title:
Broad-band X-ray spectral evolution of GX 339-4 during a state
  transition

abstract:
  We report on X-ray and soft gamma-ray observations of the black-hole
candidate GX 339-4 during its 2007 outburst, performed with the RXTE and
INTEGRAL satellites. The hardness-intensity diagram of all RXTE/PCA data
combined shows a q-shaped track similar to that observed in previous
outbursts.The evolution in the diagram suggested that a transition from
hard-intermediate state to soft-intermediate state occurred, simultaneously
with INTEGRAL observations performed in March. The transition is confirmed by
the timing analysis presented in this work, which reveals that a weak type-A
quasi-periodic oscillation (QPO) replaces a strong type-C QPO. At the same
time, spectral analysis shows that the flux of the high-energy component shows
a significant decrease in its flux. However, we observe a delay (roughly one
day) between variations of the spectral parameters of the high-energy component
and changes in the flux and timing properties. The changes in the high-energy
component can be explained either in terms the high-energy cut-off or in terms
of a variations in the reflection component. We compare our results with those
from a similar transition during the 2004 outburst of GX 339-4.


title: Quantum Self-Correcting Stabilizer Codes

abstract:
  In this paper, we explicitly construct (Abelian) anyonic excitations of
arbitrary stabilizer Hamiltonians which are local on a 2D lattice of qubits.
This leads directly to the conclusion that, in the presence of local thermal
noise, such systems cannot be used for the fault-tolerant storage of quantum
information by self-correction i.e. they are ruled out as candidates for a
`quantum hard drive'. We suggest that in 3D, the same construction leads to an
argument that self-correction is impossible.


title: Dynamics of Solutions of $f(R)$ Theory

abstract:
  We use the correspondence between the $f(R)$ theory and an Einstein-scalar
field system to study late-time dynamics of solutions of $f(R)$ theory. We
discuss how reasonable assumptions on the potential of the scalar field lead to
restrictions on the function $f(R)$ and use known results for the scalar field
system to gain results on solutions of the $f(R)$ theory. In particular, we
prove accelerated expansion at late times for several different categories of
functions $f(R)$ that satisfy certain restrictions.


title:
Metal-insulator transition in the Hartree-Fock phase diagram of the
  fully polarized homogeneous electron gas in two dimensions

abstract:
  We determine numerically the ground state of the two-dimensional, fully
polarized electron gas within the Hartree-Fock approximation without imposing
any particular symmetries on the solutions. At low electronic densities, the
Wigner crystal solution is stable, but for higher densities ($r_s$ less than
$\sim 2.7$) we obtain a ground state of different symmetry: the charge density
forms a triangular lattice with about 11% more sites than electrons. We prove
analytically that this conducting state with broken translational symmetry has
lower energy than the uniform Fermi gas state in the high density region giving
rise to a metal to insulator transition.


title: Rapidity gap survival probability and total cross sections

abstract:
  We discuss recent calculations of the survival probability of the large
rapidity gaps in exclusive processes of the type pp --> p+A+p at high energies.
Absorptive or screening effects are important, and one consequence is that the
total cross section at the LHC is predicted to be only about 90 mb.


title:
Upper Limits on the VHE gamma-ray Emission from the Willman 1 Satellite
  Galaxy with the MAGIC telescope

abstract:
  We present the result of the observation of the ultrafaint dwarf galaxy
Willman 1 performed with the 17 m MAGIC telescope during 15.5 hr between March
and May 2008. No significant $\gamma$-ray emission was found. We derived upper
limits of the order of $10^{-12}$ ph cm$^{-2}$ s$^{-1}$ on the integral flux
above 100 GeV, which we compare with predictions from several of the
established neutralino benchmark models in the mSUGRA parameter space. The
neutralino annihilation spectra are defined after including the recently
quantified contribution of internal bremsstrahlung from the virtual sparticles
that mediate the annihilation. Flux boost factors of three orders of magnitude
are required even in the most optimistic scenario to match our upper limits.
However, uncertainties in the dark matter intrinsic and extrinsic properties
(e.g., presence of substructures, Sommerfeld effect) may significantly reduce
this gap.


title:
The Fermi Gamma Ray Space Telescope discovers the Pulsar in the Young
  Galactic Supernova-Remnant CTA 1

abstract:
  Energetic young pulsars and expanding blast waves (supernova remnants, SNRs)
are the most visible remains after massive stars, ending their lives, explode
in core-collapse supernovae. The Fermi Gamma-Ray Space Telescope has unveiled a
radio quiet pulsar located near the center of the compact synchrotron nebula
inside the supernova remnant CTA 1. The pulsar, discovered through its
gamma-ray pulsations, has a period of 316.86 ms, a period derivative of 3.614 x
10-13 s s-1 . Its characteristic age of 104 years is comparable to that
estimated for the SNR. It is conjectured that most unidentified Galactic gamma
ray sources associated with star-forming regions and SNRs are such young
pulsars.


title:
ESO VLT optical spectroscopy of BL Lacertae objects. III. An extension
  of the sample

abstract:
  We present results of an ongoing program at the ESO VLT for spectroscopy of
BL Lac objects lacking a firm redshift estimate and here we report on 15
objects. For 11 sources we confirm the BL Lac classification, and we determine
new redshifts for 3 objects, 1 with weak emission lines (PKS 1057-79, z=0.569)
and 2 with absorptions from the host galaxy (RBS 1752, z=0.449; RBS 1915,
z=0.243); moreover a sub Damped Lyman Alpha (sub-DLA) system is detected in the
direction of the BL Lac PKS 0823-223 (z>=0.911). For the remaining 8 BL Lacs,
from the very absence of absorption lines of the host galaxy, lower limits to
the redshift are deduced with z_min in the interval 0.20-0.80. The remaining
three sources are reclassified as a FSRQ (PKS 1145-676, z=0.210; TXS 2346+052,
z=0.419) and a misclassified galactic star (PMNJ 1323-3652).


title: The Poisson Channel at Low Input Powers

abstract:
  The asymptotic capacity at low input powers of an average-power limited or an
average- and peak-power limited discrete-time Poisson channel is considered.
For a Poisson channel whose dark current is zero or decays to zero linearly
with its average input power $E$, capacity scales like $E\log\frac{1}{E}$ for
small $E$. For a Poisson channel whose dark current is a nonzero constant,
capacity scales, to within a constant, like $E\log\log\frac{1}{E}$ for small
$E$.


title:
Third order susceptibility: general formalism for photoinduced current
  density in semiconductors

abstract:
  This paper contains a detailed derivation of the photoinduced current density
at third order in the coupling between a semiconductor and a multifrequency
photon field, starting from its standard textbook expression as a third order
time integral of a triple commutator. Due to a major intrinsic problem linked
to this triple commutator, such a derivation has been made possible quite
recently only, thanks to the tools developed in the composite-boson many-body
theory we have just constructed. The photoinduced current density is shown to
ultimately read in a compact form, in terms of the Pauli and Coulomb
scatterings for exciton-exciton interactions introduced in this theory.
Representation in Shiva diagrams is also given to better grasp the physics of
the various contributions.


title: Bs Mixing and Lifetime Difference at CDF

abstract:
  The measurements of the \Bs mixing parameter which describes the difference
in width (the inverse of the lifetime) between the \Bs heavy and light states
are described. These measurements include direct measurement of $\Delta
\Gamma_s$ and $\Gamma_s$ by resolving CP eigenstates by angular analysis and
measurements in which the proportion of CP even and odd is known.


title: Eight-Dimensional Mid-Infrared/Optical Bayesian Quasar Selection

abstract:
  We explore the multidimensional, multiwavelength selection of quasars from
mid-IR (MIR) plus optical data, specifically from Spitzer-IRAC and the Sloan
Digital Sky Survey (SDSS). We apply modern statistical techniques to combined
Spitzer MIR and SDSS optical data, allowing up to 8-D color selection of
quasars. Using a Bayesian selection method, we catalog 5546 quasar candidates
to an 8.0 um depth of 56 uJy over an area of ~24 sq. deg; ~70% of these
candidates are not identified by applying the same Bayesian algorithm to
4-color SDSS optical data alone. Our selection recovers 97.7% of known type 1
quasars in this area and greatly improves the effectiveness of identifying
3.5<z<5 quasars. Even using only the two shortest wavelength IRAC bandpasses,
it is possible to use our Bayesian techniques to select quasars with 97%
completeness and as little as 10% contamination. This sample has a photometric
redshift accuracy of 93.6% (Delta Z +/-0.3), remaining roughly constant when
the two reddest MIR bands are excluded. While our methods are designed to find
type 1 (unobscured) quasars, as many as 1200 of the objects are type 2
(obscured) quasar candidates. Coupling deep optical imaging data with deep
mid-IR data could enable selection of quasars in significant numbers past the
peak of the quasar luminosity function (QLF) to at least z~4. Such a sample
would constrain the shape of the QLF and enable quasar clustering studies over
the largest range of redshift and luminosity to date, yielding significant
gains in our understanding of quasars and the evolution of galaxies.


title:
Improving the performance of the single-dish Cherenkov telescope MAGIC
  through the use of signal timing

abstract:
  The Cherenkov light flashes produced by Extensive Air Showers are very short
in time. A high bandwidth and fast digitizing readout, therefore, can minimize
the influence of the background from the light of the night sky, and improve
the performance in Cherenkov telescopes. The time structure of the Cherenkov
image can further be used in single-dish Cherenkov telescopes as an additional
parameter to reduce the background from unwanted hadronic showers. A
description of an analysis method which makes use of the time information and
the subsequent improvement on the performance of the MAGIC telescope
(especially after the upgrade with an ultra fast 2 GSamples/s digitization
system in February 2007) will be presented. The use of timing information in
the analysis of the new MAGIC data reduces the background by a factor two,
which in turn results in an enhancement of about a factor 1.4 of the flux
sensitivity to point-like sources, as tested on observations of the Crab
Nebula.


title:
Systematic ^{75}As NMR study of the dependence of low-lying excitations
  on F doping in the iron oxypnictide LaFeAs(O_{1-x}F_{x})

abstract:
  We report systematic $^{75}$As NMR studies on LaFeAs(O$_{1-x}$F$_{x}$) ($0\le
x\le0.14$). At $x=0.04$ near the phase boundary, from resistivity, spin-lattice
relaxation rate $1/T_1$, and NMR spectrum measurements, we found weak magnetic
order at $T_N\simeq 30$ K. Antiferromagnetic (AFM) fluctuations proved through
$1/T_1$ are suppressed significantly with F-doping, and pseudogap behavior
without pronounced AFM fluctuations is observed at $x=0.11$ where $T_c$ is
maximum. This significant suppression of $1/T_1T$ upon F-doping while $T_c$
remains nearly unchanged suggests that low-energy AFM fluctuations probed with
$^{75}$As NMR do not play a crucial role in the superconductivity.


