
differential equations which is invariant under a Lie group action. With the
aid of connection theory, we explain why the associated vector field decomposes
in three parts and we show how the integral curves of the original system can
be reconstructed from the reduced dynamics. An illustrative example confirms
the results.


title:
Evanescent wave transport and shot noise in graphene: ballistic regime
  and effect of disorder

abstract:
  We have investigated electrical transport and shot noise in graphene field
effect devices. In large width over length ratio $W/L$ graphene strips, we have
measured shot noise at low frequency ($f$ = 600--850 MHz) in the temperature
range of 4.2--30 K. We observe a minimum conductivity of $\frac{4e^{2}}{\pi h}$
and a finite and gate dependent Fano factor reaching the universal value of 1/3
at the Dirac point, i.e. where the density of states vanishes. These findings
are in good agreement with the theory describing that transport at the Dirac
point should occur via evanescent waves in perfect graphene samples with large
$W/L$. Moreover, we show and discuss how disorder and non-parallel leads affect
both conductivity and shot noise.


title:
Primary and reciprocal space-time experiments, relativistic reciprocity
  relations and Einstein's train-embankment thought experiment

abstract:
  The concepts of primary and reciprocal experiments and base and travelling
frames in special relativity are concisely described and applied to several
different space-time experiments. These include Einstein's train/embankment
thought experiment and a related thought experiment, due to Sartori, involving
two trains in parallel motion with different speeds. Spatially separated clocks
which are synchronised in their common proper frame are shown to be so in all
inertial frames and their spatial separation to be Lorentz invariant. The
interpretions given by Einstein and Sartori of their experiments, as well as
those given by the present author in previous papers, are shown to be
erroneous.


title: Fitting DVCS amplitude in moment-space approach to GPDs

abstract:
  We describe small-x_Bj deeply virtual Compton scattering measurements at HERA
in terms of generalized parton distributions at leading order of perturbation
series.


title: Loop Quantum Cosmology corrections to inflationary models

abstract:
  In the recent years the quantization methods of Loop Quantum Gravity have
been successfully applied to the homogeneous and isotropic
Friedmann-Robertson-Walker space-times. The resulting theory, called Loop
Quantum Cosmology (LQC), resolves the Big Bang singularity by replacing it with
the Big Bounce. We argue that LQC generates also certain corrections to field
theoretical inflationary scenarios. These corrections imply that in the LQC the
effective sonic horizon becomes infinite at some point after the bounce and
that the scale of the inflationary potential implied by the COBE normalisation
increases. The evolution of scalar fields immediately after the Bounce becomes
modified in an interesting way. We point out that one can use COBE
normalisation to establish an upper bound on the quantum of length of LQG.


title: Increase of Software Safety

abstract:
  New model of software safety is offered. Distribution of mistakes in program
on stages of life cycle is researched. Study of ways of increase of reliability
of software at help simulation program is leaded.


title:
Intrinsic Absorption Properties in Active Galaxies Observed with the Far
  Ultraviolet Spectroscopic Explorer

abstract:
  In a continuing survey of active galactic nuclei observed by the Far
Ultraviolet Spectroscopic Explorer, we provide a deeper analysis of intrinsic
absorption features found in 35 objects. Our survey is for low-redshift and
moderate-luminosity objects, mostly Seyfert galaxies. We find a strong
correlation between maximum radial velocity and luminosity. We also examine the
relationships between equivalent width (EW), full width at half maximum,
velocity: and continuum flux. The correlation between velocity and luminosity
has been explored previously by Laor & Brandt, but at a significantly higher
redshift and heavily weighted by broad absorption line quasars. We also have
examined each object with multiple observations for variability in each of the
aforementioned quantities, and have characterized the variation of EW with the
continuum flux. In our survey, we find that variability of O VI lambda1032,
lambda1038 is less common than of the UV doublets of CIV and N V seen at longer
wavelengths, because the O VI absorption is usually saturated. Lyman beta
absorption variability is more frequent. In a target-by-target examination we
find that broad absorption line absorption and narrow absorption line absorbers
are related in terms of maximum outflow velocity and luminosity, and both can
be exhibited in similar luminosity objects. We also find one object that shows
radial velocity change, seven objects that show equivalent width variability,
and two objects that show either transverse velocity changes or a change in
ionization.


title: Three-Algebras and N=6 Chern-Simons Gauge Theories

abstract:
  We derive the general form for a three-dimensional scale-invariant field
theory with N=6 supersymmetry, SU(4) R-symmetry and a U(1) global symmetry. The
results can be written in terms of a 3-algebra in which the triple product is
not antisymmetric. For a specific choice of 3-algebra we obtain the N=6
theories that have been recently proposed as models for M2-branes in an R^8/Z_k
orbifold background.


title: Imaging the dense stellar cluster R136 with VLT-MAD

abstract:
  We evaluate the performance of the Multi-conjugate Adaptive optics
Demonstrator (MAD) from H and Ks imaging of 30 Doradus in the Large Magellanic
Cloud. Maps of the full-width half maximum (FWHM) of point sources in the H and
Ks images are presented, together with maps of the Strehl ratio achieved in the
Ks-band observations. Each of the three natural guide stars was at the edge of
the MAD field-of-view, and the observations were obtained at relatively large
airmass (1.4-1.6). Even so, the Strehl ratio achieved in the second pointing
(best-placed compared to the reference stars) ranged from 15% to an impressive
30%. Preliminary photometric calibration of the first pointing indicates 5
sigma sensitivities of Ks=21.75 and H=22.25 (from 22 and 12 min exposures,
respectively).


title:
Plasma Kinetics in Electrical Discharge in Mixture of Air, Water and
  Ethanol Vapors for Hydrogen Enriched Syngas Production

abstract:
  The complex theoretical and experimental investigation of plasma kinetics of
the electric discharge in the mixture of air and ethanol-water vapors is
carried out. The discharge was burning in the cavity, formed by air jets
pumping between electrodes, placed in aqueous ethanol solution. It is found out
that the hydrogen yield from the discharge is maximal in the case when ethanol
and water in the solution are in equal amounts. It is shown that the hydrogen
production increases with the discharge power and reaches the saturation at
high value. The concentrations of the main stable gas-phase components,
measured experimentally and calculated numerically, agree well in the most
cases.


title: The Sivers Function from SIDIS Data

abstract:
  We study the Sivers effect in transverse single spin asymmetries (SSA) for
pion and kaon production in Semi-Inclusive Deep Inelastic Scattering (SIDIS)
processes. We perform a fit of A^{sin(phi_h-phi_S)}_UT taking into account the
recent data from HERMES and COMPASS Collaborations, which allow a new
determination of the Sivers distribution functions for quark and anti-quark
with u, d and also s flavours. Estimates for forthcoming SIDIS experiments at
COMPASS and JLab are given.


title: Classifying Camina groups: a theorem of Dark and Scoppola

abstract:
  Recall that a group $G$ is a Camina group if every nonlinear irreducible
character of $G$ vanishes on $G \setminus G'$. Dark and Scoppola classified the
Camina groups that can occur. We present a different proof of this
classification using Theorem 2, which strengthens a result of Isaacs on Camina
pairs. Theorem 2 is of independent interest.


title:
A conjecture on homotopy groups of spheres, details on the algebra of
  higher cohomology operations

abstract:
  The theory of secondary chomology operations leads to a conjecture concerning
the algebra of higher cohomology operations in general. This conjecture is
discussed here in detail and its connection with homotopy groups of spheres and
the Adams spectral sequence is described.


