title: Global Symplectic Uncertainty Propagation on SO(3)

abstract:
  This paper introduces a global uncertainty propagation scheme for rigid body
dynamics, through a combination of numerical parametric uncertainty techniques,
noncommutative harmonic analysis, and geometric numerical integration. This
method is distinguished from prior approaches, as it allows one to consider
probability densities that are global, and are not supported on only a single
coordinate chart on the manifold. The use of Lie group variational integrators,
that are symplectic and stay on the Lie group, as the underlying numerical
propagator ensures that the advected probability densities respect the
geometric properties of uncertainty propagation in Hamiltonian systems, which
arise as consequence of the Gromov nonsqueezing theorem from symplectic
geometry. We also describe how the global uncertainty propagation scheme can be
applied to the problem of global attitude estimation.


title:
Adsorption of gas molecules on graphene nanoribbons and its implication
  for nano-scale molecule sensor

abstract:
  We have studied the adsorption of gas molecules (CO, NO, NO2, O2, N2, CO2,
and NH3) on graphene nanoribbons (GNRs) using first principles methods. The
adsorption geometries, adsorption energies, charge transfer, and electronic
band structures are obtained. We find that the electronic and transport
properties of the GNR with armchair-shaped edges are sensitive to the
adsorption of NH3 and the system exhibits n type semiconducting behavior after
NH3 adsorption. Other gas molecules have little effect on modifying the
conductance of GNRs. Quantum transport calculations further indicate that NH3
molecules can be detected out of these gas molecules by GNR based sensor.


title: Quantum Critical Paraelectrics and the Casimir Effect in Time

abstract:
  We study the quantum paraelectric-ferroelectric transition near a quantum
critical point, emphasizing the role of temperature as a "finite size effect"
in time. The influence of temperature near quantum criticality may thus be
likened to a temporal Casimir effect. The resulting finite-size scaling
approach yields $\frac{1}{T^2}$ behavior of the paraelectric susceptibility
($\chi$) and the scaling form $\chi(\omega,T) = \frac{1}{\omega^2}
F(\frac{\omega}{T})$, recovering results previously found by more technical
methods. We use a Gaussian theory to illustrate how these
temperature-dependences emerge from a microscopic approach; we characterize the
classical-quantum crossover in $\chi$, and the resulting phase diagram is
presented. We also show that coupling to an acoustic phonon at low temperatures
($T$) is relevant and influences the transition line, possibly resulting in a
reentrant quantum ferroelectric phase. Observable consequences of our approach
for measurements on specific paraelectric materials at low temperatures are
discussed.


title: The fundamental parameters of the roAp star alpha Circini

abstract:
  We have used the Sydney University Stellar Interferometer (SUSI) to measure
the angular diameter of alpha Cir. This is the first detailed interferometric
study of a rapidly oscillating A (roAp) star, alpha Cir being the brightest
member of its class. We used the new and more accurate Hipparcos parallax to
determine the radius to be 1.967+-0.066 Rs. We have constrained the bolometric
flux from calibrated spectra to determine an effective temperature of 7420+-170
K. This is the first direct determination of the temperature of an roAp star.
Our temperature is at the low end of previous estimates, which span over 1000 K
and were based on either photometric indices or spectroscopic methods. In
addition, we have analysed two high-quality spectra of alpha Cir, obtained at
different rotational phases and we find evidence for the presence of spots. In
both spectra we find nearly solar abundances of C, O, Si, Ca and Fe, high
abundance of Cr and Mn, while Co, Y, Nd and Eu are overabundant by about 1 dex.
The results reported here provide important observational constraints for
future studies of the atmospheric structure and pulsation of alpha Cir.


title: Derived Arithmetic Fuchsian Groups of Genus Two

abstract:
  We classify all torsion-free derived arithmetic Fuchsian groups of genus two
by commensurability class. In particular, we show that there exist no such
groups arising from quaternion algebras over number fields of degree greater
than 5. We also prove some results on the existence and form of maximal orders
for a class of quaternion algebras related to these groups. Using these results
in conjunction with a computer program, one can determine an explicit set of
generators for each derived arithmetic Fuchsian group containing a torsion-free
subgroup of genus two. We show this for a number of examples.


title:
Integrity-Enhancing Replica Coordination for Byzantine Fault Tolerant
  Systems

abstract:
  Strong replica consistency is often achieved by writing deterministic
applications, or by using a variety of mechanisms to render replicas
deterministic. There exists a large body of work on how to render replicas
deterministic under the benign fault model. However, when replicas can be
subject to malicious faults, most of the previous work is no longer effective.
Furthermore, the determinism of the replicas is often considered harmful from
the security perspective and for many applications, their integrity strongly
depends on the randomness of some of their internal operations. This calls for
new approaches towards achieving replica consistency while preserving the
replica randomness. In this paper, we present two such approaches. One is based
on Byzantine agreement and the other on threshold coin-tossing. Each approach
has its strength and weaknesses. We compare the performance of the two
approaches and outline their respective best use scenarios.


title:
Proactive Service Migration for Long-Running Byzantine Fault Tolerant
  Systems

abstract:
  In this paper, we describe a novel proactive recovery scheme based on service
migration for long-running Byzantine fault tolerant systems. Proactive recovery
is an essential method for ensuring long term reliability of fault tolerant
systems that are under continuous threats from malicious adversaries. The
primary benefit of our proactive recovery scheme is a reduced vulnerability
window. This is achieved by removing the time-consuming reboot step from the
critical path of proactive recovery. Our migration-based proactive recovery is
coordinated among the replicas, therefore, it can automatically adjust to
different system loads and avoid the problem of excessive concurrent proactive
recoveries that may occur in previous work with fixed watchdog timeouts.
Moreover, the fast proactive recovery also significantly improves the system
availability in the presence of faults.


title: Birkhoff spectra for one-dimensional maps with some hyperbolicity

abstract:
  We study the multifractal analysis for smooth dynamical systems in dimension
one. It is characterized the Hausdorff dimension of the level set obtained from
the Birkhoff averages of a continuous function by the local dimensions of
hyperbolic measures for a topologically mixing $C^2$ map modelled by an
abstract dynamical system. A characterization which corresponds to above is
also given for the ergodic basins of invariant probability measures. And it is
shown that the complement of the set of quasi-regular points carries full
Hausdorff dimension.


title:
Self-Induced Fractional Fourier Transform and Revivable Higher Order
  Spatial Solitons in Strongly Nonlocal Nonlinear Media

abstract:
  The fractional Fourier transform (FRFT) naturally exists in the strongly
nonlocal nonlinear (SNN) media and the propagation of optical beams in SNN
media can be simply regarded as a self-induced FRFT. Through FRFT technic the
evolution of fields in SNN media can be conveniently dealt with and an
arbitrary square-integrable input field presents generally as a revivable
higher order spatial soliton which reconstructs its profile periodically after
every 4 times of Fourier transforms. The self-induced FRFT would illuminate the
prospect of the SNN media in new applications such as continuously tunable
nonlinearity-induced FRFT devices.


title: Entanglement and Berry Phase in Two Interacting Qubits

abstract:
  Entanglement and Berry phase are investigated in two interacting qubit
systems. The XXZ spin interaction model with a slowly rotating magnetic field
is employed for the interaction between the two qubits. We show how the
anisotropy of interaction reveals unique relations between the Berry phases and
the entanglements for the eigenstates of the system.


title: Equality of pressures for diffeomorphisms preserving hyperbolic measures

abstract:
  For a diffeomorphism which preserves a hyperbolic measure the potential
$\phi^u=-\log|{\rm Jac} df|_{E^u}|$ is studied. Various types of pressure of
$\phi^u$ are introduced. It is shown that these pressures satisfy a
corresponding variational principle.


title: Plagiarism: Words and ideas

abstract:
  Plagiarism is a crime against academy. It deceives readers, hurts plagiarized
authors, and gets the plagiarist undeserved benefits. However, even though
these arguments do show that copying other people's intellectual contribution
is wrong, they do not apply to the copying of words. Copying a few sentences
that contain no original idea (e.g. in the introduction) is of marginal
importance compared to stealing the ideas of others. The two must be clearly
distinguished, and the 'plagiarism' label should not be used for deeds which
are very different in nature and importance.
  Keywords: academic dishonesty; academic integrity; academic misconduct;
cheating; copyright infringement; ethics; intellectual property; research
misconduct


title: Dilepton from Quark-Gluon Plasma and Quark-Hadron Phase Transition

abstract:
  A model of statistical quark-gluon plasma formation is considered.We look the
dilepton production at critical temperature $T_{c}\sim170 Mev $ and completely
free out temperature $T=150 MeV$ with the initial temperature as $T_{0}=570,400
(250) MeV$. Now we consider that quark mass is depending on the coupling value
through parameterisation factor of the fireball formation and temperature. The
rate of production is shown for invariant mass $M$ at the particular value of $
E=2.0,3.0 GeV$.It shows the significant production of leptons in this process
for small value of invariant mass. However, the quark-hadron phase transition
is a very weakly changed in the entropy of the system during this process of
hadronisation.


title:
Time Variability of the Neutral Iron Lines from the Sgr B2 Region and
  its Implication of a Past Outburst of Sgr A$^*$

abstract:
  We investigate long-term X-ray behaviors from the Sgr B2 complex using
archival data of the X-ray satellites Suzaku, XMM-Newton, Chandra and ASCA. The
observed region of the Sgr B2 complex includes two prominent spots in the Fe I
K-$\alpha$ line at 6.40 keV, a giant molecular cloud M 0.66$-$0.02 known as the
``Sgr B2 cloud'' and an unusual X-ray source G 0.570$-$0.018. Although these
6.40 keV spots have spatial extensions of a few pc scale, the morphology and
flux of the 6.40 keV line has been time variable for 10 years, in contrast to
the constant flux of the Fe XXV-K$\alpha$ line at 6.67 keV in the Galactic
diffuse X-ray emission. This time variation is mostly due to M 0.66$-$0.02; the
6.40 keV line flux declined in 2001 and decreased to 60% in the time span
1994--2005. The other spot G 0.570$-$0.018 is found to be conspicuous only in
the Chandra observation in 2000. From the long-term time variability ($\sim$10
years) of the Sgr B2 complex, we infer that the Galactic Center black hole Sgr
A$^*$ was X-ray bright in the past 300 year and exhibited a time variability
with a period of a few years.