title: Precision tests of QCD with jets and vector bosons at HERA and TevaTron

abstract:
  Recent results from HERA and TevaTron on precision tests of QCD with jets, W
and Z bosons and photons associated with jets and heavy flavours are presented.
The measurements were used to probe QCD at the highest energies, to provide
experimental constraints on SM processes that constitute background to new
physics, to extract values of the coupling of the strong interaction and to
constrain the proton parton distribution functions. The implications of the
results on LHC physics are discussed.


title:
The Arecibo Legacy Fast ALFA Survey VII: A Neutral Hydrogen Cloud
  Complex in the Virgo Cluster

abstract:
  We present observations of an HI cloud complex most likely located in the
Virgo galaxy cluster, first reported by Kent et al. (2007). The complex
consists of five clouds, detected in the data set of the ALFALFA extragalactic
HI survey at Arecibo. The clouds have radial velocities between cz~480 and 610
km/s. At the Virgo cluster distance, they are spread over a projected span of
170 kpc and have HI masses ranging from 0.48 to 1.7 x 10^8 Msun. The overall HI
mass of the complex is 5.1 x 10^8 Msun. The clouds' velocity widths vary
between 50 and 250 km/s. New results of follow-up aperture synthesis
observations conducted with the Very Large Array are also presented, which
yield a higher resolution view of two of the clouds in the complex. These two
resolved clouds show no evidence of symmetry in the gas distribution or of any
ordered motions. The possibility that the complex is a group of primordial
objects, embedded in their own dark matter halo is thought to be unlikely.
Scenarios in which the clouds have been removed from the disk of a galaxy
traveling at high speed through the intracluster medium are considered. The
most likely among those is thought to be one where the clouds were separated
from NGC 4445 at a time >0.5 Gyr ago. The orbital velocity of the clouds and
the putative parent galaxy would now be seen at a relatively large angle with
respect to the line of sight.


title:
Dark energy and neutrino mass constraints from weak lensing, supernova,
  and relative galaxy ages

abstract:
  We use the current weak lensing data to constrain the equation of state of
dark energy $w$ and the total mass of massive neutrinos $\sum m_{\nu}$. The
constraint on $w$ would be weak if only the current weak lensing data are used.
With the addition of other observational data such as the type Ia supernovae,
baryon acoustic oscillation, and the high redshift Hubble parameter data $H(z)$
derived from relative galaxy ages to break the degeneracy, the result is
significantly improved. For the pure $w$CDM model without massive neutrinos, we
find $w=-1.00^{+0.10}_{-0.12}$. For the $w$CDM model with the massive neutrino
component, we show that the constraint on $w$ is almost unchanged, there is
very little degeneracy between $w$ and $\sum m_{\nu}$. After marginalizing over
other parameters, we obtain the probability distribution function of $\sum
m_{\nu}$, and find that the upper limit is $\sum m_{\nu} \leq 0.8$ eV at 95.5%
confidence level for the combined data sets. Our constraints of $w$ and $\sum
m_{\nu}$ are both compatible and comparable with the constraints obtained from
the WMAP 5-year data.


title: Double Kelvin Wave Cascade in Superfluid Helium

abstract:
  We study the double cascade of energy and wave action in a local model of
superfluid vortex filaments. The model is obtained from a truncated expansion
of the 2D Local Induction Approximation and it is shown to support six-wave
interactions. We argue that, because of the uncertainty in the vortex core
profile, this model has the same status of validity as the traditionally used
Biot-Savart model with cutoff, but it has advantage of being much simpler. Our
minimal model leads to a wave kinetic equation for which we predict existence
of two distinct power-law scaling in the spectrum, corresponding to a direct
cascade of energy and an inverse one of wave action. Direct numerical
simulations confirm the theoretical predictions in the weak turbulence regime.


title: Prospects for standard SUSY searches at the LHC

abstract:
  We present the recent prospects and strategies of the ATLAS and CMS
experiments in the search for signatures of Supersymmetry. The emphasis is
placed on standard signatures with missing transverse energy and on the initial
data taking periods.


title: B -> chi_cJ K decays revisited

abstract:
  We demonstrate that exclusive B decays to P-wave charmonium factorize in the
non-relativistic limit provided that colour-octet contributions are taken into
account, and estimate the branching fractions. Although there are very large
uncertainties, we find reasonable parameter choices, where the main features of
the data -- large corrections to (naive) factorization and suppression of the
chi_{c2} and h_c final states -- are reproduced though the suppression of
chi_{c2} is not as strong as seen in the data. Our results also provide an
example, where an endpoint divergence in hard spectator-scattering factorizes
and is absorbed into colour-octet operator matrix elements.


title:
High domain wall velocity at zero magnetic field induced by low current
  densities in spin-valve nanostripes

abstract:
  Current-induced magnetic domain wall motion at zero magnetic field is
observed in the permalloy layer of a spin-valve-based nanostripe using
photoemission electron microscopy. The domain wall movement is hampered by
pinning sites, but in between them high domain wall velocities (exceeding 150
m/s) are obtained for current densities well below $10^{12} \unit{A/m^2}$,
suggesting that these trilayer systems are promising for applications in domain
wall devices in case of well controlled pinning positions. Vertical spin
currents in these structures provide a potential explanation for the increase
in domain wall velocity at low current densities.


title:
A Multiwavelength View of Star Formation in Interacting Galaxies in the
  Pavo Group

abstract:
  We combine Spitzer IRAC mid-infrared (MIR) and Chandra X-ray observations of
the dominant galaxies NGC6872 and NGC6876 in the Pavo group with archival
optical and HI data to study interaction-induced star formation. In spiral
galaxy NGC6872, 8.0 and 5.8 micron nonstellar emission having colors consistent
with polycyclic aromatic hydrocarbons (PAHs) is concentrated in clumps in three
regions: in a 5 kpc radius outer ring about the center of the spiral galaxy, in
a bridge of emission connecting NGC6872's northern spiral arm to IC4970, and
along the full extent of NGC6872's tidal arms. PAH emission is correlated with
young star clusters and dense HI regions. We find no strong differences in the
MIR colors of star-forming regions in the spiral galaxy NGC6872 as a function
of position relative to the tidally interacting companion galaxy IC4970. We
find 11 very luminous X-ray sources (>~ (0.5 - 5) x 10^{39} ergs/s) clustered
to the southwest in NGC6872, near bright star-forming regions. In NGC6872's
tidal features, young star clusters form at the boundaries of diffuse X-ray
gas, suggesting that stars form as gas stripped by the interactions cools. The
nucleus of NGC6872 is a weak X-ray point source (0.5-8 keV luminosity of 8.5 x
10^{39} ergs/s), but there is little evidence in the inner 1 kpc of NGC6872 for
PAH emission from recent star formation or nuclear activity. However, a 4 kpc
`stream', leading from the outer ring of NGC6872 to the nucleus, may signal
transport of interstellar matter into NGC6872's nuclear region. Nonstellar
emission, consistent with PAH emission, is also found in the central region of
elliptical galaxy NGC6877, companion to dominant Pavo group elliptical NGC6876.
However, in the central region of NGC6876, the dust emission is more likely due
to silicate emission from old AGB stars.


abstract:
  In this paper we compute Hochschild homology of certain Soergel bimodules.
Moreover, we describe explicitly the graded bimodule maps between Soergel
bimodules. This computations are motivated by the categorifications of the
colored HOMFLY-PT polynomial for links via Hochschild homology of Soergel
bimodules.


title: Hierarchical Bag of Paths for Kernel Based Shape Classification

abstract:
  Graph kernels methods are based on an implicit embedding of graphs within a
vector space of large dimension. This implicit embedding allows to apply to
graphs methods which where until recently solely reserved to numerical data.
Within the shape classification framework, graphs are often produced by a
skeletonization step which is sensitive to noise. We propose in this paper to
integrate the robustness to structural noise by using a kernel based on a bag
of path where each path is associated to a hierarchy encoding successive
simplifications of the path. Several experiments prove the robustness and the
flexibility of our approach compared to alternative shape classification
methods.


title:
The Blazar Sequence and the Cosmic Gamma-Ray Background Radiation in the
  Fermi Era

abstract:
  (Abridged) We present a new model of the blazar gamma-ray luminosity function
(GLF) and the spectrum of the extragalactic gamma-ray background (EGRB), which
is consistent with the observed distributions of EGRET blazars. The unified
sequence of blazar spectral energy distribution (SED) is taken into account to
make a non-trivial prediction for the EGRB spectrum and more realistic
comparison with the data than previous studies. We then try to explain the EGRB
data by the two AGN populations: one is blazars, and the other is non-blazar
AGNs that are responsible for the EGRB in the MeV band. We find that ~80% of
the EGRB photon flux at > 100 MeV can be explained by the sum of the two
populations, while ~45% can be accounted for only by blazars. The predicted
EGRB spectrum is in agreement with a wide range of the observed data from X-ray
to GeV, within the systematic uncertainties in the EGRB determination by EGRET.
These results indicate that AGNs including blazars are the primary source of
EGRB. Blazars are dominant in EGRB at higher energy bands of >100 MeV, while
non-blazar AGNs dominate at <100 MeV. Almost all of the EGRB flux from blazars
will be resolved into discrete sources by the Fermi Gamma-ray Space Telescope,
while that from non-blazar AGNs will largely remain unresolved. Therefore,
comparison between the integrated source counts and diffuse EGRB flux as a
function of photon energy will give a simple and clear test of our model.
Various quantitative predictions for Fermi observations are also made.
Especially, our model predicts 600-1200 blazars in all sky down to 2e-9
photons/cm^-2/s (>100 MeV), which is considerably smaller than most of previous
studies.


title: Recursive Concurrent Stochastic Games

abstract:
  We study Recursive Concurrent Stochastic Games (RCSGs), extending our recent
analysis of recursive simple stochastic games to a concurrent setting where the
two players choose moves simultaneously and independently at each state. For
multi-exit games, our earlier work already showed undecidability for basic
questions like termination, thus we focus on the important case of single-exit
RCSGs (1-RCSGs).
  We first characterize the value of a 1-RCSG termination game as the least
fixed point solution of a system of nonlinear minimax functional equations, and
use it to show PSPACE decidability for the quantitative termination problem. We
then give a strategy improvement technique, which we use to show that player 1
(maximizer) has \epsilon-optimal randomized Stackless & Memoryless (r-SM)
strategies for all \epsilon > 0, while player 2 (minimizer) has optimal r-SM
strategies. Thus, such games are r-SM-determined. These results mirror and
generalize in a strong sense the randomized memoryless determinacy results for
finite stochastic games, and extend the classic Hoffman-Karp strategy
improvement approach from the finite to an infinite state setting. The proofs
in our infinite-state setting are very different however, relying on subtle
analytic properties of certain power series that arise from studying 1-RCSGs.
  We show that our upper bounds, even for qualitative (probability 1)
termination, can not be improved, even to NP, without a major breakthrough, by
giving two reductions: first a P-time reduction from the long-standing
square-root sum problem to the quantitative termination decision problem for
finite concurrent stochastic games, and then a P-time reduction from the latter
problem to the qualitative termination problem for 1-RCSGs.


