title: The PN.S Elliptical Galaxy Survey: the dark matter in NGC 4494

abstract:
  We present new Planetary Nebula Spectrograph observations of the ordinary
elliptical galaxy NGC 4494, resulting in positions and velocities of 255 PNe
out to 7 effective radii (25 kpc). We also present new wide-field surface
photometry from MMT/Megacam, and long-slit stellar kinematics from VLT/FORS2.
The spatial and kinematical distributions of the PNe agree with the field stars
in the region of overlap. The mean rotation is relatively low, with a possible
kinematic axis twist outside 1 Re. The velocity dispersion profile declines
with radius, though not very steeply, down to ~70 km/s at the last data point.
  We have constructed spherical dynamical models of the system, including Jeans
analyses with multi-component LCDM-motivated galaxies as well as logarithmic
potentials. These models include special attention to orbital anisotropy, which
we constrain using fourth-order velocity moments. Given several different sets
of modelling methods and assumptions, we find consistent results for the mass
profile within the radial range constrained by the data. Some dark matter (DM)
is required by the data; our best-fit solution has a radially anisotropic
stellar halo, a plausible stellar mass-to-light ratio, and a DM halo with an
unexpectedly low central density. We find that this result does not
substantially change with a flattened axisymmetric model.
  Taken together with other results for galaxy halo masses, we find suggestions
for a puzzling pattern wherein most intermediate-luminosity galaxies have very
low concentration halos, while some high-mass ellipticals have very high
concentrations. We discuss some possible implications of these results for DM
and galaxy formation.


title: Casimir-like force between intruders in granular gases

abstract:
  We numerically study a two-dimensional granular gas of rigid disks where an
external driving force is applied to each particle in such a way that the
system is driven into a steady state by balancing the energy input and the
dissipation due to inelastic collisions. Two intruder particles embedded in
this correlated medium experience a fluctuation-induced force -- that is itself
a fluctuating quantity -- due to the confinement of the hydrodynamic
fluctuations between them. We find that the probability distribution of this
force is a Gaussian centered on a value that is proportional to the
steady-state temperature and grows logarithmically with system size. We
investigate the effect of the other relevant parameters and estimate the force
using the Fourier transform of the fluctuating hydrodynamic fields.


title:
MAMBO 1.2mm observations of luminous starbursts at z~2 in the SWIRE
  fields

abstract:
  We report on--off pointed MAMBO observations at 1.2 mm of 61 Spitzer-selected
star-forming galaxies from the SWIRE survey. The sources are selected on the
basis of bright 24um fluxes (f_24um>0.4mJy) and of stellar dominated
near-infrared spectral energy distributions in order to favor z~2 starburst
galaxies. The average 1.2mm flux for the whole sample is 1.5+/-0.2 mJy. Our
analysis focuses on 29 sources in the Lockman Hole field where the average
1.2mm flux (1.9+/-0.3 mJy) is higher than in other fields (1.1+/-0.2 mJy). The
analysis of the sources multi-wavelength spectral energy distributions
indicates that they are starburst galaxies with far-infrared luminosities
~10^12-10^13.3 Lsun, and stellar masses of ~0.2-6 x10^11 M_sun. Compared to
sub-millimeter selected galaxies (SMGs), the SWIRE-MAMBO sources are among
those with the largest 24um/millimeter flux ratios. The origin of such large
ratios is investigated by comparing the average mid-infrared spectra and the
stacked far-infrared spectral energy distributions of the SWIRE-MAMBO sources
and of SMGs. The mid-infrared spectra exhibit strong PAH features, and a warm
dust continuum. The warm dust continuum contributes to ~34% of the mid-infrared
emission, and is likely associated with an AGN component. This constribution is
consistent with what is found in SMGs. The large 24um/1.2mm flux ratios are
thus not due to AGN emission, but rather to enhanced PAH emission compared to
SMGs. The analysis of the stacked far-infrared fluxes yields warmer dust
temperatures than typically observed in SMGs. Our selection favors warm
ultra-luminous infrared sources at high-z, a class of objects that is rarely
found in SMG samples. Our sample is the largest Spitzer-selected sample
detected at millimeter wavelengths currently available.


title: The outburst triggered by the Deep Impact collision with Comet Tempel 1

abstract:
  Time variations in velocities and relative amount of observed particles
(mainly icy particles with diameter d<3 {\mu}m) ejected from Comet 9P/Tempel 1
are studied based on analysis of the images made by Deep Impact (DI) cameras
during the first 13 minutes after the collision of the DI impactor with the
comet. Analysis of maxima or minima of plots of the time variations in
distances of contours of constant brightness from the place of ejection allowed
us to estimate the characteristic velocities of particles at several moments in
time te of ejection after impact for te $\leq$ 115 s. Other approaches for
estimates of the velocities were also used. All these estimates are in
accordance with the same exponential decrease in velocity. The estimates of
time variations in the relative amount of ejected particles were based also on
results of the analysis of time variations in the size of the bright region of
ejected material. At te~10 s, the morphology of the ejecta (e.g. the location
and brightness of the brightest pixel) changed and the rate rte of ejection of
observed material increased. Between 1 and 3 seconds after the impact and
between 8 and 60 seconds after the impact, more small bright particles were
ejected than expected from crater excavation alone. An outburst triggered by
the impact could cause such a difference. The sharp (by a factor of 1.6)
decrease in the rate of ejection at 55<te<72 s could be caused by a decrease in
the outburst that began at 10 s. Analysis of observations of the DI cloud and
of the outbursts from some comets testifies in favour of the proposition that
there can be large cavities, with material under gas pressure, below a
considerable fraction of a comet's surface. Internal gas pressure and material
in the cavities can produce natural and triggered outbursts and can cause
splitting of comets.


title: Expansive actions on uniform spaces and surjunctive maps

abstract:
  We present a uniform version of a result of M. Gromov on the surjunctivity of
maps commuting with expansive group actions and discuss several applications.
We prove in particular that for any group $\Gamma$ and any field $\K$, the
space of $\Gamma$-marked groups $G$ such that the group algebra $\K[G]$ is
stably finite is compact.


title: Grover's Quantum Search Algorithm and Free Fermionic Heterotic Models

abstract:
  Given an efficient and systematic method for generating input sets for free
fermionic heterotic model building we consider what the realistic bounds are
for a statistical analysis of the free fermionic Landscape with a classical
computer. We then consider what kind of improvement could be expected on a
quantum computer. We do outline the basic structure of the relevant quantum
algorithms, but we do not detail the construction of the oracle which would be
involved in the calculations.


title: On the common mass scale of the Milky Way satellites

abstract:
  We use a hybrid approach that combines high-resolution simulations of the
formation of a Milky Way-like halo with a semi-analytic model of galaxy
formation to study the mass content of dwarf galaxies in the concordance
$\Lambda$CDM cosmology. We find that the mass within 600 pc of dark matter
haloes hosting luminous satellites has a median value of $\sim 3.2\times 10^7$
Msun with very little object-to-object scatter. In contrast, the present day
total luminosities of the model satellites span nearly five orders of
magnitude. These findings are in very good agreement with the results recently
reported in the literature for the dwarf spheroidal galaxies of the Milky Way.
In our model, dwarf irregular galaxies like the Small Magellanic Cloud, are
predicted to have similar or slightly larger dark matter mass within 600 pc.


title: Low Mass Star Formation in the Taurus-Auriga Clouds

abstract:
  We review the history and structure of star formation in the Taurus-Auriga
dark clouds. Our discussion includes a summary of the macroscopic cloud
properties, the population of single and binary pre-main sequence stars, the
properties of jets and outflows, and detailed summaries of selected individual
objects. We include comprehensive tables of dark clouds, young stars, and jets
in the clouds.


title:
Corotational Damping of Diskoseismic C-modes in Black Hole Accretion
  Discs

abstract:
  Diskoseismic c-modes in accretion discs have been invoked to explain
low-frequency variabilities observed in black-hole X-ray binaries. These modes
are trapped in the inner-most region of the disc and have frequencies much
lower than the rotation frequency at the disc inner radius. We show that
because the trapped waves can tunnel through the evanescent barrier to the
corotational wave zone, the c-modes are damped due to wave absorption at the
corotation resonance. We calculate the corotational damping rates of various
c-modes using the WKB approximation. The damping rate varies widely depending
on the mode frequency, the black hole spin parameter and the disc sound speed,
and is generally much less than 10% of the mode frequency. A sufficiently
strong excitation mechanism is needed to overcome this corotational damping and
make the mode observable.


title:
Initial-boundary value problems for discrete evolution equations:
  discrete linear Schrodinger and integrable discrete nonlinear Schrodinger
  equations

abstract:
  We present a method to solve initial-boundary value problems for linear and
integrable nonlinear differential-difference evolution equations. The method is
the discrete version of the one developed by A. S. Fokas to solve
initial-boundary value problems for linear and integrable nonlinear partial
differential equations via an extension of the inverse scattering transform.
The method takes advantage of the Lax pair formulation for both linear and
nonlinear equations, and is based on the simultaneous spectral analysis of both
parts of the Lax pair. A key role is also played by the global algebraic
relation that couples all known and unknown boundary values. Even though
additional technical complications arise in discrete problems compared to
continuum ones, we show that a similar approach can also solve initial-boundary
value problems for linear and integrable nonlinear differential-difference
equations. We demonstrate the method by solving initial-boundary value problems
for the discrete analogue of both the linear and the nonlinear Schrodinger
equations, comparing the solution to those of the corresponding continuum
problems. In the linear case we also explicitly discuss Robin-type boundary
conditions not solvable by Fourier series. In the nonlinear case we also
identify the linearizable boundary conditions, we discuss the elimination of
the unknown boundary datum, we obtain explicitly the linear and continuum limit
of the solution, and we write down the soliton solutions.


title: On the Role of Low-Energy CP Violation in Leptogenesis

abstract:
  The link between low-energy CP violation and leptogenesis became more
accessible with the understanding of flavor effects. However, a definite
well-motivated model where such a link occurs was still lacking. Adjoint SU(5)
is a simple grand unified theory where neutrino masses are generated through
the Type I and Type III seesaw mechanisms, and the lepton asymmetry is
generated by the fermionic triplet responsible for the Type III seesaw. We
focus exclusively on the case of inverted hierarchy for neutrinos, and we show
that successful flavored leptogenesis in this theory strongly points towards
low-energy CP violation. Moreover, since the range of allowed masses for the
triplet is very restricted, we find that the discovery at the LHC of new states
present in the theory, together with proton decay and unification of gauge
couplings, can conspire to provide a hint in favor of leptogenesis.