title: Properties of Design-Based Functional Principal Components Analysis

abstract:
  This work aims at performing Functional Principal Components Analysis (FPCA)
with Horvitz-Thompson estimators when the observations are curves collected
with survey sampling techniques. One important motivation for this study is
that FPCA is a dimension reduction tool which is the first step to develop
model assisted approaches that can take auxiliary information into account.
FPCA relies on the estimation of the eigenelements of the covariance operator
which can be seen as nonlinear functionals. Adapting to our functional context
the linearization technique based on the influence function developed by
Deville (1999), we prove that these estimators are asymptotically design
unbiased and consistent. Under mild assumptions, asymptotic variances are
derived for the FPCA' estimators and consistent estimators of them are
proposed. Our approach is illustrated with a simulation study and we check the
good properties of the proposed estimators of the eigenelements as well as
their variance estimators obtained with the linearization approach.


title: GPD sum rules: a tool to reveal the quark angular momentum

abstract:
  In deeply virtual exclusive electroproduction to leading order accuracy one
accesses generalized parton distributions on their cross-over trajectory.
Combining Lorentz covariance and analyticity leads to a family of GPD sum
rules, guiding us to phenomenological concepts. As an example, we discuss the
constraints from the JLAB/Hall A data on the GPD $E$. Its first Mellin moment
is the anomalous gravitomagnetic moment, which is the unknown contribution to
the quark angular momentum.


title: Une minoration du minimum essentiel sur les varietes abeliennes

abstract:
  We extend to the general codimension a lower bound for the essential minimum
on abelian varieties found in a previous work, under a conjecture about
ordinary primes in abelian varieties. This lower bound is the best expected,
``up to an epsilon'', in the degree of the subvariety. Following a strategy of
Amoroso, we change the transcendance phasis in order to simplify the zero lemma
and its combinatorics. The last argument is a descent procedure on varieties,
which is far more intricate in the abelian setting since there is not, in
general, a lifting of the Frobenius in characteristic zero.


title: (Pseudo-) Scalar Operators in the MSSM and B to phi K^*, K eta(') Decays

abstract:
  We study the effect of b to s sbar s scalar/pseudoscalar operators,
originating from penguin diagrams of neutral Higgs bosons in the MSSM, in B to
K eta(') and B to phi K^* decays. These operators can be Fierz-transformed into
tensor operators, and the resultant tensor operators could affect the
transverse polarization amplitudes in B to phi K^* decays. We find that only
when the weak annihilations in B to phi K^* into account, the polarization
puzzle can be resolved, so that new physics effects are strongly suppressed and
no more relevant to the enhancement of the transverse modes in B to phi K^*
decays.


title:
Transversity and Collins Fragmentation Functions: Towards a New Global
  Analysis

abstract:
  A new, preliminary global analysis of the experimental data on azimuthal
asymmetries in SIDIS from HERMES and COMPASS collaborations, and in e+e- -->
h_1 h_2 X processes from the BELLE collaboration, is performed. The new data
allow for a more precise determination of the Collins fragmentation function
and of the transversity distribution function for $u$ and $d$ quarks, in
comparison with the results of our previous analysis. Estimates for the single
spin asymmetry A_UT^{\sin(\phi_h + \phi_S)} at JLab and COMPASS, operating on a
transversely polarized proton target, are presented.


title: Virtual Hadronic Corrections to Massive Bhabha Scattering

abstract:
  Virtual hadronic contributions to the Bhabha process at the NNLO level are
discussed. They are substantial for predictions with per mil accuracy. The
studies of heavy fermion and hadron corrections complete the calculation of
Bhabha virtual effects at the NNLO level.


title: Active cool stars and He I 10830 \AA: the coronal connection

abstract:
  The mechanism of formation of the He I 10830 A triplet in cool stars has been
subject of debate for the last 30 years. A relation between the X-ray
luminosity and the He I 10830 A flux was found in cool stars, but the dominant
mechanism of formation in these stars (photoionization by coronal radiation
followed by recombination and cascade, or collisional excitation in the
chromosphere), has not yet been established. We use modern instrumentation
(NOT/SOFIN) and a direct measurement of the EUV flux, which photoionizes He I,
to investigate the formation mechanism of the line for the most active stars
which are frequently excluded from analysis. We have observed with an
unprecedented resolution (R~170,000) the He I 10830 A triplet in a set of 15
stars that were also observed with the Extreme Ultraviolet Explorer (EUVE) in
order to compare the line strengths with their EUV and X-ray fluxes. Active
dwarf and subgiant stars do not exhibit a relation between the EUV flux and the
equivalent width of the He I 10830 A line. Giant stars however, show a positive
correlation between the strength of the He I 10830 A absorption and the EUV and
X-ray fluxes. The strength of the C IV 1550 A emission does not correlate with
coronal fluxes in this sample of 15 stars. Active dwarf stars may have high
chromospheric densities thus allowing collisional excitation to dominate
photoionization/recombination processes in forming the He I 10830 A line.
Active giant stars possess lower gravities, and lower chromospheric densities
than dwarfs, allowing for photoexcitation processes to become important.
Moreover, their extended chromospheres allowfor scattering of infrared
continuum radiation, producing strong absorption in He I and tracing wind
dynamics.


title:
Molecular gas and dust in Arp 94: The formation of a recycled galaxy in
  an interacting system

abstract:
  We present new results for the molecular gas, dust emission and the ionized
gas in J1023+1952, an HI rich intergalactic star-forming tidal dwarf galaxy
candidate. It is located at the projected intersection of two faint stellar
tidal streams wrapped around the interacting pair of galaxies NGC 3227/6
(Arp~94). Using the IRAM 30m telescope, emission from CO(1-0) and CO(2-1) was
detected across the entire extent of the neutral hydrogen cloud associated with
J1023+1952, a region of the size of 8.9$ x 5.9 kpc, as well as in the nuclear
region and outer disk of NGC 3227. The molecular gas is found to be abundant
over the entire HI cloud, with H2-to-HI gas mass ratios between 0.5 and 1.7.
New Spitzer mid-infrared observations at 3.6, 4.5, 5.8, 8.0, 15 and 24mu show
that young SF is restricted to the southern part of the cloud. Despite the
relatively uniform H$_2$ and HI column density across the cloud, young SF
occurs only where the velocity dispersion in the CO and HI is a factor of
$\sim$two lower (FWHM of 30 - 70 \kms) than elsewhere in the cloud (FWHM of 80
- 120 \kms). Thus the kinematics of the gas, in addition to its column density,
seems to be a crucial factor in triggering SF. Optical/infrared spectral energy
distributions (SEDs) and Halpha photometry confirm that all the knots are
young, with a tentative age sequence from the south-west (oldest knots) to the
north-east (youngest). Optical spectroscopy of the brightest SF region allowed
us to determine the metallicity (12+log(O/H) = 8.6 +- 0.2) and the extinction
($A_B$=2.4). This shows that J1023+1952 is made from metal-enriched gas which
is inconsistent with the hypothesis that it represents a pre-existing dwarf
galaxy. Instead, it must be formed from recycled, metal-enrichd gas, expelled
from NGC 3227 or NGC 3226 in a previous phase of the interaction.