title:
Time-dependent angular analysis of the decays $B_{d}^{0}\to J/\psi
  K^{*0}$ and $B_{s}^{0}\to J/\psi \phi$

abstract:
  In this paper we present the description of the flavor-untagged decays
$B_{d}^{0}\to J/\psi K^{*0}$ and $B_{s}^{0}\to J/\psi \phi$ in the transversity
basis. The study of these $B$ mesons in that basis makes it possible to extract
information about flavor SU(3) (or U(3)) symmetry and to verify if the
factorization assumption is feasible for the decay $B_{d}^{0}\to J/\psi
K^{*0}$. The lifetime ratio $\tau_{s}/\tau_{d}$ is also extracted with this
description.


title: Measurement of the W mass with the ATLAS detector

abstract:
  We investigate the posibility of improving the W mass measurement at ATLAS.
Given the high statistics of both W and Z bosons expected at the LHC, we
estimate that a precision of 7 MeV per channel can be reached with 10 fb-1 of
data.


title:
Infrared Spectroscopy and Analysis of Brown Dwarf and Planetary Mass
  Objects in the Orion Nebula Cluster

abstract:
  We present near-infrared long slit and multi-slit spectra of low mass brown
dwarf candidates in the Orion Nebula Cluster. The long slit data were observed
in the H- & K-bands using NIRI on the Gemini North Telescope. The multi-object
spectroscopic observations were made using IRIS2 on the Anglo Australian
Telescope at H-band. We develop a spectral typing scheme based on optically
calibrated, near infrared spectra of young sources in the Taurus and IC 348
star forming regions with spectral types M3.0 to M9.5. We apply our spectral
typing scheme to 52 sources, including previously published UKIRT and GNIRS
spectra. 40 objects show strong water absorption with spectral types of M3 to
>M9.5. The latest type objects are provisionally classified as early L types.
We plot our sources on H-R diagrams overlaid with theoretical pre-main-sequence
isochrones. The majority of our objects lie close to or above the 1 Myr
isochrone, leading to an average cluster age that is <1 Myr. We find 38 sources
lie at or below the hydrogen burning limit (0.075 Msun). 10 sources potentially
have masses below the deuterium burning limit (0.012 Msun). We use a Monte
Carlo approach to model the observed luminosity function with a variety of
cluster age and mass distributions. The lowest chi^2 values are produced by an
age distribution centred at 1 Myr, with a mass function that declines at
sub-stellar masses according to an M^alpha power law in the range alpha=0.3 to
0.6. We find that truncating the mass function at 0.012 Msun produces
luminosity functions that are starved of the faintest magnitudes, even when
using bimodal age populations that contain 10 Myr old sources. The results of
these Monte Carlo simulations therefore support the existence of a planetary
mass population in the ONC.


title: Flatband localization in the Anderson-Falicov-Kimball model

abstract:
  The insulator-metal-insulator transition caused by a flatband is analyzed
within dynamical mean-field theory using the Anderson-Falicov-Kimball model. We
observe quantitative disagreement between the present approach and previous
results. The presence of interactions enhances delocalization.


title: FCNC-induced semileptonic decays of $J/\psi$ in the Standard Model

abstract:
  In this work, we calculate the form factors for $J/\psi\to \bar{D}^{(*)0}$
induced by the flavor changing neutral currents (FCNC) in terms of the QCD sum
rules. Making use of these form factors, we further calculate the branching
fractions of semileptonic decays $J/\psi \to \bar{D}^{(*)0} l ^+ l^-$ ($l=e,
\mu$). In particular, we formulate the matrix element $<J/\psi|T_{\mu\nu}|
\bar{D}^{*0}>$ with $T_{\mu\nu}$ being a tensor current, which was not fully
discussed in previous literature. Our analysis indicates that if only the
standard model (SM) applies, the production of single charmed mesons at the
present electron-positron colliders is too small to be observed even the
resonance effects are included, therefore if an anomalous production rates are
observed, it would be a hint of new physics beyond SM. Even though the
predicted branching ratios are beyond the reach of present facilities which can
be seen from a rough order estimate, the more accurate formulation of the three
point correlation function derived in this work has theoretical significance
and the technique can also be applied to other places. In analog to some
complicated theoretical derivations which do not have immediate
phenomenological application yet, if the future experiments can provide
sufficient luminosity and accuracy, the results would be helpful.


title:
Notes de lecture de l'article "Partial sums of the M\"obius function" de
  Kannan Soundararajan

abstract:
  Kannan Soundararajan recently obtained a new estimate, conditional to the
Riemann hypothesis, for the summatory function of the Mobius function. In this
expository article we describe his method, with detailed computations.


title:
First results from 2+1 dynamical quark flavors on an anisotropic
  lattice: light-hadron spectroscopy and setting the strange-quark mass

abstract:
  We present the first light-hadron spectroscopy on a set of $N_f=2+1$
dynamical, anisotropic lattices. A convenient set of coordinates that
parameterize the two-dimensional plane of light and strange-quark masses is
introduced. These coordinates are used to extrapolate data obtained at the
simulated values of the quark masses to the physical light and strange-quark
point. A measurement of the Sommer scale on these ensembles is made, and the
performance of the hybrid Monte Carlo algorithm used for generating the
ensembles is estimated.


title: Transverse Force on Quarks in DIS

abstract:
  The interaction dependent part of the $x^2$-moment of the twist-3 polarized
parton distribution $g_2(x)$ is related to the transverse force acting on the
active quark in deep-inelastic scattering off a transversely polarized nucleon
immediately after it has absorbed the virtual photon. Similarly, the
$x^2$-moment of the chirally odd twist-3 unpolarized parton distribution $e(x)$
can be related to the transverse force experienced by a transversely polarized
quark ejected from a transversely polarized nucleon.


title:
On the convergence of the hp-BEM with quasi-uniform meshes for the
  electric field integral equation on polyhedral surfaces

abstract:
  In this paper the hp-version of the boundary element method is applied to the
electric field integral equation on a piecewise plane (open or closed)
Lipschitz surface. The underlying meshes are supposed to be quasi-uniform. We
use H(div)-conforming discretisations with quadrilateral elements of
Raviart-Thomas type and establish quasi-optimal convergence of
hp-approximations. Main ingredient of our analysis is a new
H^{-1/2}(div)-conforming p-interpolation operator that assumes only H^r \cap
H^{-1/2}(div)-regularity (r > 0) and for which we show quasi-stability with
respect to polynomial degrees.


title:
Are low-degree p mode frequencies predictable from one cycle to the
  next?

abstract:
  The Birmingham Solar-Oscillations Network (BiSON) has been collecting data
for over 30yrs and so observations span nearly three 11yr solar activity
cycles. This allows us to address important questions concerning the solar
cycle and its effect on solar oscillations, such as: how consistent is the
acoustic behaviour from one cycle to the next? We have used the p-mode
frequencies observed in BiSON data from one solar activity cycle (cycle 22) to
predict the mode frequencies that were observed in the next activity cycle
(cycle 23). Some bias in the predicted frequencies was observed when short 108d
time series were used to make the predictions. We also found that the accuracy
of the predictions was dependent on which activity proxy was used to make the
predictions and on the length of the relevant time series.


title: Current correlators and form factors in the resonance region

abstract:
  Within Resonance Chiral Theory and in the context of QCD current correlators
at next-to-leading order in 1/N(C), we have analyzed the two-body form factors
which include resonances as a final state . The short-distance constraints have
been studied. One of the main motivations is the estimation of the chiral
low-energy constants at subleading order, that is, keeping full control of the
renormalization scale dependence. As an application we show the resonance
estimation of some coupling, L(10)(mu_0)=(-4.4 \pm 0.9)10^{-3} and
C(87)(mu_0)=(3.1 \pm 1.1)10^{-5}.


title: Re-examination of Polytropic Spheres in Palatini f(R) Gravity

abstract:
  We investigate spherically symmetric, static matter configurations with
polytropic equation of state for a class of f(R) models in Palatini formalism
and show that the surface singularities recently reported in the literature are
not physical in the case of Planck scale modified lagrangians. In such cases,
they are just an artifact of the idealized equation of state used. In fact, we
show that for the models f(R)=R\pm\lambda R^2, with \lambda on the order of the
Planck length squared, the presence of a single electron in the Universe would
be enough to cure all stellar singularities of this type. From our analysis it
also follows that the stellar structure derived from these lagrangians is
virtually undistinguishable from that corresponding to General Relativity. For
ultraviolet corrected models far from the Planck scale, however, the surface
singularities may indeed arise in the region of validity of the polytropic
equation of state. This fact can be used to place constraints on the parameters
of particular models.


title: Diffeomorphism symmetry in quantum gravity models

abstract:
  We review and discuss the role of diffeomorphism symmetry in quantum gravity
models. Such models often involve a discretization of the space-time manifold
as a regularization method. Generically this leads to a breaking of the
symmetries to approximate ones, however there are incidences in which the
symmetries are exactly preserved. Both kind of symmetries have to be taken into
account in covariant and canonical theories in order to ensure the correct
continuum limit. We will sketch how to identify exact and approximate
symmetries in the action and how to define a corresponding canonical theory in
which such symmetries are reflected as exact and approximate constraints.


title:
Equation of state of zero-temperature quark matter with finite quark
  masses

abstract:
  We outline the key elements of a recent calculation aimed at determining the
equation of state of deconfined (but unpaired) quark matter at zero temperature
and high density, using finite quark masses. The computation is performed in
perturbation theory up to three loops, and necessitates the development and
application of some novel computational tools. In this talk, we introduce the
basic features of these new techniques and review the main sources of
motivation for considering finite quark mass effects in perturbation theory.


title: Seawater pH and Anthropogenic Carbon Dioxide

abstract:
  In 2005, the Royal Society published a report titled "Ocean acidification due
to increasing atmospheric carbon dioxide". The report's principal
conclusion-that average ocean pH could decrease by 0.5 units by 2100-is
demonstrated here to be consistent with a linear extrapolation of very limited
data. It is also shown that current understanding of ocean mixing, and of the
relationship between pH and atmospheric carbon dioxide concentration, cannot
justify such an extrapolation.


