title:
Tidal and rotational effects in the perturbations of hierarchical triple
  stellar systems. II. Eccentric systems - the case of AS Camelopardalis

abstract:
  We study the perturbations of a relatively close third star on a tidally
distorted eccentric eclipsing binary. We consider both the observational
consequences of the variations of the orbital elements and the interactions of
the stellar rotation with the orbital revolution in the presence of
dissipation. We concentrate mainly on the effect of a hypothetical third
companion on both the real, and the observed apsidal motion period. We
investigate how the observed period derived mainly from some variants of the
O-C relates to the real apsidal motion period. We carried out both analytical
and numerical investigations and give the time variations of the orbital
elements of the binary both in the dynamical and the observational reference
frames. We give the direct analytical form of an eclipsing O-C affected
simultaneously by the mutual tidal forces and the gravitational interactions
with a tertiary. We also integrated numerically simultaneously the orbital and
rotational equations for the possible hierarchical triple stellar system AS
Camelopardalis. We find that there is a significant domain of the possible
hierarchical triple system configurations, where both the dynamical and the
observational effects tend to measure longer apsidal advance rate than is
expected theoretically. This happens when the mutual inclination of the close
and the wide orbits is large, and the orbital plane of the tertiary almost
coincides with the plane of the sky. We also obtain new numerical results on
the interaction of the orbital evolution and stellar rotation in such triplets.
The most important fact is that resonances might occur as the stellar
rotational rate varies during the dissipation-driven synchronization process...


title: Invisibly decaying Higgs boson in the Littlest Higgs model with T-parity

abstract:
  We show that there are regions in the parameter space of the Littlest Higgs
model with T-parity, allowed by electroweak precision data, where the Higgs
boson can decay invisibly into a pair of heavy photons A_H with a substantial
branching ratio. For a symmetry breaking scale f in the range 450-600 GeV, the
BR(H -> A_H A_H) can be up to 95% for an intermediate mass Higgs, and from 20%
down to a few percents for a Higgs boson of mass 200 GeV or above. The total
decay width of the Higgs boson can thereby be enhanced by an order of magnitude
compared to the Standard Model for Higgs masses around 130 GeV.


title:
Light Cone QCD Sum Rules Analysis of the Axial N -> Delta Transition
  Form Factors

abstract:
  The axial N-> Delta(1232) transition form factors are calculated within the
light cone QCD sum rules method. A comparison of our results with predictions
of lattice theory and quark model calculations is pre- sented.


title: Impact of and constraints on PDFs at LHC

abstract:
  Uncertainties on parton distribution functions (PDFs) compromise discovery at
the LHC for any new physics which can be described as a contact-interaction.
PDF uncertainties also limit our ability to use W and Z cross-sections as an
accurate luminosity monitor. The impact of the current level of PDF uncertainty
on LHC physics is reviewed and the possibility of reducing this uncertainty
using LHC data is investigated.


title:
Scale Transformations, Tree-level Perturbation Theory, and the
  Cosmological Matter Bispectrum

abstract:
  Scale transformations have played an extremely successful role in studies of
cosmological large-scale structure by relating the non-linear spectrum of
cosmological density fluctuations to the linear primordial power at longer
wavelengths. Here we generalize this approach to investigate the usefulness of
scale transformations for nonlinear higher-order statistics, specifically the
bispectrum. We find that the bispectrum predicted by perturbation theory at
tree-level can be rescaled to match the results of full numerical simulations
in the weakly and intermediately nonlinear regimes, especially at high
redshifts, with an accuracy that is surprising given the simplicity of the
procedure used. This discovery not only offers a simple practical way of
calculating the matter bispectrum, but also suggests that scale transformations
may yet yield even deeper insights into the physics of hierarchical clustering.


title: Low Energy Supersymmetry from Non-Geometry

abstract:
  We study a class of flux compactifications that have all the moduli
stabilised, a high (GUT) string scale and a low (TeV) gravitino mass that is
generated dynamically. These non-geometric compactifications correspond to type
II string theories on SU(3)xSU(3) structure orientifolds. The resulting
superpotentials admit, excluding non-perturbative effects, supersymmetric
Minkowski vacua with any number of moduli stabilised. We argue that
non-perturbative effects are present and introduce terms in the superpotential
that are exponentially suppressed by the same moduli that appear
perturbatively. These deform the supersymmetric Minkowski vacua to
supersymmetric AdS vacua with an exponentially small gravitino mass. The
resulting vacua allow for low scale supersymmetry breaking which can be
realised by a number of mechanisms.


title:
From Useful Algorithms for Slowly Convergent Series to Physical
  Predictions Based on Divergent Perturbative Expansions

abstract:
  This review is focused on the borderline region of theoretical physics and
mathematics. First, we describe numerical methods for the acceleration of the
convergence of series. These provide a useful toolbox for theoretical physics
which has hitherto not received the attention it actually deserves. The
unifying concept for convergence acceleration methods is that in many cases,
one can reach much faster convergence than by adding a particular series term
by term. In some cases, it is even possible to use a divergent input series,
together with a suitable sequence transformation, for the construction of
numerical methods that can be applied to the calculation of special functions.
This review both aims to provide some practical guidance as well as a
groundwork for the study of specialized literature. As a second topic, we
review some recent developments in the field of Borel resummation, which is
generally recognized as one of the most versatile methods for the summation of
factorially divergent (perturbation) series. Here, the focus is on algorithms
which make optimal use of all information contained in a finite set of
perturbative coefficients. The unifying concept for the various aspects of the
Borel method investigated here is given by the singularities of the Borel
transform, which introduce ambiguities from a mathematical point of view and
lead to different possible physical interpretations. The two most important
cases are: (i) the residues at the singularities correspond to the decay width
of a resonance, and (ii) the presence of the singularities indicates the
existence of nonperturbative contributions which cannot be accounted for on the
basis of a Borel resummation and require generalizations toward resurgent
expansions. Both of these cases are illustrated by examples.


title: Toric Resolutions of Heterotic Orbifolds

abstract:
  We investigate resolutions of heterotic orbifolds using toric geometry. Our
starting point is provided by the recently constructed heterotic models on
explicit blowup of C^n/Z_n singularities. We show that the values of the
relevant integrals, computed there, can be obtained as integrals of divisors
(complex codimension one hypersurfaces) interpreted as (1,1)-forms in toric
geometry. Motivated by this we give a self contained introduction to toric
geometry for non-experts, focusing on those issues relevant for the
construction of heterotic models on toric orbifold resolutions. We illustrate
the methods by building heterotic models on the resolutions of C^2/Z_3, C^3/Z_4
and C^3/Z_2xZ_2'. We are able to obtain a direct identification between them
and the known orbifold models. In the C^3/Z_2xZ_2' case we observe that, in
spite of the existence of two inequivalent resolutions, fully consistent blowup
models of heterotic orbifolds can only be constructed on one of them.


title:
Theory of radiation trapping by the accelerating solitons in optical
  fibers

abstract:
  We present a theory describing trapping of the normally dispersive radiation
by the Raman solitons in optical fibers. Frequency of the radiation component
is continuously blue shifting, while the soliton is red shifting. Underlying
physics of the trapping effect is in the existence of the inertial gravity-like
force acting on light in the accelerating frame of reference. We present
analytical calculations of the rate of the opposing frequency shifts of the
soliton and trapped radiation and find it to be greater than the rate of the
red shift of the bare Raman soliton. Our findings are essential for
understanding of the continuous shift of the high frequency edge of the
supercontinuum spectra generated in photonic crystal fibers towards higher
frequencies.


title: Involutions on 3-Manifolds and Self-dual, Binary Codes

abstract:
  We study a correspondence between orientation reversing involutions on
compact 3-manifolds with only isolated fixed points and binary, self-dual
codes. We show in particular that every such code can be obtained from such an
involution. We further relate doubly even codes to Pin^- -structures and
Spin-manifolds.


title: Parameter Estimation in Manneville-Pomeau Processes

abstract:
  In this work we study a class of stochastic processes $\{X_t\}_{t\in\N}$,
where $X_t = (\phi \circ T_s^t)(X_0)$ is obtained from the iterations of the
transformation T_s, invariant for an ergodic probability \mu_s on [0,1] and a
continuous by part function $\phi:[0,1] \to \R$. We consider here $T_s:[0,1]\to
[0,1]$ the Manneville-Pomeau transformation. The autocorrelation function of
the resulting process decays hyperbolically (or polynomially) and we obtain
efficient methods to estimate the parameter s from a finite time series. As a
consequence we also estimate the rate of convergence of the autocorrelation
decay of these processes. We compare different estimation methods based on the
periodogram function, on the smoothed periodogram function, on the variance of
the partial sum and on the wavelet theory.


title: Measurement of Prominent eta Decay Branching Fractions

abstract:
  The decay psi(2S) --> eta J/psi is used to measure, for the first time, all
prominent eta-meson branching fractions with the same experiment in the same
dataset, thereby providing a consistent treatment of systematics across
branching fractions. We present results for eta decays to gamma gamma,
pi+pi-pi0, 3 pi0, pi+ pi- gamma, and e+ e- gamma, accounting for 99.9% of all
eta decays. The precisions for several of the branching fractions and their
ratios are improved. Two channels, pi+ pi- gamma and e+ e- gamma, show results
that differ at the level of three standard deviations from those previously
determined.


title: A 1.4-GHz Arecibo Survey for Pulsars in Globular Clusters

abstract:
  We have surveyed all 22 known Galactic globular clusters observable with the
Arecibo radio telescope and within 70kpc of the Sun for radio pulsations at
~1.4GHz. Data were taken with the Wideband Arecibo Pulsar Processor, which
provided the large bandwidth and high time and frequency resolution needed to
detect fast-spinning, faint pulsars. We have also employed advanced search
techniques to maintain sensitivity to short orbital period binaries. These
searches have discovered 11 new millisecond pulsars and 2 promising candidates
in 5 clusters, almost doubling the population of pulsars in the Arecibo-visible
globular clusters. Ten of these new pulsars are in binary systems, and 3 are
eclipsing. This survey has discovered significantly more very fast-spinning
pulsars (P_spin <~ 4ms) and short orbital period systems (P_orb <~ 6hr) than
previous surveys of the same clusters. We discuss some properties of these
systems, as well as some characteristics of the globular cluster pulsar
population in general, particularly its luminosity distribution.