title: Cavity Enhanced Spin Measurement of an NV Centre in Diamond

abstract:
  We propose a high efficiency high fidelity measurement of the ground state
spin of a single NV center in diamond, using the effects of cavity quantum
electrodynamics. The scheme we propose is based in the one dimensional atom or
Purcell regime, removing the need for high Q cavities that are challenging to
fabricate. The ground state of the NV center consists of three spin levels
$^{3}A_{(m=0)}$ and $^{3}A_{(m=\pm1)}$ (the $\pm1$ states are near degenerate
in zero field). These two states can undergo transitions to the excited
($^{3}E$) state, with an energy difference of $\approx7-10$ $\mu$eV between the
two. By choosing the correct Q factor, this small detuning between the two
transitions results in a dramatic change in the intensity of reflected light.
We show the change in reflected intensity can allow us to read out the ground
state spin using a low intensity laser with an error rate of
$\approx5.5\times10^{-3}$, when realistic cavity and experimental parameters
are considered. Since very low levels of light are used to probe the state of
the spin we limit the number of florescence cycles, thereby limiting the non
spin preserving transitions through the intermediate singlet state $^{1}A$.


title: Riemann geometry in theory of the first order systems of equations

abstract:
  Theory of Riemann Extensions of the spaces with constant affine connection
for the studying of the properties of nonlinear the first order systems of
differential equations is proposed. Quadratic planar system of equations and
the Lorenz system of equations are investigated in detail.


title: The variable super-orbital modulation of Cygnus X-1

abstract:
  We study the super-orbital modulation present in the Cygnus X-1 X-ray data,
usually attributed to the precession of the accretion disk and relativistic
jets. We find a new, strong, 326+-2 d period modulation starting in 2005, in
Swift/BAT and RXTE/ASM light curves (LCs). We also investigate Vela5B/ASM and
ArielV/ASM archival data and confirm the previously reported ~290 d periodic
modulation, and therefore confirming that the super-orbital period is not
constant. Finally, we study RXTE/ASM LC before 2005 and find that the
previously reported ~150 d period is most likely an artifact due to the use of
a Fourier-power based analysis under the assumption that the modulation has a
constant period along the whole data sample. Instead, we find strong
indications of several discrete changes of the precession period, happening in
coincidence with soft and failed state-transition episodes. We also find a hint
of correlation between the period and the amplitude of the modulation. The
detection of gamma-rays above 100 GeV with MAGIC in September 2006 happened in
coincidence with a maximum of the super-orbital modulation. The next maximum
will happen between 2 and 14 of July 2008, when the observational conditions of
Cygnus X-1 with ground-based Cherenkov telescopes, such as MAGIC and VERITAS,
are optimal.


title: Large non-Gaussianity from multi-brid inflation

abstract:
  A model of multi-component hybrid inflation, dubbed multi-brid inflation, in
which various observable quantities including the non-Gaussianity parameter
f_{NL} can be analytically calculated was proposed recently. In particular, for
a two-brid inflation model with an exponential potential and the condition that
the end of inflation is an ellipse in the field space, it was found that, while
keeping the other observational quantities within the range consistent with
observations, large non-Gaussianity is possible for certain inflationary
trajectories, provided that the ratio of the two masses is large. One might
question whether the resulting large non-Gaussianity is specific to this
particular form of the potential and the condition for the end of inflation. In
this paper, we consider a model of multi-brid inflation with a potential given
by an exponential function of terms quadratic in the scalar field components.
We also consider a more general class of ellipses for the end of inflation than
those studied previously. Then, focusing on the case of two-brid inflation, we
find that large non-Gaussianity is possible in the present model even for the
equal-mass case. Then by tuning the model parameters, we find that there exist
models for which both the non-Gaussianity and the tensor-to-scalar ratio are
large enough to be detected in the very near future.


title: On the algebraic types of the Bel-Robinson tensor

abstract:
  The Bel-Robinson tensor is analyzed as a linear map on the space of the
traceless symmetric tensors. This study leads to an algebraic classification
that refines the usual Petrov-Bel classification of the Weyl tensor. The new
classes correspond to degenerate type I space-times which have already been
introduced in literature from another point of view. The Petrov-Bel types and
the additional ones are intrinsically characterized in terms of the sole
Bel-Robinson tensor, and an algorithm is proposed that enables the different
classes to be distinguished. Results are presented that solve the problem of
obtaining the Weyl tensor from the Bel-Robinson tensor in regular cases.


title: The mapping class group cannot be realized by homeomorphisms

abstract:
  Let $M$ be a closed surface. By $\Homeo(M)$ we denote the group of
orientation preserving homeomorphisms of $M$ and let $\MC(M)$ denote the
Mapping class group. In this paper we complete the proof of the conjecture of
Thurston that says that for any closed surface $M$ of genus $\g \ge 2$, there
is no homomorphic section $\E:\MC(M) \to \Homeo(M)$ of the standard projection
map $\Proj:\Homeo(M) \to \MC(M)$.


title:
Mobility in Semiconducting Graphene Nanoribbons: Phonon, Impurity, and
  Edge Roughness Scattering

abstract:
  The transport properties of carriers in semiconducting graphene nanoribbons
are studied by comparing the effects of phonon, impurity, and line-edge
roughness scattering. It is found that scattering from impurities located at
the surface of nanoribbons, and from acoustic phonons are as important as line
edge roughness scattering. The relative importance of these scattering
mechanisms varies with the temperature, Fermi level location, and the width of
the ribbons. Based on the analysis, strategies for improvement of low-field
mobility are described.


title: Covers of surfaces with fixed branch locus

abstract:
  Given a connected smooth projective surface X over the complex numbers,
together with a simple normal crossings divisor D on it, we study finite normal
covers Y of X that are unramified outside D. Given moreover a fibration of X
onto a curve C, we prove that the `height' of Y over C is bounded linearly in
terms of the degree of Y over X. We indicate how an arithmetic analogue of this
result, if true, can be auxiliary in proving the existence of a polynomial time
algorithm that computes the mod-l Galois representations associated to a given
smooth projective geometrically connected surface over the rational numbers. A
precise conjecture is formulated.


title: Series expansions of the density of states in SU(2) lattice gauge theory

abstract:
  We calculate numerically the density of states n(S) for SU(2) lattice gauge
theory on $L^4$ lattices. Small volume dependence are resolved for small values
of S. We compare $ln(n(S))$ with weak and strong coupling expansions.
Intermediate order expansions show a good overlap for values of S corresponding
to the crossover. We relate the convergence of these expansions to those of the
average plaquette. We show that when known logarithmic singularities are
subtracted from $ln(n(S))$, expansions in Legendre polynomials appear to
converge and could be suitable to determine the Fisher's zeros of the partition
function.


title: Generalized transformation optics from triple spacetime metamaterials

abstract:
  In this paper various extensions of the design strategy of transformation
media are proposed. We show that it is possible to assign different transformed
spaces to the field strength tensor (electric field and magnetic induction) and
to the excitation tensor (displacement field and magnetic field), resp. In this
way, several limitations of standard transformation media can be overcome. In
particular it is possible to provide a geometric interpretation of
non-reciprocal as well as indefinite materials. We show that these
transformations can be complemented by a continuous version of
electric-magnetic duality and comment on the relation to the complementary
approach of field-transforming metamaterials.


title:
Light matter in the core of the Earth: its identity, quantity and
  temperature using tricritical phenomena

abstract:
  Light elements in the iron-rich core of the Earth are important indicators
for the evolution of our planet. Their amount and distribution, and the
temperature in the core, are essential for understanding how the core and the
mantle interact and for modelling the geodynamo which generates the planetary
magnetic field. However, there is a longstanding controversy surrounding the
identity and quantity of the light elements. Here, the theory of tricritical
phenomena is employed as a precise theoretical framework to study
solidification at the high pressures and temperatures where both experimental
and numerical methods are complicated to implement and have large uncertainties
in their results. Combining the theory with the most reliable iron melting data
and the Preliminary Reference Earth Model (PREM) seismic data, one obtains the
solidification temperature at the inner core boundary (ICB) for both pure iron
and for the alloy of iron and light elements in the actual core melt. One also
finds a value of about 2.5 mole% for the amount of light matter. In addition,
the density of both solid and liquid pure iron at its melting temperature is
found. This allows one to obtain the density of the light matter and thus to
identify it to be MgSiO3.