title: Isospin symmetry breaking effects in the pion and nucleon masses

abstract:
  We investigate the electromagnetic mass splittings in the pseudoscalar meson
and nucleon systems by combining 2+1 flavor domain wall fermion gauge
configurations, generated by the RBC and UKQCD collaborations, and quenched,
non-compact, lattice QED configurations. We analyze finite volume effects by
using $16^3\times 32$ and $24^3\times 64$ lattices.


title: How Delicate is Brane-Antibrane Inflation?

abstract:
  We systematically explore the parameter space of the state-of-the-art
brane-antibrane inflation model (Baumann {\it et al}., arXiv:0706.0360,
arXiv:0705.3837) which is one of the most rigorously derived from string
theory, applying the cosmic background explorer normalization and constraint on
the spectral index. We improve on previous treatments of uplifting by
antibranes and show that the contributions from noninflationary throats play an
important role in achieving a flat inflationary potential. To quantify the
degree of fine-tuning needed by the model, we define an effective volume in the
part of parameter space which is consistent with experimental constraints, and
using Monte Carlo methods to search for a set of optimal parameters, we show
that the degree of fine-tuning is alleviated by 8 orders of magnitude relative
to a fiducial point which has previously been considered. In fact, close to the
optimal parameter values, fine-tuning is no longer needed for any of the
parameters. We show that in this natural region of the parameter space, larger
values of $n_s$ close to 0.99 (still within 2$\sigma$ of the WMAP5 central
value) are favored, giving a new aspect of testability to the model.


title:
Quantifying the performance of jet definitions for kinematic
  reconstruction at the LHC

abstract:
  We present a strategy to quantify the performance of jet definitions in
kinematic reconstruction tasks. It is designed to make use exclusively of
physical observables, in contrast to previous techniques which often used
unphysical Monte Carlo partons as a reference. It is furthermore independent of
the detailed shape of the kinematic distributions. We analyse the performance
of 5 jet algorithms over a broad range of jet-radii, for sources of quark jets
and gluon jets, spanning the energy scales of interest at the LHC, both with
and without pileup. The results allow one to identify optimal jet definitions
for the various scenarios. They confirm that the use of a small jet radius
(R\simeq 0.5) for quark-induced jets at moderate energy scales, O(100 GeV), is
a good choice. However, for gluon jets and in general for TeV scales, there are
significant benefits to be had from using larger radii, up to R\gtrsim 1. This
has implications for the span of jet-definitions that the LHC experiments
should provide as defaults for searches and other physics analyses.


title:
Directly Indecomposables in Semidegenerate Varieties of Connected
  po-Groupoids

abstract:
  We study varieties with a term-definable poset structure, "po-groupoids". It
is known that connected posets have the "strict refinement property" (SRP). In
[arXiv:0808.1860v1 [math.LO]] it is proved that semidegenerate varieties with
the SRP have definable factor congruences and if the similarity type is finite,
directly indecomposables are axiomatizable by a set of first-order sentences.
We obtain such a set for semidegenerate varieties of connected po-groupoids and
show its quantifier complexity is bounded in general.


title: Ultracold Heteronuclear Fermi-Fermi Molecules

abstract:
  We report on the first creation of ultracold bosonic heteronuclear molecules
of two fermionic species, 6Li and 40K, by a magnetic field sweep across an
interspecies s-wave Feshbach resonance. This allows us to associate up to
4x10^4 molecules with high efficiencies of up to 50%. Using direct imaging of
the molecules, we measure increased lifetimes of the molecules close to
resonance of more than 100 ms in the molecule-atom mixture stored in a harmonic
trap.


title:
The dynamics of cargo driven by molecular motors in the context of
  asymmetric simple exclusion processes

abstract:
  We consider the dynamics of cargo driven by a collection of interacting
molecular motors in the context of an asymmetric simple exclusion processes
(ASEP). The model is formulated to account for i) excluded volume interactions,
ii) the observed asymmetry of the stochastic movement of individual motors and
iii) interactions between motors and cargo. Items (i) and (ii) form the basis
of ASEP models and have already been considered in the literature to study the
behavior of motor density profile [Parmeggiani 03]. Item (iii) is new. It is
introduced here as an attempt to describe explicitly the dependence of cargo
movement on the dynamics of motors. The steady-state solutions of the model
indicate that the system undergoes a phase transition of condensation type as
the motor density varies. We study the consequences of this transition to the
properties of cargo velocity.


title: Non-equilibrium Tunneling Spectroscopy in Carbon Nanotubes

abstract:
  We report measurements of the non-equilibrium electron energy distribution in
carbon nanotubes. Using tunneling spectroscopy via a superconducting probe, we
study the shape of the local electron distribution functions, and hence energy
relaxation rates, in nanotubes that have bias voltages applied between their
ends. At low temperatures, electrons interact weakly in nanotubes of a few
microns channel length, independent of end-to-end conductance values.
Surprisingly, the energy relaxation rate can increase substantially when the
temperature is raised to only 1.5 K.


title:
Interface Ferromagnetism in (110)-Oriented La0.7Sr0.3MnO3/SrTiO3
  Ultrathin Superlattices

abstract:
  We explore manganite interface magnetism in epitaxially grown
La0.7Sr0.3MnO3(LSMO)/SrTiO3 ultrathin superlattices (SL) along (110)
orientation. we show that robust ferromagnetism persists down to four
monolayers LSMO(MLs) (~1.1 nm in thickness), of which 50% Mn is at the
interface state. Above eight MLs, the magnetic moment is nearly saturated to
the theoretical value of 3.7u_B, with an estimated interface moment of 3.2u_B.
In comparison to (100)-oriented SLs which were previously shown to have a spin
canted ground state, (110)-oriented SLs exhibit stronger low-dimensional
ferromagnetism and better metallicity, suggesting a ferromagnetic interface
spin state well suited for all-oxide spintronic devices. The underlining
mechanism is qualitatively discussed.


title:
Towards a unified approach to information-disturbance tradeoffs in
  quantum measurements

abstract:
  We show that the global balance of information dynamics for general quantum
measurements given in [F. Buscemi, M. Hayashi, and M. Horodecki, Phys.Rev.Lett.
100, 210504 (2008)] makes it possible to unify various and generally
inequivalent approaches adopted in order to derive information-disturbance
tradeoffs in quantum theory. We focus in particular on those tradeoffs,
constituting the vast majority of the literature on the subject, where
disturbance is defined either in terms of average output fidelity or of
entanglement fidelity.


title: QCD Thermodynamics with Domain Wall Fermions

abstract:
  We present our recent studies of the pseudo-critical temperature, $T_c$, of
QCD using domain wall fermions. Domain wall fermions have the advantage that
they preserve exact SU(2) chiral symmetry at finite lattice spacing in the
limit that $L_s \to \infty$. The RBC Collaboration has performed a set of
dynamical calculations at $L_s = 32$ and $N_t = 8$ using the Iwasaki gauge
action with two light quarks ($m_l a = 0.003$) and one strange quark ($m_s a =
0.037$). A clear signal for the crossover transition can be seen in the light
chiral susceptibility, as well as in the Wilson line. However, at $L_s = 32$,
the residual chiral symmetry breaking is not yet fully under control. We also
present preliminary results from the HotQCD Collaboration with $N_t = 8$ and
$L_s = 96$, where the effects of the residual chiral symmetry breaking are
reduced compared to $L_s = 32$.


title:
Proceedings of SuperB Workshop VI: New Physics at the Super Flavor
  Factory

abstract:
  The sixth SuperB Workshop was convened in response to questions posed by the
INFN Review Committee, evaluating the SuperB project at the request of INFN.
The working groups addressed the capability of a high-luminosity flavor factory
that can gather a data sample of 50 to 75 /ab in five years to elucidate New
Physics phenomena unearthed at the LHC. This report summarizes the results of
the Workshop.


title: Motives associated to sums of graphs

abstract:
  The Feynman amplitude associated to a graph is a period of a certain motive.
The sum of these motive classes over all connected graphs with no multiple
edges or tadpoles and n vertices is defined in the Grothendieck ring of
varieties. This sum is shown to lie in the subring generated by the affine
line. It follows from work of Belkale and Brosnan that motives of individual
graphs do not lie in this subring.


title: Transverse momentum diffusion and jet energy loss in non-Abelian plasmas

abstract:
  We consider momentum broadening and energy loss of high momentum partons in a
hot non-Abelian plasma due to collisions. We solve the coupled system of
Wong-Yang-Mills equations on a lattice in real time, including binary hard
elastic collisions among the partons. The collision kernel is constructed such
that the total collisional energy loss and momentum broadening are lattice
spacing independent. We find that the transport coefficient $\hat{q}$
corresponding to transverse momentum broadening receives sizable contributions
from a power-law tail in the $p_\perp$-distribution of high-momentum partons.
We establish the scaling of $\hat{q}$ and of $dE/dx$ with density, temperature
and energy in the weak-coupling regime. We also estimate the nuclear
modification factor $R_{AA}$ due to elastic energy loss of a jet in a classical
Yang-Mills field.


title: Tuning HMC using Poisson brackets

abstract:
  We discuss how the integrators used for the Hybrid Monte Carlo (HMC)
algorithm not only approximately conserve some Hamiltonian $H$ but exactly
conserve a nearby shadow Hamiltonian (\tilde H), and how the difference $\Delta
H \equiv \tilde H - H $ may be expressed as an expansion in Poisson brackets.
By measuring average values of these Poisson brackets over the equilibrium
distribution $\propto e^{-H}$ generated by HMC we can find the optimal
integrator parameters from a single simulation. We show that a good way of
doing this in practice is to minimize the variance of $\Delta H$ rather than
its magnitude, as has been previously suggested. Some details of how to compute
Poisson brackets for gauge and fermion fields, and for nested and force
gradient integrators are also presented.


title: The meaning of concurrent programs

abstract:
  The semantics of assignment and mutual exclusion in concurrent and
multi-core/multi-processor systems is presented with attention to low level
architectural features in an attempt to make the presentation realistic.
Recursive functions on event sequences are used to define state dependent
functions and variables in ordinary (non-formal-method) algebra.


title: Cosmological bounds on the "millicharges" of mirror particles

abstract:
  Mirror world, a parallel hidden sector with microphysics identical to
ordinary particle physics, can have several interesting phenomenological and
astrophysical implications and mirror matter can be a natural candidate for
dark matter in the universe. If the ordinary and the mirror photons have a
kinetic mixing due to the Lagrangian term $(\epsilon/2) F_{\mu\nu}
F'^{\mu\nu}$, then mirror particles effectively acquire the electric charges
$\sim \epsilon$ with respect to the ordinary photon, so that they become a sort
of particles historically coined as "millicharged" though nowadays they must be
called more appropriately as "nanocharged". In this paper we revise the
cosmological bounds on the kinetic mixing parameter and in the case of exact
mirror parity set an upper limit $\epsilon < 3 \times 10^{-10}$. Much weaker
limit can be obtained in the case of asymmetric mirror sector, with an
electroweak symmetry breaking scale larger than the ordinary electroweak scale.