title: A simple formula for the conserved charges of soliton theories

abstract:
  We present a simple formula for all the conserved charges of soliton
theories, evaluated on the solutions belonging to the orbit of the vacuum under
the group of dressing transformations. For pedagogical reasons we perform the
explicit calculations for the case of the sine-Gordon model, taken as a
prototype of soliton theories. We show that the energy and momentum are
boundary terms for all the solutions on the orbit of the vacuum. That orbit
includes practically all the solutions of physical interest, namely solitons,
multi-solitons, breathers, and combinations of solitons and breathers. The
example of the mKdV equation is also given explicitly.


title:
Light Quasiparticles Dominate Electronic Transport in Molecular Crystal
  Field-Effect Transistors

abstract:
  We report on an infrared spectroscopy study of mobile holes in the
accumulation layer of organic field-effect transistors based on rubrene single
crystals. Our data indicate that both transport and infrared properties of
these transistors at room temperature are governed by light quasiparticles in
molecular orbital bands with the effective masses m* comparable to free
electron mass. Furthermore, the m* values inferred from our experiments are in
agreement with those determined from band structure calculations. These
findings reveal no evidence for prominent polaronic effects, which is at
variance with the common beliefs of polaron formation in molecular solids.


title: Secant dimensions of low-dimensional homogeneous varieties

abstract:
  We completely describe the higher secant dimensions of all connected
homogeneous projective varieties of dimension at most 3, in all possible
equivariant embeddings. In particular, we calculate these dimensions for all
Segre-Veronese embeddings of P^1 * P^1, P^1 * P^1 * P^1, and P^2 * P^1, as well
as for the variety F of incident point-line pairs in P^2. For P^2 * P^1 and F
the results are new, while the proofs for the other two varieties are more
compact than existing proofs. Our main tool is the second author's tropical
approach to secant dimensions.


title:
Exchangeable partitions derived from Markovian coalescents with
  simultaneous multiple collisions

abstract:
  Kingman derived the Ewens sampling formula for random partitions from the
genealogy model defined by a Poisson process of mutations along lines of
descent governed by a simple coalescent process. M\"ohle described the
recursion which determines the generalization of the Ewens sampling formula
when the lines of descent are governed by a coalescent with multiple
collisions. In a recent work by Dong, Gnedin and Pitman, authors exploit an
analogy with the theory of regenerative composition and partition structures,
and provide various characterizations of the associated exchangeable random
partitions. This paper gives parallel results for the further generalized model
with lines of descent following a coalescent with simultaneous multiple
collisions.


title: Cactus Framework: Black Holes to Gamma Ray Bursts

abstract:
  Gamma Ray Bursts (GRBs) are intense narrowly-beamed flashes of gamma-rays of
cosmological origin. They are among the most scientifically interesting
astrophysical systems, and the riddle concerning their central engines and
emission mechanisms is one of the most complex and challenging problems of
astrophysics today. In this article we outline our petascale approach to the
GRB problem and discuss the computational toolkits and numerical codes that are
currently in use and that will be scaled up to run on emerging petaflop scale
computing platforms in the near future.
  Petascale computing will require additional ingredients over conventional
parallelism. We consider some of the challenges which will be caused by future
petascale architectures, and discuss our plans for the future development of
the Cactus framework and its applications to meet these challenges in order to
profit from these new architectures.


title:
Dimensional dependence of naked singularity formation in spherical
  gravitational collapse

abstract:
  The complete spectrum of the endstates - naked singularities, or blackholes -
of gravitational collapse is analyzed for a wide class of $N$-dimensional
spacetimes in spherical symmetry, which includes and generalizes the dust
solutions and the case of vanishing radial stresses. The final fate of the
collapse is shown to be fully determined by the local behavior of a single
scalar function and by the dimension $N$ of the spacetime. In particular, the
``critical'' behavior of the N=4 spacetimes, where a sort of phase transition
from black hole to naked singularity can occur, is still present if N=5 but
does not occur if $N > 5$, independently from the initial data of the collapse.
Physically, the results turn out to be related to the kinematical properties of
the considered solutions.


title:
Equivariant monads and equivariant lifts versus a 2-category of
  distributive laws

abstract:
  Fix a monoidal category C. The 2-category of monads in the 2-category of
C-actegories, colax C-equivarant functors, and C-equivariant natural
transformations of colax functors, may be recast in terms of pairs consisting
of a usual monad and a distributive law between the monad and the action of C,
morphisms of monads respecting the distributive law, and transformations of
monads satisfying some compatibility with the actions and distributive laws
involved. The monads in this picture may be generalized to actions of monoidal
categories, and actions of PRO-s in particular. If C is a PRO as well, then in
special cases one gets various distributive laws of a given classical type, for
example between a comonad and an endofunctor or between a monad and a comonad.
The usual pentagons are in general replaced by multigons, and there are also
``mixed'' multigons involving two distinct distributive laws. Beck's bijection
between the distributive laws and lifts of one monad to the Eilenberg-Moore
category of another monad is here extended to an isomorphism of 2-categories.
The lifts of maps of above mentioned pairs are colax C-equivariant. We finish
with a short treatment of relative distributive laws between two pseudoalgebra
structures which are relative with respect to the distributivity of two
pseudomonads involved, what gives a hint toward the generalizations.


title: How a Vicinal Layer of Solvent Modulates the Dynamics of Proteins

abstract:
  The dynamics of a folded protein is studied in water and glycerol at a series
of temperatures below and above their respective dynamical transition. The
system is modeled in two distinct states whereby the protein is decoupled from
the bulk solvent at low temperatures, and communicates with it through a
vicinal layer at physiological temperatures. A linear viscoelastic model
elucidates the less-than-expected increase in the relaxation times observed in
the backbone dynamics of the protein. The model further explains the increase
in the flexibility of the protein once the transition takes place and the
differences in the flexibility under the different solvent environments.
Coupling between the vicinal layer and the protein fluctuations is necessary to
interpret these observations. The vicinal layer is postulated to form once a
threshold for the volumetric fluctuations in the protein to accommodate
solvents of different sizes is reached. Compensation of entropic-energetic
contributions from the protein-coupled vicinal layer quantifies the scaling of
the dynamical transition temperatures in various solvents. The protein adapts
different conformational routes for organizing the required coupling to a
specific solvent, which is achieved by adjusting the amount of conformational
jumps in the surface-group dihedrals.


title: Probabilistic Cross-Identification of Astronomical Sources

abstract:
  We present a general probabilistic formalism for cross-identifying
astronomical point sources in multiple observations. Our Bayesian approach,
symmetric in all observations, is the foundation of a unified framework for
object matching, where not only spatial information, but physical properties,
such as colors, redshift and luminosity, can also be considered in a natural
way. We provide a practical recipe to implement an efficient recursive
algorithm to evaluate the Bayes factor over a set of catalogs with known
circular errors in positions. This new methodology is crucial for studies
leveraging the synergy of today's multi-wavelength observations and to enter
the time-domain science of the upcoming survey telescopes.


title: Accretion disc coronae in black hole binaries

abstract:
  Most of the luminosity of accreting black hole is emitted in the X-ray band.
This radiation is believed to emerge, through inverse Compton process, from a
hot (Te ~ 10^8 -10^9 K) optically thin (Thomson optical depth ~ 1) plasma
probably located in the immediate vicinity of the black hole. The mechanisms at
work in this so called Compton corona can be unveiled through hard X-ray
observations which have revealed a rich phenomenology. Depending on luminosity
different spectral states are observed suggesting that the nature and geometry
of the corona depends on mass accretion rate. In many instances the spectral
behaviour as a function of luminosity shows some degree of hysteresis. The
mechanisms triggering the transition between spectral states is very unclear
although it could be related to an evaporation/condensation equilibrium in an
accretion disc corona system. From the observation of correlation between the
X-ray and radio band, it appears that the Compton corona is intimately related
to the formation of compact jets and probably constitutes the base of the jet.


title: Morphologies of AGN host galaxies using HST/ACS in the CDFS-GOODS field

abstract:
  Using HST/ACS images in four bands F435W, F606W, F775W and F850LP, we
identify optical counterparts to the X-ray sources in the Chandra Deep Field
South in the GOODS South field. A detailed study has been made of these sources
to study their morphological types. We use methods like decomposition of galaxy
luminosity profiles, color maps and visual inspection of 192 galaxies which are
identified as possible optical counterparts of Chandra X-ray sources in the
CDFS-GOODS field. We find that most moderate luminosity AGN hosts are bulge
dominated in the redshift range (z \approx 0.4-1.3), but not
merging/interacting galaxies. This implies probable fueling of the moderate
luminosity AGN by mechanisms other than those merger driven.


title:
Analysis of the accuracy and convergence of equation-free projection to
  a slow manifold

abstract:
  In [C.W. Gear, T.J. Kaper, I.G. Kevrekidis, and A. Zagaris, Projecting to a
Slow Manifold: Singularly Perturbed Systems and Legacy Codes, SIAM J. Appl.
Dyn. Syst. 4 (2005) 711-732], we developed a class of iterative algorithms
within the context of equation-free methods to approximate low-dimensional,
attracting, slow manifolds in systems of differential equations with multiple
time scales. For user-specified values of a finite number of the observables,
the m-th member of the class of algorithms (m = 0, 1, ...) finds iteratively an
approximation of the appropriate zero of the (m+1)-st time derivative of the
remaining variables and uses this root to approximate the location of the point
on the slow manifold corresponding to these values of the observables. This
article is the first of two articles in which the accuracy and convergence of
the iterative algorithms are analyzed. Here, we work directly with explicit
fast--slow systems, in which there is an explicit small parameter, epsilon,
measuring the separation of time scales. We show that, for each m = 0, 1, ...,
the fixed point of the iterative algorithm approximates the slow manifold up to
and including terms of O(epsilon^m). Moreover, for each m, we identify
explicitly the conditions under which the m-th iterative algorithm converges to
this fixed point. Finally, we show that when the iteration is unstable (or
converges slowly) it may be stabilized (or its convergence may be accelerated)
by application of the Recursive Projection Method. Alternatively, the
Newton-Krylov Generalized Minimal Residual Method may be used. In the
subsequent article, we will consider the accuracy and convergence of the
iterative algorithms for a broader class of systems-in which there need not be
an explicit small parameter-to which the algorithms also apply.