title: Top BSM at D0

abstract:
  The D0 experiment has searched for phenomena beyond the standard model in top
quark events. The methods and results of four analyses covering various
possible deviations from the standard model behaviour are discussed. With data
sets covering up to 2.1fb^-1 no deviation from the standard model expectations
could be found.


title:
GALEX Observations of Diffuse UV Radiation at High Spatial Resolution
  from the Sandage Nebulosity

abstract:
  Using the GALEX ultraviolet imagers we have observed a region of nebulosity
first identified as starlight scattered by interstellar dust by Sandage (1976).
Apart from airglow and zodiacal emission, we have found a diffuse UV background
of between 500 and 800 \phunit in both the \galex FUV (1350 -- 1750 \AA) and
NUV (1750 -- 2850 \AA). Of this emission, up to 250 \phunit is due to \htwo
fluorescent emission in the FUV band; the remainder is consistent with
scattering from interstellar dust. We have estimated the optical constants to
be $a = 0.3; g = 0.7$ in the FUV and $a = 0.5; g = 0.7$ in the NUV, implying
highly forward scattering grains, plus an extragalactic contribution of as much
as 150 \phunit. These are the highest spatial resolution observations of the
diffuse UV background to date and show an intrinsic scatter beyond that
expected from instrumental noise alone. Further modeling is required to
understand the nature of this scatter and its implications for the ISM.


title:
Moduli Stabilization in non-Supersymmetric Minkowski Vacua with
  Anomalous U(1) Symmetry

abstract:
  We study how two moduli can be stabilized in a Minkowski/de Sitter vacuum for
a wide class of string-inspired Supergravity models with an effective
Fayet-like Supersymmetry breaking. It is shown under which conditions this
mechanism can be made natural and how it can give rise to an interesting
spectrum of soft masses, with a relatively small mass difference between scalar
and gaugino masses. In absence of a constant superpotential term, the above
mechanism becomes completely natural and gives rise to a dynamical
supersymmetry breaking mechanism. Some specific type IIB and heterotic string
inspired models are considered in detail.


title: Energy dependence of the total photoproduction cross section at HERA

abstract:
  The energy dependence of the total photon-proton cross-section is determined
from data collected with the ZEUS detector at HERA with two different proton
beam energies.


title:
Experimental and theoretical evidences for an intermediate
  $\sigma$-dressed dibaryon in the NN interaction

abstract:
  Numerous theoretical and experimental arguments are presented in favor of the
generation of intermediate $\sigma$-dressed dibaryon in $NN$ interaction at
intermediate and short distances. We argue that this intermediate dibaryon can
be responsible for the strong intermediate-range attraction and the short-range
repulsion in the $NN$ interaction, and also for the short-range correlations in
nuclei. The suggested mechanism for the $\sigma$-dressing of the dibaryon is
identical to that which explains the Roper resonance structure, its dominant
decay modes and its extraordinary low mass. A similar transformation mechanism
from the glue to the scalar field was discovered in $J/\Psi$ decays. The new
experimental data on 2$\pi$-production in the scalar-isoscalar channel produced
in $pn$- and $pd$-collisions and in particular the very recent data on
$\gamma\gamma$ correlations in $p$C and $d$C scattering in the GeV region seems
to corroborate the existence of the $\sigma$-dressed dibaryon in two- and three
nucleon interactions.


title: Dimension minimization of a quantum automaton

abstract:
  A new model of a Quantum Automaton (QA), working with qubits is proposed. The
quantum states of the automaton can be pure or mixed and are represented by
density operators. This is the appropriated approach to deal with measurements
and dechorence. The linearity of a QA and of the partial trace super-operator,
combined with the properties of invariant subspaces under unitary
transformations, are used to minimize the dimension of the automaton and,
consequently, the number of its working qubits. The results here developed are
valid wether the state set of the QA is finite or not. There are two main
results in this paper: 1) We show that the dimension reduction is possible
whenever the unitary transformations, associated to each letter of the input
alphabet, obey a set of conditions. 2) We develop an algorithm to find out the
equivalent minimal QA and prove that its complexity is polynomial in its
dimension and in the size of the input alphabet.


title: Transport in Luttinger Liquids with Strong Impurities

abstract:
  The tunnel current of a Luttinger liquid with a finite density of strong
impurities is calculated using an instanton approach. For very low temperatures
$T$ or electric fields $E$ the (nonlinear) conductivity is of variable range
hopping (VRH) type as for weak pinning. For higher temperatures or fields the
conductivity shows power law behavior corresponding to a crossover from multi-
to single-impurity tunneling. For even higher $T$ and not too strong pinning
there is a second crossover to weak pinning. The determination of the position
of the various crossover lines both for strong and weak pinning allows the
construction of the global regime diagram.


title: Insensitivity of superconductivity to disorder in the cuprates

abstract:
  Using a dynamical cluster quantum Monte Carlo approximation, we investigate
the effect of local disorder on the stability of d-wave superconductivity
including the effect of electronic correlations in both particle-particle and
particle-hole channels. With increasing impurity potential, we find an initial
rise of the critical temperature due to an enhancement of anti-ferromagnetic
spin correlations, followed by a decrease of Tc due to scattering from
impurity-induced moments and ordinary pairbreaking. We discuss the weak initial
dependence of Tc on impurity concentration found in comparison to experiments
on cuprates.


title: Underdamped quantum ratchets

abstract:
  We investigate the quantum ratchet effect under the influence of weak
dissipation which we treat within a Floquet-Markov master equation approach. A
ratchet current emerges when all relevant symmetries are violated. Using
time-reversal symmetric driving we predict a purely dissipation-induced quantum
ratchet current. This directed quantum transport results from bath-induced
superpositions of non-transporting Floquet states.


title: On M5-branes in N=6 Membrane Action

abstract:
  In this note we study M5-branes in the multiple membrane action which is
recently proposed by Aharony-Bergman-Jafferis-Maldacena. We write down the N=6
supersymmetry transformation of the action and obtain 1/2 BPS equations and
their solutions. They are expected to represent membranes ending on a M5-brane.
We also consider the M5-M2 bound state in the action.


title: The HOPPET NNLO parton evolution package

abstract:
  This contribution describes the HOPPET Fortran~95 package for carrying out
DGLAP evolution and other common manipulations of PDFs. The PDFs are
represented on a grid in $x$-space so as to avoid limitations on the functional
form of input distributions. Good speed and accuracy are obtained through the
representation of splitting functions in terms of their convolution with a set
of piecewise polynomial basis functions. We briefly describe the structure of
the code and discuss its quantitative performance. Finally we comment of future
directions for the program's development.


title:
Quadratic Forms and Space-Time Block Codes from Generalized Quaternion
  and Biquaternion Algebras

abstract:
  In the context of space-time block codes (STBCs), the theory of generalized
quaternion and biquaternion algebras (i.e., tensor products of two quaternion
algebras) over arbitrary base fields is presented, as well as quadratic form
theoretic criteria to check if such algebras are division algebras. For base
fields relevant to STBCs, these criteria are exploited, via Springer's theorem,
to construct several explicit infinite families of (bi-)quaternion division
algebras. These are used to obtain new $2\x 2$ and $4\x 4$ STBCs.