title:
Inspecting absorption in the spectra of extra-galactic gamma-ray sources
  for insight into Lorentz invariance violation

abstract:
  We examine what the absorbed spectra of extra-galactic TeV gamma-ray sources,
such as blazars, would look like in the presence of Lorentz invariance
violation (LIV). Pair-production with the extra-galactic background light
modifies the observed spectra of such sources, and we show that a violation of
Lorentz invariance would generically have a dramatic effect on this absorption
feature. Inspecting this effect, an experimental task likely practical in the
near future, can provide unique insight on the possibility of LIV.


title: ARQ-Based Secret Key Sharing

abstract:
  This paper develops a novel framework for sharing secret keys using existing
Automatic Repeat reQuest (ARQ) protocols. Our approach exploits the multi-path
nature of the wireless environment to hide the key from passive eavesdroppers.
The proposed framework does not assume the availability of any prior channel
state information (CSI) and exploits only the one bit ACK/NACK feedback from
the legitimate receiver. Compared with earlier approaches, the main innovation
lies in the distribution of key bits among multiple ARQ frames. Interestingly,
this idea allows for achieving a positive secrecy rate even when the
eavesdropper experiences more favorable channel conditions, on average, than
the legitimate receiver. In the sequel, we characterize the information
theoretic limits of the proposed schemes, develop low complexity explicit
implementations, and conclude with numerical results that validate our
theoretical claims.


title:
Time evolution of dynamic propensity in a model glass former. The
  interplay between structure and dynamics

abstract:
  By means of the isoconfigurational method we calculate the change in the
propensity for motion that the structure of a glass-forming system experiences
during its relaxation dynamics. The relaxation of such a system has been
demonstrated to evolve by means of rapid crossings between metabasins of its
potential energy surface (a metabasin being a group of mutually similar,
closely related structures which differ markedly from other metabasins), as
collectively relaxing units (d-clusters) take place. We now show that the
spatial distribution of propensity in the system does not change significantly
until one of these d-clusters takes place. However, the occurrence of a
d-cluster clearly de-correlates the propensity of the particles, thus ending up
with the dynamical influence of the structural features proper of the local
metabasin. We also show an important match between particles that participate
in d-clusters and that which show high changes in their propensity.


title:
Induced p-wave superfluidity in two dimensions: Brane world in cold
  atoms and nonrelativistic defect CFTs

abstract:
  We propose to use a two-species Fermi gas with the interspecies s-wave
Feshbach resonance to realize p-wave superfluidity in two dimensions. By
confining one species of fermions in a two-dimensional plane immersed in the
background three-dimensional Fermi sea of the other species, an attractive
interaction is induced between two-dimensional fermions. We compute the pairing
gap in the weak-coupling regime and show that it has the symmetry of p_x+ip_y.
Because the magnitude of the pairing gap increases toward the unitarity limit,
it is possible that the critical temperature for the p_x+ip_y-wave
superfluidity becomes within experimental reach. The resulting system has a
potential application to topological quantum computation using vortices with
non-Abelian statistics. We also discuss aspects of our system in the unitarity
limit as a "nonrelativistic defect conformal field theory (CFT)". The reduced
Schr\"odinger algebra, operator-state correspondence, scaling dimensions of
composite operators, and operator product expansions are investigated.


title:
The rotating Morse potential model for diatomic molecules in the
  J-matrix representation: II. The S-matrix approach

abstract:
  This is the second article in which we study the rotating Morse potential
model for diatomic molecules using the tridiagonal J-matrix approach. Here, we
improve further the accuracy of computing the bound states and resonance
energies for this potential model from the poles of the S-matrix for arbitrary
angular momentum. The calculation is performed using an infinite square
integrable basis that supports a tridiagonal matrix representation for the
reference Hamiltonian, which is included in the computations analytically
without truncation. Our method has been applied to both the regular and
inverted Morse potential with favorable results in comparison with available
numerical data. We have also shown that the present method adds few significant
digits to the accuracy obtained from the finite dimensional approach (e.g. the
complex rotation method). Moreover, it allows us to handle easily both analytic
and non-analytic potentials as well as 1/r singular potentials.


title: QED Energy-Momentum Trace as a Force in Astrophysics

abstract:
  We study the properties of the trace $\Tmm$ of the QED energy-momentum tensor
in the presence of quasi-constant external electromagnetic fields. We exhibit
the origin of $\Tmm$ in the quantum nonlinearity of the electromagnetic theory.
We obtain the quantum vacuum fluctuation-induced interaction of a particle with
the field of a strongly magnetized compact stellar object.


title:
Propagation of Electromagnetic Waves in Resistive Pair Plasma and Causal
  Relativistic Magnetohydrodynamics

abstract:
  We investigate the propagation of electromagnetic waves in resistive pair
plasmas using a onefluid theory derived from the relativistic two-fluid
equations. When the resistivity normalized by the electron/positron inertia
variable exceeds a critical value, the dispersion relation for electromagnetic
waves shows that the group velocity is larger than the light speed in vacuum.
However, in such a case, it also is found that the plasma parameter is less
than unity: that is, the electron-positron pair medium no longer can be treated
as plasma. Thus the simple two-fluid approximation is invalid. This confirms
that superluminal propagation of electromagnetic wave is forbidden in a plasma
-- a conclusion consistent with the relativistic principle of causality. As an
alternative, we propose a new set of equations for ``causal relativistic
magnetohydrodynamics", which both have non-zero resistivity and yet are
consistent with the causality principle.


title:
Test of some Fundamental Principles in Physics via Quantum Interference
  with Neutrons and Photons

abstract:
  The limitations and possibilities that the concept of quantum interference
offers as a tool for testing fundamental physics are explored here. The use of
neutron interference as an instrument to confront against measurement readouts
some of the principles behind metric theories of gravity will be analyzed, as
well as some discrepancies between theory and experiment. The main restrictions
that this model embodies for the study of some of the features of the structure
of space--time will be explicitly pointed out. For instance, the conditions
imposed by the necessary use of the semiclassical approximation. Additionally,
the role that photon interference could play as an element in this context is
also considered. In this realm we explore the differences between first-order
and second-order coherence experiments, and underline the fact that the
Hanbury--Brown--Twiss effect could open up some interesting experimental
possibilities in the analysis of the structure of space--time. The void, in
connection with the description of wave phenomena, implicit in the principles
of metric theories is analyzed. The conceptual difficulties, that this void
entails, are commented.


title: NOIRCAT - The Northern HIPASS Optical/IR Catalogue

abstract:
  We present the Northern HIPASS Optical/InfraRed CATalogue (NOIRCAT), an
optical/near-infrared counterpart to the Northern HIPASS catalogue (NHICAT). Of
the 1002 sources in NHICAT, 655 (66%) have optical counterparts with matching
optical velocities. A further 85 (8%) sources have optical counterparts with
matching velocities from previous radio emission-line surveys. We find a
correlation between the gas and stellar content of the NOIRCAT sources. Our
HI-selected sample of isolated galaxies also present a wider range in
near-infrared (NIR) colours than previous optically-selected studies of
regular, isolated galaxies. All HI detections in optically unobscured fields
could be matched with either a NED optical counterpart, or a galaxy visible in
POSSII or DSS images. However, as over 200 of these matched galaxies have no
velocity information, further follow-up observations are needed to confirm the
matches, and hence confirm or deny the existence of dark galaxies in this
dataset.


title:
Comprehensive structural classification of ligand binding motifs in
  proteins

abstract:
  Comprehensive knowledge of protein-ligand interactions should provide a
useful basis for annotating protein functions, studying protein evolution,
engineering enzymatic activity, and designing drugs. To investigate the
diversity and universality of ligand binding sites in protein structures, we
conducted the all-against-all atomic-level structural comparison of over
180,000 ligand binding sites found in all the known structures in the Protein
Data Bank by using a recently developed database search and alignment
algorithm. By applying a hybrid top-down-bottom-up clustering analysis to the
comparison results, we determined approximately 3000 well-defined structural
motifs of ligand binding sites. Apart from a handful of exceptions, most
structural motifs were found to be confined within single families or
superfamilies, and to be associated with particular ligands. Furthermore, we
analyzed the components of the similarity network and enumerated more than 4000
pairs of ligand binding sites that were shared across different protein folds.


title:
Effective field theory calculation of second post-Newtonian binary
  dynamics

abstract:
  We use the effective field theory for gravitational bound states, proposed by
Goldberger and Rothstein, to compute the interaction Lagrangian of a binary
system at the second Post-Newtonian order. Throughout the calculation, we use a
metric parametrization based on a temporal Kaluza-Klein decomposition and test
the claim by Kol and Smolkin that this parametrization provides important
calculational advantages. We demonstrate how to use the effective field theory
method efficiently in precision calculations, and we reproduce known results
for the second Post-Newtonian order equations of motion in harmonic gauge in a
straightforward manner.


title:
Accuracy of the Tracy-Widom limit for the largest eigenvalue in white
  Wishart matrices

abstract:
  Let A be a p-variate real Wishart matrix on n degrees of freedom with
identity covariance. The distribution of the largest eigenvalue in A has
important applications in multivariate statistics. Consider the asymptotics
when p grows in proportion to n, it is known from Johnstone (2001) that after
centering and scaling, these distributions approach the orthogonal Tracy-Widom
law for real-valued data, which can be numerically evaluated and tabulated in
software.
  Under the same assumption, we show that more carefully chosen centering and
scaling constants improve the accuracy of the distributional approximation by
the Tracy-Widom limit to second order: O(min(n,p)^{-2/3}). Together with the
numerical simulation, it implies that the Tracy-Widom law is an attractive
approximation to the distributions of these largest eigenvalues, which is
important for using the asymptotic result in practice. We also provide a
parallel accuracy result for the smallest eigenvalue of A when n > p.