title:
Random-phase-approximation-based correlation energy functionals:
  Benchmark results for atoms

abstract:
  The random phase approximation (RPA) for the correlation energy functional of
density functional theory has recently attracted renewed interest. Formulated
in terms of the Kohn-Sham (KS) orbitals and eigenvalues, it promises to resolve
some of the fundamental limitations of the local density and generalized
gradient approximations, as for instance their inability to account for
dispersion forces. First results for atoms, however, indicate that the RPA
overestimates correlation effects as much as the orbital-dependent functional
obtained by a second order perturbation expansion on the basis of the KS
Hamiltonian. In this contribution, three simple extensions of the RPA are
examined, (a) its augmentation by an LDA for short-range correlation, (b) its
combination with the second order exchange term, and (c) its combination with a
partial resummation of the perturbation series including the second order
exchange. It is found that the ground state and correlation energies as well as
the ionization potentials resulting from the extensions (a) and (c) for closed
sub-shell atoms are clearly superior to those obtained with the unmodified RPA.
Quite some effort is made to ensure highly converged RPA data, so that the
results may serve as benchmark data. The numerical techniques developed in this
context, in particular for the inherent frequency integration, should also be
useful for applications of RPA-type functionals to more complex systems.


title: Modularity and community detection in bipartite networks

abstract:
  The modularity of a network quantifies the extent, relative to a null model
network, to which vertices cluster into community groups. We define a null
model appropriate for bipartite networks, and use it to define a bipartite
modularity. The bipartite modularity is presented in terms of a modularity
matrix B; some key properties of the eigenspectrum of B are identified and used
to describe an algorithm for identifying modules in bipartite networks. The
algorithm is based on the idea that the modules in the two parts of the network
are dependent, with each part mutually being used to induce the vertices for
the other part into the modules. We apply the algorithm to real-world network
data, showing that the algorithm successfully identifies the modular structure
of bipartite networks.


title:
Computation of the cover of Shimura curves $X_0(2) \to X(1)$ for the
  cyclic cubic field of discriminant 13^2

abstract:
  We compute the canonical model of the cover of Shimura curves $X_0(2) \to
X(1)$ for the cubic field of discriminant 13^2 described at the end of Elkies'
paper "Shimura curves for level 3 subgroups of the (2,3,7) triangle group".
Last, we list the coordinates of some rational CM points on X(1).


title:
The Trade-offs with Space Time Cube Representation of Spatiotemporal
  Patterns

abstract:
  Space time cube representation is an information visualization technique
where spatiotemporal data points are mapped into a cube. Fast and correct
analysis of such information is important in for instance geospatial and social
visualization applications. Information visualization researchers have
previously argued that space time cube representation is beneficial in
revealing complex spatiotemporal patterns in a dataset to users. The argument
is based on the fact that both time and spatial information are displayed
simultaneously to users, an effect difficult to achieve in other
representations. However, to our knowledge the actual usefulness of space time
cube representation in conveying complex spatiotemporal patterns to users has
not been empirically validated. To fill this gap we report on a
between-subjects experiment comparing novice users error rates and response
times when answering a set of questions using either space time cube or a
baseline 2D representation. For some simple questions the error rates were
lower when using the baseline representation. For complex questions where the
participants needed an overall understanding of the spatiotemporal structure of
the dataset, the space time cube representation resulted in on average twice as
fast response times with no difference in error rates compared to the baseline.
These results provide an empirical foundation for the hypothesis that space
time cube representation benefits users when analyzing complex spatiotemporal
patterns.


title: An Extremely Bright Echo Associated With SN 2002hh

abstract:
  We present new, very late-time optical photometry and spectroscopy of the
interesting Type II-P supernova, SN 2002hh, in NGC 6946. Gemini/GMOS-N has been
used to acquire visible spectra at six epochs between 2004 August and 2006
July, following the evolution of the SN from age 661 to 1358 days. Few optical
spectra of Type II supernovae with ages greater than one year exist. In
addition, g'r'i' images were acquired at all six epochs. The spectral and
photometric evolution of SN 2002hh has been very unusual. Measures of the
brightness of this SN, both in the R and I bands as well as in the H-alpha
emission flux, show no significant fading over an interval of nearly two years.
The most straightforward explanation for this behavior is that the light being
measured comes not only from the SN itself but also from an echo off of nearby
dust. Echoes have been detected previously around several SNe but these echoes,
at their brightest, were ~8 mag below the maximum brightness of the SN. At V~21
mag, the putative echo dominates the light of SN 2002hh and is only ~4 mag
below the outburst's peak brightness. There is an estimated 6 magnitudes of
total extinction in V towards SN 2002hh. The proposed explanation of a
differential echo/SN absorption is inconsistent with the observed BVRI colors.


title:
Level Spacings in Random Matrix Theory and Coulomb Blockade Peaks in
  Quantum Dots

abstract:
  We obtain analytic formulae for the spacing between conductance peaks in the
Coulomb blockade regime, based on the universal Hamiltonian model of quantum
dots. New random matrix theory results are developed in order to treat
correlations between two and three consecutive spacings in the energy level
spectrum. These are generalizations of the Wigner surmise for the probability
distribution of single level spacing. The analytic formulae are shown to be in
good agreement with numerical evaluation.


title: Decoupling limits of N=4 super Yang-Mills on R x S^3

abstract:
  We find new decoupling limits of N=4 super Yang-Mills (SYM) on R x S^3 with
gauge group SU(N). These decoupling limits lead to decoupled theories that are
much simpler than the full N=4 SYM but still contain many of its interesting
features. The decoupling limits correspond to being in a near-critical region,
near a point with zero temperature and critical chemical potentials. The new
decoupling limits are found by generalizing the limits of hep-th/0605234 to
include not only the chemical potentials for the SU(4) R-symmetry of N=4 SYM
but also the chemical potentials corresponding to the SO(4) symmetry. In the
decoupled theories it is possible to take a strong coupling limit in a
controllable manner since the full effective Hamiltonian is known. For planar
N=4 SYM on R x S^3 all the decoupled theories correspond to fully integrable
spin chains. We study the thermodynamics of the decoupled theories and find the
Hagedorn temperature for small and large values of the effective coupling. We
find an alternative formulation of the decoupling limits in the microcanonical
ensemble. This leads to a characterization of certain regimes of weakly coupled
N=4 SYM in which there are string-like states. Finally, we find a similar
decoupling limit for pure Yang-Mills theory, which for the planar limit leads
to a fully integrable decoupled theory.


title: Dynamic Failure in Amorphous Solids via a Cavitation Instability

abstract:
  The understanding of dynamic failure in amorphous materials via the
propagation of free boundaries like cracks and voids must go beyond elasticity
theory, since plasticity intervenes in a crucial and poorly understood manner
near the moving free boundary. In this Letter we focus on failure via a
cavitation instability in a radially-symmetric stressed material, set up the
free boundary dynamics taking both elasticity and visco-plasticity into
account, using the recently proposed athermal Shear Transformation Zone theory.
We demonstrate the existence (in amorphous systems) of fast cavitation modes
accompanied by extensive plastic deformations and discuss the revealed physics.


title:
Derivation of the Quantum Probability Rule without the Frequency
  Operator

abstract:
  We present an alternative frequencists' proof of the quantum probability rule
which does not make use of the frequency operator, with expectation that this
can circumvent the recent criticism against the previous proofs which use it.
We also argue that avoiding the frequency operator is not only for technical
merits for doing so but is closely related to what quantum mechanics is all
about from the viewpoint of many-world interpretation.


title:
Sound beyond the speed of light: destructive interference, anomalous
  dispersion and nonlocality of near field

abstract:
  Experimentally fixed sound pulse beyond of light speed in the region of
anomalous dispersion [W. M. Robertson, e. a. Appl. Phys. Lett, 90, 014102
(2007)] can be explained, as well as the similar superluminal phenomena, by
"the nonlocality in the small" of near electromagnetic field at transferring of
relevanted excitations.


title: Double affine Hecke algebra in logarithmic conformal field theory

abstract:
  We construct the representation of Double Affine Hecke Algebra whose
symmetrization gives the center of the quantum group U_q(sl(2)) and by
Kazhdan--Lusztig duality the Verlinde algebra of (1,p) models of logarithmic
conformal field theory.


title:
Asymptotically nonexpansive mappings in uniformly convex hyperbolic
  spaces

abstract:
  This paper provides a fixed point theorem for asymptotically nonexpansive
mappings in uniformly convex hyperbolic spaces as well as new effective results
on the Krasnoselski-Mann iterations of such mappings. The latter were found
using methods from logic and the paper continues a case study in the general
program of extracting effective data from prima-facie ineffective proofs in the
fixed point theory of such mappings.


title:
Soft X-ray Circular Reflectivity from Ferromagnetic Transition-Metal
  Films Near the Brewster's Angle: Theoretical and Numerical X-ray Resonant
  Magnetic Scattering Study

abstract:
  We first report a novel phenomenon that manifests itself in a colossal
difference in soft x-ray reflectivity from ferromagnetic transition-metal films
between the left- and right-handed circular polarization (LCP and RCP) modes at
a resonance near normal Brewster's angle. Theoretical and numerical studies of
sft x-ray resonant magnetic scattering using the circular-polarization-mode
basis reveal that this effect arises from a totally destructive interference of
photons scattered individually from chargem orbital, and spin degrees of
freedom in magnetized thin films that selectively occurs only for one helicity
of the opposite circular modes when the required criteria are fulfilled. Across
the normal Brewster's angle. the polarization state of scattered soft x-ray is
continuously variable from the RCP to the LCP mode (or vice versa) through the
linear s polarization mode by changing the incidence angle of linear
p-polarized x rays at the resonance.


title:
On the solutions of a boundary value problem arising in free convection
  with prescribed heat flux

abstract:
  For given $a\in\R$, c<0, we are concerned with the solution $f^{}_b$ of the
differential equation
$f^{\prime\prime\prime}+ff^{\prime\prime}+\g(f^{\prime})=0$, satisfying the
initial conditions $f(0)=a$, $f'(0)=b$, $f''(0)=c< 0$, where g is some
nonnegative subquadratic locally Lipschitz function. It is proven that there
exists $b_*>0$ such that $f^{}_b$ exists on $[0,+\infty)$ and is such that
$f'_b(t)\to 0$ as $t\to+\infty$, if and only if $b\geq b_*$. This allows to
answer questions about existence, uniqueness and boundedness of solutions to a
boundary value problem arising in fluid mechanics, and especially in boundary
layer theory.


title: Storing quantum states in bosonic dissipative networks

abstract:
  Considering a network of dissipative quantum harmonic oscillators we deduce
and analyze the optimum topologies which are able to store, for the largest
period of time, a quantum superposition previously prepared in one of the
network oscillators. The storage of the superposition is made dynamically, in
that the state to be protected evolves through the network before being
retrieved back in the oscillator where it was prepared. The decoherence time
during the dynamic storage process is computed and we demonstrate that it is
proportional to the number of oscillators in the network for a particular
regime of parameters.