title: Mukai duality for gerbes with connection

abstract:
  We study gerbes with connection over an etale stack via noncommutative
algebras of differential forms on a groupoid presenting the stack. We then
describe a dg-category of modules over any such algebra, which we claim
represents a dg-enhancement of the derived category of coherent analytic
sheaves on the gerbe in question.
  This category can be used to phrase and prove Fourier-Mukai type dualities
between gerbes and other noncommutative spaces. As an application of the
theory, we show that a gerbe with flat connection on a torus is dual (in a
sense analogous to Fourier-Mukai duality or T-duality) to a noncommutative
holomorphic dual torus.


title: Why is cheating wrong?

abstract:
  Since cheating is obviously wrong, arguments against it (it provides an
unfair advantage, it hinders learning) need only be mentioned in passing. But
the argument of unfair advantage absurdly takes education to be essentially a
race of all against all; moreover, it ignores that many cases of unfair
(dis)advantages are widely accepted. That cheating can hamper learning does not
mean that punishing cheating will necessarily favor learning, so that this
argument does not obviously justify sanctioning cheaters.
  -- Keywords: academic dishonesty, academic integrity, academic misconduct,
education, ethics, homework, plagiarism


title: Domain wall motion of magnetic nanowires under a static field

abstract:
  The propagation of a head-to-head magnetic domain-wall (DW) or a tail-to-tail
DW in a magnetic nanowire under a static field along the wire axis is studied.
Relationship between the DW velocity and DW structure is obtained from the
energy consideration. The role of the energy dissipation in the field-driven DW
motion is clarified. Namely, a field can only drive a domain-wall propagating
along the field direction through the mediation of a damping. Without the
damping, DW cannot propagate along the wire. Contrary to the common wisdom, DW
velocity is, in general, proportional to the energy dissipation rate, and one
needs to find a way to enhance the energy dissipation in order to increase the
propagation speed. The theory provides also a nature explanation of the
wire-width dependence of the DW velocity and velocity oscillation beyond Walker
breakdown field.


title: Purifying GHZ States Using Degenerate Quantum Codes

abstract:
  Degenerate quantum codes are codes that do not reveal the complete error
syndrome. Their ability to conceal the complete error syndrome makes them
powerful resources in certain quantum information processing tasks. In
particular, the most error-tolerant way to purify depolarized Bell states using
one-way communication known to date involves degenerate quantum codes. Here we
study three closely related purification schemes for depolarized GHZ states
shared among $m \geq 3$ players by means of degenerate quantum codes and
one-way classical communications. We find that our schemes tolerate more noise
than all other one-way schemes known to date, further demonstrating the
effectiveness of degenerate quantum codes in quantum information processing.


title:
Quantum gravity as the way from spacetime to space quantum states
  thermodynamics

abstract:
  Physical spacetime geometry follows from some effective thermodynamics of
quantum states of all fields and particles described in frames of General
Relativity. In the sense of pure field theoretical Einstein's point of view on
gravitation the thermodynamic information is actually quantum gravity. We
propose new realization of this old idea by studying the canonical 3+1
Dirac-ADM approach to pseudo-Riemannian (Lorentzian) manifold of General
Relativity. We derive the Wheeler-DeWitt theory as the Global One-Dimensional
classical field theory of the Bose field associated with embedded 3-space,
where Wheeler's superspace metric is absent. The classical theory is discussed,
some deductions on tachyon state, Dark Energy density and cosmological constant
are included. Reduction to 1st order evolution is carried out, and quantum
theory by the second quantization in the Fock space of creators and
annihilators is constructed by employing the Heisenberg equation and the
bosonic Bogoliubov transformation for diagonalization. In result we find the
static reper with stable vacuum, where quantum states of 3-space can be
considered, and finally space quantum states thermodynamics is formulated.

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


title:
Search for pair production of doubly-charged Higgs bosons in the
  H^{++}H^{--}^ to mu^+mu^+mu^-mu^- final state at D0

abstract:
  We report the results of a search for pair production of doubly-charged Higgs
bosons via ppbar to H^{++}H^{--}X to mu^+mu^+mu^-mu^-X at sqrt{s} = 1.96 TeV.
We use a dataset corresponding to an integrated luminosity of 1.1 fb^{-1}
collected from 2002 to 2006 by the D0 detector at the Fermilab Tevatron
Collider. In the absence of an excess above the standard model background,
lower mass limits of M(H^{pmpm}_L) > 150 GeV/c^2 and M(H^{pmpm}_R) > 127
GeV/c^2 at 95% C.L. are set, respectively, for left-handed and right-handed
doubly-charged Higgs bosons assuming a 100% branching ratio into muons.


title: Equations of 2-linear ideals and arithmetical rank

abstract:
  In this paper we consider reduced homogeneous ideals $\Jcal\subset S$ of a
polynomial ring $S$, having a 2-linear resolution.
  1. We study systems of generators of $\Jcal\subset S$.
  2. We compute the arithmetical rank for a large class of projective curves
having a 2-linear resolution.
  3. We show that the fiber cone $\proj \Fcal(I_{\Lcal})$ of a lattice ideal
$I_{\Lcal}$ of codimension two is a set theoretical complete intersection.


title: The Hochschild cohomology ring of a class of special biserial algebras

abstract:
  We consider a class of self-injective special biserial algebras $\Lambda_N$
over a field $K$ and show that the Hochschild cohomology ring of $\Lambda_N$ is
a finitely generated $K$-algebra. Moreover the Hochschild cohomology ring of
$\Lambda_N$ modulo nilpotence is a finitely generated commutative $K$-algebra
of Krull dimension two. As a consequence the conjecture of Snashall-Solberg
\cite{SS}, concerning the Hochschild cohomology ring modulo nilpotence, holds
for this class of algebras.


title: Gauge and Yukawa couplings in 6D supersymmetric SU(6) models

abstract:
  We study six-dimensional (6D) SU(6) supersymmetric models where the
doublet-triplet splitting, quark-lepton mass relations and gaugino-mediated
supersymmetry breaking are taken into account. We find that effective 4D gauge
coupling constants have highly nontrivial behavior between two compactification
scales. It is shown that realistic patterns of Yukawa coupling constants are
obtained for valid values of parameters and that hierarchical numbers are
generated via suppression by extra-dimensional effects.


title: Conformal mapping of Unruh temperature

abstract:
  Thanks to a local interpetation of the KMS condition, the mapping from
(unbounded) wedge regions of Minkowski space-time to (bounded) double-cone
regions is extended to the Unruh temperature associated to relevant observers
in both regions. A previous result, the diamond's temperature, is shown to be
proportional to the inverse of the conformal factor (Weyl rescaling of the
metric) of this map. One thus explains from a mathematical point of view why an
observer with finite lifetime experiences the vacuum as a thermal state
whatever his acceleration, even vanishing.


title: Substantial magneto-electric coupling near room temperature in Bi2Fe4O9

abstract:
  We report remarkable multiferroic effects in polycrystalline Bi2Fe4O9.
High-resolution X-ray diffraction shows that this compound has orthorhombic
structure. Magnetic measurements confirm an antiferromagnetic transition around
260 K. A pronounced inverse S-shape anomaly in the loss tangent of dielectric
measurement is observed near the Neel temperature. This feature shifts with the
application of magnetic field. These anomalies are indicative of substantial
coupling between the electric and magnetic orders in this compound.


title: Nonholonomic constraints in $k$-symplectic Classical Field Theories

abstract:
  A $k$-symplectic framework for classical field theories subject to
nonholonomic constraints is presented. If the constrained problem is regular
one can construct a projection operator such that the solutions of the
constrained problem are obtained by projecting the solutions of the free
problem. Symmetries for the nonholonomic system are introduced and we show that
for every such symmetry, there exist a nonholonomic momentum equation. The
proposed formalism permits to introduce in a simple way many tools of
nonholonomic mechanics to nonholonomic field theories.


title:
On the Gromov hyperbolicity of the Kobayashi metric on strictly
  pseudoconvex regions in the almost complex case

abstract:
  We prove that every bounded strictly $J$-convex region equipped with the
Kobayashi metric is hyperbolic in the sense of Gromov. We apply this result to
the study of the dynamics of pseudo-holomorphic maps.


title:
Experimental signatures of non-Abelian statistics in clustered quantum
  Hall states

abstract:
  We discuss transport experiments for various non-Abelian quantum Hall states,
including the Read-Rezayi series and a paired spin singlet state. We analyze
the signatures of the unique characters of these states on Coulomb blockaded
transport through large quantum dots. We show that the non-Abelian nature of
the states manifests itself through modulations in the spacings between Coulomb
blockade peaks as a function of the area of the dot. Even though the current
flows only along the edge, these modulations vary with the number of quasiholes
that are localized in the bulk of the dot. We discuss the effect of relaxation
of edge states on the predicted Coulomb blockade patterns, and show that it may
suppress the dependence on the number of bulk quasiholes. We predict the form
of the lowest order interference term in a Fabry-Perot interferometer for the
spin singlet state. The result indicates that this interference term is
suppressed for certain values of the quantum numbers of the collective state of
the bulk quasiholes, in agreement with previous findings for other clustered
states belonging to the Read-Rezayi series.


title: Asiago eclipsing binaries program. III. V570 Per

abstract:
  The orbit and physical parameters of the previously unsolved SB2 EB V570 Per
are derived using high resolution Asiago Echelle spectroscopy and B, V
photo-electric photometry. The metallicity from chi^2 analysis is [M/H]=+0.02
+/- 0.03, and reddening from interstellar NaI and KI absorption lines is E(B-V)
=0.023 +/- 0.007. The two components have masses of 1.449 +/- 0.006 and 1.350
+/- 0.006 Msun and spectral types F3 and F5, respectively. They are both still
within the Main Sequence band (T_1 =6842 +/- 25 K, T_2 =6562 +/- 25 K from
chi^2 analysis, R_1 =1.523 +/- 0.030, R_2 =1.388 +/- 0.019 Rsun) and are
dynamically relaxed to co-rotation with the orbital motion (Vrot sin i_{1,2}
=40 and 36 (+/-1) km/sec). The distance to V570 Per obtained from the orbital
solution is 123 +/- 2 pc, in excellent agreement with the revised Hipparcos
distance of 123 +/- 11 pc. The observed properties of V570 Per components are
compared to BaSTI models computed on purpose for exactly the observed masses
and varied chemical compositions. This system is interesting since both
components have their masses in the range where the efficiency of convective
core overshooting has to decrease with the total mass as a consequence of the
decreasing size of the convective core during the central H-burning stage. Our
numerical simulations show that, a small but not null overshooting is required,
with efficiencies lambda_{OV} =0.14 and 0.11 for the 1.449 and 1.350 Msun
components, respectively. This confirms the finding of Paper II on the similar
system V505 Per. At the approx 0.8 Gyr age of the system, the element diffusion
has reduced the surface metallicity of the models from the initial [M/H]=+0.17
to [M/H]=+0.02, in perfect agreement with the spectroscopically derived
[M/H]=+0.02 +/- 0.03 value.