title:
The August 24, 2002 Coronal Mass Ejection: When a Western Limb Event
  Connects to Earth

abstract:
  We discuss how some coronal mass ejections (CMEs) originating from the
western limb of the Sun are associated with space weather effects such as solar
energetic particles (SEPs), shock or geo-effective ejecta at Earth. We focus on
the August 24, 2002 coronal mass ejection, a fast (~ 2000 km/s) eruption
originating from W81. Using a three-dimensional magneto-hydrodynamic simulation
of this ejection with the Space Weather Modeling Framework (SWMF), we show how
a realistic initiation mechanism enables us to study the deflection of the CME
in the corona and the heliosphere. Reconnection of the erupting magnetic field
with that of neighboring streamers and active regions modify the solar
connectivity of the field lines connecting to Earth and can also partly explain
the deflection of the eruption during the first tens of minutes. Comparing the
results at 1 AU of our simulation with observations by the ACE spacecraft, we
find that the simulated shock does not reach Earth, but has a maximum angular
span of about 120$^\circ$, and reaches 35$^\circ$ West of Earth in 58 hours. We
find no significant deflection of the CME and its associated shock wave in the
heliosphere, and we discuss the consequences for the shock angular span.


title: Searching for the elusive graviton

abstract:
  We present a search for large extra dimensions in the single photon plus
missing transverse energy channel (Kaluza-Klein graviton production) performed
using 2.7 fb-1 of data collected by the D0 experiment at the Fermilab Tevatron
collider. At 95% C.L., we set limits on the fundamental Planck scale M_{D} from
970 GeV to 816 GeV for two to eight extra dimensions.


title:
Tailored photon pair preparation relying on full group velocity matching
  in fibre-based spontaneous four wave mixing

abstract:
  We study photon pair generation through scalar spontaneous four-wave mixing
in single-mode fibre and for frequency-degenerate pumps; we concentrate on
source geometries which fulfil full group velocity matching (GVM), i.e. where
the pump, signal and idler propagate at identical group velocities. We discuss
two experimental techniques which permit the attainment of full GVM, and
discuss the resulting two-photon state properties. In particular, we show that
full GVM can lead to sources which approach phasematching unconstrained by
dispersion and therefore with a remarkably large bandwidth. We also discuss the
generation of nearly-factorablestates as an application of full GVM.


title:
Ultra-broadband photon pair preparation by spontaneous four wave mixing
  in dispersion-engineered optical fiber

abstract:
  We present a study of the spectral properties of photon pairs generated
through the process of spontaneous four wave mixing (SFWM) in single mode
fiber. Our analysis assumes narrowband pumps, which are allowed to be
frequency-degenerate or non-degenerate. Based on this analysis, we derive
conditions on the pump frequencies and on the fiber dispersion parameters which
guarantee the generation of ultra-broadband photon pairs. Such photon pairs are
characterized by: i) a very large degree of entanglement, and ii) a very high
degree of temporal synchronization between the signal and idler photons.
Through a numerical exercise, we find that the use of photonic crystal fiber
(PCF) facilitates the fulfilment of the conditions for ultra-broadband photon
pair generation; in particular, the spectral region in which emission occurs
can be adjusted to particular needs through an appropriate choice of the PCF
parameters. In addition, we present a novel quantum interference effect,
resulting from indistinguishable pathways to the same outcome, which can occur
when pumping a SFWM source with multiple spectral lines.


title:
Saturation of Two Level Systems and Charge Noise in Josephson Junction
  Qubits

abstract:
  We study the charge noise $S_Q$ in Josephson qubits produced by fluctuating
two level systems (TLS) with electric dipole moments in the substrate. The TLS
are driven by an alternating electric field of angular frequency $\Omega$ and
electric field intensity $I$. It is not widely appreciated that TLS in small
qubits can easily be strongly saturated if $I\gg I_c$, where $I_c$ is the
critical electric field intensity. To investigate the effect of saturation on
the charge noise, we express the noise spectral density in terms of density
matrix elements. To determine the dependence of the density matrix elements on
the ratio $I/I_c$, we find the steady state solution for the density matrix
using the Bloch-Redfield differential equations. We then obtain an expression
for the spectral density of charge fluctuations as a function of frequency $f$
and the ratio $I/I_c$. We find $1/f$ charge noise at low frequencies, and that
the charge noise is white (constant) at high frequencies. Using a flat density
of states, we find that TLS saturation has no effect on the charge noise at
either high or low frequencies.


title:
Approximation theorems for Banach-valued almost periodic and semi-almost
  periodic holomorphic functions

abstract:
  The paper studies semi-almost periodic holomorphic functions on a polydisk
which have, in a sense, the weakest possible discontinuities on the boundary
torus. The basic result used in the proofs is an extension of the classical
Bohr approximation theorem for almost periodic holomorphic functions on a strip
to the case of Banach-valued almost periodic holomorphic functions.


title:
Dispersive regime of circuit QED: photon-dependent qubit dephasing and
  relaxation rates

abstract:
  Superconducting electrical circuits can be used to study the physics of
cavity quantum electrodynamics (QED) in new regimes, therefore realizing
circuit QED. For quantum information processing and quantum optics, an
interesting regime of circuit QED is the dispersive regime, where the detuning
between the qubit transition frequency and the resonator frequency is much
larger than the interaction strength. In this paper, we investigate how
non-linear corrections to the dispersive regime affect the measurement process.
We find that in the presence of pure qubit dephasing, photon population of the
resonator used for the measurement of the qubit act as an effective heat bath,
inducing incoherent relaxation and excitation of the qubit. Measurement thus
induces both dephasing and mixing of the qubit, something that can reduce the
quantum non-demolition aspect of the readout. Using quantum trajectory theory,
we show that this heat bath can induce quantum jumps in the qubit state and
reduce the achievable signal-to-noise ratio of a homodyne measurement of the
voltage.


title:
On the relative and bi-relative K-theory of rings of finite
  characteristic

abstract:
  We prove that the relative K-groups associated with a nilpotent extension of
Z/p^N Z-algebras and the bi-relative K-groups associated with a Milnor square
of Z/p^N Z-algebras are p-primary torsion groups of bounded exponent. We also
show that, in general, the cyclotomic trace map extends from Quillen K-theory
to Bass completed non-connective algebraic K-theory.


title: Vortex phase diagram of Ba(Fe0.93Co0.07)2As2 single crystals

abstract:
  Detailed measurements of the global and local electromagnetic properties of
Ba(Fe$_{0.93}$Co$_{0.07}$)$_{2}$As$_{2}$ single crystals are reported. Analysis
of the irreversible magnetic response provides strong evidence for similar
vortex physics in this Fe-based pnictide superconductor to the high-$T_{c}$
cuprates, such as Y-Ba-Cu-O or Nd-Ce-Cu-O. In particular, we have found a
nonmonotonic "fishtail" magnetization in $M(H,T=const)$ loops and its signature
is also present in $M(H=const,T)$ scans. The supercurrent density is evaluated
by using several techniques, including direct transport measurements. At 5 K we
estimate its value to be a moderate $j \approx 2.6 \pm 0.2 \times 10^5$
A/cm$^2$. Analysis of the magnetic relaxation is consistent with the collective
pinning and creep models (weak pinning and fast creep) and suggests a crossover
from the collective to the plastic creep regime in fields exceeding the value
corresponding to the maximum in fishtail magnetization.


title: Stratifying modular representations of finite groups

abstract:
  We classify localising subcategories of the stable module category of a
finite group that are closed under tensor product with simple (or, equivalently
all) modules. One application is a proof of the telescope conjecture in this
context. Others include new proofs of the tensor product theorem and of the
classification of thick subcategories of the finitely generated modules which
avoid the use of cyclic shifted subgroups. Along the way we establish similar
classifications for differential graded modules over graded polynomial rings,
and over graded exterior algebras.


title: Transverse spin diffusion in ferromagnets

abstract:
  We discuss the dissipative diffusion-type term of the form
$\mathbf{m}\times\nabla^2\partial_t\mathbf{m}$ in the phenomenological
Landau-Lifshitz equation of ferromagnetic precession, which describes enhanced
Gilbert damping of finite-momentum spin waves. This term arises physically from
itinerant-electron spin flows through a perturbed ferromagnetic configuration
and can be understood to originate in the ferromagnetic spin pumping in the
continuum limit. We develop a general phenomenology as well as provide
microscopic theory for the Stoner and s-d models of ferromagnetism, taking into
account disorder and electron-electron scattering. The latter is manifested in
our problem through the Coulomb drag between the spin bands. The spin diffusion
is identified in terms of the transverse spin conductivity, in analogy with the
Einstein relation in the kinetic theory.


title:
Self-Similar Solution of Hot Accretion Flows with Ordered Magnetic Field
  and Outflow

abstract:
  Observations and numerical magnetohydrodynamic (MHD) simulations indicate the
existence of outflows and ordered large-scale magnetic fields in the inner
region of hot accretion flows. In this paper we present the self-similar
solutions for advection-dominated accretion flows (ADAFs) with outflows and
ordered magnetic fields. Stimulated by numerical simulations, we assume that
the magnetic field has a strong toroidal component and a vertical component in
addition to a stochastic component. We obtain the self-similar solutions to the
equations describing the magnetized ADAFs, taking into account the dynamical
effects of the outflow. We compare the results with the canonical ADAFs and
find that the dynamical properties of ADAFs such as radial velocity, angular
velocity and temperature can be significantly changed in the presence of
ordered magnetic fields and outflows. The stronger the magnetic field is, the
lower the temperature of the accretion flow will be, and the faster the flow
rotates. The relevance to observations is briefly discussed.


title: 2-universal Hermitian lattices over imaginary quadratic fields

abstract:
  A positive definite Hermitian lattice is said to be 2-universal if it
represents all positive definite binary Hermitian lattices. We find all
2-universal ternary and quaternary Hermitian lattices over imaginary quadratic
number fields.


title:
Graphical description of local Gaussian operations for
  continuous-variable weighted graph states

abstract:
  The form of a local Clifford (LC, also called local Gaussian (LG)) operation
for the continuous-variable (CV) weighted graph states is presented in this
paper, which is the counterpart of the LC operation of local complementation
for qubit graph states. The novel property of the CV weighted graph states is
shown, which can be expressed by the stabilizer formalism. It is distinctively
different from the qubit weighted graph states, which can not be expressed by
the stabilizer formalism. The corresponding graph rule, stated in purely graph
theoretical terms, is described, which completely characterizes the evolution
of CV weighted graph states under this LC operation. This LC operation may be
applied repeatedly on a CV weighted graph state, which can generate the
infinite LC equivalent graph states of this graph state. This work is an
important step to characterize the LC equivalence class of CV weighted graph
states.


title: Enumeration of bilaterally symmetric 3-noncrossing partitions

abstract:
  Schutzenberger's theorem for the ordinary RSK correspondence naturally
extends to Chen et. al's correspondence for matchings and partitions. Thus the
counting of bilaterally symmetric $k$-noncrossing partitions naturally arises
as an analogue for involutions. In obtaining the analogous result for
3-noncrossing partitions, we use a different technique to develop a Maple
package for 2-dimensional vacillating lattice walk enumeration problems. The
package also applies to the hesitating case. As applications, we find several
interesting relations for some special bilaterally symmetric partitions.