title:
Direct link between low temperature magnetism and high temperature
  sodium order in NaxCoO2

abstract:
  We prove the direct link between low temperature magnetism and high
temperature sodium ordering in NaxCoO2 using the example of a heretofore
unreported magnetic transition at 8 K which involves a weak ferromagnetic
moment. The 8 K feature is characterized in detail and its dependence on a
diffusive sodium rearrangement around 200 K is demonstrated. Applying muons as
local probes this process is shown to result in a reversible phase separation
into distinct magnetic phases that can be controlled by specific cooling
protocols. Thus the impact of ordered sodium Coulomb potential on the CoO2
physics is evidenced opening new ways to experimentally revisit the NaxCoO2
phase diagram.


title: Spin-Dependent Ringing and Beats in a Quantum Dot System

abstract:
  We report spin-dependent quantum coherent oscillations (ringing) and beats of
the total and spin currents flowing through a quantum dot with Zeeman split
levels. The spin dependent transport is calculated via nonequilibrium Green
function in the transient after a bias voltage is turned on at t=0. The dot is
coupled to two electrodes that can be ferromagnetic or nonmagnetic. In the
ferromagnetic case both parallel and antiparallel alignments are considered.
The coherent oscillation and beat frequencies are controlled via the Zeeman
energy E_Z. In particular, for E_Z=0 no beats are observed and the spin current
is zero for nonmagnetic leads. In the ferromagnetic case a finite spin current
is found for E_Z=0. The effects of temperature are also analyzed. We observe
that with increasing temperature the ringing response and the beats tend to
disappear. Additionally, the spin current goes to zero for nonmagnetic leads,
remaining finite in the ferromagnetic case. The tunnel magnetoresistance (TMR)
also reveals quantum coherent oscillations and beats, and it attains negative
values for small enough temperatures and short times.


title: The FMNRxPYTHIA interface for Heavy Quark production at HERA

abstract:
  A method to calculate heavy flavor visible-level cross sections at
Next-to-Leading Order (NLO) in Quantum Chromodynamics (QCD), based on an
interface of the FMNR program to PYTHIA, is described. It uses the NLO
prediction at quark level provided by FMNR, with a statistical reduction
procedure (REDSTAT) that allows a link to PYTHIA 6.2 to be made, from where the
description of the full hadron fragmentation and decay chain is obtained. The
method is applied to ep -> b bbar X -> D* mu X and mu+ mu- X final states at
HERA. Comparisons of the data and NLO cross sections at visible and b-quark
level were found to be consistent.


title:
Search for Prompt Production of $\chi_{c}$ and X(3872) in e^+e^-
  Annihilations

abstract:
  We have searched for prompt production of $\chi_{c1}$, $\chi_{c2}$ and
X(3872) in continuum e^+e^- annihilations using a 386 fb^{-1} data sample
collected around $\sqrt{s} = 10.6$ GeV with the BABAR detector using the
$\gamma J/\psi$ decay mode. After accounting for the feed-down from
$\psi(2S)\to\gamma\chi_{c1,2}$, no significant signal for prompt $\chi_{c1,2}$
production is observed. We present improved upper limits on the cross-section,
with the rest of the event consisting of more than two charged tracks, to be 77
fb for $\chi_{c1}$ and 79 fb for $\chi_{c2}$ with $e^+e^-$ center-of-mass frame
$\chi_c$ momentum greater than 2.0 GeV at 90% confidence level. These limits
are consistent with NRQCD predictions. We also set an upper limit on the prompt
production of X(3872) through the decay $X(3872)\to \gamma J/\psi$.


title: Optimal generation of entanglement under local control

abstract:
  We study the optimal generation of entanglement between two qubits subject to
local unitary control. With the only assumptions of linear control and unitary
dynamics, by means of a numerical protocol based on the variational approach
(Pontryagin's Minimum Principle), we evaluate the optimal control strategy
leading to the maximal achievable entanglement in an arbitrary interaction
time, taking into account the energy cost associated to the controls. In our
model we can arbitrarily choose the relative weight between a large
entanglement and a small energy cost.


title: Principal $\hat{sl}(3)$ subspaces and quantum Toda Hamiltonian

abstract:
  We study a class of representations of the Lie algebra of Laurent polynomials
with values in the nilpotent subalgebra of sl(3). We derive Weyl-type (bosonic)
character formulas for these representations. We establish a connection between
the bosonic formulas and the Whittaker vector in the Verma module for the
quantum group $U_v sl(3)$. We also obtain a fermionic formula for an
eigenfunction of the sl(3) quantum Toda Hamiltonian.


title: Gravastar energy conditions revisited

abstract:
  We consider the gravastar model where the vacuum phase transition between the
de Sitter interior and the Schwarzschild or Schwarzschild-de Sitter exterior
geometries takes place at a single spherical delta-shell. We derive sharp
analytic bounds on the surface compactness (2m/r) that follow from the
requirement that the dominant energy condition (DEC) holds at the shell. In the
case of Schwarzschild exterior, the highest surface compactness is achieved
with the stiff shell in the limit of vanishing (dark) energy density in the
interior. In the case of Schwarzschild-de Sitter exterior, in addition to the
gravastar configurations with the shell under surface pressure, gravastar
configurations with vanishing shell pressure (dust shells), as well as
configurations with the shell under surface tension, are allowed by the DEC.
Respective bounds on the surface compactness are derived for all cases. We also
consider the speed of sound on the shell as derived from the requirement that
the shell is stable against the radial perturbations. The causality requirement
(sound speed not exceeding that of light) further restricts the space of
allowed gravastar configurations.


title: A partial $A_\infty$-structure on the cohomology of $C_n\times C_m$

abstract:
  Suppose k is a field of characteristic 2, and $n,m\geq 4$ powers of 2. Then
the $A_\infty$-structure of the group cohomology algebras $H^*(C_n,k)$ and
$(H^*(C_m,k)$ are well known. We give results characterizing an
$A_\infty$-structure on $H^*(C_n\times C_m,k)$ including limits on
non-vanishing low-arity operations and an infinite family of non-vanishing
higher operations.


title: Quantum Limits in Nanomechanical Systems

abstract:
  In two articles, the authors claim that the Heisenberg uncertainty principle
limits the precision of simultaneous measurements of the position and velocity
of a particle and refer to experimental evidence that supports their claim.
  It is true that ever since the inception of quantum mechanics, the
uncertainty relation that corresponds to a pair of observables represented by
non-commuting operators is interpreted by many scientists and engineers,
including Heisenberg himself, as a limitation on the accuracy with which
observables can be measured. However, such a limitation cannot be deduced from
the postulates and theorems of quantum thermodynamics.


title: Interface groups and financial transfer architectures

abstract:
  Analytic execution architectures have been proposed by the same authors as a
means to conceptualize the cooperation between heterogeneous collectives of
components such as programs, threads, states and services. Interface groups
have been proposed as a means to formalize interface information concerning
analytic execution architectures. These concepts are adapted to organization
architectures with a focus on financial transfers. Interface groups (and
monoids) now provide a technique to combine interface elements into interfaces
with the flexibility to distinguish between directions of flow dependent on
entity naming.
  The main principle exploiting interface groups is that when composing a
closed system of a collection of interacting components, the sum of their
interfaces must vanish in the interface group modulo reflection. This certainly
matters for financial transfer interfaces.
  As an example of this, we specify an interface group and within it some
specific interfaces concerning the financial transfer architecture for a part
of our local academic organization.
  Financial transfer interface groups arise as a special case of more general
service architecture interfaces.


title: Asymptotic regimes for the occupancy scheme of multiplicative cascades

abstract:
  In the classical occupancy scheme, one considers a fixed discrete probability
measure ${\bf p}=(p_i: {i\in{\cal I}})$ and throws balls independently at
random in boxes labeled by ${\cal I}$, such that $p_i$ is the probability that
a given ball falls into the box $i$. In this work, we are interested in
asymptotic regimes of this scheme in the situation induced by a refining
sequence $({\bf p}(k) : k\in\N)$ of random probability measures which arise
from some multiplicative cascade. Our motivation comes from the study of the
asymptotic behavior of certain fragmentation chains


title: PPN as Explosions: Bullets vs Jets and Nebular Shaping

abstract:
  Many proto-planetary nebulae (PPN) appear as narrow collimated structures
sometimes showing multiple, roughly aligned lobes. In addition, many PPN flows
have been shown to have short acceleration times. In this paper we explore
whether jet or ``bullet'' (a massive clump) models fit the observations of
individual collimated lobes adequately by comparing simulations of both
radiatively cooled (stable) jets and bullets. We find that the clump model is
somewhat favored over jets because (1) it leads to greater collimation of
outflows (2) it accounts better and more naturally for ring-like structures
observed in the PPN CRL 618, and (3) it is more successful in reproducing the
Hubble-flow character of observed kinematics in some PPN. In addition, bullets
naturally account for observed multipolar flows, since the likely MHD launch
mechanisms required to drive outflows make multiple non-aligned jets unlikely.
Thus we argue that PPN outflows may be driven by explosive MHD launch
mechanisms such as those discussed in the context of supernovae (SNe) and
gamma-ray bursts(GRB).


title: Polarization aspects in radiative neutralino production

abstract:
  We study the impact of beam polarization on radiative neutralino production
e+e- \to \chi^0_1 \chi^0_1 photon at the International Linear Collider. We show
that longitudinal polarized beams significantly enhance the signal and
simultaneously reduce the Standard Model background from radiative neutrino
production e+e- \to \nu \bar\nu photon. We point out that the radiative
production of neutralinos could be the only accessible SUSY particles, if
neutralinos, charginos, sleptons, as well as squarks and gluinos are too heavy
to be pair-produced in the first stage of the ILC at sqrt{s} = 500 GeV.


title: Birational Calabi-Yau 3-folds and BPS state counting

abstract:
  This paper contains some applications of Bridgeland-Douglas stability
conditions on triangulated categories, and Joyce's work on counting invariants
of semistable objects, to the study of birational geometry. We introduce the
notion of motivic Gopakumar-Vafa invariants as counting invariants of
D2-branes, and show that they are invariant under birational transformations
between Calabi-Yau 3-folds. The result is similar to the fact that birational
Calabi-Yau 3-folds have the same betti numbers or Hodge numbers.


title: Fast and Simple Relational Processing of Uncertain Data

abstract:
  This paper introduces U-relations, a succinct and purely relational
representation system for uncertain databases. U-relations support
attribute-level uncertainty using vertical partitioning. If we consider
positive relational algebra extended by an operation for computing possible
answers, a query on the logical level can be translated into, and evaluated as,
a single relational algebra query on the U-relation representation. The
translation scheme essentially preserves the size of the query in terms of
number of operations and, in particular, number of joins. Standard techniques
employed in off-the-shelf relational database management systems are effective
for optimizing and processing queries on U-relations. In our experiments we
show that query evaluation on U-relations scales to large amounts of data with
high degrees of uncertainty.