title:
Deconfinement phase transition in hybrid neutron stars from the
  Brueckner theory with three-body forces and a quark model with chiral mass
  scaling

abstract:
  We study the properties of strange quark matter in equilibrium with normal
nuclear matter. Instead of using the conventional bag model in quark sector, we
achieve the confinement by a density-dependent quark mass derived from
in-medium chiral condensates. In nuclear matter, we adopt the equation of state
from the Brueckner-Bethe-Goldstone approach with three-body forces. It is found
that the mixed phase can occur, for a reasonable confinement parameter, near
the normal nuclear saturation density, and goes over into pure quark matter at
about 5 times the saturation. The onset of mixed and quark phases is compatible
with the observed class of low-mass neutron stars, but it hinders the
occurrence of kaon condensation.


title:
The ESO-Spitzer Imaging extragalactic Survey (ESIS) II: VIMOS I,z wide
  field imaging of ELAIS-S1 and selection of distant massive galaxies

abstract:
  (abridged) The ESIS survey is the optical follow up of the SWIRE/Spitzer in
the ELAIS-S1 region of the sky. In the era of observational cosmology, the main
efforts are focused on the study of galaxy evolution and its environmental
dependence. Wide area, multiwavelength, extragalactic surveys are needed in
order to probe sufficiently large volumes, minimize cosmic variance and find
significant numbers of rare objects. We present VIMOS I and z band imaging
belonging to the ESIS survey. A total of ~4 deg2 were targeted in I and ~1 deg2
in z. More than 300000 galaxies have been detected in the I band and ~50000 in
the z band. Object coordinates are defined within an uncertainty of ~0.2 arcsec
r.m.s., with respect to GSC 2.2. We reach a 90% average completeness at 23.1
and 22.5 mag (Vega) in the I and z bands, respectively. On the basis of IRAC
colors, we identified galaxies having the 1.6 um stellar peak shifted to z=1-3.
The new I, z band data provide reliable constraints to avoid low-redshift
interlopers and reinforce this selection. Roughly 1000 galaxies between z=2-3
were identified over the ESIS ~4 deg2, at the SWIRE 5.8 um depth (25.8 uJy at
3sigma). These are the best galaxy candidates to dominate the massive tail
(M>1e11 Msun) of the z>2 mass function.


title: Chiral corrections to the scalar form factor in B_q to D_q transitions

abstract:
  We consider chiral loop corrections to the scalar form factor in B_q to D_q l
nu decays. First we consider chiral corrections to the 1/m_Q suppressed
operators and then we propose the procedure for the extraction of the relevant
form factor using lattice QCD results. In the case of B_s to D_s l nu decay we
find that effects of kinematics and chiral corrections tend to cancel for the
scalar form factor contributions. In particular the 1/m_Q suppression of chiral
corrections is compensated by the SU(3) flavor symmetry breaking corrections
which can be as large as 30%. The calculated corrections are relevant for the
precise determination of possible new physics effects in B_q to D_q l nu
decays.


title: Detection of the host galaxy of S5 0716+714

abstract:
  We have acquired a deep i-band image of the BL Lacertae object S5 0716+714
while the target was in an low optical state. Due to the faintness of the
nucleus, we were able to detect the underlying host galaxy. The host galaxy is
measured to have an I-band magnitude of 17.5 +- 0.5 and an effective radius of
(2.7 +- 0.8) arcsec. Using the host galaxy as a ``standard candle'', we derive
z = 0.31 +- 0.08 (1 sigma error) for the host galaxy of S5 0716+714. This
redshift is consistent with the redshift z = 0.26 determined by spectroscopy
for 3 galaxies close to S5 0716+714. The effective radius at z = 0.31 would be
12 +- 4 kpc, which is consistent with values obtained for BL Lac host galaxies.
An optical spectrum acquired during the same epoch shows no identifiable
spectral lines.


title:
Diversity Multiplexing Tradeoff of Asynchronous Cooperative Relay
  Networks

abstract:
  The assumption of nodes in a cooperative communication relay network
operating in synchronous fashion is often unrealistic. In the present paper, we
consider two different models of asynchronous operation in
cooperative-diversity networks experiencing slow fading and examine the
corresponding diversity-multiplexing tradeoffs (DMT). For both models, we
propose protocols and distributed space-time codes that asymptotically achieve
the transmit diversity bound for all multiplexing gains and for any number of
relays.


title:
Finite size Giant Magnons in the string dual of N=6 superconformal
  Chern-Simons theory

abstract:
  We find the exact solution for a finite size Giant Magnon in the $SU(2)\times
SU(2)$ sector of the string dual of the $\mathcal{N}=6$ superconformal
Chern-Simons theory recently constructed by Aharony, Bergman, Jafferis and
Maldacena. The finite size Giant Magnon solution consists of two magnons, one
in each $SU(2)$. In the infinite size limit this solution corresponds to the
Giant Magnon solution of arXiv:0806.4959. The magnon dispersion relation
exhibits finite-size exponential corrections with respect to the infinite size
limit solution.


title:
Reducible higher-spin multiplets in flat and AdS spaces and their
  geometric frame-like formulation

abstract:
  We consider the frame-like formulation of reducible sets of totally symmetric
bosonic and fermionic higher-spin fields in flat and AdS backgrounds of any
dimension, that correspond to so-called higher-spin triplets resulting from the
string-inspired BRST approach. The explicit relationship of the fields of
higher-spin triplets to the higher-spin vielbeins and connections is found. The
gauge invariant actions are constructed including, in particular, the reducible
(i.e. triplet) higher-spin fermion case in AdS_D space.


title: Cosmic Jerk, Snap and Beyond

abstract:
  We clarify the procedure for expressing the Friedmann equation in terms of
directly measurable cosmological scalars constructed out of higher derivatives
of the scale factor. We carry out this procedure for pure dust, Chaplygin gas
and generalised Chaplygin gas energy-momentum tensors. In each case it leads to
a constraint on the scalars thus giving rise to a test of General Relativity.
We also discuss a formulation of the Friedmann equation as unparametrised
geodesic motion and its connection with the Lagrangian treatment of perfect
fluids coupled to gravity.


title:
One-shot entanglement generation over long distances in noisy quantum
  networks

abstract:
  We consider the problem of creating a long-distance entangled state between
two stations of a network, where neighboring nodes are connected by noisy
quantum channels. We show that any two stations can share an entangled pair if
the effective probability for the quantum errors is below a certain threshold,
which is achieved by using local redundant encoding to preserve the global
phase and network-based correction for the bit-flip errors. In contrast to the
convensional quantum repeater schemes we are not limited by the memory
coherence time, because all quantum operations only use one-way classical
communication and can be done in one shot. Meanwhile, the overhead of local
resources only increases logarithmically with the size of the network, making
our proposal favorable to practical applications of long-distance quantum
communication.


title: Monte Carlo Generation of Bohmian Trajectories

abstract:
  We report on a Monte Carlo method that generates one-dimensional trajectories
for Bohm's formulation of quantum mechanics that doesn't involve
differentiation or integration of any equations of motion. At each time,
t=n\delta t (n=1,2,3,...), N particle positions are randomly sampled from the
quantum probability density. Trajectories are built from the sorted N sampled
positions at each time. These trajectories become the exact Bohm solutions in
the limits N->\infty and \delta t -> 0. Higher dimensional problems can be
solved by this method for separable wave functions. Several examples are given,
including the two-slit experiment.