title:
Production and $\beta$ decay of rp-process nuclei $^{96}$Cd, $^{98}$In
  and $^{100}$Sn

abstract:
  The $\beta$-decay properties of the N=Z nuclei $^{96}$Cd, $^{98}$In and
$^{100}$Sn have been studied. These nuclei were produced at the National
Superconducting Cyclotron Laboratory (NSCL) by fragmenting a 120 MeV/nucleon
$^{112}$Sn primary beam on a Be target. The resulting radioactive beam was
filtered in the A1900 and the newly commissioned Radio Frequency Fragment
Separator (RFFS) to achieve a purity level suitable for decay studies. The
observed production cross sections of these nuclei are lower than predicted by
factors of 10 to 30. The $^{100}$Sn production cross section is 0.25(15) pb, in
sharp contrast with the 120 pb lower limit established at 63 MeV/nucleon
incident energy of the same primary beam. The deduced half-life of $^{100}$Sn
is 0.55$^{+0.70}_{-0.31}$ s, in agreement with previous measurements. Two
$\beta$-decaying states in $^{98}$In were observed with measured half-lives of
47(13) ms and 0.66(40) s. The half-life of $^{96}$Cd, which was the last
experimentally unknown waiting point half-life of the astrophysical rp-process,
is 1.03$^{+0.24}_{-0.21}$ s. The implications of the experimental T$_{1/2}$
value of $^{96}$Cd on the abundances predicted by rp-process calculations and
the origin of A=96 isobars such as $^{96}$Ru are explored.


title: Fourth Generation Leptons and Muon $g-2$

abstract:
  We consider the contributions to $g_\mu-2$ from fourth generation neutral and
charged leptons, $N$ and $E$, at the one-loop level. Diagramatically, there are
two types of contributions: boson-boson-$N$, and $E$-$E$-boson in the loop
diagram. In general, the effect from $N$ is suppressed by off-diagonal PMNS
matrix element $V_{N\mu}$, from the Standard Model to the Two-Higgs Doublet
Models. With contribution from $E$, we consider flavor changing neutral
couplings.


title: Matching of Resummed NLLA with Fixed NNLO for Event Shapes

abstract:
  We report work on the matching of the next-to-leading logarithmic
approximation (NLLA) onto the fixed next-to-next-to-leading order (NNLO)
calculation for event shape variables in electron-positron annihilation. The
correction of the combined NLLA+NNLO computation in the three-jet region,
relevant for precision phenomenology, is small compared with pure NNLO or
NLLA+NLO.


title: The Dark Energy Camera (DECam)

abstract:
  In this paper we describe the Dark Energy Camera (DECam), which will be the
primary instrument used in the Dark Energy Survey. DECam will be a 3 sq. deg.
mosaic camera mounted at the prime focus of the Blanco 4m telescope at the
Cerro-Tololo International Observatory (CTIO). It consists of a large mosaic
CCD focal plane, a five element optical corrector, five filters (g,r,i,z,Y), a
modern data acquisition and control system and the associated infrastructure
for operation in the prime focus cage. The focal plane includes of 62 2K x 4K
CCD modules (0.27"/pixel) arranged in a hexagon inscribed within the roughly
2.2 degree diameter field of view and 12 smaller 2K x 2K CCDs for guiding,
focus and alignment. The CCDs will be 250 micron thick fully-depleted CCDs that
have been developed at the Lawrence Berkeley National Laboratory (LBNL).
Production of the CCDs and fabrication of the optics, mechanical structure,
mechanisms, and control system for DECam are underway; delivery of the
instrument to CTIO is scheduled for 2010.


title:
Second-order critical lines of spin-S Ising models in a splitting field
  with Grassmann techniques

abstract:
  We propose a method to study the second-order critical lines of classical
spin-$S$ Ising models on two-dimensional lattices in a crystal or splitting
field, using an exact expression for the bare mass of the underlying field
theory. Introducing a set of anticommuting variables to represent the partition
function, we derive an exact and compact expression for the bare mass of the
model including all local multi-fermions interactions. By extension of the
Ising and Blume-Capel models, we extract the free energy singularities in the
low momentum limit corresponding to a vanishing bare mass. The loci of these
singularities define the critical lines depending on the spin S, in good
agreement with previous numerical estimations. This scheme appears to be
general enough to be applied in a variety of classical Hamiltonians.


title: Plasma torus dynamos versus laminar plasma dynamos

abstract:
  Earlier Wang et al [Phys Plasmas (2002)] have estimated a growth rate for the
magnetic field of ${\gamma}=0.055$ and flow ionization velocity of $51{km}/{s}$
in a laminar plasma slow dynamo mode for aspect ratio of
${r_{0}}/L\approx{0.6}$, where $r_{0}$ is the internal straight cylinder
radius, and L is the length scale of the plasma cylinder. In this paper, fast
dynamo modes in curved Riemannian heliotron are shown to be excited on a plasma
flow yielding a growth rate of ${\gamma}=0.318$ for an aspect ratio of
${r_{0}}/L\approx{0.16}$. It is interesting to note that the first growth rate
was obtained in the Wang et al slow dynamo, where the magnetic Reynolds number
of $Re_{m}=210$, while in the second one considered in this paper one uses the
limit of $Re_{m}\to{\infty}$. These growth rates ${\gamma}$ are computed by
applying the fast dynamo limit $lim_{{\eta}\to{0}}{\gamma}(\eta)>0$. This limit
is used in the self-induced equation, without the need to solve these equations
to investigate the fast dynamo action of the flow. In this sense the fast
dynamo seems to be excited by the elongation of the plasma device as suggested
by Wang group. The Frenet curvature of the tube is given by
${\kappa}_{0}\approx{0.5 m^{-1}}$. It is suggested that the small Perm torus
could be twisted [Dobler et al, Phys Rev E (2003)] in order to enhance even
more the fast dynamo effect. By considering the stability of the plasma torus
one obtains a value for the fast dynamo growth rate as high as ${\gamma}=1.712$
from a general expression ${\gamma}=0.16{\omega}$ and a toroidal oscillation of
a chaotic flow of ${\omega}=\frac{2{\pi}}{6}$.


title: Artin characters, Hurwitz trees and the lifting problem

abstract:
  We study finite groups of automorphisms of the $p$-adic open disk. In
particular, we generalize results of Green, Matignon and Henrio from cyclic
groups of order $p$ to arbitrary finite groups. As an application, we produce a
counterexample to a question of Chinburg, Guralnick and Harbater, concerning
the local lifting problem for generalized quaternion groups.


title:
Study of VV Scattering Processes as a Probe of Electroweak Symmetry
  Breaking

abstract:
  An exploratory study has been performed in order to assess the possibility of
probing the symmetry breaking mechanism through the $VV$ fusion process using
the CMS detector. A model independent analysis was carried out with no
assumption on the mechanism restoring the unitarity in the scattering amplitude
and without any degrees of freedom beyond the SM. In order to explore the
sensitivity of the analysis method to an heavy Higgs resonance, we analyzed a
data set produced using an Higgs boson mass of $500GeV$. Moreover, in order to
consider the $VV$ fusion cross section in a region where no resonances are
present, a sample corresponding to the no-Higgs scenario, that in the SM is
equivalent to a very high Higgs mass, has been also studied.


title: A Minimum Relative Entropy Principle for Learning and Acting

abstract:
  This paper proposes a method to construct an adaptive agent that is universal
with respect to a given class of experts, where each expert is an agent that
has been designed specifically for a particular environment. This adaptive
control problem is formalized as the problem of minimizing the relative entropy
of the adaptive agent from the expert that is most suitable for the unknown
environment. If the agent is a passive observer, then the optimal solution is
the well-known Bayesian predictor. However, if the agent is active, then its
past actions need to be treated as causal interventions on the I/O stream
rather than normal probability conditions. Here it is shown that the solution
to this new variational problem is given by a stochastic controller called the
Bayesian control rule, which implements adaptive behavior as a mixture of
experts. Furthermore, it is shown that under mild assumptions, the Bayesian
control rule converges to the control law of the most suitable expert.


title: SUSY Searches with Jets at CDF

abstract:
  We present the most recent results on searches for squarks and gluinos in
ppbar collisions at sqrt(s)=1.96 TeV, in events with large missing transverse
energy, leptons and multiple jets in the final state, based on 1.8 to 2.8 fb-1
of data collected by the CDF Run II detector at the Tevatron. No evidence of
new physics is found and exclusion limits in several MSSM scenarios are
extracted.


title: Leading twist distribution amplitudes of P-wave nonrelativistic mesons

abstract:
  This paper is devoted to the study of the leading twist distribution
amplitudes of P-wave nonrelativistic mesons. It is shown that at the leading
order approximation in relative velocity of quark-antiquark pair inside the
mesons these distribution amplitudes can be expressed through one universal
function. As an example, the distribution amplitudes of the P-wave charmonia
mesons are considered. Within QCD sum rules the model for the universal
function of P-wave charmonia mesons is built. In addition, it is found the
relations between the moments of the universal function and the nonrelativistic
QCD matrix elements that control relativistic corrections to any amplitude
involving P-wave charmonia. Our calculation shows that characteristic size of
these corrections is of order of ~30 %.


title: Phase boundaries in deterministic dense coding

abstract:
  We consider dense coding with partially entangled states on bipartite systems
of dimension $d\times d$, studying the conditions under which a given number of
messages, $N$, can be deterministically transmitted. It is known that the
largest Schmidt coefficient, $\lambda_0$, must obey the bound $\lambda_0\le
d/N$, and considerable empirical evidence points to the conclusion that there
exist states satisfying $\lambda_0=d/N$ for every $d$ and $N$ except the
special cases $N=d+1$ and $N=d^2-1$. We provide additional conditions under
which this bound cannot be reached -- that is, when it must be that
$\lambda_0<d/N$ -- yielding insight into the shapes of boundaries separating
entangled states that allow $N$ messages from those that allow only $N-1$. We
also show that these conclusions hold no matter what operations are used for
the encoding, and in so doing, identify circumstances under which unitary
encoding is strictly better than non-unitary.


title: Visual Physics Analysis (VISPA) - Concepts and First Applications

abstract:
  VISPA is a novel development environment for high energy physics analyses,
based on a combination of graphical and textual steering. The primary aim of
VISPA is to support physicists in prototyping, performing, and verifying a data
analysis of any complexity. We present example screenshots, and describe the
underlying software concepts.


title: Inclusive W and Z production with CMS at LHC startup

abstract:
  We report on potential for measurement of inclusive W and Z boson production
cross section using initial data from the LHC. We have designed W and Z
triggers, selection algorithms, and event reconstruction techniques for both
muon and electron decay modes, for low luminosity operation of the LHC
integrating up to about 10 pb-1. Initial calibrations and alignment accuracies
are assumed. While the accuracy of the cross section extracted will be
dominated by the integral luminosity measurement, ratios of W and Z production,
and asymmetry distributions will be important early measurements from LHC.


title: On non-holonomic systems and variational principles

abstract:
  We consider the compatibility of the equations of motion which follow from
d'Alembert's principle in the case of a general autonomous non-holonomic
mechanical system in N dimensions, with those equations which follow for the
same system by assuming the validity of a specific variational action
principle, in which the non-holonomic conditions are implemented by means of
the multiplication rule in the calculus of variations. The equations of motion
which follow from the principle of d'Alembert are not identical to the
equations which follow from the variational action principle. We give a proof
that the solutions to the equations of motion which follow from d'Alembert's
principle do not in general satisfy the equations which follow from the action
principle with non-holonomic constraints. Thus the principle of d'Alembert and
the minimal action principle involving the multiplication rule are not
compatible in the case of systems with non-holonomic constraints. For
simplicity the proof is given for autonomous systems only, with one general
non-holonomic constraint, which is linear in the generalized velocities of the
system.