title:
Spontaneous symmetry breaking approach to La2CuO4 properties: hints for
  matching the Mott and Slater pictures

abstract:
  Special solutions of the Hartree-Fock (HF) problem for Coulomb interacting
electrons, being described by a simple model of the Cu-O planes in La2CuO4, are
presented. One of the mean field states obtained, is able to predict some of
the basic properties of this material, such as its insulator character and the
antiferromagnetic order. The natural appearance of pseudogaps in some states of
this compound is also indicated by another of the HF states obtained. These
surprising results follow after eliminating spin and crystal symmetry
restrictions which are usually imposed on the single particle HF orbitals, by
means of employing a rotational invariant formulation of the HF scheme which
was originally introduced by Dirac. Therefore, it is exemplified how, up to now
being considered strong correlation effects, can be described by improving the
HF solution of the physical systems. In other words, defining the correlation
effects as such ones shown by the physical system and which are not predicted
by the best HF (lowest energy) solution, allows to explain currently assumed as
strong correlation properties, as simple mean field ones. The discussion also
helps to clarify the role of the antiferromagnetism and pseudogaps in the
physics of the HTSC materials and indicates a promising way to start
conciliating the Mott and Slater pictures for the description of the transition
metal oxides and other strongly correlated electron systems.


title:
Dielectric anomalies induced by different mechanisms in
  Pb(Fe1/2Nb1/2)1-xTixO3 single crystals

abstract:
  We investigated the dielectric properties of Pb(Fe1/2Nb1/2)1-xTixO3 single
crystals below room temperature. Two dielectric anomalies were detected in
sample A while only one was detected in sample B in the temperature range
90~300 K. A Debye-like relaxation with strong frequency dispersion was detected
in both samples. The pre-edge XAFS suggests that this dielectric anomaly is
induced by the hopping conductivity between Fe2+ and Fe3+. The EXAFS results
give us a clear picture of the local structure of iron ions. The weak frequency
dependent dielectric anomaly only observed in sample A is supposed to be due to
the dipole glass behavior.


title: Quantum fluctuations in trapped time-dependent Bose-Einstein condensates

abstract:
  Quantum fluctuations in time-dependent, harmonically-trapped Bose-Einstein
condensates are studied within Bogoliubov theory. An eigenmode expansion of the
linear field operators permits the diagonalization of the Bogoliubov-de Gennes
equation for a stationary condensate. When trap frequency or interaction
strength are varied, the inhomogeneity of the background gives rise to
off-diagonal coupling terms between different modes. This coupling is
negligible for low energies, i.e., in the hydrodynamic regime, and an effective
space-time metric can be introduced. The influence of the inter-mode coupling
will be demonstrated in an example, where I calculate the quasi-particle number
for a quasi-one-dimensional Bose-Einstein condensate subject to an exponential
sweep of interaction strength and trap frequency.


title: Double Schubert polynomials for the classical groups

abstract:
  For each infinite series of the classical Lie groups of type B,C or D, we
introduce a family of polynomials parametrized by the elements of the
corresponding Weyl group of infinite rank. These polynomials represent the
Schubert classes in the equivariant cohomology of the appropriate flag variety.
They satisfy a stability property, and are a natural extension of the (single)
Schubert polynomials of Billey and Haiman, which represent non-equivariant
Schubert classes. They are also positive in a certain sense, and when indexed
by maximal Grassmannian elements, or by the longest element in a finite Weyl
group, these polynomials can be expressed in terms of the factorial analogues
of Schur's Q- or P-functions defined earlier by Ivanov.


title: The pair potential of colloidal stars

abstract:
  We report on the construction of colloidal stars: 1 micrometer polystyrene
beads grafted with a dense brush of 1 micrometer long and 10 nm wide
semi-flexible filamentous viruses. The pair interaction potentials of colloidal
stars are measured using an experimental implementation of umbrella sampling, a
technique originally developed in computer simulations in order to probe rare
events. The influence of ionic strength and grafting density on the interaction
is measured. Good agreements are found between the measured interactions and
theoretical predictions based upon the osmotic pressure of counterions.


title:
A Hartree-Fock approach to La2CuO4 properties: hints for matching the
  Mott and Slater pictures

abstract:
  This is extended version of a previously submitted paper, in which special
solutions of the Hartree-Fock (HF) problem for Coulomb interacting electrons,
being described by a simple model of the Cu-O planes in La2CuO4, are presented.
One of the mean field states obtained, is able to predict some of the basic
properties of this material, such as its insulator character and the
antiferromagnetic order. The natural appearance of pseudogaps in some states of
this compound is also indicated by another of the HF states obtained. These
surprising results follow after eliminating spin and crystal symmetry
restrictions which are usually imposed on the single particle HF orbitals, by
means of employing a rotational invariant formulation of the HF scheme which
was originally introduced by Dirac. Therefore, it is exemplified how, up to now
being considered strong correlation effects, can be described by improving the
HF solution of the physical systems. In other words, defining the correlation
effects as such ones shown by the physical system and which are not predicted
by the best HF (lowest energy) solution, allows to explain currently assumed as
strong correlation properties, as simple mean field ones. The discussion also
helps to clarify the role of the antiferromagnetism and pseudogaps in the
physics of the HTSC materials and indicates a promising way to start
conciliating the Mott and Slater pictures for the description of the transition
metal oxides and other strongly correlated electron systems.


title: Physical Properties of Main-Belt Comet P/2005 U1 (Read)

abstract:
  The main-belt comets occupy dynamically asteroidal orbits in the main
asteroid belt. Here we present physical observations of the second-known member
of this population, P/2005 U1 (Read), which showed vigorous cometary activity
from 2005 October 24 to 2005 December 27. Monte Carlo numerical simulations of
P/Read's dust emission indicate that the coma and tail are optically dominated
by dust particles larger than 10 microns in size with terminal ejection
velocities of 0.2 to 3 m/s. We estimate P/Read's mass loss rate during this
period to be approximately 0.2 kg/s, roughly an order of magnitude larger than
that calculated for 133P/Elst-Pizarro. We also find that emission likely began
at least two months prior to P/Read's discovery, though we note this is a lower
limit and that earlier start times are possible. Optical colors measured for
P/Read while it was active are approximately solar (B-V=0.63+/-0.05,
V-R=0.37+/-0.04, R-I=0.39+/-0.04) but are likely to be dominated by coma
particles. Observations of P/Read in 2007 when it appears largely inactive show
an extremely small nucleus with an absolute magnitude of H_R~20.1+/-0.4,
corresponding to an effective radius of r~0.3 km. P/Read's activity is
consistent with sublimation-driven dust emission and inconsistent with dust
emission due to an impact, though the unusual strength of the 2005 outburst
suggests the possibility that it could have been due to the sublimation of a
freshly-exposed reservoir of volatile material.


title: The Toric Geometry of Triangulated Polygons in Euclidean Space

abstract:
  Speyer and Sturmfels [SpSt] associated Gr\"obner toric degenerations
$\mathrm{Gr}_2(\C^n)^{\tree}$ of $\mathrm{Gr}_2(\C^n)$ to each trivalent tree
$\tree$ with $n$ leaves. These degenerations induce toric degenerations
$M_{\br}^{\tree}$ of $M_{\br}$, the space of $n$ ordered, weighted (by $\br$)
points on the projective line. Our goal in this paper is to give a geometric
(Euclidean polygon) description of the toric fibers as stratified symplectic
spaces and describe the action of the compact part of the torus as "bendings of
polygons." We prove the conjecture of Foth and Hu [FH] that the toric fibers
are homeomorphic to the spaces defined by Kamiyama and Yoshida [KY].


title: Gorenstein Semigroup Algebras of Weighted Trees

abstract:
  We classify exactly when the toric algebras $\C[S_{\tree}(\br)]$ are
Gorenstein. These algebras arise as toric deformations of algebras of
invariants of the Cox-Nagata ring of the blow-up of $n-1$ points on
$\mathbb{P}^{n-3}$, or equivalently algebras of the ring of global sections for
the Pl\"ucker embedding of weight varieties of the Grassmanian $Gr_2(\C^n)$,
and algebras of global sections for embeddings of moduli of weighted points on
$\mathbb{P}^1$. As a corollary, we find exactly when these families of rings
are Gorenstein as well.


title:
Very elementary interpretations of the Euler-Mascheroni constant from
  counting divisors in intervals

abstract:
  Theorem 1 Let F:N-->R stand for any function which a) $F$ monotonically
weakly increases; b) $F$ tends to infinity; and c) such that $q/F(q)$ tends to
infinity.
  Let Z_F(q) equal the number of divisors of q less than sqrt{F(q)} minus the
number of divisors of q between sqrt{F(q)} and F(q).
  Then, on the average, Z_F(q) equals Euler's constant
  Theorem 2 Fix a in (0,1). Write A for the average number of divisors of n
that lie in (0,sqrt{a n}) minus the number of that lie in (sqrt{a n},a n)$.
Then A= (sum_{i=1}^{\lceil {1-a}/a \rceil} \frac{1}{i}) - ln(1/a).


title:
Community Structure in Large Networks: Natural Cluster Sizes and the
  Absence of Large Well-Defined Clusters

abstract:
  A large body of work has been devoted to defining and identifying clusters or
communities in social and information networks. We explore from a novel
perspective several questions related to identifying meaningful communities in
large social and information networks, and we come to several striking
conclusions. We employ approximation algorithms for the graph partitioning
problem to characterize as a function of size the statistical and structural
properties of partitions of graphs that could plausibly be interpreted as
communities. In particular, we define the network community profile plot, which
characterizes the "best" possible community--according to the conductance
measure--over a wide range of size scales. We study over 100 large real-world
social and information networks. Our results suggest a significantly more
refined picture of community structure in large networks than has been
appreciated previously. In particular, we observe tight communities that are
barely connected to the rest of the network at very small size scales; and
communities of larger size scales gradually "blend into" the expander-like core
of the network and thus become less "community-like." This behavior is not
explained, even at a qualitative level, by any of the commonly-used network
generation models. Moreover, it is exactly the opposite of what one would
expect based on intuition from expander graphs, low-dimensional or
manifold-like graphs, and from small social networks that have served as
testbeds of community detection algorithms. We have found that a generative
graph model, in which new edges are added via an iterative "forest fire"
burning process, is able to produce graphs exhibiting a network community
profile plot similar to what we observe in our network datasets.


title: Do the fundamental constants change with time ?