title: The Rate and Spatial Distribution of Novae in M101 (NGC 5457)

abstract:
  A new multi-epoch H-alpha imaging study of M101 (NGC 5457) has been carried
out as part of a larger campaign to study the rate and stellar population of
extragalactic novae. The survey yielded a total of 13 nova detections from 10
epochs of M101 observations spanning a three year period. After correcting for
the temporal coverage and survey completeness, a global nova rate of
11.7^{+1.9}_{-1.5} per year is found. This value corresponds to a
luminosity-specific nova rate of 1.23\pm0.27 novae per year per 10^{10}
L_{\sun,K} when the K luminosity is derived from the B-K color, or 1.94\pm0.42
novae per year per 10^{10} L_{\sun,K} when the K magnitude from the Two Micron
All Sky Survey is used. These values are consistent with previous estimates by
Shafter et al. that were based on more limited data. The spatial distribution
of the combined nova sample from the present survey and from the earlier
Shafter et al. survey shows that the specific frequency of novae closely
follows the integrated background light of the galaxy.


title: The number density of a charged relic

abstract:
  We investigate scenarios in which a charged, long-lived scalar particle
decouples from the primordial plasma in the Early Universe. We compute the
number density at time of freeze-out considering both the cases of abelian and
non-abelian interactions and including the effect of Sommerfeld enhancement at
low initial velocity. We also discuss as extreme case the maximal cross section
that fulfils the unitarity bound. We then compare these number densities to the
exotic nuclei searches for stable relics and to the BBN bounds on unstable
relics and draw conclusions for the cases of a stau or stop NLSP in
supersymmetric models with a gravitino or axino LSP.


title: Entanglement and the geometry of two qubits

abstract:
  Two qubits is the simplest system where the notions of separable and
entangled states and entanglement witnesses first appear. We give a three
dimensional geometric description of these notions. This description however
carries no quantitative information on the measure of entanglement. A four
dimensional description captures also the entanglement measure. We give a neat
formula for the Bell states which leads to a slick proof of the fundamental
teleportation identity. We describe optimal distillation of two qubits
geometrically and present a simple geometric proof of the Peres-Horodecki
separability criterion.


title: First-order framework and generalized global defect solutions

abstract:
  This work deals with defect structures in models described by scalar fields.
The investigations focus on generalized models, with the kinetic term modified
to allow for a diversity of possibilities. We develop a new framework, in which
we search for first-order differential equations which solve the equations of
motion. The main issue concerns the introduction of a new function, which works
like the superpotential usually considered in the standard situation. We
investigate the problem in the general case, with an arbitrary number of
fields, and we present several explicit examples in the case of a single real
scalar field.


title:
Relativistic Closed-Form Hamiltonian for Many-Body Gravitating Systems
  in the Post-Minkowskian Approximation

abstract:
  The Hamiltonian for a system of relativistic bodies interacting by their
gravitational field is found in the post-Minkowskian approximation, including
all terms linear in the gravitational constant. It is given in a surprisingly
simple closed form as a function of canonical variables describing the bodies
only. The field is eliminated by solving inhomogeneous wave equations, applying
transverse-traceless projections, and using the Routh functional. By including
all special relativistic effects our Hamiltonian extends the results described
in classical textbooks of theoretical physics. As an application, the
scattering of relativistic objects is considered.


title:
Detection of Fluorine in the Halo Planetary Nebula BoBn 1: Evidence For
  a Binary Progenitor Star

abstract:
  We have found the fluorine lines [F IV] 3996.92A,4059.90A in the extremely
metal-poor ([Ar/H] = -2.10+/-0.21) halo planetary nebula (PN) BoBn 1 in
high-dispersion spectra from the 8.2-m VLT/UVES archive. Chemical abundance
analysis shows that the fluorine abundance is [F/H] = +1.06+/-0.08, making BoBn
1 the most fluorine-enhanced and metal-poor PN among fluorine-detected PNe and
providing new evidence that fluorine is enhanced by nucleosynthesis in low mass
metal-poor stars. A comparison with the abundances of carbon-enhanced
metal-poor (CEMP) stars suggests that BoBn 1 shares their origin and evolution
with CEMP-s stars such as HE1305+0132. BoBn 1 might have evolved from a binary
consisting of ~2 Msun primary and ~0.8 Msun secondary stars.


title: Electro-Weak Interactions in Light Nuclei

abstract:
  In this thesis, conducted in the field of few--body nuclear physics,I studied
low energy inelastic reactions of electro--weak probes on light nuclei. Such
interactions hold experimental and theoretical attention in recent years
because of the role they play in various fields of physics, stretching from
checking the standard model limits; through nuclear structure and dynamics
research; up to microscopic interaction in astrophysical phenomena, such as
supernova explosion and the nucleosynthesis of the elements. The reactions
considered in this work are: (i) Neutrino interaction with A=3 and $^4$He
nuclei, in energies typical to core-collapse supernova. For $^4$He both the
neutral and charged current reactions were calculated, whereas only neutral
current reactions are calculated for A=3 nuclei. (ii) Photoabsorption on
$^4$He. This long standing problem has been the attraction of theoretical and
experimental efforts in the last three decades. The calculations make use of
two novel methods. the Lorentz Integral Transform (LIT) method, which is used
to transform the scattering problem to a bound state like problem. The
resulting equations are solved using the Effective Interaction in the
Hyperspherical Harmonics (EIHH) method.


title: Pseudospin entanglement and Bell test in graphene

abstract:
  We propose a way of producing and detecting pseudospin entanglement between
electrons and holes in graphene. Electron-hole pairs are produced by a
fluctuating potential and their entanglement is demonstrated by a current
correlation measurement. The chirality of electrons in graphene facilitates a
well-controlled Bell test with (pseudo-)spin projection angles defined in real
space.


title: The e+A programme at a future Electron-Ion Collider facility

abstract:
  At small x, the gluon distribution dominates the nuclear wave function. The
increase needs to be tamed in avoid violating unitarity constraints. The most
efficient way to study this in colliders is through e+A collisions as the
nucleus is an efficient amplifier of the physics of high gluon densities. To
this end, there are proposals to build an e+A machine in the USA which would
operate over a large range of energies and masses. These studies would also
allow an in-depth comparison to A+A collisions where recent results have given
tantalising hints of a new state of matter produced with partonic degrees of
freedom. As gluon interactions are the dominant source of hard probes, they
themselves must be understood before the results are explained quantitatively.


title: Singular Points of Reducible Sextic Curves

abstract:
  There are 106 individual types of singular points for reducible complex
sextic curves.


title:
Production of antihydrogen at reduced magnetic field for anti-atom
  trapping

abstract:
  We have demonstrated production of antihydrogen in a 1$,$T solenoidal
magnetic field. This field strength is significantly smaller than that used in
the first generation experiments ATHENA (3$,$T) and ATRAP (5$,$T). The
motivation for using a smaller magnetic field is to facilitate trapping of
antihydrogen atoms in a neutral atom trap surrounding the production region. We
report the results of measurements with the ALPHA (Antihydrogen Laser PHysics
Apparatus) device, which can capture and cool antiprotons at 3$,$T, and then
mix the antiprotons with positrons at 1$,$T. We infer antihydrogen production
from the time structure of antiproton annihilations during mixing, using mixing
with heated positrons as the null experiment, as demonstrated in ATHENA.
Implications for antihydrogen trapping are discussed.