title:
Inclusive Search for Squarks and Gluinos Production and Search for
  Sbottom from Gluino Decay at CDF

abstract:
  We present preliminary results on a search for squarks and gluinos in
proton-antiproton collisions with a center-of-mass energy of 1.96 TeV and based
on about 2.0 fb-1 of data collected by the CDF detector in the Tevatron Run II.
Events with multiple jets of hadrons and large missing transverse energy in the
final state are studied within the framework of minimal supergravity (mSUGRA)
and assuming R-parity conservation. The results are compared to Standard Model
predictions and limits on gluino and squark masses are extracted. A specific
search for the supersymmetric partner of the bottom quark produced from gluino
decays is carried out using a sample of events with missing transverse energy
and two or more jets, at least one of them b-tagged. Good agreement is found
between data and Standard Model predictions, and limits on gluino and sbottom
masses are extracted.


title: Wave propagation and shock formation in different magnetic structures

abstract:
  Velocity oscillations "measured" simultaneously at the photosphere and the
chromosphere -from time series of spectropolarimetric data in the 10830 A
region- of different solar magnetic features allow us to study the properties
of wave propagation as a function of the magnetic flux of the structure (i.e.
two different-sized sunspots, a tiny pore and a facular region). While
photospheric oscillations have similar characteristics everywhere, oscillations
measured at chromospheric heights show different amplitudes, frequencies and
stages of shock development depending on the observed magnetic feature. The
analysis of the power and the phase spectra, together with simple theoretical
modeling, lead to a series of results concerning wave propagation within the
range of heights of this study. We find that, while the atmospheric cut-off
frequency and the propagation properties of the different oscillating modes
depend on the magnetic feature, in all the cases the power that reaches the
high chromosphere above the atmospheric cut-off comes directly from the
photosphere by means of linear vertical wave propagation rather than from
non-linear interaction of modes.


title:
The Via Lactea INCITE Simulation: Galactic Dark Matter Substructure at
  High Resolution

abstract:
  It is a clear unique prediction of the cold dark matter paradigm of
cosmological structure formation that galaxies form hierarchically and are
embedded in massive, extended dark halos teeming with self-bound substructure
or "subhalos". The amount and spatial distribution of subhalos around their
host provide unique information and clues on the galaxy assembly process and
the nature of the dark matter. Here we present results from the Via Lactea
INCITE simulation, a one billion particle, one million cpu-hour simulation of
the formation and evolution of a Galactic dark matter halo and its substructure
population.


title:
Exact results for the Wigner transform phase space densities of a
  two-dimensional harmonically confined charged quantum gas subjected to a
  magnetic field

abstract:
  Closed form analytical expressions are obtained for the Wigner transform of
the Bloch density matrix and for the Wigner phase space density of a two
dimensional harmonically trapped charged quantum gas in a uniform magnetic
field of arbitrary strength, at zero and nonzero temperatures. An exact
analytic expression is also obtained for the autocorrelation function. The
strong magnetic field case, where only few Landau levels are occupied, is also
examined, and useful approximate expressions for the spatial and momentum
densities are given.


title: Maximally-localized Wannier functions for GW quasiparticles

abstract:
  We review the formalisms of the self-consistent GW approximation to many-body
perturbation theory and of the generation of optimally-localized Wannier
functions from groups of energy bands. We show that the quasiparticle Bloch
wave functions from such GW calculations can be used within this Wannier
framework. These Wannier functions can be used to interpolate the many-body
band structure from the coarse mesh of Brillouin zone points on which it is
known from the initial calculation to the usual symmetry lines, and we
demonstrate that this procedure is accurate and efficient for the
self-consistent GW band structure. The resemblance of these Wannier functions
to the bond orbitals discussed in the chemical community led us to expect
differences between density-functional and many-body functions that could be
qualitatively interpreted. However, the differences proved to be minimal in the
cases studied. Detailed results are presented for SrTiO_3 and solid argon.


title: Recent results on angular momentum and strangeness in the nucleon

abstract:
  HERMES has measured azimuthal single-spin asymmetries of pions and charged
kaons produced in deep-inelastic scattering of electrons and positrons off a
transversely polarized hydrogen target. These asymmetries provide information
about the Collins and Sivers mechanisms, which are signals for the transverse
parton distribution function h_1^q in convolution with the Collins
fragmentation function H_1^{\perp,q}, and of the Sivers distribution function
f_{1T}^{\perp,q} with the spin-averaged fragmentation function D_q^h,
respectively. Furthermore, both the momentum and helicity distributions of the
strange quark sea have been extracted in leading order from the multiplicity
and the inclusive double spin asymmetry, respectively, in the production of
charged kaons when scattering polarized positrons off a longitudinally
polarized deuterium target. The shape of the momentum distribution is softer
than that of the average of the \bar{u} and \bar{d} quarks. The helicity
distribution is found to be consistent with zero.


title: Prospects for observing CP violation and rare decays at ATLAS and CMS

abstract:
  Model (BSM). ATLAS and CMS concentrate on B decays that can be registered by
a di-muon signature. B-hadrons decaying to J/psi(mumu) will statistically
dominate B-physics analyses allowing high precision measurements, in particular
a test of BSM effects in the CP violation of Bs-Jpsiphi. In the so-called rare
B-decay sector, ATLAS and CMS will concentrate on a family of semi-muonic
exclusive channels, b - s mumu and on the purely muonic decay Bs - mumu. After
three years of LHC running at a luminosity of a few times 1033 cm-2 s-1
(corresponding to 30 fb-1), each of these two experiments can measure the
Bs-mumu signal with 3 sigma significance, assuming the Standard Model (SM)
value for the decay probability.


title: On regularization methods of EM-Kaczmarz type

abstract:
  We consider regularization methods of Kaczmarz type in connection with the
expectation-maximization (EM) algorithm for solving ill-posed equations. For
noisy data, our methods are stabilized extensions of the well established
ordered-subsets expectation-maximization iteration (OS-EM). We show
monotonicity properties of the methods and present a numerical experiment which
indicates that the extended OS-EM methods we propose are much faster than the
standard EM algorithm.


title: New Methods for the Calculation of Multi-Loop Amplitudes

abstract:
  We present a brief review of current methods for the calculation of
multi-loop amplitudes including recent developments. As an example we present
the calculation of the second moment of the heavy quark current correlator and
the extraction of the values of the charm and bottom quark masses using the
results of this calculation.


title: Tristability in the pendula chain

abstract:
  Experiments on a chain of coupled pendula driven periodically at one end
demonstrate the existence of a novel regime which produces an output frequency
at an odd fraction of the driving frequency. The new stationary state is then
obtained on numerical simulations and modeled with an analytical solution of
the continuous sine-Gordon equation that resembles a kink-like motion back and
forth in the restricted geometry of the chain. This solution differs from the
expressions used to understand nonlinear bistability where the synchronization
constraint was the basic assumption. As a result the short pendula chain is
shown to possess tristable stationary states and to act as a frequency divider.

categories: nlin.PS cond-mat.stat-mech nlin.SI physics.class-ph


title: Vector meson production at HERA

abstract:
  The rich experimental landscape of exclusive vector meson production at the
high energy electron-proton collider HERA is reviewed, with emphasis on the
transition from soft to hard diffraction and QCD interpretations.


title: Statistical analysis of a subset of the string theory landscape

abstract:
  An analysis of a special class of type II string theory compactifications is
presented. We focus on recent work in one particular orientifold background of
intersecting brane models and the resulting four dimensional gauge group and
matter content. Special attention is paid to solutions that resemble the gauge
group of the MSSM. Statistical correlations between properties of the models
are analysed and compared to results on different backgrounds.


title: Heavy-light meson's physics in Lattice QCD

abstract:
  The possibility of revealing new physics by studying the flavor sector of the
Standard Model strongly depends upon the accuracy that will be achieved in
(near) future lattice QCD calculations and, in particular, on heavy-light
meson's observables. In turn, handling with heavy-light mesons on the lattice
is a challenging problem, because of the presence of two largely separated
energy scales, and at present it is impossible to extract matrix elements
involving B mesons in external states without recurring to some approximation.
In this note I give a fast overview of some of the methods that have been
devised to handle such kind of problems, emphasizing those based on finite
volume techniques, and briefly discuss some recent results obtained by their
application.


title: GUT Inflation and Proton Decay after WMAP5

abstract:
  We employ Coleman-Weinberg and Higgs potentials to implement inflation in
non-supersymmetric grand unified theories (GUTs) such as SU(5) and SO(10). To
realize a scalar spectral index close to 0.96, as indicated by the most recent
WMAP 5-year anlaysis, the energy scale of observable inflation turns out to be
of order $10^{16}$ GeV. This implies a GUT symmetry breaking scale of similar
magnitude, and proton lifetime of order $10^{34}$-$10^{38}$ years. In some
SO(10) models with axion dark matter, the scalar leptoquark boson exchange
leads to proton decay with a lifetime of order $10^{34}$-$10^{35}$ years.


title:
Experimental Study of Application Specific Source Coding for Wireless
  Sensor Networks

abstract:
  The energy bottleneck in Wireless Sensor Network(WSN) can be reduced by
limiting communication overhead. Application specific source coding schemes for
the sensor networks provide fewer bits to represent the same amount of
information exploiting the redundancy present in the source model, network
architecture and the physical process. This paper reports the performance of
representative codes from various families of source coding schemes (lossless,
lossy, constant bit-rate, variable bit-rate, distributed and joint
encoding/decoding) in terms of energy consumed, bit-rate achieved,
quantization-error/reconstruction-error, latency and complexity of
encoder-decoder(codec). A reusable frame work for testing source codes is
provided. Finally we propose a set of possible applications and suitable source
codes in terms of these parameters.


title: Neutrino Oscillation Studies with MINOS

abstract:
  The MINOS experiment observes the NuMI beam produced by the Main Injector
accelerator at two detector stations, one 1 km and the other 735 km from the
neutrino production target. From the disappearance of neutrinos in flight
between the two detectors, we measure the neutrino oscillation parameters
$\Delta m_{23}^2$ and $\sin^2(2\theta_{23})$ and update our previously
published result. Additionally, we have searched for evidence of additional
light neutrino families which do not couple to the weak interaction. Finally,
we discuss the status of our search for the appearance of $\nu_{e}$, an effect
expected if the mixing angle $\theta_{13}$ is non-zero and required if the goal
of CP violation in the neutrino sector is to be observed.