title: Decoherence in a Two Slit Diffraction Experiment with Massive Particles

abstract:
  Matter-wave interferometry has been largely studied in the last few years.
Usually, the main problem in the analysis of the diffraction experiments is to
establish the causes for the loss of coherence observed in the interference
pattern. In this work, we use different type of environmental couplings to
model a two slit diffraction experiment with massive particles. For each model,
we study the effects of decoherence on the interference pattern and define a
visibility function that measures the loss of contrast of the interference
fringes on a distant screen. Finally, we apply our results to the experimental
reported data on massive particles $C_{70}$.


title: Fuzzy communities and the concept of bridgeness in complex networks

abstract:
  We consider the problem of fuzzy community detection in networks, which
complements and expands the concept of overlapping community structure. Our
approach allows each vertex of the graph to belong to multiple communities at
the same time, determined by exact numerical membership degrees, even in the
presence of uncertainty in the data being analyzed. We created an algorithm for
determining the optimal membership degrees with respect to a given goal
function. Based on the membership degrees, we introduce a new measure that is
able to identify outlier vertices that do not belong to any of the communities,
bridge vertices that belong significantly to more than one single community,
and regular vertices that fundamentally restrict their interactions within
their own community, while also being able to quantify the centrality of a
vertex with respect to its dominant community. The method can also be used for
prediction in case of uncertainty in the dataset analyzed. The number of
communities can be given in advance, or determined by the algorithm itself
using a fuzzified variant of the modularity function. The technique is able to
discover the fuzzy community structure of different real world networks
including, but not limited to social networks, scientific collaboration
networks and cortical networks with high confidence.


title: Testing models of inflation with CMB non-gaussianity

abstract:
  Two different predictions for the primordial curvature fluctuation bispectrum
are compared through their effects on the Cosmic Microwave Background
temperature fluctuations. The first has a local form described by a single
parameter f_{NL}. The second is based on a prediction from the warm
inflationary scenario, with a different dependence on wavenumber and a
parameter f_{WI}. New expressions are obtained for the angular bispectra of the
temperature fluctuations and for the estimators used to determine $f_{NL}$ and
f_{WI}. The standard deviation of the estimators in an ideal experiment is
roughly 5 times larger for f_{WI} than for f_{NL}. Using 3 year WMAP data gives
limits -375<f_{WI}<36.8, but there is a possibility of detecting a signal for
f_{WI} from the Planck satellite.


title:
Evidence for the B0->ppbarK*0 and B+->eta_cK*+ decays and Study of the
  Decay Dynamics of B Meson Decays into ppbarh Final States

abstract:
  With a sample of 232x10^6 Upsilon(4S)->BBbar events collected with the BaBar
detector, we study the decays of B mesons to ppbarh final states, where
h=pi+,Ks,K*0 or K*+. We report evidence for the B->ppbarK*0 decay, with a
branching fraction (1.5+/-0.5(stat)+/-0.4(syst))x10^-6, and for the
B+->eta_cK*+ decay, with the branching fraction of
Br(B+->eta_cK*+)xBr(eta_c->ppbar)=(1.57^{+0.56}_{-0.45}(stat)^{+0.46}_{-0.36}(syst))x10^-6,
and provide improved measurements of the branching fractions of the other modes
of this type. We also report the measurements of the charge asymmetry
consistent with zero in the B+->ppbarpi+, B0->ppbarK*0 and B+->ppbarK*+ modes.
No evidence is found for the pentaquark candidate Theta+ in the mass range 1.52
to 1.55 GeV/c^2, decaying into pKs, or the glueball candidate fJ(2220) in the
mass range 2.2<mppbar<2.4GeV/c^2, and branching fraction limits are established
for both at the 10^-7 level.


title:
One-dimensional superfluid Bose-Fermi mixture: mixing, demixing and
  bright solitons

abstract:
  We study a ultra-cold and dilute superfluid Bose-Fermi mixture confined in a
strictly one-dimensional atomic waveguide by using a set of coupled nonlinear
mean-field equations obtained from the Lieb-Liniger energy density for bosons
and the Gaudin-Yang energy density for fermions. We consider a finite
Bose-Fermi inter-atomic strength g_{bf} and both periodic and open boundary
conditions. We find that with periodic boundary conditions, i.e. in a quasi-1D
ring, a uniform Bose-Fermi mixture is stable only with a large fermionic
density. We predict that at small fermionic densities the ground state of the
system displays demixing if g_{bf}>0 and may become a localized Bose-Fermi
bright soliton for g_{bf}<0. Finally, we show, using variational and numerical
solution of the mean-field equations, that with open boundary conditions, i.e.
in a quasi-1D cylinder, the Bose-Fermi bright soliton is the unique ground
state of the system with a finite number of particles, which could exhibit a
partial mixing-demixing transition. In this case the bright solitons are
demonstrated to be dynamically stable. The experimental realization of these
Bose-Fermi bright solitons seems possible with present setups.


title:
Short-time dynamics in presence of wave-particles interactions: a
  perturbative approach

abstract:
  The self-consistent interaction between a beam of charged particles and a
wave is considered, within a Vlasov picture. The model is discussed with
reference to the case of a Free Electron Laser. Starting with a spatially
bunched waterbag distribution, we derive, via perturbative methods, closed
analytical expressions for the time evolution of the main macroscopic
observables. Predictions of the theory are shown to agree with direct numerical
simulations.


title: Local SU(5) Unification from the Heterotic String

abstract:
  We construct a 6D supergravity theory which emerges as intermediate step in
the compactification of the heterotic string to the supersymmetric standard
model in four dimensions. The theory has N=2 supersymmetry and a gravitational
sector with one tensor and two hypermultiplets in addition to the supergravity
multiplet. Compactification to four dimensions occurs on a T^2/Z_2 orbifold
which has two inequivalent pairs of fixed points with unbroken SU(5) and
SU(2)xSU(4) symmetry, respectively. All gauge, gravitational and mixed
anomalies are cancelled by the Green-Schwarz mechanism. The model has partial
6D gauge-Higgs unification. Two quark-lepton generations are localized at the
SU(5) branes, the third family is composed of split bulk hypermultiplets. The
top Yukawa coupling is given by the 6D gauge coupling, all other Yukawa
couplings are generated by higher-dimensional operators at the SU(5) branes.
The presence of the SU(2)xSU(4) brane breaks SU(5) and generates split gauge
and Higgs multiplets with N=1 supersymmetry in four dimensions. The third
generation is obtained from two split \bar{5}-plets and two split 10-plets,
which together have the quantum numbers of one \bar{5}-plet and one 10-plet.
This avoids unsuccessful SU(5) predictions for Yukawa couplings of ordinary 4D
SU(5) grand unified theories.


title: The Offline Software Framework of the Pierre Auger Observatory

abstract:
  The Pierre Auger Observatory is designed to unveil the nature and the origins
of the highest energy cosmic rays. The large and geographically dispersed
collaboration of physicists and the wide-ranging collection of simulation and
reconstruction tasks pose some special challenges for the offline analysis
software. We have designed and implemented a general purpose framework which
allows collaborators to contribute algorithms and sequencing instructions to
build up the variety of applications they require. The framework includes
machinery to manage these user codes, to organize the abundance of
user-contributed configuration files, to facilitate multi-format file handling,
and to provide access to event and time-dependent detector information which
can reside in various data sources. A number of utilities are also provided,
including a novel geometry package which allows manipulation of abstract
geometrical objects independent of coordinate system choice. The framework is
implemented in C++, and takes advantage of object oriented design and common
open source tools, while keeping the user side simple enough for C++ novices to
learn in a reasonable time. The distribution system incorporates unit and
acceptance testing in order to support rapid development of both the core
framework and contributed user code.


title:
Dynamical instability in kicked Bose-Einstein condensates: Bogoliubov
  resonances

abstract:
  Bose-Einstein condensates subject to short pulses (`kicks') from standing
waves of light represent a nonlinear analogue of the well-known chaos paradigm,
the quantum kicked rotor. Previous studies of the onset of dynamical
instability (ie exponential proliferation of non-condensate particles)
suggested that the transition to instability might be associated with a
transition to chaos. Here we conclude instead that instability is due to
resonant driving of Bogoliubov modes. We investigate the excitation of
Bogoliubov modes for both the quantum kicked rotor (QKR) and a variant, the
double kicked rotor (QKR-2). We present an analytical model, valid in the limit
of weak impulses which correctly gives the scaling properties of the resonances
and yields good agreement with mean-field numerics.


title:
Strong pickup-channel coupling effects in proton scattering: the case of
  p + Be-10

abstract:
  The dynamic polarization potential (DPP) contribution to the effective
proton-nucleus interaction, that is due to the coupling of deuteron channels,
is evaluated by applying $S_{lj} \to V(r)$ inversion to the elastic channel
$S$-matrix from coupled reaction channel calculations of proton elastic
scattering. This was done for protons scattering from $^{10}$Be at 12, 13, 14,
15, and 16 MeV; non-orthogonality corrections were included. We find a
consistent pattern of a repulsive real and an absorptive imaginary DPP, with
the absorption shifted to a larger radius. This is consistent with what has
been found for proton scattering from the neutron skin nucleus $^8$He. The DPP
is not of a form that can be represented by a renormalization of the bare
potential, and has properties suggesting an underlying non-local process. We
conclude that deuteron channels cannot be omitted from a full theoretical
description of the proton-nucleus interaction (optical potential).


title: PT-symmetric Models with O(N) Symmetry

abstract:
  We construct PT-symmetric quantum mechanical models with an O(N)-symmetric
interaction term of the form $-g(\vec{x}^{2})^{2}/N$. Using functional integral
methods, we find the equivalent Hermitian model, which has several unusual
features. The effective potential obtained in the large-N limit of the
Hermitian form is shown to be identical to the form obtained from the original
PT-symmetric model using familiar constraint field methods. The analogous
constraint field prescription in four dimensions suggests that
$-g(\vec{\phi}^{2})^{2}/N$ PT-symmetric scalar field theories are
asymptotically free.