title: Dafne Lifetime Optimization with Compensating Wires and Octupoles

abstract:
  Long-range beam-beam interactions (parasitic crossings) were one of the main
luminosity performance limitations for the lepton F-factory DAFNE in its
original configuration. In particular, the parasitic crossings led to a
substantial lifetime reduction of both beams in collision. This puts a limit on
the maximum storable current and, as a consequence, on the achievable peak and
integrated luminosity. In order to mitigate the problem, numerical and
experimental studies of the parasitic crossings compensation by
current-carrying wires have been done. During the operation for the KLOE
experiment two such wires have been installed at both ends of the interaction
region. They produced a relevant improvement in the lifetime of the weak beam
(positrons) at the maximum current of the strong one (electrons) without
luminosity loss, in agreement with the numerical predictions. The same
compensating mechanism has been adopted during the run for the FINUDA
experiment as well, with less evident benefits than in the previous case. The
interplay between nonlinearities originating from the beam-beam interaction and
the ring lattice has been studied by theoretical simulation and experimental
measurements. Compensation procedures have been set up relying on the
electromagnetic octupoles installed on both rings and used in addition to wire
compensation.
  In this paper the parasitic crossings effects in the DAFNE interaction
regions and their compensation by wires and octupoles are described. A detailed
theoretical analysis of the interplay about different non-linearities is
presented; eventually experimental measurements and observations are discussed.


title:
The inverse-Compton X-ray-emitting lobes of the high-redshift giant
  radio galaxy 6C 0905+39

abstract:
  We present new XMM-Newton data of the high-redshift (z=1.883), Mpc-sized
giant radio galaxy 6C 0905+39. The larger collecting area and longer
observation time for our new data means that we can better characterise the
extended X-ray emission, in particular its spectrum, which arises from cosmic
microwave background photons scattered into the X-ray band by the energetic
electrons in the spent synchrotron plasma of the (largely) radio-quiet lobes of
6C 0905+39. We calculate the energy that its jet-ejected plasma has dumped into
its surroundings in the last 3 X 10^7 years and discuss the impact that
similar, or even more extreme, examples of spent, radio-quiet lobes would have
on their surroundings. Interestingly, there is an indication that the emission
from the hotspots is softer than the rest of the extended emission and the
core, implying it is due to synchrotron emission. We confirm our previous
detection of the low-energy turnover in the eastern hotspot of 6C 0905+39.


title: Bijections for Baxter Families and Related Objects

abstract:
  The Baxter number can be written as $B_n = \sum_0^n \Theta_{k,n-k-1}$. These
numbers have first appeared in the enumeration of so-called Baxter
permutations; $B_n$ is the number of Baxter permutations of size $n$, and
$\Theta_{k,l}$ is the number of Baxter permutations with $k$ descents and $l$
rises. With a series of bijections we identify several families of
combinatorial objects counted by the numbers $\Theta_{k,l}$. Apart from Baxter
permutations, these include plane bipolar orientations with $k+2$ vertices and
$l+2$ faces, 2-orientations of planar quadrangulations with $k+2$ white and
$l+2$ black vertices, certain pairs of binary trees with $k+1$ left and $l+1$
right leaves, and a family of triples of non-intersecting lattice paths. This
last family allows us to determine the value of $\Theta_{k,l}$ as an
application of the lemma of Gessel and Viennot. The approach also allows us to
count certain other subfamilies, e.g., alternating Baxter permutations, objects
with symmetries and, via a bijection with a class of plan bipolar orientations
also Schnyder woods of triangulations, which are known to be in bijection with
3-orientations.


title: "Anomaly" in n=infinity Alday-Maldacena Duality for Wavy Circle

abstract:
  If the Alday-Maldacena version of string/gauge duality is formulated as an
equivalence between double loop and area integrals a la arXiv: 0708.1625, then
this pure geometric relation can be tested for various choices of n-side
polygons. The simplest possibility arises at n=infinity, with polygon
substituted by an arbitrary continuous curve. If the curve is a circle, the
minimal surface problem is exactly solvable. If it infinitesimally deviates
from a circle, then the duality relation can be studied by expanding in powers
of a small parameter. In the first approximation the Nambu-Goto (NG) equations
can be linearized, and the peculiar NG Laplacian plays the central role. Making
use of explicit zero-modes of this operator (NG-harmonic functions), we
investigate the geometric duality in the lowest orders for small deformations
of arbitrary shape lying in the plane of the original circle. We find a
surprisingly strong dependence of the minimal area on regularization procedure
affecting "the boundary terms" in minimal area. If these terms are totally
omitted, the remaining piece is regularization independent, but still differs
by simple numerical factors like 4 from the double-loop integral which
represents the BDS formula so that we stop short from the first non-trivial
confirmation of the Alday-Maldacena duality. This confirms the earlier-found
discrepancy for two parallel lines at n=infinity, but demonstrates that it
actually affects only a finite number (out of infinitely many) of parameters in
the functional dependence on the shape of the boundary, and the duality is only
slightly violated, which allows one to call this violation an anomaly.


title:
Adiabatic Loading of Cold Bosons in Three-Dimensional Optical Lattices
  and Superfluid-Normal Phase Transition

abstract:
  We investigate the effects of the adiabatic loading of optical lattices to
the temperature by applying the mean-field approximation to the
three-dimensional Bose-Hubbard model at finite temperatures. We compute the
lattice-height dependence of the isentropic curves for the given initial
temperatures in case of the homogeneous system i.e., neglecting the trapping
potential. Taking the unit of temperatures as the recoil energy, the adiabatic
cooling/heating through superfluid (SF) - normal (N) phase transition is
clearly understood. It is found that the cooling occurs in SF phase while the
heating occurs in N phase and the efficiency of adibatic cooling/heating is
higher at higher temperatures. We also explain how its behavior can be
understood from the lattice-hight dependence of dispersion relation in each
phase. Furthermore, the connection of the adiabatic heating/cooling between the
cases with/without the trapping potential is discussed.


title:
Metal abundances at z<1.5: new measurements in sub-Damped Lyman-alpha
  Absorbers

abstract:
  Damped Lyman-alpha systems (DLAs) and sub-DLAs seen toward background quasars
provide the most detailed probes of elemental abundances. Somewhat
paradoxically these measurements are more difficult at lower redshifts due to
the atmospheric cut-off, and so a few years ago our group began a programme to
study abundances at z < 1.5 in quasar absorbers. In this paper, we present new
UVES observations of six additional quasar absorption line systems at z < 1.5,
five of which are sub-DLAs. We find solar or above solar metallicity, as
measured by the abundance of zinc, assumed not to be affected by dust, in two
sub-DLAs: one, towards Q0138-0005 with [Zn/H]=+0.28 +/- 0.16; the other towards
Q2335+1501 with [Zn/H]=+0.07 +/- 0.34. Relatively high metallicity was observed
in another system: Q0123-0058 with [Zn/H]=-0.45 +/- 0.20. Only for the one DLA
in our sample, in Q0449-1645, do we find a low metallicity, [Zn/H]=-0.96 +/-
0.08. We also note that in some of these systems large relative abundance
variations from component to component are observed in Si, Mn, Cr and Zn.


title:
Nonanalyticities of the entropy induced by saddle points of the
  potential energy landscape

abstract:
  The relation between saddle points of the potential of a classical
many-particle system and the analyticity properties of its Boltzmann entropy is
studied. For finite systems, each saddle point is found to cause a
nonanalyticity in the Boltzmann entropy, and the functional form of this
nonanalytic term is derived for the generic case of potentials having the Morse
property. With increasing system size the order of the nonanalytic term grows
unboundedly, leading to an increasing differentiability of the entropy.
Nonetheless, a distribution of an unboundedly growing number of saddle points
may cause a phase transition in the thermodynamic limit. Analyzing the
contribution of the saddle points to the density of states in the thermodynamic
limit, conditions on the distribution of saddle points and their curvatures are
derived which are necessary for a phase transition to occur. With these
results, the puzzling absence of topological signatures in the spherical model
is elucidated. As further applications, the phase transitions of the mean-field
XY model and the mean-field k-trigonometric model are shown to be induced by
saddle points of vanishing curvature.


title:
Bound states of bosons and fermions in a mixed vector-scalar coupling
  with unequal shapes for the potentials

abstract:
  The Klein-Gordon and the Dirac equations with vector and scalar potentials
are investigated under a more general condition, $V_{v}+V_{s}=
\mathrm{constant}$. These intrinsically relativistic and isospectral problems
are solved in a case of squared hyperbolic potential functions and bound states
for either particles or antiparticles are found. The eigenvalues and
eigenfuntions are discussed in some detail and the effective Compton wavelength
is revealed to be an important physical quantity. It is revealed that a boson
is better localized than a fermion when they have the same mass and are
subjected to the same potentials.


title:
Loss of least-loaded class in asexual populations due to drift and
  epistasis

abstract:
  We consider the dynamics of a non-recombining haploid population of finite
size which accumulates deleterious mutations irreversibly. This ratchet like
process occurs at a finite speed in the absence of epistasis, but it has been
suggested that synergistic epistasis can halt the ratchet. Using a diffusion
theory, we find explicit analytical expressions for the typical time between
successive clicks of the ratchet for both non-epistatic and epistatic fitness
functions. Our calculations show that the inter-click time is of a scaling form
which in the absence of epistasis gives a speed that is determined by size of
the least-loaded class and the selection coefficient. With synergistic
interactions, the ratchet speed is found to approach zero rapidly for arbitrary
epistasis. Our analytical results are in good agreement with the numerical
simulations.


title:
Cavity Approach to the Spectral Density of Sparse Symmetric Random
  Matrices

abstract:
  The spectral density of various ensembles of sparse symmetric random matrices
is analyzed using the cavity method. We consider two cases: matrices whose
associated graphs are locally tree-like, and sparse covariance matrices. We
derive a closed set of equations from which the density of eigenvalues can be
efficiently calculated. Within this approach, the Wigner semicircle law for
Gaussian matrices and the Marcenko-Pastur law for covariance matrices are
recovered easily. Our results are compared with numerical diagonalization,
finding excellent agreement.


title: Optical Quantum Computing

abstract:
  In 2001 all-optical quantum computing became feasible with the discovery that
scalable quantum computing is possible using only single photon sources, linear
optical elements, and single photon detectors. Although it was in principle
scalable, the massive resource overhead made the scheme practically daunting.
However, several simplifications were followed by proof-of-principle
demonstrations, and recent approaches based on cluster states or error encoding
have dramatically reduced this worrying resource overhead, making an
all-optical architecture a serious contender for the ultimate goal of a
large-scale quantum computer. Key challenges will be the realization of
high-efficiency sources of indistinguishable single photons, low-loss, scalable
optical circuits, high efficiency single photon detectors, and low-loss
interfacing of these components.