title: Integrable models from PT-symmetric deformations

abstract:
  We address the question of whether integrable models allow for PT-symmetric
deformations which preserve their intgrability. For this purpose we carry out
the Painleve test for PT-symmetric deformations of Burgers and the Korteweg-De
Vries equation. We find that the former equation allows for infinitely many
deformations which pass the Painleve test. For a specific deformation we prove
the convergence of the Painleve expansion and thus establish the Painleve
property for these models, which are therefore thought to be integrable. The
Korteweg-De Vries equation does not allow for deformations which pass the
Painleve test in complete generality, but we are able to construct a defective
Painleve expansion.


title: A Quantum Canonical Embedding

abstract:
  This paper presents an English version of a chapter of the L.L. Vaksman book
`Quantum Bounded Symmetric Domains', see arXiv:0803.3769 [math.QA]. This
chapter deals with a quantum analog of a canonical embedding of a bounded
symmetric domain.


title:
Cocycle and orbit superrigidity for lattices in SL(n,R) acting on
  homogeneous spaces

abstract:
  We prove cocycle and orbit equivalence superrigidity for lattices in SL(n,R)
acting linearly on R^n, as well as acting projectively on certain flag
manifolds, including the real projective space. The proof combines operator
algebraic techniques with the property (T) in the sense of Zimmer for the
action of SL(n,Z) on R^n, n \geq 4. We also show that the restriction of the
associated orbit equivalence relation to a subset of finite Lebesgue measure,
provides a II_1 equivalence relation with property (T) and yet fundamental
group equal to R_+.


title:
Approximating the Gaussian Multiple Description Rate Region Under
  Symmetric Distortion Constraints

abstract:
  We consider multiple description coding for the Gaussian source with K
descriptions under the symmetric mean squared error distortion constraints, and
provide an approximate characterization of the rate region. We show that the
rate region can be sandwiched between two polytopes, between which the gap can
be upper bounded by constants dependent on the number of descriptions, but
independent of the exact distortion constraints. Underlying this result is an
exact characterization of the lossless multi-level diversity source coding
problem: a lossless counterpart of the MD problem. This connection provides a
polytopic template for the inner and outer bounds to the rate region. In order
to establish the outer bound, we generalize Ozarow's technique to introduce a
strategic expansion of the original probability space by more than one random
variables. For the symmetric rate case with any number of descriptions, we show
that the gap between the upper bound and the lower bound for the individual
description rate is no larger than 0.92 bit. The results developed in this work
also suggest the "separation" approach of combining successive refinement
quantization and lossless multi-level diversity coding is a competitive one,
since it is only a constant away from the optimum. The results are further
extended to general sources under the mean squared error distortion measure,
where a similar but looser bound on the gap holds.


title: SUSY Searches in Multi-lepton and Di-photon Final States at D0

abstract:
  We report results from searches for supersymmetry with trileptons plus
missing transverse energy and diphotons plus missing transverse energy made
using the D0 detector at the Fermilab Tevatron collider. These searches are
optimized for MSSM SUSY and GMSB, respectively. New limits are set on the
considered SUSY models. This article is the proceedings for a parallel talk
given at ICHEP08.


title: Charged-Higgs effects in B --> (D) tau nu decays

abstract:
  We update and compare the capabilities of the purely leptonic mode B --> tau
nu and the semileptonic mode B --> D tau nu in the search for a charged Higgs
boson.


title: Singular McKay correspondence for normal surfaces

abstract:
  We define the singular orbifold elliptic genus and $E$-function for all
normal surfaces without strictly log-canonical singularities, and prove the
analogue of the McKay correspondence in this setting. Our invariants generalize
the stringy invariants defined by Willem Veys for this class of singularities.
We show that the ability to define these invariants is closely linked to
rigidity phenomena associated to the elliptic genus.


title: Nonstandard, strongly interacting spin one $t \bar t$ resonances

abstract:
  Examining theories with an extended strong interaction sector such as
axigluons or flavour universal colorons, we find that the constraints obtained
from the current data on $t \bar t$ production at the Tevatron are in the range
of $\sim {\cal O}$ TeV and thus competitive with those obtained from the dijet
data. We point out that for large axigluon/coloron masses, the limits on the
coloron mass may be different than those for the axigluon even for $\cot \xi =
1$. We also compute the expected forward-backward asymmetry for the case of the
axigluons which would allow it to be discriminated against the SM as also the
colorons. We further find that at the LHC, the signal should be visible in the
$t \bar t$ invariant mass spectrum for a wide range of axigluon and coloron
masses that are still allowed. We point out how top polarisation may be used to
further discriminate the axigluon and coloron case from the SM as well as from
each other.


title:
Three-point susceptibilities $\chi_n(k;t)$ and $\chi_n^s(k;t)$:
  mode-coupling approximation

abstract:
  Recently, it was argued that a three-point susceptibility equal to the
density derivative of the intermediate scattering function, $\chi_n(k;t) = d
F(k;t)/d n$, enters into an expression for the divergent part of an integrated
four-point dynamic density correlation function of a colloidal suspension
[Berthier \textit{et al.}, J. Chem. Phys. \textbf{126}, 184503 (2007)]. We show
that, within the mode-coupling theory, the equation of motion for $\chi_n(k;t)$
is essentially identical as the equation of motion for the $\mathbf{q}\to 0$
limit of the three-point susceptibility $\chi_{\mathbf{q}}(\mathbf{k};t)$
introduced by Biroli \textit{et al.} [Phys. Rev. Lett. \textbf{97}, 195701
(2006)]. We present a numerical solution of the equation of motion for
$\chi_n(k;t)$. We also derive and numerically solve an equation of motion for
the density derivative of the self-intermediate scattering function,
$\chi_n^s(k;t) = d F^s(k;t)/d n$. We contrast the wave vector dependence of
$\chi_n(k;t)$ and $\chi_n^s(k;t)$.


title:
Intermediate phase, network demixing, boson and floppy modes, and
  compositional trends in glass transition temperatures of binary AsxS1-x
  system

abstract:
  The structure of binary As_xS_{1-x} glasses is elucidated using
modulated-DSC, Raman scattering, IR reflectance and molar volume experiments
over a wide range (8%<x<41%) of compositions. We observe a reversibility window
in the calorimetric experiments, which permits fixing the three elastic phases;
flexible at x<22.5%, intermediate phase (IP) in the 22.5%<x<29.5% range, and
stressed-rigid at x>29.5%. Raman scattering supported by first principles
cluster calculations reveal existence of both pyramidal (PYR, As(S1/2)3) and
quasi-tetrahedral(QT, S=As(S1/2)3) local structures. The QT unit concentrations
show a global maximum in the IP, while the concentration of PYR units becomes
comparable to those of QT units in the phase, suggesting that both these local
structures contribute to the width of the IP. The IP centroid in the sulfides
is significantly shifted to lower As content x than in corresponding selenides,
a feature identified with excess chalcogen partially segregating from the
backbone in the sulfides, but forming part of the backbone in selenides. These
ideas are corroborated by the proportionately larger free volumes of sulfides
than selenides, and the absence of chemical bond strength scaling of Tgs
between As-sulfides and As-selenides. Low-frequency Raman modes increase in
scattering strength linearly as As content x of glasses decreases from x = 20%
to 8%, with a slope that is close to the floppy mode fraction in flexible
glasses predicted by rigidity theory. These results show that floppy modes
contribute to the excess vibrations observed at low frequency. In the
intermediate and stressed rigid elastic phases low-frequency Raman modes
persist and are identified as boson modes. Some consequences of the present
findings on the optoelectronic properties of these glasses is commented upon.


title: Cluster expansion formulas and perfect matchings

abstract:
  We study cluster algebras with principal coefficient systems that are
associated to unpunctured surfaces. We give a direct formula for the Laurent
polynomial expansion of cluster variables in these cluster algebras in terms of
perfect matchings of a certain graph $G_{T,\gamma}$ that is constructed from
the surface by recursive glueing of elementary pieces that we call tiles. We
also give a second formula for these Laurent polynomial expansions in terms of
subgraphs of the graph $G_{T,\gamma}$.


title: GRB observations with HESS

abstract:
  H.E.S.S. (High Energy Stereoscopic System), which is designed to detect TeV
gamma-rays, is a system of four Imaging Atmospheric Cherenkov Telescopes
situated in Namibia. The system has been shown to be very successful in
detecting and observing galactic and extra-galactic TeV sources. In order to
explore the highest energy end of GRB spectra, a GRB observing program has been
established in the H.E.S.S. collaboration. Here we introduce our GRB observing
program and report on its current status.


title: Appearance of Gauge Fields and Forces beyond the adiabatic approximation

abstract:
  We investigate the origin of quantum geometric phases, gauge fields and
forces beyond the adiabatic regime. In particular, we extend the notions of
geometric magnetic and electric forces discovered in studies of the
Born-Oppenheimer approximation to arbitrary quantum systems described by matrix
valued quantum Hamiltonians. The results are illustrated by several physical
relevant examples.


title: Rational Hadamard products via Quantum Diagonal Operators

abstract:
  We use the remark that, through Bargmann-Fock representation, diagonal
operators of the Heisenberg-Weyl algebra are scalars for the Hadamard product
to give some properties (like the stability of periodic fonctions) of the
Hadamard product by a rational fraction. In particular, we provide through this
way explicit formulas for the multiplication table of the Hadamard product in
the algebra of rational functions in $\C[[z]]$.


title:
Measurement of Inclusive Jet Cross Sections in Z(->ee)+jets Production
  in ppbar Collisions at sqrt{s} = 1.96 TeV

abstract:
  Inclusive jet cross sections in Z/\gamma^* events, with Z/\gamma^* decaying
into an electron-positron pair, are measured as a function of jet transverse
momentum and jet multiplicity in ppbar collisions at sqrt{s} = 1.96 TeV with
the upgraded Collider Detector at Fermilab in Run II, based on an integrated
luminosity of 2.5 fb-1. The measurements cover the rapidity region |yjet | <
2.1 and the transverse momentum range ptjet > 30 GeV/c. Next-to-leading order
perturbative QCD predictions are in good agreement with the measured cross
sections.


title: NC Coherent pi0 Production Below 2 GeV

abstract:
  The single largest background to future $\bar{\nu_{\mu}}\to \bar{\nu_e}$
($\nu_\mu \to \nu_e$) oscillation searches is neutral current (NC) $\pi^0$
production. MiniBooNE, which began taking antineutrino data in January 2006,
has the world's largest sample of reconstructed $\pi^0$'s produced by
antineutrinos. These neutral pions are primarily produced through the $\Delta$
resonance but can also be created through "coherent production." The latter
process is the coherent sum of glancing scatters of antineutrinos off a neutron
or proton, in which the nucleus is kept intact but a $\pi^0$ is created. A
signature of this process is a $\pi^0$ which is highly forward-going. It is
useful to study coherent production using antineutrinos rather than neutrinos
because the ratio of coherent to resonant scattering is enhanced in
antineutrino running. The measurement of NC coherent $\pi^0$ production in the
MiniBooNE antineutrino data will be discussed.