title:
Measurement of filling factor 5/2 quasiparticle interference:
  observation of charge e/4 and e/2 period oscillations

abstract:
  A standing problem in low dimensional electron systems is the nature of the
5/2 fractional quantum Hall state: its elementary excitations are a focus for
both elucidating the state's properties and as candidates in methods to perform
topological quantum computation. Interferometric devices may be employed to
manipulate and measure quantum Hall edge excitations. Here we use a small area
edge state interferometer designed to observe quasiparticle interference
effects. Oscillations consistent in detail with the Aharanov-Bohm effect are
observed for integer and fractional quantum Hall states (filling factors 2,
5/3, and 7/3) with periods corresponding to their respective charges and
magnetic field positions. With these as charge calibrations, at 5/2 filling
factor and at lowest temperatures periodic transmission through the device
consistent with quasiparticle charge e/4 is observed. The principal finding of
this work is that in addtion to these e/4 oscillations, periodic structures
corresponding to e/2 are also observed at 5/2 and at lowest temperatures.
Properties of the e/4 and e/2 oscillations are examined with the device
sensitivity sufficient to observe temperature evolution of the 5/2
quasiparticle interference. In the model of quasiparticle interference, this
presence of an effective e/2 period may empirically reflect an e/2
quasiparticle charge, or may reflect multiple passes of the e/4 quasiparticle
around the interferometer. These results are discussed within a picture of e/4
quasiparticle excitations potentially possessing non-Abelian statistics. These
studies demonstrate the capacity to perform interferometry on 5/2 excitations
and reveal properties important for understanding this state and its
excitations.


title: Range Medians

abstract:
  We study a generalization of the classical median finding problem to batched
query case: given an array of unsorted $n$ items and $k$ (not necessarily
disjoint) intervals in the array, the goal is to determine the median in {\em
each} of the intervals in the array. We give an algorithm that uses $O(n\log n
+ k\log k \log n)$ comparisons and show a lower bound of $\Omega(n\log k)$
comparisons for this problem. This is optimal for $k=O(n/\log n)$.


title: Tidal Disruption Flares from Recoiling Supermassive Black Holes

abstract:
  Supermassive black holes ejected from galaxy nuclei by gravitational wave
recoil will carry a retinue of bound stars, even in the absence of an accretion
disk. We discuss the observable signatures related to these stars, with an
emphasis on electromagnetic flares from stars that are tidally disrupted by the
black hole. We calculate disruption rates for the bound, and the unbound,
stars. The rates are smaller than, but comparable to, rates for non-recoiling
black holes. A key observational consequence is the existence of powerful
off-nuclear and intergalactic X-ray flares. We also discuss other observable
signatures associated with the bound stars, including episodic X-ray emission
from accretion due to stellar mass loss; intergalactic supernovae; and feedback
trails.


title: Hot-spot model for accretion disc variability as random process

abstract:
  Theory of random processes provides an attractive mathematical tool to
describe the fluctuating signal from accreting sources, such as active galactic
nuclei and Galactic black holes observed in X-rays. These objects exhibit
featureless variability on different timescales, probably originating from an
accretion disc. We study the basic features of the power spectra in terms of a
general framework, which permits semi-analytical determination of the power
spectral density (PSD) of the resulting light curve. We consider the expected
signal generated by an ensemble of spots randomly created on the accretion disc
surface. Spot generation is governed by Poisson or by Hawkes processes. We
include general relativity effects shaping the signal on its propagation to a
distant observer. We analyse the PSD of a spotted disc light curve and show the
accuracy of our semi-analytical approach by comparing the obtained PSD with the
results of Monte Carlo simulations. The asymptotic slopes of PSD are 0 at low
frequencies and they drop to -2 at high frequencies, usually with a single
frequency break. More complex two-peak solutions also occur. The amplitude of
the peaks and their frequency difference depend on the inherent timescales of
the model. At intermediate frequencies, the intrinsic PSD is influenced by the
individual light curve profile as well as by the type of the underlying
process. However, even in cases when two Lorentzians seem to dominate the PSD,
it does not necessarily imply that two single oscillation mechanisms operate
simultaneously. Instead, it may well be the manifestation of the avalanche
mechanism. The main advantage of our approach is an insight in the model
functioning and the fast evaluation of the PSD.


title: Quantum gravity as a Fermi liquid

abstract:
  We present a reformulation of loop quantum gravity with a cosmological
constant and no matter as a Fermi-liquid theory. When the topological sector is
deformed and large gauge symmetry is broken, we show that the Chern-Simons
state reduces to Jacobson's degenerate sector describing 1+1 dimensional
propagating fermions with nonlocal interactions. The Hamiltonian admits a dual
description which we realize in the simple BCS model of superconductivity. On
one hand, Cooper pairs are interpreted as wormhole correlations at the de
Sitter horizon; their number yields the de Sitter entropy. On the other hand,
BCS is mapped into a deformed conformal field theory reproducing the structure
of quantum spin networks. When area measurements are performed, Cooper-pair
insertions are activated on those edges of the spin network intersecting the
given area, thus providing a description of quantum measurements in terms of
excitations of a Fermi sea to superconducting levels. The cosmological constant
problem is naturally addressed as a nonperturbative mass-gap effect of the true
Fermi-liquid vacuum.


title: Diffusion and localization in quantum random resistor networks

abstract:
  The theoretical description of transport in a wide class of novel materials
is based upon quantum percolation and related random resistor network (RRN)
models. We examine the localization properties of electronic states of diverse
two-dimensional quantum percolation models using exact diagonalization in
combination with kernel polynomial expansion techniques. Employing the local
distribution approach we determine the arithmetically and geometrically
averaged densities of states in order to distinguish extended, current carrying
states from localized ones. To get further insight into the nature of
eigenstates of RRN models we analyze the probability distribution of the local
density of states in the whole parameter and energy range. For a recently
proposed RRN representation of graphene sheets we discuss leakage effects.


title:
The Evolution of Dusty Star Formation and Stellar Mass Assembly in
  Clusters: Results from the IRAC 3.6um, 4.5um, 5.8um and 8.0um Cluster
  Luminosity Functions

abstract:
  We present a catalogue of 99 candidate clusters and groups of galaxies in the
redshift range 0.1 < z_{phot} < 1.3 discovered in the Spitzer First Look Survey
(FLS). The clusters are selected by their R - 3.6um galaxy color-magnitude
relation using the cluster red sequence algorithm. Using this cluster sample we
compute the 3.6um, 4.5um, 5.8um, & 8.0um cluster luminosity functions (LFs).
Similar to previous studies, we find that for the bands that trace stellar mass
at these redshifts (3.6um, 4.5um) the evolution in M* is consistent with a
passively evolving population of galaxies with a high formation redshift (z_{f}
> 1.5). Using the 3.6um LF as a proxy for stellar luminosity we remove this
component from the MIR (5.8um & 8.0um) cluster LFs and measure the LF of dusty
star formation/AGN in clusters. We find that at z < 0.4 the bright end of the
cluster 8.0um LF is well-described by a composite population of quiescent
galaxies and regular star forming galaxies with a mix consistent with typical
cluster blue fractions; however, at z > 0.4, an additional population of dusty
starburst galaxies is required to properly model the 8.0um LFs. Comparison to
field studies at similar redshifts shows a strong differential evolution in the
field and cluster 8.0um LFs with redshift. At z ~ 0.65 8.0um-detected galaxies
are more abundant in clusters compared to the field, but thereafter the number
of 8.0um sources in clusters declines with decreasing redshift and by z ~ 0.15,
clusters are underdense relative to the field by a factor of ~5. The rapid
differential evolution between the cluster and field LFs is qualitatively
consistent with recent field galaxy studies that show the star formation rates
of galaxies in high density environments are larger than those in low density
environments at higher redshift.