title:
Privacy Preserving ID3 over Horizontally, Vertically and Grid
  Partitioned Data

abstract:
  We consider privacy preserving decision tree induction via ID3 in the case
where the training data is horizontally or vertically distributed. Furthermore,
we consider the same problem in the case where the data is both horizontally
and vertically distributed, a situation we refer to as grid partitioned data.
We give an algorithm for privacy preserving ID3 over horizontally partitioned
data involving more than two parties. For grid partitioned data, we discuss two
different evaluation methods for preserving privacy ID3, namely, first merging
horizontally and developing vertically or first merging vertically and next
developing horizontally. Next to introducing privacy preserving data mining
over grid-partitioned data, the main contribution of this paper is that we
show, by means of a complexity analysis that the former evaluation method is
the more efficient.


title:
Searching for doubly charged Higgs bosons in M\"{o}ller scattering by
  resonance effects at linear $e^-e^-$ collider

abstract:
  We discuss the parity-violating left-right asymmetries (LRAs) in M\"{o}ller
scattering at the International Linear Collider (ILC) induced by doubly charged
Higgs bosons in models with $SU(2)_L$ triplet and singlet scalar bosons, which
couple to the left- and right-handed charged leptons, respectively. These
bosons are important in the scenarios for the generation of the neutrino mass.
We demonstrate that the contributions to the LRAs from the triplet and singlet
bosons are opposite to each other. In particular, we show that the doubly
charged Higgs boson from the singlet scalar can be tested at the ILC by using
the resonance effect.


title: A sharp Wirtinger inequality and some related functional spaces

abstract:
  We consider the generalized Wirtinger inequality \[ (\int_{0}^{T} a |u|^q
)^{1/q} \le C \biggm(\int_{0}^{T} a^{1-p} |u'|^{p}\biggm)^{1/p}, \] with
$p,q>1$, $T>0$, $a\in L^1[0,T]$, $a\ge0$, $a\not\equiv0$ and where $u$ is a
$T$-periodic function satisfying the constraint \[ \int_{0}^{T} a |u|^{q-2}u
=0. \] We provide the best constant $C>0$ as well as all extremals.
Furthermore, we characterize the natural functional space where the inequality
is defined.


title:
Fluctuations in protein synthesis from a single RNA template: stochastic
  kinetics of ribosomes

abstract:
  Proteins are polymerized by cyclic machines called ribosome which use their
messenger RNA (mRNA) track also as the corresponding template and the process
is called translation. We explore, in depth and detail, the stochastic nature
of the translation. We compute various distributions associated with the
translation process; one of them, namely dwell time distribution, has been
measured in recent single ribosome experiments (Wen et al. Nature {\bf 452},
598 (2008)). The form of this distribution predicted by our theory is
consistent with that extracted from the experimental data. For our quantitative
calculations, we use a model that captures both the mechano-chemistry of each
individual ribosome as well as their steric interactions. We also demonstrate
the effects of the sequence inhomogeneities of real genes on the fluctuations
and noise in translation. In principle, our new predictions can be tested by
carrying out {\it in-vitro} experiments.

categories: physics.bio-ph cond-mat.stat-mech q-bio.GN q-bio.QM q-bio.SC


title: Out-of-phase mixed holographic gratings: a quantative analysis

abstract:
  We show, that by performing a simultaneous analysis of the angular
dependencies of the +/- first and the zeroth diffraction orders of mixed
holographic gratings, each of the relevant parameters can be obtained: the
strength of the phase grating and the amplitude grating, respectively, as well
as a potential phase between them. Experiments on a pure lithium niobate
crystal are used to demonstrate the applicability of the analysis.


title: Magnetic field induced 3D to 1D crossover in type II superconductors

abstract:
  We review and analyze magnetization and specific heat investigations on
type-II superconductors which uncover remarkable evidence for the magnetic
field induced fnite size effect and the associated 3D to 1D crossover which
enhances thermal fluctuations.


title: Short Time Dynamics of Scalar Products in Hilbert Space

abstract:
  We use the semiclassical method proposed in \cite{Adelcio2003} to study
scalar products such as the overlap, Husimi functions and fidelity decay. Scars
of classical periodic orbits arise naturally in this pertubative expansion. We
also derive analytically a well known numerical result that fidelity has a
quadratic decay for short times. We study the overlap in the chaotic regime and
integrable for some simple systems.


title: Power Towers of String Instantons for N=1 Vacua

abstract:
  We provide arguments for the existence of novel hereinafter called
poly-instanton corrections to holomorphic couplings in four-dimensional N=1
supersymmetric string compactifications. After refining quantitatively the
D-brane instanton calculus for corrections to the gauge kinetic function, we
explicitly apply it to the Type I toroidal orbifold defined in arXiv:0710.3080
and compare the results to the proposed heterotic S-dual model. This leads us
to the intriguing conclusion that N=1 string vacua feature a power tower like
proliferation of instanton corrections.


title:
Quantized current of a hybrid single-electron transistor with
  superconducting leads and a normal-metal island

abstract:
  We discuss the operation of the superconductor - insulator - normal-metal -
insulator - superconductor (SINIS) turnstile. This voltage-biased hybrid
single-electron transistor (SET) provides current quantization even with only
one radio-frequency (rf) control parameter, namely the gate voltage of the
single island. We give an overview of the main error mechanisms of the
turnstile and consider its feasibility as a quantum current standard. We also
present experimental results of pumping with the SINIS structure which show
decreased leakage current compared to earlier measurements with the opposite
NISIN structure.


title: The collapse transition on superhydrophobic surfaces

abstract:
  We investigate the transition between the Cassie-Baxter and Wenzel states of
a slowly evaporating, micron-scale drop on a superhydrophobic surface. In two
dimensions analytical results show that there are two collapse mechanisms. For
long posts the drop collapses when it is able to overcome the free energy
barrier presented by the hydrophobic posts. For short posts, as the drop loses
volume, its curvature increases allowing it to touch the surface below the
posts. We emphasise the importance of the contact line retreating across the
surface as the drop becomes smaller: this often preempts the collapse. In a
quasi-three dimensional simulation we find similar behaviour, with the
additional feature that the drop can de-pin from all but the peripheral posts,
so that its base resembles an inverted bowl.


title: Kondo flow invariants, twisted K-theory and Ramond-Ramond charges

abstract:
  We take a worldsheet point of view on the relation between Ramond-Ramond
charges, invariants of boundary renormalization group flows and K-theory. In
compact super Wess-Zumino-Witten models, we show how to associate invariants of
the generalized Kondo renormalization group flows to a given supersymmetric
boundary state. The procedure involved is reminiscent of the way one can probe
the Ramond-Ramond charge carried by a D-brane in conformal field theory, and
the set of these invariants is isomorphic to the twisted K-theory of the Lie
group. We construct various supersymmetric boundary states, and we compute the
charges of the corresponding D-branes, disproving two conjectures on this
subject. We find a complete agreement between our algebraic charges and the
geometry of the D-branes.


title: Compact Q-balls in the complex signum-Gordon model

abstract:
  We discuss Q-balls in the complex signum-Gordon model in d-dimensional space
for d=1,2,3. The Q-balls have strictly finite radius. Their total energy is a
power-like function of the conserved U(1) charge with the exponent equal to
(d+2)/(d+3). In the cases d=1 and d=3 explicit analytic solutions are
presented.


title:
Form-factors and current correlators: chiral couplings L_10(mu) and
  C_87(mu) at NLO in 1/N(C)

abstract:
  Using the resonance chiral theory Lagrangian, we perform a calculation of the
vector and axial-vector two-point functions at the next-to-leading order (NLO)
in the 1/N(C) expansion. We have analyzed these correlators within the
single-resonance approximation and have also investigated the corrections
induced by a second multiplet of vector and axial-vector resonance states.
Imposing the correct QCD short-distance constraints, one determines the
difference of the two correlators Pi(t) = Pi_VV(t)- Pi_AA(t) in terms of the
pion decay constant and resonance masses. Its low momentum expansion fixes then
the low-energy chiral couplings L_10 and C_87 at NLO, keeping full control of
their renormalization scale dependence. At mu_0=0.77 GeV, we obtain L_10(mu_0)
= (-4.4 \pm 0.9)10^{-3} and C_87^r(mu_0)=(3.1 \pm 1.1)10^{-5}.


title: Dempster-Shafer for Anomaly Detection

abstract:
  In this paper, we implement an anomaly detection system using the
Dempster-Shafer method. Using two standard benchmark problems we show that by
combining multiple signals it is possible to achieve better results than by
using a single signal. We further show that by applying this approach to a
real-world email dataset the algorithm works for email worm detection.
Dempster-Shafer can be a promising method for anomaly detection problems with
multiple features (data sources), and two or more classes.


title: Partial Dynamical Symmetries in the g9/2 Shell-Progress and Puzzles

abstract:
  We present analytic proofs of the properties of four particle states in the
g9/2 shell which have seniority v=4 and angular momentum I=4 or 6.We show in
particular that the number of pairs with angular momentum I is equal to one for
these states.


title: Nonlinear optimal control synthesis via occupation measures

abstract:
  We consider nonlinear optimal control problems (OCPs) for which all problem
data are polynomial. In the first part of the paper, we review how occupation
measures can be used to approximate pointwise the optimal value function of a
given OCP, using a hierarchy of linear matrix inequality (LMI) relaxations. In
the second part, we extend the methodology to approximate the optimal value
function on a given set and we use such a function to constructively and
computationally derive an almost optimal control law. Numerical examples show
the effectiveness of the approach.


title:
Equation of state for strongly interacting matter: collective effects,
  Landau damping and predictions for LHC

abstract:
  The equation of state (EOS) is of utmost importance for the description of
the hydrodynamic phase of strongly interacting matter in relativistic heavy-ion
collisions. Lattice QCD can provide useful information on the EOS, mainly for
small net baryon densities. The QCD quasiparticle model provides a means to map
lattice QCD results into regions relevant for a variety of experiments. We
report here on effects of collectives modes and damping on the EOS. Some
predictions for forthcoming heavy-ion collisions at LHC/ALICE are presented and
perspectives for deriving an EOS for FAIR/CBM are discussed.