abstract:
  Comparisons between the redshifts of spectral lines from
cosmologically-distant galaxies can be used to probe temporal changes in
low-energy fundamental constants like the fine structure constant and the
proton-electron mass ratio. In this article, I review the results from, and the
advantages and disadvantages of, the best techniques using this approach,
before focussing on a new method, based on conjugate satellite OH lines, that
appears to be less affected by systematic effects and hence holds much promise
for the future.


title:
Giant and negative dielectric tunability induced by interfacial
  polarization in Pb(Fe1/2Nb1/2)1-xTixO3 single crystals

abstract:
  The giant and negative dielectric tunability of Pb(Fe1/2Nb1/2)1-xTixO3 single
crystals is reported. A low field of 120 V/cm can induce a great reduction of
the capacitance, and the tunability is larger than 80% in low frequency range
(<1 MHz) at room temperature. This giant tunability is ascribed to the
interfacial polarization at the interface of electrode/sample. A negative
dielectric tunability detected only in the tetragonal sample can be also
attributed to the interfacial polarization. The origin of the giant and
negative tunabilities is discussed with the multipolarization-mechanism model
and equivalent circuit model, respectively.


title: Topological Grand Unification

abstract:
  We propose a new grand unification scenario for ensuring proton stability and
triplet-doublet Higgs mass splitting with the help of topological symmetry and
dynamics.


title:
Electron Transfer from Hydrogen Molecule to Au(111) During Dissociative
  Adsorption: A First-Principles Study

abstract:
  We investigate the electron transfer from a dissociatively adsorbed H2
molecule to a Au(111) surface using the first-principles methods. A fractional
electron transfers from a molecule to a substrate, and potential energy
increases during the process. The initial energy increase coincides with that
of the isolated, separated, and positively charged H2 molecule calculated by
the real-space density functional method. The barrier formation is due to the
destabilization of the molecule induced by the electron transfer. The
electronegativity difference between the adsorbate and the substrate determines
the direction of the electron transfer.


title: Light meson spectrum with $N_f=2+1$ dynamical overlap fermions

abstract:
  We report on a numerical simulation with 2+1 dynamical flavors of overlap
fermions. We calculate pseudo-scalar masses and decay constants on a
$16^3\times 48 \times (0.11 {\rm fm})^4$ lattice at five different up and down
quark masses and two strange quark masses. The lightest pion mass corresponds
to $\approx 310$ MeV. We also study the validity of the chiral perturbation
theory using the results of the numerical simulation with two dynamical flavors
and conclude that the one-loop formulae cannot be directly applied in the
strange quark mass region. We therefore extrapolate our 2+1-flavor results to
the chiral limit by fitting the data to the two-loop formulae of the chiral
perturbation theory.


title:
Pseudomodes as an effective description of memory: Non-Markovian
  dynamics of two-state systems in structured reservoirs

abstract:
  We investigate the non-Markovian dynamics of two-state systems in structured
reservoirs. We establish a connection between two theoretical quantum
approaches, the pseudomodes [B. M. Garraway, Phys. Rev. A 55, 2290 (1997)] and
the recently developed non-Markovian quantum jump method [J. Piilo et al.,
Phys. Rev. Lett. 100, 180402 (2008)]. This connection provides a clear physical
picture of how the structured reservoir affects the system dynamics, indicating
the role of the pseudomodes as an effective description of the environmental
memory.


title: Discriminating dark matter candidates using direct detection

abstract:
  We examine the predictions for both the spin dependent and spin independent
direct detection rates in a variety of new particle physics models with dark
matter candidates. We show that a determination of both spin independent and
spin dependent amplitudes on protons and neutrons can in principle discriminate
different candidates of dark matter up to a few ambiguities. We emphasize the
importance of making measurements with different spin dependent sensitive
detector materials and the need for significant improvement of the detector
sensitivities. Scenarii where exchange of new coloured particles contributes
significantly to the elastic scattering cross sections are often the most
difficult to identify, the LHC should give an indication whether such scenarii
are relevant for direct detection.


title:
The Sectional Curvature of the Tangent Bundles with General Natural
  Lifted Metrics

abstract:
  We study some properties of the tangent bundles with metrics of general
natural lifted type. We consider a Riemannian manifold $(M,g)$ and we find the
conditions under which the Riemannian manifold $(TM,G)$, where $TM$ is the
tangent bundle of $M$ and $G$ is the general natural lifted metric of $g$, has
constant sectional curvature.


title: Superconductivity at 11.3 K induced by cobalt doping in CeOFeAs

abstract:
  Pure phases of a new oxyarsenide superconductor of the nominal composition
CeOFe0.9Co0.1As was successfully synthesized by solid state reaction in sealed
silica ampoules at 1180 C. It crystallizes in the layered tetragonal ZrCuSiAs
type structure (sp gp P4/nmm) with lattice parameter of a = 3.9918(5) angstrom
and c = 8.603(1) angstrom. A sharp superconducting transition is observed at
11.31 K with an upper critical field of 45.22 T at ambient pressure. The
superconducting transition temperature is drastically lowered (~ 4.5, 4.9 K) on
increasing the concentration (x = 0.15, 0.2) of cobalt.


title:
On the behaviour of the Atiyah Conjecture under taking subgroups and
  under taking quotients with finite kernel

abstract:
  We state and prove a condition under which the strong Atiyah Conjecture
carries over to subgroups. Moreover, we show that if a group satisfies the
(strong) Atiyah Conjecture then any quotient with finite kernel does.


title: Cotangent Bundles with General Natural Kahler Structures

abstract:
  We study the conditions under which an almost Hermitian structure $(G,J)$ of
general natural lift type on the cotangent bundle $T^*M$ of a Riemannian
manifold $(M,g)$ is K\" ahlerian. First, we obtain the algebraic conditions
under which the manifold $(T^*M,G,J)$ is almost Hermitian. Next we get the
integrability conditions for the almost complex structure $J$, then the
conditions under which the associated 2-form is closed. The manifold
$(T^*M,G,J)$ is K\" ahlerian iff it is almost Kahlerian and the almost complex
structure $J$ is integrable. It follows that the family of Kahlerian structures
of above type on $T^*M$ depends on three essential parameters (one is a certain
proportionality factor, the other two are parameters involved in the definition
of $J$).


title: Characterizations of the medium in jet quenching calculations

abstract:
  The modification of hard jets in dense matter has so far been described by
four different formalisms based on perturbative QCD (pQCD). In these
proceedings, we compare the various approximations made in these different
schemes, especially those regarding the structure of the medium through which
jets propagate. Following this, we highlight some of the major differences in
the various physical processes contained in the different approaches.


title:
Demonstration of Time-Reversal in Indoor Ultra-Wideband Communication:
  Time Domain Measurement

abstract:
  Using time domain measurements, we assess the feasibility of time-reversal
technique in ultra-wideband (UWB) communication. A typical indoor propagation
channel is selected for the exploration. The channel response between receive
and transmit antenna pairs is measured using time domain equipments which
include an arbitrary wave generator (AWG) and a digital storage oscilloscope
(DSO). The time-reversed version of the channel response is constructed with
AWG and re-transmitted in the channel. The equivalent time reversed channel
response is recorded. The properties of the time reversal technique in the line
of sight (LOS) co-polar and cross-polar scenarios are measured.


title:
Roles of Direct Break-up Reaction on Neutrino Scattering off $^{12}$C
  near Nucleon Threshold Region

abstract:
  Neutrino (antineutrino) scattering off $^{12}$C is one of various important
key reactions for $\nu$-process in the nucleosysnthesis of light nuclei. Most
of neutrino-nucleus scattering are considered through indirect processes within
the energy range from a few to tens of MeV. Target nuclei are excited by
incident neutrino (antineutrino) through various transitions, and subsequently
decay into other nuclei with emitting particles. But, direct processes are also
feasible, in which incident neutrino (antineutrino) strips directly one nucleon
from target nuclei. Consequently, direct processes may affect abundances of
$^{11}$C and $^{11}$B additionally to indirect processes. We investigate direct
neutrino (antineutrino) quasi-elastic scattering off $^{12}$C around the energy
region liberating one nucleon and discuss implications of direct processes in
the nucleosynthesis. The direct processes might be comparable to the indirect
processes if the final state interaction is taken into account.


title: Verhulst model with Levy white noise excitation

abstract:
  The transient dynamics of the Verhulst model perturbed by arbitrary
non-Gaussian white noise is investigated. Based on the infinitely divisible
distribution of the Levy process we study the nonlinear relaxation of the
population density for three cases of white non-Gaussian noise: (i) shot noise,
(ii) noise with a probability density of increments expressed in terms of Gamma
function, and (iii) Cauchy stable noise. We obtain exact results for the
probability distribution of the population density in all cases, and for Cauchy
stable noise the exact expression of the nonlinear relaxation time is derived.
Moreover starting from an initial delta function distribution, we find a
transition induced by the multiplicative Levy noise, from a trimodal
probability distribution to a bimodal probability distribution in asymptotics.
Finally we find a nonmonotonic behavior of the nonlinear relaxation time as a
function of the Cauchy stable noise intensity.


title:
Mixed spin-1/2 and spin-1 Ising model with uniaxial and biaxial
  single-ion anisotropy on Bethe lattice

abstract:
  The mixed spin-1/2 and spin-1 Ising model on the Bethe lattice with both
uniaxial as well as biaxial single-ion anisotropy terms is exactly solved by
combining star-triangle and triangle-star mapping transformations with exact
recursion relations. Magnetic properties (magnetization, phase diagrams and
compensation phenomenon) are investigated in detail. The particular attention
is focused on the effect of uniaxial and biaxial single-ion anisotropies that
basically influence the magnetic behavior of the spin-1 atoms.


title: Postulation of general quartuple fat point schemes in P^3

abstract:
  We study the postulation of a general union $Y$ of double, triple, and
quartuple points of $\mathbb{P}^3$. We prove that $Y$ has the expected
postulation in degree $d\ge 41$, using the Horace differential lemma. We also
discuss the cases of low degree with the aid of computer algebra.


title: AGN accretion disks as spatially resolved by polarimetry

abstract:
  A crucial difficulty in understanding the nature of the putative accretion
disk in AGNs is that some of its key intrinsic spectral signatures cannot be
observed directly. The strong emissions from the broad-line region (BLR) and
the obscuring torus, which are generally yet to be spatially resolved,
essentially 'bury' such signatures. Here we argue that we can actually isolate
the disk emission spectrum by using optical and near-infrared polarization of
quasars and uncover the important spectral signatures. In these quasars, the
polarization is considered to originate from electron scattering interior to
the BLR, so that the polarized flux shows the disk spectrum with all the
emissions from the BLR and torus eliminated. The polarized flux observations
have now revealed a Balmer edge feature in absorption and a blue near-infrared
spectral shape consistent with a specific and robust theoretical prediction.
These results critically verify the long-standing picture of an optically thick
and locally heated disk in AGNs.