title: How Do Galaxies Form?

abstract:
  It is currently believed that galaxies were assembled via chaotic
hierarchical mergers between massive cold dark matter halos, in which baryonic
star forming matter was embedded. One would therefore expect the properties of
individual galaxies to be determined by numerous independent factors such as
star forming history, merger history, mass, angular momentum, size and
environment. It is therefore surprising to find that galaxies actually appear
to form an (almost) one parameter family in which galaxy mass is the dominant
factor.


title: Hadronic Charm Decays: An Experimental Review

abstract:
  I review some recent results on hadronic decays of charmed mesons. These
decays illuminate a wide range of physics, including the absolute
normalizations of b and c decays, the understanding of D^0 mixing, the coupling
of heavy mesons to hadronic decay products, and light hadron spectroscopy.


title: W and Z Boson Production at the ATLAS Experiment

abstract:
  The LHC experiments are close to collecting data and one of their first tasks
is to test the electro-weak sector of the Standard Model. In this talk an
overview of first physics measurements with events containing W and Z bosons is
presented, such as the W and Z production cross-sections. Emphasis will be
given to data-driven approaches used to extract trigger and lepton
reconstruction efficiencies and to reject backgrounds.


title: Exact quantum lower bound for Grover's problem

abstract:
  One of the most important quantum algorithms ever discovered is Grover's
algorithm for searching an unordered set. We give a new lower bound in the
query model which proves that Grover's algorithm is exactly optimal. Similar to
existing methods for proving lower bounds, we bound the amount of information
we can gain from a single oracle query, but we bound this information in terms
of angles. This allows our proof to be simple, self-contained, based on only
elementary mathematics, capturing our intuition, while obtaining at the same an
exact bound.


title: Chemical Inhomogeneities in the Milky Way Stellar Halo

abstract:
  We have compiled a sample of 699 stars from the recent literature with
detailed chemical abundance information (spanning -4.2 < [Fe/H] < +0.3), and we
compute their space velocities and Galactic orbital parameters. We identify
members of the inner and outer stellar halo populations in our sample based
only on their kinematic properties and then compare the abundance ratios of
these populations as a function of [Fe/H]. In the metallicity range where the
two populations overlap (-2.5 < [Fe/H] < -1.5), the mean [Mg/Fe] of the outer
halo is lower than the inner halo by ~0.1 dex. For [Ni/Fe] and [Ba/Fe], the
star-to-star abundance scatter of the inner halo is consistently smaller than
in the outer halo. The [Na/Fe], [Y/Fe], [Ca/Fe], and [Ti/Fe] ratios of both
populations show similar means and levels of scatter. Our inner halo population
is chemically homogeneous, suggesting that a significant fraction of the Milky
Way stellar halo originated from a well-mixed ISM. In contrast, our outer halo
population is chemically diverse, suggesting that another significant fraction
of the Milky Way stellar halo formed in remote regions where chemical
enrichment was dominated by local supernova events. We find no abundance trends
with maximum radial distance from the Galactic center or maximum vertical
distance from the Galactic disk. We also find no common kinematic signature for
groups of metal-poor stars with peculiar abundance patters, such as the
alpha-poor stars or stars showing unique neutron-capture enrichment patterns.
Several stars and dSph systems with unique abundance patterns spend the
majority of their time in the distant regions of the Milky Way stellar halo,
suggesting that the true outer halo of the Galaxy may have little resemblance
to the local stellar halo.


title: The CMBR ISW and HI 21-cm Cross-correlation Angular Power Spectrum

abstract:
  The late-time growth of large scale structures (LSS) is imprinted in the CMBR
anisotropy through the Integrated Sachs Wolfe (ISW) effect. This is perceived
to be a very important observational probe of dark energy. Future observations
of redshifted 21-cm radiation from the cosmological neutral hydrogen (HI)
distribution hold the potential of probing the LSS over a large redshift range.
We have investigated the possibility of detecting the ISW through
cross-correlations between the CMBR anisotropies and redshifted 21-cm
observations. Assuming that the HI traces the dark matter, we find that the
ISW-HI cross-correlation angular power spectrum at an angular multipole l is
proportional to the dark matter power spectrum evaluated at the comoving wave
number l/r, where r is the comoving distance to the redshift from which the HI
signal originated. The amplitude of the cross-correlation signal depends on
parameters related to the HI distribution and the growth of cosmological
perturbations. However the cross-correlation is extremely weak as compared to
the CMBR anisotropies and the predicted HI signal. As a consequence the
cross-correlation signal is smaller than the cosmic variance, and a
statistically significant detection is not very likely.


title: The Clustering and Host Halos of Galaxy Mergers at High Redshift

abstract:
  High-resolution simulations of cosmological structure formation indicate that
dark matter substructure in dense environments, like groups and clusters, may
survive for a long time. These dark matter subhalos are the likely hosts of
galaxies. We examine the small-scale spatial clustering of subhalo major
mergers at high redshift using high-resolution N-body simulations of
cosmological volumes. Recently merged, massive subhalos exhibit enhanced
clustering on scales ~100-300 kpc/h, relative to all subhalos of the same
infall mass, for a short time after a major merger (< 500 Myr). The small-scale
clustering enhancement is smaller for lower mass subhalos, which also show a
deficit on scales just beyond the excess. Halos hosting recent subhalo mergers
tend to have more subhalos; for massive subhalos the excess is stronger and it
tends to increase for the most massive host halos. The subhalo merger fraction
is independent of halo mass for the scales we probe. In terms of satellite and
central subhalos, the merger increase in small-scale clustering for massive
subhalos arises from recently merged massive central subhalos having an
enhanced satellite population. Our mergers are defined via their parent infall
mass ratios. Subhalos experiencing major mass gains also exhibit a small-scale
clustering enhancement, but these correspond to two-body interactions leading
to two final subhalos, rather than subhalo coalescence.


title:
Old-Population Hypervelocity Stars from the Galactic Center: Limits from
  the SDSS

abstract:
  We present limits on the ejection of old-population HVS from a sample of over
290,000 stars selected from the SDSS. We derive the speed at the solar circle
from the measured positions and radial velocities by assuming a radial orbit
and adopting a simple isothermal model of the Galactic halo, which enables us
to identify candidate bound and unbound ejectees. We find 4 candidate bound
F-stars from this sample, all with negative Galactocentric radial velocity
(i.e., returning toward the GC). We additionally find 2 candidate unbound stars
(one F and one G), however, existing proper motion measurements make these
unlikely to be emerging from the GC. These data place an upper limit on the
rate of ejection of old-population stars from the GC of ~45/Myr. Comparing to
the rate for more massive B-star ejectees of ~0.5/Myr, our limit on the rate of
ejection of old-population HVS shows that the mass function at the GC is not
bottom-heavy and is consistent with being normal. Future targeted surveys of
old-population HVS could determine if it is indeed top-heavy.


title: Top Quark Physics

abstract:
  A review is presented of the current experimental status of the top quark
sector of the standard model. The measurements summarized include searches for
electroweak single top production, the latest results on the ttbar production
cross section, and searches for new physics in top quark production and decay.
In addition, the recent measurement of the top quark mass to a precision of
0.7% is highlighted


title:
Ongoing and co-evolving star formation in zCOSMOS galaxies hosting
  Active Galactic Nuclei

abstract:
  We present a study of the host galaxies of AGN selected from the zCOSMOS
survey to establish if accretion onto supermassive black holes and star
formation are explicitly linked up to z~1. We identify 152 galaxies that harbor
AGN, based on XMM observations of 7543 galaxies (i<22.5). Star formation rates
(SFRs), including those weighted by stellar mass, are determined using the
[OII]3727 emission-line, corrected for an AGN contribution. We find that the
majority of AGN hosts have significant levels of star formation with a
distribution spanning ~1-100 Msun yr^-1. The close association between AGN
activity and star formation is further substantiated by an increase in the AGN
fraction with the youthfulness of their stars as indicated by the rest-frame
color (U-V) and spectral index Dn(4000); we demonstrate that mass-selection
alleviates an artifical peak falling in the transition region when using
luminosity-limited samples. We also find that the SFRs of AGN hosts evolve with
cosmic time in a manner that closely mirrors the overall galaxy population and
explains the low SFRs in AGNs (z<0.3) from the SDSS. We conclude that the
conditions most conducive for AGN activity are a massive host galaxy and a
large reservoir of gas. Furthermore, a direct correlation between mass
accretion rate onto SMBHs and SFR is shown to be weak although the average
ratio is constant with redshift, effectively shifting the evidence for a
co-evolution scenario in a statistical manner to smaller physical scales. Our
findings illustrate an intermittent scenario with an AGN lifetime substantially
shorter than that of star formation and underlying complexities regarding
fueling over vastly different physical scales yet to be determined [Abridged].


title: Tunnelling for Large N

abstract:
  In this brief note, by applying the stochastic approach to multiple fields,
we estimate the probability of tunneling between vacua in a landscape with
$\cal N$ fields. We find that the probability can be enhanced by large $\cal
N$. When $\cal N$ saturates the dS entropy of some vacuum, the corresponding
vacuum will be extremely unstable and be expected to rapidly decay. We discuss
the implications of this result.


title: Alas, the dark matter structures were not that trivial

abstract:
  The radial density profile of dark matter structures has been observed to
have an almost universal behaviour in numerical simulations, however, the
physical reason for this behaviour remains unclear. It has previously been
shown that if the pseudo phase-space density, rho/sigma_d^epsilon, is a
beautifully simple power-law in radius, with the "golden values" epsilon=3 and
d=r (i.e., the phase-space density is only dependent on the radial component of
the velocity dispersion), then one can analytically derive the radial variation
of the mass profile, dispersion profile etc. That would imply, if correct, that
we just have to explain why rho/sigma^3_r ~r^{-alpha}, and then we would
understand everything about equilibrated DM structures. Here we use a set of
simulated galaxies and clusters of galaxies to demonstrate that there are no
such golden values, but that each structure instead has its own set of values.
Considering the same structure at different redshifts shows no evolution of the
phase-space parameters towards fixed points. There is also no clear connection
between the halo virialized mass and these parameters. This implies that we
still do not understand the origin of the profiles of dark matter structures.


title:
Reconstruction and Identification of Hadronic Decays of Taus using the
  CMS Detector

abstract:
  New physics beyond the Standard Model could well preferentially show up at
the LHC in final states with taus. The development of efficient and accurate
reconstruction and identification of taus is therefore an important item in the
CMS physics programme. The potentially superior performance of a particle-flow
approach can help to achieve this goal with the CMS detector. Preliminary
strategies are presented in this summary for the hadronic decays of the taus.