title:
A new test procedure of independence in copula models via
  chi-square-divergence

abstract:
  We introduce a new test procedure of independence in the framework of
parametric copulas with unknown marginals. The method is based essentially on
the dual representation of $\chi^2$-divergence on signed finite measures. The
asymptotic properties of the proposed estimate and the test statistic are
studied under the null and alternative hypotheses, with simple and standard
limit distributions both when the parameter is an interior point or not.


title:
Soft Dynamics simulation: normal approach of deformable particles in a
  viscous fluid

abstract:
  Discrete simulation methods are efficient tools to investigate the complex
behaviors of complex fluids made of either dry granular materials or dilute
suspensions. By contrast, materials made of soft and/or concentrated units
(emulsions, foams, vesicles, dense suspensions) can exhibit both significant
elastic particle deflections (Hertz-like response) and strong viscous forces
(squeezed liquid). We point out that the gap between two particles is then not
determined solely by the positions of their centers, but rather exhibits its
own dynamics. We provide a new discrete numerical method, named Soft Dynamics,
to simulate the combined dynamics of particles and contacts. As an
illustration, we present the results for the approach of two particles. We
recover the scaling behaviors expected in three limits: the Stokes limit for
very large gaps, the Poiseuille-lubricated limit for small gaps and even
smaller surface deflections, and the Hertz limit for significant surface
deflections. Larger scale simulations with this new method are a promising tool
for investigating the collective behaviors of many complex materials.


title: Dynamical Evolution of Disk Galaxies

abstract:
  Spiral patterns are important agents of galaxy evolution. In this review, I
describe how the redistribution of angular momentum by recurrent transient
spiral patterns causes the random speeds of stars to rise over time,
metallicity gradients to be reduced, and drives large-scale turbulence in the
disk, which could be important for galactic dynamos. I also outline a possible
mechanism for the recurrence of spiral instabilities and supporting evidence
from solar neighborhood kinematics. Finally, I confirm that cloud scattering
alone would predict the local velocity ellipsoid to be flattened, contrary to
long-held expectations.


title: A Quantifier Elimination Algorithm for Linear Real Arithmetic

abstract:
  We propose a new quantifier elimination algorithm for the theory of linear
real arithmetic. This algorithm uses as subroutine satisfiability modulo this
theory, a problem for which there are several implementations available. The
quantifier elimination algorithm presented in the paper is compared, on
examples arising from program analysis problems, to several other
implementations, all of which cannot solve some of the examples that our
algorithm solves easily.


title: Simulation Optimization of the Crossdock Door Assignment Problem

abstract:
  The purpose of this report is to present the Crossdock Door Assignment
Problem, which involves assigning destinations to outbound dock doors of
Crossdock centres such that travel distance by material handling equipment is
minimized. We propose a two fold solution; simulation and optimization of the
simulation model simulation optimization. The novel aspect of our solution
approach is that we intend to use simulation to derive a more realistic
objective function and use Memetic algorithms to find an optimal solution. The
main advantage of using Memetic algorithms is that it combines a local search
with Genetic Algorithms. The Crossdock Door Assignment Problem is a new domain
application to Memetic Algorithms and it is yet unknown how it will perform.


title:
Performances and stability of a 2.4 ton Gd organic liquid scintillator
  target for antineutrino detection

abstract:
  In this work we report the performances and the chemical and physical
properties of a (2 x 1.2) ton organic liquid scintillator target doped with Gd
up to ~0.1%, and the results of a 2 year long stability survey. In particular
we have monitored the amount of both Gd and primary fluor actually in solution,
the optical and fluorescent properties of the Gd-doped liquid scintillator
(GdLS) and its performances as a neutron detector, namely neutron capture
efficiency and average capture time. The experimental survey is ongoing, the
target being continuously monitored. After two years from the doping time the
performances of the Gd-doped liquid scintillator do not show any hint of
degradation and instability; this conclusion comes both from the laboratory
measurements and from the "in-tank" measurements. This is the largest stable
Gd-doped organic liquid scintillator target ever produced and continuously
operated for a long period.


title: Metastable anisotropy orientation of nematic quantum Hall fluids

abstract:
  We analyze the experimental observation of metastable anisotropy resistance
orientation at half filled quantum Hall fluids by means of a model of a quantum
nematic liquid in an explicit symmetry breaking potential. We interpret the
observed ``rotation'' of the anisotropy axis as a process of nucleation of
nematic domains and compute the nucleation rate within this model. By comparing
with experiment, we are able to predict the critical radius of nematic bubbles,
$R_c\sim 2.6 \mu m $. Each domain contains about $10^4$ electrons.


title: Temperature induced spin coherence dissipation in quantum dots

abstract:
  The temperature dependence of electron spin coherence in singly negatively
charged (In,Ga)As/GaAs quantum dots is studied by time-resolved Faraday
rotation. The decoherence time T2 is constant on a microsecond scale for
temperatures below 20 K, for higher temperatures it shows a surprisingly sharp
drop into the nanoseconds range. The decrease cannot be explained through
inelastic scattering with phonons, and may be related with elastic scattering
due to phonon-mediated fluctuations of the hyperfine interaction.


title: Images directes et fonctions L en cohomologie rigide

abstract:
  Let $k$ be a perfect field of characteristic $p>0$, $\mathcal{V}$ a complete
discrete valuation ring with residue field $k$ and field of fractions $K$ of
characteristic 0, and $S$ a separated $k$-scheme of finite type. When $S$ is
smooth over $k$, we partially prove here a conjecture of Berthelot about the
overconvergence of the higher direct images of the structure sheaf under a
proper smooth morphism $f:X\to S$; when $k$ is perfect and $\mathcal{V}$ is
tamely ramified such direct images are always convergent, not only for the
structure sheaf but also for (almost) every convergent $F$-isocrystals. More
generally, we prove this overconvergence when $f$ is liftable over
$\mathcal{V}$, or when $X$ is a relative complete intersection in some
projective spaces over $S$, and taking as coefficients any overconvergent
isocrystals. We then apply these results to $L$-functions with coefficients
such direct images with Frobenius structure: we derive rationality or
meromorphy for these $L$-functions (Dwork's conjecture), and we study their
$p$-adic unit zeroes and poles (Katz's conjecture) ; and explicit case concerns
the ordinary abelian schemes. A more precise presentation of results by
chapters is given in the introduction.


title:
How to detect the pseudospin-1/2 Berry phase in a photonic crystal with
  a Dirac spectrum

abstract:
  We propose a method to detect the geometric phase produced by the Dirac-type
band structure of a triangular-lattice photonic crystal. The spectrum is known
to have a conical singularity (= Dirac point) with a pair of nearly degenerate
modes near that singularity described by a spin-1/2 degree of freedom (=
pseudospin). The geometric Berry phase acquired upon rotation of the pseudospin
is in general obscured by a large and unspecified dynamical phase. We use the
analogy with graphene to show how complementary media can eliminate the
dynamical phase. A transmission minimum results as a direct consequence of the
geometric phase shift of pi acquired by rotation of the pseudospin over 360
degrees around a perpendicular axis. We support our analytical theory based on
the Dirac equation by a numerical solution of the full Maxwell equations.


title:
A class of statistical models to weaken independence in two-way
  contingency tables

abstract:
  In this paper we study a new class of statistical models for contingency
tables. We define this class of models through a subset of the binomial
equations of the classical independence model. We use some notions from
Algebraic Statistics to compute their sufficient statistic, and to prove that
they are log-linear. Moreover, we show how to compute maximum likelihood
estimates and to perform exact inference through the Diaconis-Sturmfels
algorithm. Examples show that these models can be useful in a wide range of
applications.


title: E.C.G. Stueckelberg: a forerunner of modern physics II

abstract:
  We will investigate some aspects of Stueckelberg's work, which have
contributed to the development of modern physics. On the one hand, the
definition of diffuse boundaries in the calculation of scattering amplitudes
will be reviewed, and compared with the other proposals by physicists of that
time. On the other hand, the applications of Stueckelberg's description of a
massive vector field in the Standard Model will be discussed.


title: Distribution of Angles in Hyperbolic Lattices

abstract:
  We prove an effective equidistribution result about angles in a hyperbolic
lattice. We use this to generalize a result due to F. P. Boca.


title:
Cosmological constraints on neutrino plus axion hot dark matter: Update
  after WMAP-5

abstract:
  We update our previous constraints on two-component hot dark matter (axions
and neutrinos), including the recent WMAP 5-year data release. Marginalising
over sum m_nu provides m_a < 1.02 eV (95% C.L.) for the axion mass. In the
absence of axions we find sum m_nu < 0.63 eV (95% C.L.).


title: Spatio-activity based object detection

abstract:
  We present the SAMMI lightweight object detection method which has a high
level of accuracy and robustness, and which is able to operate in an
environment with a large number of cameras. Background modeling is based on DCT
coefficients provided by cameras. Foreground detection uses similarity in
temporal characteristics of adjacent blocks of pixels, which is a
computationally inexpensive way to make use of object coherence. Scene model
updating uses the approximated median method for improved performance.
Evaluation at pixel level and application level shows that SAMMI object
detection performs better and faster than the conventional Mixture of Gaussians
method.


title:
A functional renormalization group approach to systems with long-range
  correlated disorder

abstract:
  We studied the statics and dynamics of elastic manifolds in disordered media
with long-range correlated disorder using functional renormalization group
(FRG). We identified different universality classes and computed the critical
exponents and universal amplitudes describing geometric and velocity-force
characteristics. In contrast to uncorrelated disorder, the statistical tilt
symmetry is broken resulting in a nontrivial response to a transverse tilting
force. For instance, the vortex lattice in disordered superconductors shows a
new glass phase whose properties interpolate between those of the Bragg and
Bose glasses formed by pointlike and columnar disorder, respectively. Whereas
there is no response in the Bose glass phase (transverse Meissner effect), the
standard linear response expected in the Bragg-glass gets modified to a power
law response in the presence of disorder correlations. We also studied the long
distance properties of the O(N) spin system with random fields and random
anisotropies correlated as 1/x^{d-sigma}. Using FRG we obtained the phase
diagram in (d,sigma,N)-parameter space and computed the corresponding critical
exponents. We found that below the lower critical dimension 4+sigma, there can
exist two different types of quasi-long-range-order with zero order-parameter
but infinite correlation length.


title: Pion and muon production in electron-positron photon plasma

abstract:
  We study production and equilibration of pions and muons in relativistic
electron-positron-photon plasma at a temperature $T\ll m_\mu, m_\pi $. We argue
that the observation of pions and muons can be a diagnostic tool in the study
of the initial properties of such a plasma formed by means of strong laser
fields. Conversely, properties of muons and pions in thermal environment become
accessible to precise experimental study.