title:
A rigorous lower confidence bound for the expectation of a positive
  random variable

abstract:
  Given an IID sample from a positive distribution, we provide a method for
constructing rigorous finite sample lower confidence bounds for the expectation
of the distribution. The method is based on constructing rigorous confidence
regions for the cdf of the distribution. We provide some analysis of the
asymptotical behavior of the rigorous LCBs. We apply the method to obtain an
LCB for a particular, controversial, empirical data set, where the validity of
standard methods has been called into question.


title:
IRC-10443: a multi-periodic SRa variable and the nature of long
  secondary periods in AGB stars

abstract:
  We obtained BVIc photometry of IRC-10443 on 85 different nights distributed
over two years, and in addition low resolution absolute spectro- photometry and
high resolution Echelle spectroscopy. Our data show that IRC-10443, which was
never studied before in any detail, is a SRa variable, characterized by
Delta(B)=1.27, Delta(V)=1.14 and Delta(I)=0.70 mag amplitudes and mean values
<B>=13.75, <V>=11.33 and <Ic>=6.18 mag. Two strong periodicities are
simultaneously present: a principal one of 85.5 (+/-0.2) days, and a secondary
one of 620 (+/-15) days, both sinusoidal in shape, and with semi-amplitudes
Delta(V)=0.41 and 0.20 mag, respectively. IRC-10443 turns out to be a M7III
star, with a mean heliocentric radial velocity -28 km/s and reddened by
E(B-V)=0.87, a third of which of circumstellar origin. The same 0.5 kpc
distance is derived from application of the appropriate period-luminosity
relations to both the principal and the secondary periods. The long secondary
period causes a sinusoidal variation in color of 0.13 mag semi-amplitude in
V-Ic, with IRC-10443 being bluest at maximum and reddest at minimum, and with
associated changes in effective temperature and radius of 85 K and 6%,
respectively. This behavior of colors argues in favor of a pulsation nature for
the still mysterious long secondary periods in AGB stars.


title: Co-evolution of density and topology in a simple model of city formation

abstract:
  We study the influence that population density and the road network have on
each others' growth and evolution. We use a simple model of formation and
evolution of city roads which reproduces the most important empirical features
of street networks in cities. Within this framework, we explicitely introduce
the topology of the road network and analyze how it evolves and interact with
the evolution of population density. We show that accessibility issues -pushing
individuals to get closer to high centrality nodes- lead to high density
regions and the appearance of densely populated centers. In particular, this
model reproduces the empirical fact that the density profile decreases
exponentially from a core district. In this simplified model, the size of the
core district depends on the relative importance of transportation and rent
costs.


title: Pressure-induced superconductivity in Iron pnictide compound SrFe2As2

abstract:
  Electrical resistivity under high pressure have been measured on nominally
pure SrFe2As2 up to 14 GPa. The resistivity drop appeared with increasing
pressure, and we clearly observed zero resistivity. The maximum of
superconducting transition temperature (Tc) is 38 K. The value is corresponding
to the one of optimally doping AFe2As2 (A=Sr, Ba) system with K+ ions at the
A2+ site.


title: Long-time behaviour of discretizations of the simple pendulum equation

abstract:
  We compare the performance of several discretizations of the simple pendulum
equation in a series of numerical experiments. The stress is put on the
long-time behaviour. We choose for the comparison numerical schemes which
preserve the qualitative features of solutions (like periodicity). All these
schemes are either symplectic maps or integrable (preserving the energy
integral) maps, or both. We describe and explain systematic errors (produced by
any method) in numerical computations of the period and the amplitude of
oscillations. We propose a new numerical scheme which is a modification of the
discrete gradient method. This discretization preserves (almost exactly) the
period of small oscillations for any time step.


title: AdS_3 x S^3 x S^3 x S^1 Solutions of Type IIB String Theory

abstract:
  We analyse a recently constructed class of local solutions of type IIB
supergravity that consist of a warped product of AdS_3 with a seven-dimensional
internal space. In one duality frame the only other non-vanishing fields are
the NS three-form and the dilaton. We analyse in detail how these local
solutions can be extended to globally well-defined solutions of type IIB string
theory, with the internal space having topology S^3 x S^3 x S^1 and with
properly quantised three-form flux.


title: Harmonic almost contact structures via the intrinsic torsion

abstract:
  We go further on the study of harmonicity for almost contact metric
structures already initiated by Vergara-Diaz and Wood. By using the intrinsic
torsion, we characterise harmonic almost contact metric structures in several
equivalent ways and show conditions relating harmonicity and classes of almost
contact metric structures. Additionally, we study the harmonicity of such
structures as a map into the quotient bundle of the oriented orthonormal frames
by the action of the structural group U(n)x1. Finally, by using a Bochner type
formula proved by Bor and Hernandez Lamoneda, we display some examples which
give the absolute minimum for the energy.


title:
Numerical Solution of an Inverse Problem in Size-Structured Population
  Dynamics

abstract:
  We consider a size-structured model for cell division and address the
question of determining the division (birth) rate from the measured stable size
distribution of the population. We propose a new regularization technique based
on a filtering approach. We prove convergence of the algorithm and validate the
theoretical results by implementing numerical simulations, based on classical
techniques. We compare the results for direct and inverse problems, for the
filtering method and for the quasi-reversibility method proposed in
[Perthame-Zubelli].


title: On Alexander Polynomials of Certain (2,5) Torus Curves

abstract:
  In this paper, we compute Alexander polynomials of a torus curve C of type
(2, 5), C : f(x, y) = f_2(x, y)^5 + f_5(x, y)^2 = 0, under the assumption that
the origin O is the unique inner singularity and f2 = 0 is an irreducible
conic. We show that the Alexander polynomial remains the same with that of a
generic torus curve as long as C is irreducible.


title: Sequential pivotal mechanisms for public project problems

abstract:
  It is well-known that for several natural decision problems no budget
balanced Groves mechanisms exist. This has motivated recent research on
designing variants of feasible Groves mechanisms (termed as `redistribution of
VCG (Vickrey-Clarke-Groves) payments') that generate reduced deficit. With this
in mind, we study sequential mechanisms and consider optimal strategies that
could reduce the deficit resulting under the simultaneous mechanism. We show
that such strategies exist for the sequential pivotal mechanism of the
well-known public project problem. We also exhibit an optimal strategy with the
property that a maximal social welfare is generated when each player follows
it. Finally, we show that these strategies can be achieved by an implementation
in Nash equilibrium.


title:
Kinetics of Phase Separation in Thin Films: Lattice versus Continuum
  Models for Solid Binary Mixtures

abstract:
  A description of phase separation kinetics for solid binary (A,B) mixtures in
thin film geometry based on the Kawasaki spin-exchange kinetic Ising model is
presented in a discrete lattice molecular field formulation. It is shown that
the model describes the interplay of wetting layer formation and lateral phase
separation, which leads to a characteristic domain size $\ell(t)$ in the
directions parallel to the confining walls that grows according to the
Lifshitz-Slyozov $t^{1/3}$ law with time $t$ after the quench. Near the
critical point of the model, the description is shown to be equivalent to the
standard treatments based on Ginzburg-Landau models. Unlike the latter, the
present treatment is reliable also at temperatures far below criticality, where
the correlation length in the bulk is only of the order of a lattice spacing,
and steep concentration variations may occur near the walls, invalidating the
gradient square approximation. A further merit is that the relation to the
interaction parameters in the bulk and at the walls is always transparent, and
the correct free energy at low temperatures is consistent with the time
evolution by construction.


title:
High mass X-ray binary SXP18.3 undergoes the longest Type II outburst
  ever seen in the Small Magellanic Cloud

abstract:
  On 30th August 2006 SXP18.3 a high mass X-ray binary (HMXB) in the Small
Magellanic Cloud (SMC) with an 18.3s pulse period was observed by Rossi X-ray
Timing Explorer (RXTE). The source was seen continuously for the following 36
weeks. This is the longest Type II outburst ever seen from a HMXB in the SMC.
During the outburst SXP18.3 was located from serendipitous XMM-Newton
observations. The identification of the optical counterpart has allowed SXP18.3
to be classified as a Be/X-ray binary. This paper will report on the analysis
of the optical and weekly RXTE X-ray data that span the last 10 years. The
extreme length of this outburst has for the first time enabled us to perform an
extensive study of the pulse timing of an SMC Be/X-ray binary. We present a
possible full orbital solution from the pulse timing data. An orbital period of
17.79d is proposed from the analysis of the OGLE III light curve placing
SXP18.3 on the boundary of known sources in the Corbet diagram.


title: Discrete Mechanics and Optimal Control: an Analysis

abstract:
  The optimal control of a mechanical system is of crucial importance in many
realms. Typical examples are the determination of a time-minimal path in
vehicle dynamics, a minimal energy trajectory in space mission design, or
optimal motion sequences in robotics and biomechanics. In most cases, some sort
of discretization of the original, infinite-dimensional optimization problem
has to be performed in order to make the problem amenable to computations. The
approach proposed in this paper is to directly discretize the variational
description of the system's motion. The resulting optimization algorithm lets
the discrete solution directly inherit characteristic structural properties
from the continuous one like symmetries and integrals of the motion. We show
that the DMOC approach is equivalent to a finite difference discretization of
Hamilton's equations by a symplectic partitioned Runge-Kutta scheme and employ
this fact in order to give a proof of convergence.
  The numerical performance of DMOC and its relationship to other existing
optimal control methods are investigated.


title:
Mean-field limit and Semiclassical Expansion of a Quantum Particle
  System

abstract:
  We consider a quantum system constituted by $N$ identical particles
interacting by means of a mean-field Hamiltonian. It is well known that, in the
limit $N\to\infty$, the one-particle state obeys to the Hartree equation.
Moreover, propagation of chaos holds. In this paper, we take care of the
$\hbar$ dependence by considering the semiclassical expansion of the
$N$-particle system. We prove that each term of the expansion agrees, in the
limit $N\to\infty$, with the corresponding one associated with the Hartree
equation. We work in the classical phase space by using the Wigner formalism,
which seems to be the most appropriate for the present problem.


title:
Phase coherent control in electron-argon scattering in a bichromatic
  laser field

abstract:
  We study the elastic scattering of atomic argon by a electron in the presence
of a bichromatic laser field. The numerical calculation is done in the first
Born approximation (FBA) for a simple screening electric potential. With the
help of numerical results we explore the dependence of the differential cross
sections (DCS) on the relative phase between the two components of the
radiation field and discuss the influence of the number of photons exchanged on
the phase-dependence effect. Moreover, we also discuss the numerical results of
the DCS for different scattering angles and impact energies.