title: Electrical control of spin relaxation in a quantum dot

abstract:
  We demonstrate electrical control of the spin relaxation time T_1 between
Zeeman split spin states of a single electron in a lateral quantum dot. We find
that relaxation is mediated by the spin-orbit interaction, and by manipulating
the orbital states of the dot using gate voltages we vary the relaxation rate
W= (T_1)^-1 by over an order of magnitude. The dependence of W on orbital
confinement agrees with theoretical predictions and from these data we extract
the spin-orbit length. We also measure the dependence of W on magnetic field
and demonstrate that spin-orbit mediated coupling to phonons is the dominant
relaxation mechanism down to 1T, where T_1 exceeds 1s.


title: Observation of Spin-glass-like Behavior in SrRuO3 Epitaxial Thin Films

abstract:
  We report the observation of spin-glass-like behavior and strong magnetic
anisotropy in extremely smooth (~1-3 \AA) roughness) epitaxial (110) and (010)
SrRuO3 thin films. The easy axis of magnetization is always perpendicular to
the plane of the film (unidirectional) irrespective of crystallographic
orientation. An attempt has been made to understand the nature and origin of
spin-glass behavior, which fits well with Heisenberg model.


title: $\tau$ electric dipole moment with polarized beams

abstract:
  High luminosity Super B/Flavor factories, near and on top of the $\Upsilon$
resonances, allow for a detailed investigation of CP-violation in $\tau$
physics. In particular, bounds on the $\tau$ electric dipole moment can be
obtained from CP-odd observables. We perform an independent analysis from other
low and high energy data. For polarized electron beam a CP-odd asymmetry,
associated to the normal polarization term, can be used to set stringent bounds
on the $\tau$ electric dipole moment.


title: Shock probes in a one-dimensional Katz-Lebowitz-Spohn model

abstract:
  We consider shock probes in a one-dimensional driven diffusive medium with
nearest neighbor Ising interaction (KLS model). Earlier studies based on an
approximate mapping of the present system to an effective zero-range process
concluded that the exponents characterising the decays of several static and
dynamical correlation functions of the probes depend continuously on the
strength of the Ising interaction. On the contrary, our numerical simulations
indicate that over a substantial range of the interaction strength, these
exponents remain constant and their values are the same as in the case of no
interaction (when the medium executes an ASEP). We demonstrate this by
numerical studies of several dynamical correlation functions for two probes and
also for a macroscopic number of probes. Our results are consistent with the
expectation that the short-ranged correlations induced by the Ising interaction
should not affect the large time and large distance properties of the system,
implying that scaling forms remain the same as in the medium with no
interactions present.


title: Accardi complementarity for -1/2 < mu < 0 and related results

abstract:
  We show (an earlier conjecture of the last two authors) that the momentum and
position operators of mu-deformed quantum mechanics for -1/2 < mu < 0 are not
Accardi complementary. We also prove some related formulas that were
conjectured by the same authors.


title:
Vanishing of the upper critical field in Bi_2Sr_2CaCu_2O_{8+\delta} from
  Landau-Ott scaling

abstract:
  We apply Landau-Ott scaling to the reversible magnetization data of
Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ published by Y. Wang et al. [\emph{Phys.
Rev. Lett. \textbf{95} 247002 (2005)}] and find that the extrapolation of the
Landau-Ott upper critical field line vanishes at a critical temperature
parameter, T^*_c, a few degrees above the zero resistivity critical
temperature, T_c. Only isothermal curves below and near to T_c were used to
determine this transition temperature. This temperature is associated to the
disappearance of the mixed state instead of a complete suppression of
superconductivity in the sample.


title: Black hole masses and enrichment of z ~ 6 SDSS quasars

abstract:
  We present sensitive near-infrared spectroscopic observations for a sample of
five z ~ 6 quasars. These are amongst the most distant, currently known quasars
in the universe. The spectra have been obtained using ISAAC at the VLT and
include the CIV, MgII and FeII lines. We measure the FeII/MgII line ratio, as
an observational proxy for the Fe/alpha element ratio. We derive a ratio of
2.7+/-0.8 for our sample, which is similar to that found for lower redshift
quasars, i.e., we provide additional evidence for the lack of evolution in the
FeII/MgII line ratio of quasars up to the highest redshifts. This result
demonstrates that the sample quasars must have undergone a major episode of
iron enrichment in less than one Gyr and star formation must have commenced at
z > 8. The linewidths of the MgII and CIV lines give two estimates for the
black hole masses. A third estimate is given by assuming that the quasars emit
at their Eddington luminosity. The derived masses using these three methods
agree well, implying that the quasars are not likely to be strongly lensed. We
derive central black hole masses of 0.3-5.2 10^9 solar masses. We use the
difference between the redshift of MgII (a proxy for the systemic redshift of
the quasar) and the onset of the Gunn Peterson trough to derive the extent of
the ionized Stromgren spheres around our target quasars. The derived physical
radii are about five Mpc. Using a simple ionization model, the emission of the
central quasars would need of order 10^6-10^8 year to create these cavities in
a surrounding intergalactic medium with a neutral fraction between 0.1 and 1.0.
As the e-folding time scale for the central accreting black hole is on the
order of a few times 10^7 year, it can grow by one e-folding or less within
this time span.


title:
Gemini Near-infrared Spectroscopy of Luminous z~6 Quasars: Chemical
  Abundances, Black Hole Masses, and MgII Absorption

abstract:
  We present Gemini near-infrared spectroscopic observations of six luminous
quasars at z=5.8$\sim$6.3. Five of them were observed using Gemini-South/GNIRS,
which provides a simultaneous wavelength coverage of 0.9--2.5 $\mu$m in cross
dispersion mode. The other source was observed in K band with
Gemini-North/NIRI. We calculate line strengths for all detected emission lines
and use their ratios to estimate gas metallicity in the broad-line regions of
the quasars. The metallicity is found to be supersolar with a typical value of
$\sim$4 Z_{\sun}, and a comparison with low-redshift observations shows no
strong evolution in metallicity up to z$\sim$6. The FeII/MgII ratio of the
quasars is 4.9+/-1.4, consistent with low-redshift measurements. We estimate
central BH masses of 10^9 to 10^{10} M_{\sun} and Eddington luminosity ratios
of order unity. We identify two MgII $\lambda\lambda$2796,2803 absorbers with
rest equivalent width W_0^{\lambda2796}>1 \AA at 2.2<z<3 and three MgII
absorbers with W_0^{\lambda2796}>1.5 \AA at z>3 in the spectra, with the two
most distant absorbers at z=4.8668 and 4.8823, respectively. The redshift
number densities (dN/dz) of MgII absorbers with W_0^{\lambda2796}>1.5 \AA are
consistent with no cosmic evolution up to z>4.


title:
Multipoint correlation functions in Liouville field theory and minimal
  Liouville gravity

abstract:
  We study n+3-point correlation functions of exponential fields in Liouville
field theory with n degenerate and 3 arbitrary fields. An analytical expression
for these correlation functions is derived in terms of Coulomb integrals. The
application of these results to the minimal Liouville gravity is considered.


title: Interface effects at a half-metal/ferroelectric junction

abstract:
  Magnetoelectric effects are investigated ab-initio at the interface between
half-metallic and ferroelectric prototypes: Heusler Co$_2$MnSi and perovskite
BaTiO$_3$. For the Co-termination ferroelectricity develops in BaTiO$_3$ down
to nanometer thicknesses, whereas for the MnSi-termination a paraelectric and a
ferroelectric state energetically compete, calling for a full experimental
control over the junction atomic configuration whenever a ferroelectric barrier
is needed. Switch of the electric polarization largely affects magnetism in
Co$_2$MnSi, with magnetoelectric coupling due to electronic hybridization at
the MnSi termination and to structural effects at the Co-termination.
Half-metallicity is lost at the interface, but recovered already in the
subsurface layer.


title:
Velocity Renormalization and Carrier Lifetime in Graphene from
  Electron-Phonon Interaction

abstract:
  We present a first-principles investigation of the phonon-induced electron
self-energy in graphene. The energy dependence of the self-energy reflects the
peculiar linear bandstructure of graphene and deviates substantially from the
usual metallic behavior. The effective band velocity of the Dirac fermions is
found to be reduced by 4-8%, depending on doping, by the interaction with
lattice vibrations. Our results are consistent with the observed linear
dependence of the electronic linewidth on the binding energy in photoemission
spectra.


title:
Deformation Quantization of Nonholonomic Almost Kahler Models and
  Einstein Gravity

abstract:
  Nonholonomic distributions and adapted fame structures on (pseudo) Riemannian
manifolds of even dimension are employed to build structures equivalent to
almost Kahler geometry and which allows to perform a Fedosov-like quantization
of gravity. The nonlinear connection formalism that was formally elaborated for
Lagrange and Finsler geometry is implemented in classical and quantum Einstein
gravity.


title:
Good reductions of Shimura varieties of Hodge type in arbitrary
  unramified mixed characteristic. Part I

abstract:
  We prove the existence of good smooth integral models of Shimura varieties of
Hodge type in arbitrary unramified mixed characteristic $(0,p)$. As a first
application we provide a smooth solution (answer) to a conjecture (question) of
Langlands for Shimura varieties of Hodge type. As a second application we prove
the existence in arbitrary unramified mixed characteristic $(0,p)$ of integral
canonical models of projective Shimura varieties of Hodge type with respect to
h--hyperspecial subgroups as pro-\'etale covers of N\'eron models; this forms
progress towards the proof of conjectures of Milne and Reimann. Though the
second application was known before in some cases, its proof is new and more of
a principle.


title:
Quasi-conformal actions, quaternionic discrete series and twistors:
  SU(2,1) and G_2(2)

abstract:
  Quasi-conformal actions were introduced in the physics literature as a
generalization of the familiar fractional linear action on the upper half
plane, to Hermitian symmetric tube domains based on arbitrary Jordan algebras,
and further to arbitrary Freudenthal triple systems. In the mathematics
literature, quaternionic discrete series unitary representations of real
reductive groups in their quaternionic real form were constructed as degree 1
cohomology on the twistor spaces of symmetric quaternionic-Kahler spaces. These
two constructions are essentially identical, as we show explicitly for the two
rank 2 cases SU(2,1) and G_{2(2)}. We obtain explicit results for certain
principal series, quaternionic discrete series and minimal representations of
these groups, including formulas for the lowest K-types in various
polarizations. We expect our results to have applications to topological
strings, black hole micro-state counting and to the theory of automorphic
forms.


title: n-Boson Energies at Finite Volume and Three-Boson Interactions

abstract:
  We calculate the volume dependence of the ground-state energy of n identical
bosons with short-range repulsive interactions in a periodic spatial volume of
side L, up to and including terms of order 1/L^6. With this result, Lattice QCD
calculations of the ground-state energies of three or more pions will allow for
a systematic extraction of the three-pion interaction at this order in the
volume expansion.