categories: hep-ph nucl-ex nucl-th physics.optics physics.plasm-ph


title: A new market model in the large volatility case

abstract:
  We will compare three types of prices, namely, rational (hedging) prices,
geometric (growth rate) prices, and martingale (measure) prices. We will show
that rational prices in the complete market theory are sometimes contrary to
common sense. In the continuous-time case, we insist that the market model
should differ between the small volatility case and the large volatility case.


title: On some generalized reinforced random walks on integers

abstract:
  We consider Reinforced Random Walks where transition probabilities are a
function of the proportion of times the walk has traversed an edge. We give
conditions for recurrence or transience. A phase transition is observed,
similar to Pemantle \cite{Pem000} on trees.


title: Fedosov and Riemannian supermanifolds

abstract:
  Generalizations of symplectic and metric structures for supermanifolds are
analyzed. Two types of structures are possible according to the even/odd
character of the corresponding quadratic tensors. In the even case one has a
very rich set of geometric structures: even symplectic supermanifolds (or,
equivalently, supermanifolds with non-degenerate Poisson structures), even
Fedosov supermanifolds and even Riemannian supermanifolds. The existence of
relations among those structures is analyzed in some details. In the odd case,
we show that odd Riemannian and Fedosov supermanifolds are characterized by a
scalar curvature tensor. However, odd Riemannian supermanifolds can only have
constant curvature.


title: Discussion on the recent proton-DVCS results of Jefferson Lab

abstract:
  We present the recent data issued from the Halls A and B of Jefferson
Laboratory for the Deep Virtual Compton Scattering Process on the proton. An
important set of data for beam spin asymmetries, unpolarized cross sections and
differences of polarized cross sections have been obtained. We modestly attempt
a first "global" analysis of these three observables at a single $<x_B>$,
$<Q^2>$ and $<-t>$ kinematic point. We find that it is extremely challenging to
describe simultaneously these data in the framework of a few Generalized Parton
Distributions models.


title:
Theta dependence of SU(N) gauge theories in the presence of a
  topological term

abstract:
  We review results concerning the theta dependence of 4D SU(N) gauge theories
and QCD, where theta is the coefficient of the CP-violating topological term in
the Lagrangian. In particular, we discuss theta dependence in the large-N
limit.
  Most results have been obtained within the lattice formulation of the theory
via numerical simulations, which allow to investigate the theta dependence of
the ground-state energy and the spectrum around theta=0 by determining the
moments of the topological charge distribution, and their correlations with
other observables. We discuss the various methods which have been employed to
determine the topological susceptibility, and higher-order terms of the theta
expansion. We review results at zero and finite temperature. We show that the
results support the scenario obtained by general large-N scaling arguments, and
in particular the Witten-Veneziano mechanism to explain the U(1)_A problem. We
also compare with results obtained by other approaches, especially in the
large-N limit, where the issue has been also addressed using, for example, the
AdS/CFT correspondence.
  We discuss issues related to theta dependence in full QCD: the neutron
electric dipole moment, the dependence of the topological susceptibility on the
quark masses, the U(1)_A symmetry breaking at finite temperature.
  We also consider the 2D CP(N) model, which is an interesting theoretical
laboratory to study issues related to topology. We review analytical results in
the large-N limit, and numerical results within its lattice formulation.
  Finally, we discuss the main features of the two-point correlation function
of the topological charge density.


title:
Decoy states for quantum key distribution based on decoherence-free
  subspaces

abstract:
  Quantum key distribution with decoherence-free subspaces has been proposed to
overcome the collective noise to the polarization modes of photons flying in
quantum channel. Prototype of this scheme have also been achieved with
parametric-down conversion source. However, a novel type of
photon-number-splitting attack we proposed in this paper will make the
practical implementations of this scheme insecure since the parametric-down
conversion source may emit multi-photon pairs occasionally. We propose decoy
states method to make these implementations immune to this attack. And with
this decoy states method, both the security distance and key bit rate will be
increased.


title:
On the Doubly Refined Enumeration of Alternating Sign Matrices and
  Totally Symmetric Self-Complementary Plane Partitions

abstract:
  We prove the equality of doubly refined enumerations of Alternating Sign
Matrices and of Totally Symmetric Self-Complementary Plane Partitions using
integral formulae originating from certain solutions of the quantum
Knizhnik--Zamolodchikov equation.


title: Using Intelligent Agents to understand organisational behaviour

abstract:
  This paper introduces two ongoing research projects which seek to apply
computer modelling techniques in order to simulate human behaviour within
organisations. Previous research in other disciplines has suggested that
complex social behaviours are governed by relatively simple rules which, when
identified, can be used to accurately model such processes using computer
technology. The broad objective of our research is to develop a similar
capability within organisational psychology.


title:
On the non--existence of certain hyperovals in dual Andr\'e planes of
  order $2^{2h}$

abstract:
  No regular hyperoval of the Desarguesian affine plane $AG(2,2^{2h})$, with
$h>1$, is inherited by a dual Andr\'e plane of order $2^{2h}$ with dimension 2
over its centre.


title: A Multi-Agent Simulation of Retail Management Practices

abstract:
  We apply Agent-Based Modeling and Simulation (ABMS) to investigate a set of
problems in a retail context. Specifically, we are working to understand the
relationship between human resource management practices and retail
productivity. Despite the fact we are working within a relatively novel and
complex domain, it is clear that intelligent agents do offer potential for
developing organizational capabilities in the future. Our multi-disciplinary
research team has worked with a UK department store to collect data and capture
perceptions about operations from actors within departments. Based on this case
study work, we have built a simulator that we present in this paper. We then
use the simulator to gather empirical evidence regarding two specific
management practices: empowerment and employee development.


title:
Thickness dependence of linear and quadratic magneto-optical Kerr effect
  in ultrathin Fe(001) films

abstract:
  Magneto-optical Kerr effect (MOKE) magnetometry is one of the most widely
employed techniques for the characterization of ferromagnetic thin-film
samples. Some information, such as coercive fields or anisotropy strengths can
be obtained without any knowledge of the optical and magneto-optical (MO)
properties of the material. On the other hand, a quantitative analysis, which
requires a precise knowledge of the material's index of refraction n and the MO
coupling constants K and G is often desirable, for instance for the comparison
of samples, which are different with respect to ferromagnetic layer
thicknesses, substrates, or capping layers. While the values of the parameters
n and the linear MO coupling parameter K reported by different authors usually
vary considerably, the relevant quadratic MO coupling parameters G of Fe are
completely unknown. Here, we report on measurements of the thickness dependence
(0-60nm) of the linear and quadratic MOKE in epitaxial bcc-Fe(001) wedge-type
samples performed at a commonly used laser wavelength of 670nm. By fitting the
thickness dependence we are able to extract a complete set of parameters n, K,
(G11 - G12), and G44 for the quantitative description of the MOKE of
bcc-Fe(001). We find sizable different n, K, and G parameters for films thinner
than about 10nm as compared to thicker films, which is indicative of a
thickness dependence of the electronic properties or of surface contributions
to the MOKE. The effect size of the quadratic MOKE is found to be about a third
of the record values recently reported for Co2FeSi.


title: Understanding Retail Productivity by Simulating Management Practise

abstract:
  Intelligent agents offer a new and exciting way of understanding the world of
work. In this paper we apply agent-based modeling and simulation to investigate
a set of problems in a retail context. Specifically, we are working to
understand the relationship between human resource management practices and
retail productivity. Despite the fact we are working within a relatively novel
and complex domain, it is clear that intelligent agents could offer potential
for fostering sustainable organizational capabilities in the future. Our
research so far has led us to conduct case study work with a top ten UK
retailer, collecting data in four departments in two stores. Based on our case
study data we have built and tested a first version of a department store
simulator. In this paper we will report on the current development of our
simulator which includes new features concerning more realistic data on the
pattern of footfall during the day and the week, a more differentiated view of
customers, and the evolution of customers over time. This allows us to
investigate more complex scenarios and to analyze the impact of various
management practices.


title: Enhancing the yield of high-order harmonics with an array of gas jets

abstract:
  We report the experimental observation of an enhancement in the yield of
high-order harmonics using an array of gas jets as the source medium. By
comparing the experimental outcome for jet arrays of different spacings with
the predicted harmonic intensity in the case of slit sources of equivalent
lengths, we clearly show how the periodic modulation of the gas density can
improve the harmonic yield. This behavior may attributed to a
quasi-phase-matching effect which increases the length of coherent harmonic
build-up during propagation by partially counteracting the dephasing induced by
free electrons.


title:
The Damage Spreading Method in Monte Carlo Simulations: A brief overview
  and applications to confined magnetic materials

abstract:
  In this paper we first give a brief overview of Monte Carlo simulation
results obtained by applying the Damage Spreading method. We analyse the
transition between a state where the damage becomes healed (the frozen phase)
and a regime where the damage spreads arriving at a finite (stationary) value
(the damaged phase), when a control parameter is finely tuned. These kinds of
transitions are actually true irreversible phase transitions themselves, and
the issue of their universality class is also discussed.
  Subsequently, the attention is focused on the propagation of damage in
magnetic systems placed in confined geometries, such as the Abraham's Model,
the standard Ising magnet (Glauber dynamics) and the corner geometry. The
influence of interfaces between magnetic domains of different orientation on
the spreading of the perturbation is also discussed, showing that the presence
of interfaces enhances the propagation of the damage. Furthermore, the critical
transition between propagation and nonpropagation of the damage is discussed.
In all cases, the determined critical exponents suggest that the DS transition
does not belong to the universality class of Directed Percolation, unlike many
other systems exhibiting irreversible phase transitions. This result reflects
the dramatic influence of interfaces on the propagation of perturbations in
magnetic systems.


title: Cotton flow

abstract:
  Using the conformally invariant Cotton tensor, we define a geometric flow,
the "Cotton flow", which is exclusive to three dimensions. This flow tends to
evolve the initial metrics into conformally flat ones, and is somewhat
orthogonal to the Yamabe flow, the latter being a flow within a conformal
class. We define an entropy functional, and study the flow of nine homogeneous
spaces both numerically and analytically. In particular, we show that the
arbitrarily deformed homogeneous 3-sphere flows into the round 3-sphere. Two of
the nine homogeneous geometries, which are degenerated by the Ricci flow, are
left intact by the Cotton flow.


title:
Using Intelligent Agents to Understand Management Practices and Retail
  Productivity

abstract:
  Intelligent agents offer a new and exciting way of understanding the world of
work. In this paper we apply agent-based modeling and simulation to investigate
a set of problems in a retail context. Specifically, we are working to
understand the relationship between human resource management practices and
retail productivity. Despite the fact we are working within a relatively novel
and complex domain, it is clear that intelligent agents could offer potential
for fostering sustainable organizational capabilities in the future. The
project is still at an early stage. So far we have conducted a case study in a
UK department store to collect data and capture impressions about operations
and actors within departments. Furthermore, based on our case study we have
built and tested our first version of a retail branch simulator which we will
present in this paper.