title:
Determination of the Strong Coupling \boldmath{\as} from hadronic Event
  Shapes and NNLO QCD predictions using JADE Data

abstract:
  Event Shape Data from $e^+e^-$ annihilation into hadrons collected by the
JADE experiment at centre-of-mass energies between 14 GeV and 44 GeV are used
to determine the strong coupling $\alpha_S$. QCD predictions complete to
next-to-next-to-leading order (NNLO), alternatively combined with resummed
next-to-leading-log-approximation (NNLO+NLLA) calculations, are used. The
combined value from six different event shape observables at the six JADE
centre-of-mass energies using the NNLO calculations is
  $\alpha_S(M_Z)$= 0.1210 +/- 0.0007(stat.) +/- 0.0021(expt.) +/- 0.0044(had.)
+/- 0.0036(theo.) and with the NNLO+NLLA calculations the combined value is
$\alpha_S$= 0.1172 +/- 0.0006(stat.) +/- 0.0020(expt.) +/- 0.0035(had.) +/-
0.0030(theo.) . The stability of the NNLO and NNLO+NLLA results with respect to
missing higher order contributions, studied by variations of the
renormalisation scale, is improved compared to previous results obtained with
NLO+NLLA or with NLO predictions only. The observed energy dependence of
$\alpha_S$ agrees with the QCD prediction of asymptotic freedom and excludes
absence of running with 99% confidence level.


title:
Semi-empirical formulation of multiple scattering for Gaussian beam
  model of heavy charged particles stopping in tissue-like matter

abstract:
  Dose calculation for radiotherapy with protons and heavier ions deals with a
large volume of path integrals involving a scattering power of body tissue.
This work provides a simple model for such demanding applications. There is an
approximate linearity between RMS end-point displacement and range of incident
particles in water, empirically found in measurements and detailed
calculations. This fact was translated into a simple linear formula, from which
the scattering power that is only inversely proportional to residual range was
derived. The simplicity enabled analytical formulation for ions stopping in
water, which was designed to be equivalent with the extended Highland model and
agreed with measurements within 2% or 0.02 cm in RMS displacement. The
simplicity will also improve the efficiency of numerical path integrals in the
presence of heterogeneity.


title: A dichotomy for Borel functions

abstract:
  The dichotomy discovered by Solecki in \cite{Sol} states that any Baire class
1 function is either $\sigma$-continuous or "includes" the Pawlikowski function
$P$. The aim of this paper is to give an argument which is simpler than the
original proof of Solecki and gives a stronger statement: a dichotomy for all
Borel functions.


title: Aging and effective temperatures near a critical point

abstract:
  The orientation fluctuations of the director of a liquid crystal(LC) are
measured after a quench near the Fr\'eedericksz transition, which is a second
order transition driven by an electric field. We report experimental evidence
that, because of the critical slowing down, the LC presents, after the quench,
several properties of an aging system, such as power law scaling versus time of
correlation and response functions. During this slow relaxation, a well defined
effective temperature, much larger than the heat bath temperature, can be
measured using the fluctuation dissipation relation.


title: Disk masses in the embedded and T Tauri phases of stellar evolution

abstract:
  (Abridged). Motivated by a growing concern that masses of circumstellar disks
may have been systematically underestimated by conventional observational
methods, we present a numerical hydrodynamics study of time-averaged disk
masses (<M_d>) around low-mass Class 0, Class I, and Class II objects. Mean
disk masses (\overline{M}_d}) are then calculated by weighting the
time-averaged disk masses according to the corresponding stellar masses using a
power-law weight function with a slope typical for the Kroupa initial mass
function of stars. Two distinct types of disks are considered: self-gravitating
disks, in which mass and angular momentum are redistributed exclusively by
gravitational torques, and viscous disks, in which both the gravitational and
viscous torques are at work. We find that self-gravitating disks have mean
masses that are slowly increasing along the sequence of stellar evolution
phases. More specifically, Class 0/I/II self-gravitating disks have mean masses
\overline{M}_d=0.09, 0.10, and 0.12 M_sun, respectively. Viscous disks have
similar mean masses (\overline{M}_d=0.10-0.11 M_sun) in the Class 0/I phases
but almost a factor of 2 lower mean mass in the Class II phase
(\overline{M}_d,CII=0.06 M_sun). In each evolution phase, time-averaged disk
masses show a large scatter around the mean value. Our obtained mean disk
masses are larger than those recently derived by Andrews & Williams and Brown
et al., regardless of the physical mechanisms of mass transport in the disk.


title:
Neutrino alert systems for Gamma Ray Bursts and Transient astronomical
  Sources

abstract:
  GRBs are the most energetic events in the Universe, associated with the death
of massive stars (core-collapse supernovae) or the merging of neutron stars or
black holes. Discovered in the early 1970s, their cosmological origin was
demonstrated only in 1997, when the first distance was measured. Theoretical
models predict that the very energetic processes at work in GRBs accelerate
charged particles to such energies that they could contribute to the observed
high energy neutrinos.
  These processes will be discussed and the observational consequences, in
particular for current and forthcoming neutrino telescopes, presented.


title: Large-angle hadron production cross-sections for the neutrino factory

abstract:
  Precise measurements of neutrino oscillation parameters and of
neutrino-nucleon cross-sections require a good understanding of neutrino beams:
flux as a function of energy, transverse beam profile, and flavour composition.
For this, hadron production spectra in proton-nucleus collisions are essential.
We report on double-differential inclusive large-angle cross-sections of the
production of secondary protons and charged pions, in the interactions with a
5% lambda thick stationary beryllium target, of proton and pion beams with
momentum from 3 GeV/c to 15 GeV/c. Our results show cross-sections reported by
the 'HARP Collaboration' to be wrong by factors of up to two.


title: Comparison of Geant4 hadron generators with data: a critical appraisal

abstract:
  Hadron generation models are indispensable for the simulation and calibration
of particle physics detectors. The models used by the Geant4 simulation tool
kit are compared with inclusive spectra of secondary protons and pions from the
interactions with beryllium nuclei of +8.9 GeV/c protons and pions, and of -8.0
GeV/c pions. We report on significant disagreements between data and model
predictions especially in the polar-angle distributions of secondary protons
and pions.


title: Is the Scaling of Supersonic Turbulence Universal?

abstract:
  The statistical properties of turbulence are considered to be universal at
sufficiently small length scales, i. e., independent of boundary conditions and
large-scale forces acting on the fluid. Analyzing data from numerical
simulations of supersonic turbulent flow driven by external forcing, we
demonstrate that this is not generally true for the two-point velocity
statistics of compressible turbulence. However, a reformulation of the refined
similarity hypothesis in terms of the mass-weighted velocity rho^(1/3)v yields
scaling laws that are almost insensitive to the forcing. The results imply that
the most intermittent dissipative structures are shocks closely following the
scaling of Burgers turbulence.


title: A critical appraisal of the LSND anomaly

abstract:
  The so-called 'LSND anomaly', a 3.8 sigma excess of anti-nu_e events
interpreted as originating from anti-nu_mu -> anti-nu_e oscillation, gave rise
to many theoretical speculations. The MiniBooNE Collaboration reported
inconsistency of this interpretation with the findings from their search for
nu_mu -> nu_e oscillations. Yet the origin of the LSND anomaly was never
clarified. A critical issue is the prediction of the background anti-nu_e flux
that was used in the analysis of the LSND experiment. For this, decisive input
comes from pion spectra measured with the HARP large-angle spectrometer under
conditions that closely resemble the LSND situation: a proton beam with 800 MeV
kinetic energy hitting a water target.


title: Entanglement of Gaussian states using beam splitter

abstract:
  We study an experimental scheme to generate Gaussian two-mode entangled
states via beam splitter. Specifically, we consider a nonclassical Gaussian
state (squeezed state) and a thermal state as two input modes, and evaluate the
degree of entanglement at the output. Experimental conditions to generate
entangled outputs are completely identified and the critical thermal noise to
destroy entanglement is analytically obtained. By doing so, we discuss the
possibility to link the resistance to noise in entanglement generation with the
degree of single-mode nonclassicality.


title:
Coherent photon-photon interactions in very peripheral relativistic
  heavy ion collisions

abstract:
  Heavy ions at high velocities provide very strong electromagnetic fields for
a very short time. The main characteristics of ultraperipheral relativistic
heavy ion collisions are reviewed, characteristic parameters are identified.
The main interest in ultraperipheral heavy ion collisions at relativistic ion
colliders like the LHC is the interactions of very high energy (equivalent)
photons with the countermoving (equivalent) photons and hadrons (protons/ions).
The physics of these interactions is quite different from and complementary to
the physics of the strong fields achieved with current and future lasers.


title: The telescope conjecture for hereditary rings via Ext-orthogonal pairs

abstract:
  For the module category of a hereditary ring, the Ext-orthogonal pairs of
subcategories are studied. For each Ext-orthogonal pair that is generated by a
single module, a 5-term exact sequence is constructed. The pairs of finite type
are characterized and two consequences for the class of hereditary rings are
established: homological epimorphisms and universal localizations coincide, and
the telescope conjecture for the derived category holds true. However, we
present examples showing that neither of these two statements is true in
general for rings of global dimension 2.


title: Updated Axion CDM energy density

abstract:
  We update cosmological bound on axion model. The contribution from the
anharmonic effect and the newly introduced initial overshoot correction are
considered. We present an explicit formula for the axion relic density in terms
of the QCD scale Lambda_{QCD}, the current quark masses m_q's and the
Peccei-Quinn scale F_a, including firstly introduced 1.85 factor which is from
the initial overshoot.


title:
NMR relaxation rate and dynamical structure factors in nematic and
  multipolar liquids of frustrated spin chains under magnetic fields

abstract:
  Recently, it has been shown that spin nematic (quadrupolar) or higher
multipolar correlation functions exhibit a quasi long-range order in the wide
region of the field-induced Tomonaga-Luttinger-liquid (TLL) phase in spin-1/2
zigzag chains. In this paper, we point out that the temperature dependence of
the NMR relaxation rate 1/T_1 in these multipolar TLLs is qualitatively
different from that in more conventional TLLs of one-dimensional quantum
magnets (e.g., the spin-1/2 Heisenberg chain); 1/T_1 decreases with lowering
temperature in multipolar TLL. We also discuss low-energy features in spin
dynamical structure factors which are characteristic of the multipolar TLL
phases.