title:
Comment about the "Gravity coupled to a scalar field in extra
  dimensions" paper

abstract:
  Wehus and Ravndal have argued that in d + 1 dimensions the general solution
for gravity minimally coupled to a scalar field can not be explicitly written
in Schwarzschild coordinates. We contest these objections.


title: Spreading of sexually transmitted diseases in heterosexual populations

abstract:
  The spread of sexually transmitted diseases (e.g. Chlamydia, Syphilis,
Gonorrhea, HIV) across populations is a major concern for scientists and health
agencies. In this context, both data collection on sexual contact networks and
the modeling of disease spreading, are intensively contributing to the search
for effective immunization policies. Here, the spreading of sexually
transmitted diseases on bipartite scale-free graphs, representing heterosexual
contact networks, is considered. We analytically derive the expression for the
epidemic threshold and its dependence with the system size in finite
populations. We show that the epidemic outbreak in bipartite populations, with
number of sexual partners distributed as in empirical observations from
national sex surveys, takes place for larger spreading rates than for the case
in which the bipartite nature of the network is not taken into account.
Numerical simulations confirm the validity of the theoretical results. Our
findings indicate that the restriction to crossed infections between the two
classes of individuals (males and females) has to be taken into account in the
design of efficient immunization strategies for sexually transmitted diseases.


title: Disease spreading in populations of moving agents

abstract:
  We study the effect of motion on disease spreading in a system of random
walkers which additionally perform long-distance jumps. A small percentage of
jumps in the agent motion is sufficient to destroy the local correlations and
to produce a large drop in the epidemic threshold, well explained in terms of a
mean-field approximation. This effect is similar to the crossover found in
static small-world networks, and can be furthermore linked to the structural
properties of the dynamical network of agent interactions.


title: Resolutions of non-regular Ricci-flat Kahler cones

abstract:
  We present explicit constructions of complete Ricci-flat Kahler metrics that
are asymptotic to cones over non-regular Sasaki-Einstein manifolds. The metrics
are constructed from a complete Kahler-Einstein manifold (V,g_V) of positive
Ricci curvature and admit a Hamiltonian two-form of order two. We obtain
Ricci-flat Kahler metrics on the total spaces of (i) holomorphic C^2/Z_p
orbifold fibrations over V, (ii) holomorphic orbifold fibrations over weighted
projective spaces WCP^1, with generic fibres being the canonical complex cone
over V, and (iii) the canonical orbifold line bundle over a family of Fano
orbifolds. As special cases, we also obtain smooth complete Ricci-flat Kahler
metrics on the total spaces of (a) rank two holomorphic vector bundles over V,
and (b) the canonical line bundle over a family of geometrically ruled Fano
manifolds with base V. When V=CP^1 our results give Ricci-flat Kahler orbifold
metrics on various toric partial resolutions of the cone over the
Sasaki-Einstein manifolds Y^{p,q}.


title:
Dunajski generalization of the second heavenly equation: dressing method
  and the hierarchy

abstract:
  Dunajski generalization of the second heavenly equation is studied. A
dressing scheme applicable to Dunajski equation is developed, an example of
constructing solutions in terms of implicit functions is considered. Dunajski
equation hierarchy is described, its Lax-Sato form is presented. Dunajsky
equation hierarchy is characterized by conservation of three-dimensional volume
form, in which a spectral variable is taken into account.


title: Near-flat space limit and Einstein manifolds

abstract:
  We study the near-flat space limit for strings on AdS(5)xM(5), where the
internal manifold M(5) is equipped with a generic metric with U(1)xU(1)xU(1)
isometry. In the bosonic sector, the limiting sigma model is similar to the one
found for AdS(5)xS(5), as the global symmetries are reduced in the most general
case. When M(5) is a Sasaki-Einstein space like T(1,1), Y(p,q) and L(p,q,r),
whose dual CFT's have N=1 supersymmetry, the near-flat space limit gives the
same bosonic sector of the sigma model found for AdS(5)xS(5). This indicates
the generic presence of integrable subsectors in AdS/CFT.


title: Dynamical Eightfold Way in Strongly Coupled Lattice QCD

abstract:
  We obtain from the quark-gluon dynamics, the Gell'Mann-Ne'eman eightfold way
baryons in an imaginary-time functional integral formulation of 3+1 lattice QCD
in the strong coupling regime (small hopping parameter $\kappa>0$). The model
has ${\rm SU}(3)_c$ gauge and global ${\rm SU}(3)_f$ flavor symmetries. In the
subspace of the physical Hilbert space of vectors with an odd number of quarks,
the baryons are associated with isolated dispersion curves in the
energy-momentum spectrum. The spin 1/2 octet and spin 3/2 decuplet baryons have
asymptotic mass $-3\ln\kappa$ and for each baryon there is an antibaryon with
identical spectral properties. All the masses have the form
$M=-3\ln\kappa-3\kappa^3/4+\kappa^6 r(\kappa)$, with $r(\kappa)$ real analytic.
For each member of the octet $r(\kappa)$ is the same; for each member of the
decuplet, $r(0)$ is the same. So, there is no mass splitting within the octet,
and within the decuplet up to and including ${\cal O}(\kappa^6)$. However,
there is an octet-decuplet mass difference of $3\kappa^6/4+{\cal O}(\kappa^7)$.
The baryon and antibaryon spectrum is the only one up to near the meson-baryon
threshold of nearly $-5\ln\kappa$. A decoupling of hyperplane method is used to
naturally unveil the form of the baryon composite fields (no a priori
guesswork), to show the existence of particles and their multiplicities using a
spectral representation for the two-baryon correlation. We also obtain the
(anti-)baryon dispersion curves which admit the representation $w(\kappa,\vec
p)= -3\ln\kappa -3\kappa^3/4+\kappa^3\sum_{j=1,2,3} (1-\cos ^j)/4+r(\kappa,\vec
p)$, where $r(\kappa,\vec p)$ is of ${\cal O}(\kappa^6)$.


title: Unification of cosmological scalar fields

abstract:
  We present a model where early inflation and late accelerating expansion of
the Universe are driven by the real and imaginary parts of a single complex
scalar field, which we identified as inflaton and phantom field, respectively.
This inflaton-phantom unification is protected by an internal SO(1,1) symmetry,
with the two cosmological scalars appearing as the degrees of freedom of a sole
fundamental representation. The unification symmetry allows to build successful
potentials. We observe that our theory provides a matter-phantom duality, which
transforms scalar matter cosmological solutions into phantom solutions and vice
versa. We also suggest that a complete unification of all scalar fields of
cosmological interest is yet possible under a similar footing.


title: Measurements of Hard-Scattering by PHENIX at RHIC

abstract:
  Hard-scattering in p-p collisions was discovered in 1972 at the CERN-ISR, the
first hadron collider. Techniques were developed and several hard-processes
were discovered which form the basis for many of the measurements made in p-p
and Au+Au collisions at RHIC. Recent measurements of hard-scattering and
related reactions by the PHENIX experiment at RHIC are presented in this
context.


title:
Spatial imaging of modifications to fluorescence lifetime and intensity
  by individual Ag nanoparticles

abstract:
  Highly ordered periodic arrays of silver nanoparticles have been fabricated
which exhibit surface plasmon resonances in the visible spectrum. We
demonstrate the ability of these structures to alter the fluorescence
properties of vicinal dye molecules by providing an additional radiative decay
channel. Using fluorescence lifetime imaging microscopy (FLIM), we have created
high resolution spatial maps of the molecular lifetime components; these show
an order of magnitude increase in decay rate from a localized volume around the
nanoparticles, resulting in a commensurate enhancement in the fluorescence
emission intensity.


title: Statistical physics of the Schelling model of segregation

abstract:
  We investigate the static and dynamic properties of a celebrated model of
social segregation, providing a complete explanation of the mechanisms leading
to segregation both in one- and two-dimensional systems. Standard statistical
physics methods shed light on the rich phenomenology of this simple model,
exhibiting static phase transitions typical of kinetic constrained models,
nontrivial coarsening like in driven-particle systems and percolation-related
phenomena.


title: Structural Fluctuations in the Spin Liquid State of Tb2Ti2O7

abstract:
  High resolution X-ray scattering measurements on single crystal Tb2Ti2O7
reveal finite structural correlations at low temperatures. This geometrically
frustrated pyrochlore is known to exhibit a spin liquid, or cooperative
paramagnetic state, at temperatures below ~ 20 K. Parametric studies of
structural Bragg peaks appropriate to the Fd$\bar{3}$m space group of Tb2Ti2O7
reveal substantial broadening and peak intensity reduction in the temperature
regime 20 K to 300 mK. We also observe a small, anomalous lattice expansion on
cooling below a density maximum at ~ 18 K. These measurements are consistent
with the development of fluctuations above a cooperative Jahn-Teller,
cubic-tetragonal phase transition at very low temperatures.


title:
Travaux pratiques sur les r\'eseaux locaux de type WIFI utilisant des
  simulations num\'eriques des ph\'enom\`enes de propagation des ondes
  \'electromagn\'etiques

abstract:
  The wireless network technology WiFi finds more and more applications in the
industrial field as for the exchange of information between the people or the
equipment. It has the advantage of allowing a great flexibility of the network
but requires precautions of installation to be effective (flow,
reliability...). The fitter of such a network must have knowledge to install
and configure the materials (access points, wifi interface) but also of
knowledge in propagation of electromagnetic waves which is the support of the
transmission of data. The teaching of this technology requires practical works
which must make it possible for the student to implement this knowledge. This
article presents the various means of calculations which we implemented within
the framework of practical works to allow the student to visualize and thus to
better control the phenomena of propagation existing in a WiFI network.


title: Fractional quantization of ballistic conductance in 1D hole systems

abstract:
  We analyze the fractional quantization of the ballistic conductance
associated with the light and heavy holes bands in Si, Ge and GaAs systems. It
is shown that the formation of the localized hole state in the region of the
quantum point contact connecting two quasi-1D hole leads modifies drastically
the conductance pattern. Exchange interaction between localized and propagating
holes results in the fractional quantization of the ballistic conductance
different from those in electronic systems. The value of the conductance at the
additional plateaux depends on the offset between the bands of the light and
heavy holes, \Delta, and the sign of the exchange interaction constant. For
\Delta=0 and ferromagnetic exchange interaction, we observe additional plateaux
around the values 7e^{2}/4h, 3e^{2}/h and 15e^{2}/4h, while antiferromagnetic
interaction plateaux are formed around e^{2}/4h, e^{2}/h and 9e^{2}/4h. For
large \Delta, the single plateau is formed at e^2/h.