title: Semiclassical Quantisation of Finite-Gap Strings

abstract:
  We perform a first principle semiclassical quantisation of the general
finite-gap solution to the equations of a string moving on R x S^3. The
derivation is only formal as we do not regularise divergent sums over stability
angles. Moreover, with regards to the AdS/CFT correspondence the result is
incomplete as the fluctuations orthogonal to this subspace in AdS_5 x S^5 are
not taken into account. Nevertheless, the calculation serves the purpose of
understanding how the moduli of the algebraic curve gets quantised
semiclassically, purely from the point of view of finite-gap integration and
with no input from the gauge theory side. Our result is expressed in a very
compact and simple formula which encodes the infinite sum over stability angles
in a succinct way and reproduces exactly what one expects from knowledge of the
dual gauge theory. Namely, at tree level the filling fractions of the algebraic
curve get quantised in large integer multiples of hbar = 1/lambda^{1/2}. At
1-loop order the filling fractions receive Maslov index corrections of hbar/2
and all the singular points of the spectral curve become filled with small
half-integer multiples of hbar. For the subsector in question this is in
agreement with the previously obtained results for the semiclassical energy
spectrum of the string using the method proposed in hep-th/0703191.
  Along the way we derive the complete hierarchy of commuting flows for the
string in the R x S^3 subsector. Moreover, we also derive a very general and
simple formula for the stability angles around a generic finite-gap solution.
We also stress the issue of quantum operator orderings since this problem
already crops up at 1-loop in the form of the subprincipal symbol.


title: Symmetric Numerical Semigroups Generated by Fibonacci and Lucas Triples

abstract:
  The symmetric numerical semigroups S(F_a,F_b,F_c) and S(L_k,L_m,L_n)
generated by three Fibonacci (F_a,F_b,F_c) and Lucas (L_k,L_m,L_n) numbers are
considered. Based on divisibility properties of the Fibonacci and Lucas numbers
we establish necessary and sufficient conditions for both semigroups to be
symmetric and calculate their Hilbert generating series, Frobenius numbers and
genera.


title:
A mathematical structure for the generalization of the conventional
  algebra

abstract:
  An abstract mathematical framework is presented in this paper as a
unification of several deformed or generalized algebra proposed recently in the
context of generalized statistical theories intended to treat certain complex
thermodynamic or statistical systems. It is shown that, from mathematical point
of view, any bijective function can be used in principle to formulate an
algebra in which the conventional algebraic rules are generalized.


title: Spectrum of diffractively produced gluons in onium-nucleus collisions

abstract:
  We calculate spectrum of diffractively produced gluons in onium-heavy nucleus
collisions at high energies. We show that it exhibits a characteristic
dependence on nucleus atomic number A and energy/rapidity. We argue that this
dependence offers a unique possibility for determining the low-x structure of
nuclear matter. Applications to RHIC, LHC and EIC experimental programs are
discussed.


title: Ground based gamma-ray astronomy with Cherenkov Telescopes

abstract:
  Very-high-energy (>100 GeV) gamma-ray astronomy is emerging as an important
discipline in both high energy astrophysics and astro-particle physics. This
field is currently dominated by Imaging Atmospheric-Cherenkov Telescopes
(IACTs) and arrays of these telescopes. Such arrays have achieved the best
angular resolution and energy flux sensitivity in the gamma-ray domain and are
still far from the fundamental limits of the technique. Here I will summarise
some key aspects of this technique and go on to review the current status of
the major instruments and to highlight selected recent results.


title: A Queueing System for Modeling a File Sharing Principle

abstract:
  We investigate in this paper the performance of a simple file sharing
principle. For this purpose, we consider a system composed of N peers becoming
active at exponential random times; the system is initiated with only one
server offering the desired file and the other peers after becoming active try
to download it. Once the file has been downloaded by a peer, this one
immediately becomes a server. To investigate the transient behavior of this
file sharing system, we study the instant when the system shifts from a
congested state where all servers available are saturated by incoming demands
to a state where a growing number of servers are idle. In spite of its apparent
simplicity, this queueing model (with a random number of servers) turns out to
be quite difficult to analyze. A formulation in terms of an urn and ball model
is proposed and corresponding scaling results are derived. These asymptotic
results are then compared against simulations.


title: The Thermodynamics of Quarks and Gluons

abstract:
  This is an introduction to the study of strongly interacting matter. We
survey its different possible states and discuss the transition from hadronic
matter to a plasma of deconfined quarks and gluons. Following this, we
summarize the results provided by lattice QCD finite temperature and density,
and then investigate the nature of the deconfinement transition. Finally we
give a schematic overview of possible ways to study the properties of the
quark-gluon plasma.


title: Solution to the Burnside Problem

abstract:
  The Burnside Problem asks whether a finitely generated group of exponent n is
finite.
  We present a solution for 2-generator groups of prime power exponent. Results
of P. Hall and G. Higman extends the finiteness conclusion to groups having
composite exponents. Our main result, called the Generalized Burnside Theorem,
is a solvability theorem that applies to a family of groups called GB
(Generalized Burnside) groups that contain infinite as well as finite groups.
The final section discusses the extension to k-generator groups although
details are left for another time.


title: The Kahler-Ricci flow and K-stability

abstract:
  We consider the K\"ahler-Ricci flow on a Fano manifold. We show that if the
curvature remains uniformly bounded along the flow, the Mabuchi energy is
bounded below, and the manifold is K-polystable, then the manifold admits a
K\"ahler-Einstein metric. The main ingredient is a result that says that a
sufficiently small perturbation of a cscK manifold admits a cscK metric if it
is K-polystable.


title: On 0-homology of categorical at zero semigroups

abstract:
  The isomorphism of 0-homology groups of a categorical at zero semigroup and
homology groups of its 0-reflector is proved. Some applications of 0-homology
to Eilenberg-MacLane homology of semigroups are given.


title:
Submillimeter observations of the J2142-4423 Lya protocluster at z =
  2.38

abstract:
  We present observations aimed at exploring both the nature of Lya emitting
nebulae (Lya blobs) at z=2.38 and the way they trace large scale structure
(LSS), by exploring their proximity to maximum starbursts through submillimeter
emission. Our most important objectives are to make a census of associated
submillimeter galaxies (SMGs), check their properties, and look for a possible
overdensity in the protocluster J2142-4426 at z=2.38.
  We used the newly commissioned Large APEX Bolometer Camera (LABoCa) on the
Atacama Pathfinder EXperiment (APEX) telescope, in its Science Verification
phase, to carry out a deep 10'x10' map at 870 micron, and we performed multiple
checks of the quality of data processing and source extraction.
  Our map, the first published deep image, confirms the capabilities of
APEX/LABoCa as the most efficient current equipment for wide and deep submm
mapping. Twenty-two sources were securely extracted with 870 micron flux
densities in the range 3-21 mJy, rms noise 0.8-2.4 mJy, and far-IR luminosities
probably in the range ~5-20 x 10(12) Lo. Only one of the four 50 kpc-extended
Lya blobs has a secure 870 micron counterpart. The 870 micron source counts in
the whole area are marginally higher than in the SHADES SCUBA survey, with a
possible over-density around this blob. The majority of the 3.6-24 micron SEDs
of the submillimeter sources indicate they are starburst dominated, with
redshifts mostly >2. However, there is evidence of a high-z AGN in ~30% of the
sources.


title: Planck priors for dark energy surveys

abstract:
  Although cosmic microwave background (CMB) anisotropy data alone cannot
constrain simultaneously the spatial curvature and the equation of state of
dark energy, CMB data provide a valuable addition to other experimental
results. However computing a full CMB power spectrum with a Boltzmann code is
quite slow; for instance if we want to work with many dark energy and/or
modified gravity models, or would like to optimize experiments where many
different configurations need to be tested, it is possible to adopt a quicker
and more efficient approach.
  In this paper we consider the compression of the projected Planck CMB data
into four parameters, R (scaled distance to last scattering surface), l_a
(angular scale of sound horizon at last scattering), Omega_b h^2 (baryon
density fraction) and n_s (powerlaw index of primordial matter power spectrum),
all of which can be computed quickly. We show that, although this compression
loses information compared to the full likelihood, such information loss
becomes negligible when more data is added. We also demonstrate that the method
can be used for scalar field dark energy independently of the parametrisation
of the equation of state, and discuss how this method should be used for other
kinds of dark energy models.


title: Jirim kuark - mikroskopi elektron attoskala ke atas proton

abstract:
  We review experiments colliding electrons(/positrons) on protons at high
energies at HERA, focussing on the ZEUS experiment. We describe the ZEUS
detector, including its data acquisition system, and look at a specific part,
namely the electronic system for its calorimeter readout control, in more
detail. Data analysis is described, and results pertaining the proton structure
is given. It is found that the naive quark model cannot explain the results
obtained at small fractional momentum, and this requires quantum
chromodynamics. Also it is found that diffractive reactions, with large
rapidity gaps, contribute substantially; efforts are being carried out to
understand them.


title: Magnetic field switching in parallel quantum dots

abstract:
  We show that the Coulomb blockade in parallel dots pierced by magnetic flux
$\Phi$ completely blocks the resonant current for any value of $\Phi$ except
for integer multiples of the flux quantum $\Phi_0$. This non-analytic
(switching) dependence of the current on $\Phi$ arises only when the dot states
that carry the current are of the same energy. The time needed to reach the
steady state, however, diverges when $\Phi\to n\Phi_0$.


title: Massive Star Formation in the Galactic Center

abstract:
  The Galactic center is a hotbed of star formation activity, containing the
most massive star formation site and three of the most massive young star
clusters in the Galaxy. Given such a rich environment, it contains more stars
with initial masses above 100 \Msun than anywhere else in the Galaxy. This
review concerns the young stellar population in the Galactic center, as it
relates to massive star formation in the region. The sample includes stars in
the three massive stellar clusters, the population of younger stars in the
present sites of star formation, the stars surrounding the central black hole,
and the bulk of the stars in the field population. The fossil record in the
Galactic center suggests that the recently formed massive stars there are
present-day examples of similar populations that must have been formed through
star formation episodes stretching back to the time period when the Galaxy was
forming.