title:
Measuring Column Densities in Quasar Outflows: VLT Observations of QSO
  2359-1241

abstract:
  We present high resolution spectroscopic VLT observations of the outflow seen
in QSO 2359-1241. These data contain absorption troughs from five resonance Fe
II lines with a resolution of ~7 km/s and signal-to-noise ratio per resolution
element of order 100. We use this unprecedented high quality data set to
investigate the physical distribution of the material in front of the source,
and by that determine the column densities of the absorbed troughs. We find
that the apparent optical depth model gives a very poor fit to the data and
greatly underestimates the column density measurements. Power-law distributions
and partial covering models give much better fits with some advantage to
power-law models, while both models yield similar column density estimates. The
better fit of the power-law model solves a long standing problem plaguing the
partial covering model when applied to large distance scale outflow: How to
obtain a velocity dependent covering factor for an outflow situated at
distances thousands of time greater than the size of the AGN emission source.
This problem does not affect power-law models. Therefore, based on the better
fit and plausibility of the physical model, we conclude that in QSO 2359-1241,
the outflow covers the full extent of the emission source but in a
non-homogeneous way.


title:
Point spread function tails and the measurements of diffuse stellar halo
  light around edge-on disc galaxies

abstract:
  Measuring the integrated stellar halo light around galaxies is very
challenging. The surface brightness of these haloes are expected to be many
magnitudes below dark sky and the central brightness of the galaxy. Here I show
that in some of the recent literature the effect of very extended Point Spread
Function (PSF) tails on the measurements of halo light has been underestimated;
especially in the case of edge-on disc galaxies. The detection of a halo along
the minor axis of an edge-on galaxy in the Hubble Ultra Deep Field can largely
be explained by scattered galaxy light. Similarly, depending on filter and the
shape one assumes for the uncertain extended PSF, 20 to 80 per cent of the halo
light found along the minor axis of scaled and stacked Sloan Digital Sky Survey
(SDSS) edge-on galaxy images can be explained by scattered galaxy light.
Scattered light also significantly contributes to the anomalous halo colours of
stacked SDSS images. The scattered light fraction decreases when looking in the
quadrants away from the minor axis. The remaining excess light is well modelled
with a Sersic profile halo with shape parameters based on star count halo
detections of nearby galaxies. Even though the contribution from PSF scattered
light does not fully remove the need for extended components around these
edge-on galaxies, it will be very challenging to make accurate halo light shape
and colour measurements from integrated light without very careful PSF
measurements and scattered light modelling.


title:
Physical Conditions in Quasar Outflows: VLT Observations of QSO
  2359-1241

abstract:
  We analyze the physical conditions of the outflow seen in QSO 2359-1241 (NVSS
J235953-124148), based on high resolution spectroscopic VLT observations. This
object was previously studied using Keck/HIRES data. The main improvement over
the HIRES results is our ability to accurately determine the number density of
the outflow. For the major absorption component, level population from five
different Fe II excited level yields n_H=10^4.4 cm^-3 with less than 20%
scatter. We find that the Fe ii absorption arises from a region with roughly
constant conditions and temperature greater than 9000 K, before the ionization
front where temperature and electron density drop. Further, we model the
observed spectra and investigate the effects of varying gas metalicities and
the spectral energy distribution of the incident ionizing radiation field. The
accurately measured column densities allow us to determine the ionization
parameter log(U) = -2.4 and total column density of the outflow (log(N_H) =
20.6 cm^-2). Combined with the number density finding, these are stepping
stones towards determining the mass flux and kinetic luminosity of the outflow,
and therefore its importance to AGN feedback processes.


title: WMAP 5-year constraints on fnl with wavelets

abstract:
  We present a Gaussianity analysis of the WMAP 5-year Cosmic Microwave
Background (CMB) temperature anisotropy data maps. We use several third order
estimators based on the spherical Mexican hat wavelet. We impose constraints on
the local non-linear coupling parameter fnl using well motivated non-Gaussian
simulations. We analyse the WMAP maps at resolution of 6.9 arcmin for the Q, V,
and W frequency bands. We use the KQ75 mask recommended by the WMAP team which
masks out 28% of the sky. The wavelet coefficients are evaluated at 10
different scales from 6.9 to 150 arcmin. With these coefficients we compute the
third order estimators which are used to perform a chi-squared analysis. The
chi-squared statistic is used to test the Gaussianity of the WMAP data as well
as to constrain the fnl parameter. Our results indicate that the WMAP data are
compatible with the Gaussian simulations, and the fnl parameter is constrained
to -8 < fnl < +111 at 95% CL for the combined V+W map. This value has been
corrected for the presence of undetected point sources, which add a positive
contribution of Delta_fnl = 3+-5 in the V+W map. Our results are very similar
to those obtained by Komatsu et al (2008) using the bispectrum.


title:
A Mathematical Theory of Stochastic Microlensing I. Random Time-Delay
  Functions and Lensing Maps

abstract:
  Stochastic microlensing is a central tool in probing dark matter on galactic
scales. From first principles, we initiate the development of a mathematical
theory of stochastic microlensing. Beginning with the random time delay
function and associated lensing map, we determine exact expressions for the
mean and variance of these transformations. We characterize the exact p.d.f. of
a normalized random time delay function at the origin, showing that it is a
shifted gamma distribution, which also holds at leading order in the limit of a
large number of point masses at a general point of the lens plane. For the
large number of point masses limit, we also prove that the asymptotic p.d.f. of
the random lensing map under a specified scaling converges to a bivariate
normal distribution. We show analytically that the p.d.f. of the random scaled
lensing map at leading order depends on the magnitude of the scaled bending
angle due purely to point masses as well as demonstrate explicitly how this
radial symmetry is broken at the next order. Interestingly, we found at leading
order a formula linking the expectation and variance of the normalized random
time delay function to the first Betti number of its domain. We also determine
an asymptotic p.d.f. for the random bending angle vector and find an integral
expression for the probability of a lens plane point being near a fixed point.
Lastly, we show explicitly how the results are affected by location in the lens
plane. The results of this paper are relevant to the theory of random fields
and provide a platform for further generalizations as well as analytical limits
for checking astrophysical studies of stochastic microlensing.


title: Hidden vortex lattices in a thermally paired superfluid

abstract:
  We study the evolution of rotational response of a hydrodynamic model of a
two-component superfluid with a non-dissipative drag interaction, as the system
undergoes a transition into a paired phase at finite temperature. The
transition manifests itself in a change of (i) vortex lattice symmetry, and
(ii) nature of vortex state. Instead of a vortex lattice, the system forms a
highly disordered tangle which constantly undergoes merger and reconnecting
processes involving different types of vortices, with a "hidden" breakdown of
translational symmetry.


title: Substructure of high-p_T Jets at the LHC

abstract:
  We study high-pt jets from QCD and from highly-boosted massive particles such
as tops, W, Z and Higgs, and argue that infrared-safe observables can help
reduce QCD backgrounds. Jets from QCD are characterized by different patterns
of energy flow compared to the products of highly-boosted heavy particle
decays, and we employ a variety of jet shapes, observables restricted to energy
flow within a jet, to explore this difference. Results from Monte Carlo
generators and arguments based on perturbation theory support the
discriminating power of the shapes we refer to as planar flow and angularities.
We emphasize that for massive jets, these and other observables can be analyzed
perturbatively.