title: Relativistic magnetotransport in graphene

abstract:
  We study the thermal and electric transport of a fluid of interacting Dirac
fermions as they arise in single-layer graphene. We include Coulomb
interactions, a dilute density of charged impurities and the presence of a
magnetic field to describe both the static and the low frequency response as a
function of temperature T and chemical potential mu. In the critical regime mu
<< T where both bands above and below the Dirac point contribute to transport
we find pronounced deviations from Fermi liquid behavior, universal,
collision-dominated values for transport coefficients and a cyclotron resonance
of collective nature. In the collision-dominated high temperature regime the
linear thermoelectric transport coefficients are shown to obey the constraints
of relativistic magnetohydrodynamics which we derive microscopically from
Boltzmann theory. The latter also allows us to describe the crossover to
disorder-dominated Fermi liquid behavior at large doping and low temperatures,
as well as the crossover to the ballistic regime at high fields.


title:
Cosmic flow from 2MASS redshift survey: The origin of CMB dipole and
  implications for LCDM cosmology

abstract:
  We generate the peculiar velocity field for the 2MASS Redshift Survey (2MRS)
catalog using an orbit-reconstruction algorithm. The reconstructed velocities
of individual objects in 2MRS are well-correlated with the peculiar velocities
obtained from high-precision observed distances within 3,000 km/s. We estimate
the mean matter density to be 0.31 +/- 0.05 by comparing observed to
reconstructed velocities in this volume. The reconstructed motion of the Local
Group in the rest frame established by distances within 3,000 km/s agrees with
the observed motion and is generated by fluctuations within this volume, in
agreement with observations. Then, we reconstruct the velocity field of 2MRS in
successively larger radii, to study the problem of convergence towards the CMB
dipole. We find that less than half of the amplitude of the CMB dipole is
generated within a volume enclosing the Hydra-Centaurus-Norma supercluster at
around 40 Mpc/h. Although most of the amplitude of the CMB dipole seems to be
recovered by 120 Mpc/h, the direction does not agree and hence we observe no
convergence up to this scale.
  We develop a statistical model which allows us to estimate cosmological para
meters from the reconstructed growth of convergence of the velocity of the
Local Group towards the CMB dipole motion. For scales up to 60 Mpc/h, assuming
a Local Group velocity of 627 km/s, we estimate Omega_m h^2 = 0.11 +/- 0.06 and
sigma_8=0.9 +/- 0.4, in agreement with WMAP5 measurements at the 1-sigma level.
However, for scales up to 100 Mpc/h, we obtain Omega_m h^2 = 0.08 +/- 0.03 and
sigma_8=1.0 +/- 0.4, which agrees at the 1 to 2-sigma level with WMAP5 results.
(abridged)


title:
Probing the neutral edge modes in transport across a point contact via
  thermal effects in the Read-Rezayi non-abelian quantum Hall states

abstract:
  Non-abelian quantum Hall states are characterized by the simultaneous
appearance of charge and neutral gapless edge modes, with the structure of the
latter being intricately related to the existence of bulk quasi-particle
excitations obeying non-abelian statistics. In general, it is hard to probe the
neutral modes in charge transport measurements and a thermal transport
measurement seems to be inevitable. Here we propose a setup which can get
around this problem by having two point contacts in series separated by a
distance set by the thermal equilibration length of the charge mode. We show
that by using the first point contact as a heating device, the excess charge
noise measured at the second point contact carries a non-trivial signature of
the presence of the neutral mode hence leading to its indirect detection. We
also obtain explicit expressions for the thermal conductance and corresponding
Lorentz number for transport across a quantum point contact between two edges
held at different temperatures and chemical potentials.


title:
Globular Cluster Systems in Nearby Dwarf Galaxies: I. HST/ACS
  Observations and Dynamical Properties of Globular Clusters at Low
  Environmental Density

abstract:
  We investigate the old globular cluster (GC) population of 68 faint (Mv>-16
mag) dwarf galaxies located in the halo regions of nearby (<12 Mpc) loose
galaxy groups and in the field environment based on archival HST/ACS images in
F606W and F814W filters. The combined color distribution of 175 GC candidates
peaks at (V-I)=0.96 +/- 0.07 mag and the GC luminosity function turnover for
the entire sample is found at Mv,to = -7.6 +/- 0.11 mag, similar to the old
metal-poor LMC GC population. Our data reveal a tentative trend of Mv,to
becoming fainter from late-type to early-type galaxies. The luminosity and
color distributions of GCs in dIrrs shows a lack of faint blue GCs. Our
analysis reveals that this might reflect a relatively younger GC system than
typically found in luminous early-type galaxies. If verified by spectroscopy
this would suggest a later formation epoch of the first metal-poor star
clusters in dwarf galaxies. We find several bright (massive) GCs which reside
in the nuclear regions of their host galaxies. These nuclear clusters have
similar luminosities and structural parameters as the peculiar Galactic
clusters suspected of being the remnant nuclei of accreted dwarf galaxies, such
as M54 and wCen. Except for these nuclear clusters, the distribution of GCs in
dIrrs in the half-light radius vs. cluster mass plane is very similar to that
of Galactic young halo clusters, which suggests comparable formation and
dynamical evolution histories. A comparison with theoretical models of cluster
disruption indicates that GCs in low-mass galaxies evolve dynamically as
self-gravitating systems in a benign tidal environment.


title:
Gas-dynamic shock heating of post-flare loops due to retraction
  following localized, impulsive reconnection

abstract:
  We present a novel model in which shortening of a magnetic flux tube
following localized, three-dimensional reconnection generates strong
gas-dynamic shocks around its apex. The shortening releases magnetic energy by
progressing away from the reconnection site at the Alfven speed. This launches
inward flows along the field lines whose collision creates a pair of
gas-dynamic shocks. The shocks raise both the mass density and temperature
inside the newly shortened flux tube. Reconnecting field lines whose initial
directions differ by more that 100 degrees can produce a concentrated knot of
plasma hotter that 20 MK, consistent with observations. In spite of these high
temperatures, the shocks convert less than 10% of the liberated magnetic energy
into heat - the rest remains as kinetic energy of bulk motion. These
gas-dynamic shocks arise only when the reconnection is impulsive and localized
in all three dimensions; they are distinct from the slow magnetosonic shocks of
the Petschek steady-state reconnection model.


title:
Timescales for Low-Mass Star Formation in Extragalactic Environments:
  Implications for the Stellar IMF

abstract:
  We investigate the physical and chemical conditions necessary for low-mass
star formation in extragalactic environments by calculating various
characteristic timescales associated with star formation for a range of initial
conditions. The balance of these timescales indicates whether low-mass star
formation is enhanced or inhibited under certain physical conditions. In this
study, we consider timescales for free-fall, cooling, freeze-out, desorption,
chemistry and ambipolar diffusion and their variations with changes in the gas
density, metallicity, cosmic ray ionisation rate and FUV radiation field
strength. We find that extragalactic systems with high FUV radiation field
strengths and high cosmic ray fluxes considered at a range of metallicities,
are likely to have enhanced low-mass star formation unless the magnetic
pressure is sufficient to halt collapse. Our results indicate that this is only
likely to be the case for high-redshift galaxies approaching solar
metallicities. Unless this is true for all high-redshift sources, this study
finds little evidence for a high-mass biased IMF at high redshifts.


title:
New infrared cut-off for the holographic scalar fields models of dark
  energy

abstract:
  Introducing a new infrared cut-off for the holographic dark-energy, we study
the correspondence between the quintessence, tachyon, K-essence and dilaton
energy density with this holographic dark energy density in the flat FRW
universe. This correspondence allows to reconstruct the potentials and the
dynamics for the scalar fields models, which describe accelerated expansion.


title: Fits of the Electroweak Standard Model and Beyond using Gfitter

abstract:
  The global fit of the Standard Model to electroweak precision data, routinely
performed by the LEP electroweak working groups and others, has been revisited
in view of (i) the development of the new generic fitting package, Gfitter,
(ii) the insertion of constraints from direct Higgs searches at LEP and
Tevatron, and (iii) a more thorough statistical interpretation of the results.
This paper describes the Gfitter project, and presents state-of-the-art results
for the global electroweak fit in the Standard Model, and for a model with an
extended Higgs sector. Example results are an estimation of the mass of the
Higgs boson (M_H = 116.4^{+18.3}_{-1.3} GeV) and a forth-order result for the
strong coupling strength (alpha_S(M_Z^2) =
0.1193^{+0.0028}_{-0.0027}(exp)+/-0.0001(theo)). Using toy Monte Carlo
techniques the p-value of the SM has been determined (p=0.22). As an example of
a New Physics model constraints are derived for the Two Higgs Doublet Model of
Type-II using observables from the B and K physics sectors.


title: Nuclear DVCS at small-x using the color dipole phenomenology

abstract:
  Using the high energy color dipole formalism, we study the coherent and
incoherent nuclear DVCS process in the small-x regime. We consider simple
models for the elementary dipole-hadron scattering amplitude that captures main
features of the dependence on atomic number A, on energy and on momentum
transfer t. Using the obtained amplitudes we make predictions for the nuclear
DVCS cross section at photon level in the collider kinematics.


title: Improving the precision of gamma/phi_3 via CLEO-c Measurements

abstract:
  Quantum correlations in $\psi(3770) \to D^0\bar{D}^0$ provide unique access
to information about strong phase differences. Precision determination of the
CKM phase $\gamma/\phi_3$ via $B \to D K$ decays depends upon constraints on
charm mixing amplitudes, measurements of doubly-Cabibbo suppressed amplitudes
and relative phases, and studies of correlated charmed meson decays tagged by
flavor or CP eigenstates. CP-tagged $D^0 \to K^-\pi^+\pi^-\pi^+$ decays and
CP-tagged $D^0 \to K^0_S\pi^+\pi^-$ Dalitz plots are only available at CLEO-c.
Using the 818 pb$^{-1}$ CLEO-c data sample produced by the Cornell Electron
Storage Ring (CESR) at $\sqrt{s} = 3.77$ GeV, we perform analyses of these
decays. We describe the techniques used to measure the $D$-decay parameters,
and the CLEO-c impact on measurements of $\gamma/\phi_3$.


title:
Bridging charge-orbital ordering and Fermi surface instabilities in
  half-doped single-layered manganite La_0.5Sr_1.5MnO_4

abstract:
  Density waves are inherent to the phase diagrams of materials that exhibit
unusual, and sometimes extraordinarily useful properties, such as
superconductivity and colossal magnetoresistance. While the pure charge density
waves (CDW) are well described by an itinerant approach, where electrons are
treated as waves propagating through the crystal, the charge-orbital ordering
(COO) is usually explained by a local approach, where the electrons are treated
as localized on the atomic sites. Here we show that in the half-doped manganite
La0.5Sr1.5MnO4 (LSMO) the electronic susceptibility, calculated from the
angle-resolved photoemission spectra (ARPES), exhibits a prominent
nesting-driven peak at one quarter of the Brillouin zone diagonal, that is
equal to the reciprocal lattice vector of the charge-orbital pattern. Our
results demonstrate that the Fermi surface geometry determines the propensity
of the system to form a COO state which, in turn, implies the applicability of
the itinerant approach also to the COO.