title:
Exponential Lagrangian for the Gravitational Field and the problem of
  Vacuum Energy

abstract:
  We will analyze two particular features of an exponential gravitational
Lagrangian. On the one hand, while this choice of the Lagrangian density allows
for two free parameters, only one scale, the cosmological constant, arises as
fundamental when the proper Einsteinian limit is to be recovered. On the other
hand, the vacuum energy arising from $f(R)$ theories such that $f(0)\neq 0$
needs a cancellation mechanism, by which the present value of the cosmological
constant can be recast.


title: An Agent-Based Simulation of In-Store Customer Experiences

abstract:
  Agent-based modelling and simulation offers a new and exciting way of
understanding the world of work. In this paper we describe the development of
an agent-based simulation model, designed to help to understand the
relationship between human resource management practices and retail
productivity. We report on the current development of our simulation model
which includes new features concerning the evolution of customers over time. To
test some of these features we have conducted a series of experiments dealing
with customer pool sizes, standard and noise reduction modes, and the spread of
the word of mouth. Our multi-disciplinary research team draws upon expertise
from work psychologists and computer scientists. Despite the fact we are
working within a relatively novel and complex domain, it is clear that
intelligent agents offer potential for fostering sustainable organisational
capabilities in the future.


title: Crucial inputs to nucleosynthesis calculations

abstract:
  The first part of the paper discusses nuclear properties relevant to predict
compound reactions. The second part addresses direct reactions with special
emphasis on direct neutron capture.


title:
The origin of the infrared emission in radio galaxies I: new mid- to
  far-infrared and radio observations of the 2Jy sample

abstract:
  As part of a large study to investigate the nature of the longer wavelength
continuum emission of radio-loud AGN, we present new mid to far-infrared (MFIR)
and high frequency radio observations for a complete sample of 2Jy powerful,
southern radio galaxies at intermediate redshifts (0.05<z<0.7). Utilizing the
sensitivity of the Spitzer Space Telescope, we have made deep MIPS observations
at the wavelengths of 24, 70 and 160 microns, detecting 100% of our sample at
24 microns, and 90% at 70 microns. This high detection rate at MFIR wavelengths
is unparallelled in samples of intermediate redshift radio galaxies.
Complementing these results, we also present new high frequency observations
(15 to 24Ghz) from the Australia Telescope Compact Array (ATCA) and the Very
Large Array (VLA), which are used to investigate the potential contamination of
the MFIR continuum by non-thermal synchrotron emission. With the latter
observations we detect the compact cores in 59% of our complete sample, and
deduce that non-thermal contamination of the MFIR continuum is significant in a
maximum of 30% of our total sample. MFIR fluxes, radio fluxes and spectral
energy distributions for the complete sample are presented here, while in a
second paper we will analyse these data and discuss the implications for our
understanding of the heating mechanism for the warm/cool dust, star formation
in the host galaxies, and the unified schemes for powerful radio sources.


title: A spectral line survey of NGC 7027 at millimeter wavelengths

abstract:
  We report on a recent spectral line survey of the planetary nebula (PN) NGC
7027 using the Arizona Radio Observatory (ARO) 12m telescope and the Heinrich
Hertz Submillimeter Telescope (SMT) at millimeter wavelengths. The spectra
covering the frequency ranges 71--111GHz, 157--161GHz, and 218--267GHz were
obtained with a typical sensitivity of rms<8mK. A total of 67 spectral lines
are detected, 21 of which are identified with 8 molecular species, 32 with
recombination lines from hydrogen and helium, and 14 remains unidentified. As
the widths of emission lines from CO, other neutral molecules, molecular ions,
as well as recombination of H+ and He+ are found to be different with each
other, the line strengths and profiles are used to investigate the physical
conditions and chemical processes of the neutral envelope of NGC 7027. The
column densities and fractional abundances relative to H2 of the observed
molecular species are calculated and compared with predictions from chemical
models. We found evidence for overabundance of N2H+ and underabundance of CS
and HNC in NGC 7027, suggesting that X-ray emission and shock wave may play an
important role in the chemistry of the hot molecular envelope of the young PN.


title: Physicalism versus quantum mechanics

abstract:
  In the context of theories of the connection between mind and brain,
physicalism is the demand that all is basically purely physical. But the
concept of "physical" embodied in this demand is characterized essentially by
the properties of the physical that hold in classical physical theories.
Certain of these properties contradict the character of the physical in quantum
mechanics, which provides a better, more comprehensive, and more fundamental
account of phenomena. It is argued that the difficulties that have plaged
physicalists for half a century, and that continue to do so, dissolve when the
classical idea of the physical is replaced by its quantum successor. The
argument is concretized in a way that makes it accessible to non-physicists by
exploiting the recent evidence connecting our conscious experiences to
macroscopic measurable synchronous oscillations occurring in well-separated
parts of the brain. A specific new model of the mind-brain connection that is
fundamentally quantum mechanical but that ties conscious experiences to these
macroscopic synchronous oscillations is used to illustrate the essential
disparities between the classical and quantum notions of the physical, and in
particular to demonstrate the failure in the quantum world of the principle of
the causal closure of the physical, a failure that goes beyond what is entailed
by the randomness in the outcomes of observations, and that accommodates the
efficacy in the brain of conscious intent.


title:
Genetic-Algorithm Seeding Of Idiotypic Networks For Mobile-Robot
  Navigation

abstract:
  Robot-control designers have begun to exploit the properties of the human
immune system in order to produce dynamic systems that can adapt to complex,
varying, real-world tasks. Jernes idiotypic-network theory has proved the most
popular artificial-immune-system (AIS) method for incorporation into
behaviour-based robotics, since idiotypic selection produces highly adaptive
responses. However, previous efforts have mostly focused on evolving the
network connections and have often worked with a single, pre-engineered set of
behaviours, limiting variability. This paper describes a method for encoding
behaviours as a variable set of attributes, and shows that when the encoding is
used with a genetic algorithm (GA), multiple sets of diverse behaviours can
develop naturally and rapidly, providing much greater scope for flexible
behaviour-selection. The algorithm is tested extensively with a simulated
e-puck robot that navigates around a maze by tracking colour. Results show that
highly successful behaviour sets can be generated within about 25 minutes, and
that much greater diversity can be obtained when multiple autonomous
populations are used, rather than a single one.


title: Monodromy of a family of hypersurfaces

abstract:
  Let $Y$ be an $(m+1)$-dimensional irreducible smooth complex projective
variety embedded in a projective space. Let $Z$ be a closed subscheme of $Y$,
and $\delta$ be a positive integer such that $\mathcal I_{Z,Y}(\delta)$ is
generated by global sections. Fix an integer $d\geq \delta +1$, and assume the
general divisor $X \in |H^0(Y,\ic_{Z,Y}(d))|$ is smooth. Denote by
$H^m(X;\mathbb Q)_{\perp Z}^{\text{van}}$ the quotient of $H^m(X;\mathbb Q)$ by
the cohomology of $Y$ and also by the cycle classes of the irreducible
components of dimension $m$ of $Z$. In the present paper we prove that the
monodromy representation on $H^m(X;\mathbb Q)_{\perp Z}^{\text{van}}$ for the
family of smooth divisors $X \in |H^0(Y,\ic_{Z,Y}(d))|$ is irreducible.


title: Component models for large networks

abstract:
  Being among the easiest ways to find meaningful structure from discrete data,
Latent Dirichlet Allocation (LDA) and related component models have been
applied widely. They are simple, computationally fast and scalable,
interpretable, and admit nonparametric priors. In the currently popular field
of network modeling, relatively little work has taken uncertainty of data
seriously in the Bayesian sense, and component models have been introduced to
the field only recently, by treating each node as a bag of out-going links. We
introduce an alternative, interaction component model for communities (ICMc),
where the whole network is a bag of links, stemming from different components.
The former finds both disassortative and assortative structure, while the
alternative assumes assortativity and finds community-like structures like the
earlier methods motivated by physics. With Dirichlet Process priors and an
efficient implementation the models are highly scalable, as demonstrated with a
social network from the Last.fm web site, with 670,000 nodes and 1.89 million
links.


title: Fundamental Symmetries of the extended Spacetime

abstract:
  On the basis of Fourier duality and Stone-von Neumann theorem, we will
examine polymer-quantization techniques and modified uncertainty relations as
possible 1-extraD compactification schemes for a phenomenological truncation of
the extraD tower.


title:
Galaxy populations in the Antlia cluster. I. Photometric properties of
  early-type galaxies

abstract:
  We present the first colour-magnitude relation (CMR) of early-type galaxies
in the central region of the Antlia cluster, obtained from CCD wide-field
photometry in the Washington photometric system. Integrated (C -T1) colours, T1
magnitudes, and effective radii have been measured for 93 galaxies (i.e. the
largest galaxies sample in the Washington system till now) from the FS90
catalogue (Ferguson & Sandage 1990). Membership of 37 objects can be confirmed
through new radial velocities and data collected from the literature. The
resulting colour-magnitude diagram shows that early-type FS90 galaxies that are
spectroscopically confirmed Antlia members or that were considered as definite
members by FS90, follow a well defined CMR (sigma_(C -T1) ~ 0.07 mag) that
spans 9 magnitudes in brightness with no apparent change of slope. This
relation is very tight for the whole magnitude range but S0 galaxies show a
larger dispersion, apparently due to a separation of ellipticals and S0s.
Antlia displays a slope of -13.6 in a T1 vs. (C -T1) diagram, in agreement with
results for clusters like Fornax, Virgo, Perseus and Coma, which are
dynamically different to Antlia. This fact might indicate that the build up of
the CMR in cluster of galaxies is more related to galaxies internal processes
than to the influence of the environment. Interpreting the CMR as a
luminosity-metallicity relation of old stellar systems, the metallicities of
the Antlia galaxies define a global relation down to Mv ~ -13. We also find,
for early-type dwarfs, no clear relation between luminosity and effective
radius, indicating a nearly constant mean effective radius of ~ 1 kpc. This
value is also found in several samples of dwarf galaxies in Virgo and Coma.


title:
Spatially resolved enhancement of fluorescence and Raman scattering by
  Ag nanoparticle arrays

abstract:
  Highly ordered periodic arrays of silver nanoparticles have been fabricated
which exhibit surface plasmon resonances in the visible spectrum. We
demonstrate the ability of these structures to alter the fluorescence
properties of vicinal dye molecules by providing an additional radiative decay
channel. Using fluorescence lifetime imaging microscopy, we have created high
resolution spatial maps of the molecular lifetime components; these show an
order of magnitude increase in decay rate from a localized volume around the
nanoparticles, resulting in a commensurate enhancement in the fluorescence
emission intensity. Spatial maps of the Raman scattering signal from molecules
on the nanoparticles shows an enhancement of more than 5 orders of magnitude.