title: Plasma Lens for Us Based Super Neutrino Beam at Either FNAL or BNL

abstract:
  The plasma lens concept is examined as an alternative to focusing horns and
solenoids for a neutrino beam facility. The concept is based on a combined
high-current lens/target configuration. Current is fed at an electrode located
downstream from the beginning of the target where pion capturing is needed. The
current is carried by plasma outside the target. A second plasma lens section,
with an additional current feed, follows the target. The plasma is immersed in
a relatively small solenoidal magnetic field to facilitate its current profile
shaping to optimize pion capture. Simulations of the not yet fully optimized
configuration yielded a 25% higher neutrino flux at a detector situated at 3 km
from the target than the horn system for the entire energy spectrum and a
factor of 2.5 higher flux for neutrinos with energy larger than 3 GeV. A major
advantage of plasma lenses is in background reduction. In antineutrino
operation, neutrino background is reduced by a factor of close to 3 for the
whole spectrum, and for energy larger than 3 GeV, neutrino background is
reduced by a factor of 3.6. Plasma lenses have additional advantages: larger
axial currents, high signal purity: minimal neutrino background in antineutrino
runs. The lens medium consists of plasma, consequently, particle absorption and
scattering is negligible. Withstanding high mechanical and thermal stresses in
a plasma is not an issue.


title: High Resolution Spectroscopy of Two-Dimensional Electron Systems

abstract:
  Spectroscopic methods involving the sudden injection or ejection of electrons
in materials are a powerful probe of electronic structure and interactions.
These techniques, such as photoemission and tunneling, yield measurements of
the "single particle" density of states (SPDOS) spectrum of a system. The SPDOS
is proportional to the probability of successfully injecting or ejecting an
electron in these experiments. It is equal to the number of electronic states
in the system able to accept an injected electron as a function of its energy
and is among the most fundamental and directly calculable quantities in
theories of highly interacting systems. However, the two-dimensional electron
system (2DES), host to remarkable correlated electron states such as the
fractional quantum Hall effect, has proven difficult to probe
spectroscopically. Here we present an improved version of time domain
capacitance spectroscopy (TDCS) that now allows us to measure the SPDOS of a
2DES with unprecedented fidelity and resolution. Using TDCS, we perform
measurements of a cold 2DES, providing the first direct measurements of the
single-particle exchange-enhanced spin gap and single particle lifetimes in the
quantum Hall system, as well as the first observations of exchange splitting of
Landau levels not at the Fermi surface. The measurements reveal the difficult
to reach and beautiful structure present in this highly correlated system far
from the Fermi surface.


title:
Theory of spin, electronic and transport properties of the lateral
  triple quantum dot molecule in a magnetic field

abstract:
  We present a theory of spin, electronic and transport properties of a
few-electron lateral triangular triple quantum dot molecule in a magnetic
field. Our theory is based on a generalization of a Hubbard model and the
Linear Combination of Harmonic Orbitals combined with Configuration Interaction
method (LCHO-CI) for arbitrary magnetic fields. The few-particle spectra
obtained as a function of the magnetic field exhibit Aharonov-Bohm
oscillations. As a result, by changing the magnetic field it is possible to
engineer the degeneracies of single-particle levels, and thus control the total
spin of the many-electron system. For the triple dot with two and four
electrons we find oscillations of total spin due to the singlet-triplet
transitions occurring periodically in the magnetic field. In the three-electron
system we find a transition from a magnetically frustrated to the
spin-polarized state. We discuss the impact of these phase transitions on the
addition spectrum and the spin blockade of the lateral triple quantum dot
molecule.


title: Quantum transport in electron Fabry-Perot interferometers

abstract:
  We report experiments on Fabry-Perot electron interferometers in the integer
quantum Hall regime. The GaAs/AlGaAs heterostructure devices consist of two
constrictions defined by etch trenches in 2D electron layer, enclosing an
approximately circular island. The interferometer is formed by
counterpropagating chiral edge channels coupled by tunneling in the two
constrictions. Interference fringes are observed as conductance oscillations,
similar to the Aharonov-Bohm effect. Front gates deposited in etch trenches
allow to fine-tune the device and to change the constriction filling f relative
to the bulk filling. Quantum-coherent conductance oscillations are observed on
the f = 1 - 4 plateaus. On plateau f we observe f conductance oscillations per
fundamental flux period h/e. This is attributed to the dominance of the
electron-electron Coulomb interaction, effectively mixing Landau level
occupation. On the other hand, the back-gate charge period is the same (one
electron) on all plateaus, independent of filling. This is attributed to the
self-consistent electrostatics in the large electron island. We also report
dependence of the oscillation period on front-gate voltage for f = 1, 2 and 4
for three devices. We find a linear dependence, with the slope inversely
proportional to f for f = 1 and 2.


title: On the formation of TeV radiation in LS 5039

abstract:
  The recent detections of TeV gamma-rays from compact binary systems show that
relativistic outflows (jets or winds) are sites of effective acceleration of
particles up to multi-TeV energies. In this paper, we discuss the conditions of
acceleration and radiation of ultra-relativistic electrons in LS 5039, the
gamma-ray emitting binary system for which the highest quality TeV data are
available. Assuming that the gamma-ray emitter is a jet-like structure, we
performed detailed numerical calculations of the energy spectrum and
lightcurves accounting for the acceleration efficiency, the location of the
accelerator, the speed of the emitting flow, the inclination angle of the
system, as well as specific features related to anisotropic inverse Compton
scattering and pair production. We conclude that the accelerator should not be
deep inside the binary system unless we assume a very efficient acceleration
rate. We show that within the IC scenario both the gamma-ray spectrum and flux
are strongly orbital phase dependent. Formally, our model can reproduce, for
specific sets of parameter values, the energy spectrum of gamma-rays reported
by HESS for wide orbital phase intervals. However, the physical properties of
the source can be constrained only by observations capable of providing
detailed energy spectra for narrow orbital phase intervals ($\Delta\phi\ll
0.1$).


title: The Nonlinear Evolution of Galaxy Intrinsic Alignments

abstract:
  The non-Gaussian contribution to the intrinsic halo spin alignments is
analytically modeled and numerically detected. Assuming that the growth of
non-Gaussianity in the density fluctuations caused the tidal field to have
nonlinear-order effect on the orientations of the halo angular momentum, we
model the intrinsic halo spin alignments as a linear scaling of the density
correlations on large scales, which is different from the previous
quadratic-scaling model based on the linear tidal torque theory. Then, we
analyze the halo catalogs from the recent high-resolution Millennium Run
simulation at four different redshifts (z=0,0.5,1 and 2) and measure
quantitatively the degree of the nonlinear effect on the halo spin alignments
and its changes with redshifts. A clear signal of spin correlations is found on
scales as large as 10 Mpc/h at z=0, which marks a detection of the nonlinear
tidal effect on the intrinsic halo alignments. We also investigate how the
nonlinear effect depends on the intrinsic properties of the halos. It is found
that the degree of the nonlinear tidal effect increases as the halo mass scale
decreases, the halo specific angular momentum increases, and the halo peculiar
velocity decreases. We discuss implication of our result on the weak
gravitational lensing.


title: The MACRO Experiment at Gran Sasso

abstract:
  In this overview of the MACRO experiment we recall the structure of the
detector and discuss several physics topics: atmospheric neutrinos and neutrino
oscillations, high energy neutrino astronomy, searches for WIMPs and for low
energy stellar gravitational collapse neutrinos, stringent upper limits on GUT
magnetic monopoles, high energy downgoing muons, primary cosmic ray composition
and shadowing of primary cosmic rays by the Moon and the Sun.


title:
Superconducting proximity effect and Majorana fermions at the surface of
  a topological insulator

abstract:
  We study the proximity effect between an s-wave superconductor and the
surface states of a strong topological insulator. The resulting two dimensional
state resembles a spinless p_x+ip_y superconductor, but does not break time
reversal symmetry. This state supports Majorana bound states at vortices. We
show that linear junctions between superconductors mediated by the topological
insulator form a non chiral 1 dimensional wire for Majorana fermions, and that
circuits formed from these junctions provide a method for creating,
manipulating and fusing Majorana bound states.


title:
Simulating cosmic rays in clusters of galaxies - III. Non-thermal
  scaling relations and comparison to observations

abstract:
  Complementary views of galaxy clusters in the radio synchrotron, hard X-ray
inverse Compton, and high-energy gamma-ray regimes are critical in calibrating
them as high-precision cosmological probes. We present predictions for scaling
relations between cluster mass and these non-thermal observables. To this end,
we use high-resolution simulations of a sample of galaxy clusters spanning a
mass range of almost two orders of magnitudes, and follow self-consistent
cosmic ray physics on top of the radiative hydrodynamics. Calibrating the
magnetic fields of our model with Faraday rotation measurements (RM), the
synchrotron emission of our relativistic electron populations matches the radio
synchrotron luminosities and morphologies of observed giant radio halos and
mini-halos surprisingly well. Using the complete sample of the brightest X-ray
clusters observed by ROSAT in combination with our gamma-ray scaling relation,
we predict GLAST will detect about ten clusters allowing for Eddington bias due
to the scatter in the scaling relation. The brightest gamma-ray clusters are
Ophiuchus, Fornax, Coma, A3627, Perseus, and Centaurus. We provide an absolute
lower flux limit for the gamma-ray emission of Coma in the hadronic model which
can be made tighter for magnetic field values derived from RM values to match
the GLAST sensitivity, providing thus a unique test for the possible hadronic
origin of radio halos. Our predicted hard X-ray emission, due to inverse
Compton emission of shock accelerated and hadronically produced relativistic
electrons, falls short of the detections in Coma and Perseus by a factor of 50.
This casts doubts on the inverse Compton interpretation and reinforces the
known discrepancy of magnetic field estimates from Faraday RM values and those
obtained by combining synchrotron and inverse Compton emission. [abridged]


title: Precise predictions for B -> Xs l+ l- in the large q^2 region

abstract:
  The inclusive B -> Xs l+ l- decay rate in the large q^2 region (q^2 >
m_{\psi'}^2) receives significant nonperturbative corrections. The resulting
uncertainties can be drastically reduced by normalizing the rate to the B -> Xu
l nu rate with the same q^2 cut, which allows for much improved tests of short
distance physics. We calculate this ratio, including the order 1/m_b^3
nonperturbative corrections and the analytically known NNLO perturbative
corrections. Since in the large q^2 region an inclusive measurement may be
feasible via a sum over exclusive states, our results could be useful for
measurements at LHCb and possibly for studies of B -> Xd l+ l-.