title:
Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Data
  Processing, Sky Maps, and Basic Results

abstract:
  We present new full-sky temperature and polarization maps in five frequency
bands from 23 to 94 GHz, based on data from the first five years of the WMAP
sky survey. The five-year maps incorporate several improvements in data
processing made possible by the additional years of data and by a more complete
analysis of the instrument calibration and in-flight beam response. We present
several new tests for systematic errors in the polarization data and conclude
that Ka band data (33 GHz) is suitable for use in cosmological analysis, after
foreground cleaning. This significantly reduces the overall polarization
uncertainty. With the 5 year WMAP data, we detect no convincing deviations from
the minimal 6-parameter LCDM model: a flat universe dominated by a cosmological
constant, with adiabatic and nearly scale-invariant Gaussian fluctuations.
Using WMAP data combined with measurements of Type Ia supernovae and Baryon
Acoustic Oscillations, we find (68% CL uncertainties): Omega_bh^2 = 0.02267 \pm
0.00059, Omega_ch^2 = 0.1131 \pm 0.0034, Omega_Lambda = 0.726 \pm 0.015, n_s =
0.960 \pm 0.013, tau = 0.084 \pm 0.016, and Delta_R^2 = (2.445 \pm 0.096) x
10^-9. From these we derive: sigma_8 = 0.812 \pm 0.026, H_0 = 70.5 \pm 1.3
km/s/Mpc, z_{reion} = 10.9 \pm 1.4, and t_0 = 13.72 \pm 0.12 Gyr. The new limit
on the tensor-to-scalar ratio is r < 0.22 (95% CL). We obtain tight,
simultaneous limits on the (constant) dark energy equation of state and spatial
curvature: -0.14 < 1+w < 0.12 and -0.0179 < Omega_k < 0.0081 (both 95% CL). The
number of relativistic degrees of freedom (e.g. neutrinos) is found to be
N_{eff} = 4.4 \pm 1.5, consistent with the standard value of 3.04. Models with
N_{eff} = 0 are disfavored at >99.5% confidence.


title:
Theoretical Investigation of Fermion Pairings in Three-band Extended
  Hubbard Model

abstract:
  The two-dimensional d-p model (or extended Hubbard model) on a square lattice
is investigated for fermion pairing by a slave boson method. The inter-site
d-fermion interaction is introduced additionally. The momentum space
counterpart of this interaction is taken to be separable and expanded in terms
of basis functions corresponding to mixed symmetry states. The investigation
leads to anomalous pairing of fermion fields only for pure d-wave symmetry. The
charge and spin ordering gaps appear in the single- particle spectrum when
d(x,y) state is taken into account.The non-Fermi liquid behavior is found to be
the prevalent one generally. The study yields a good qualitative account of the
nodal-antinodal dichotomy. Two gaps appear in the normal state spectrum; the
larger one corresponds to the sum and the smaller to the difference of spin and
charge ordering gaps. This two-gap scenario is in qualitative agreement with
recent experimental finding.


title:
A Single Charged Quantum Dot in a Strong Optical Field: Absorption,
  Gain, and the AC Stark Effect

abstract:
  We investigate a singly-charged quantum dot under a strong optical driving
field by probing the system with a weak optical field. When the driving field
is detuned from the trion transition, the probe absorption spectrum is shifted
from the trion resonance as a consequence of the dynamic Stark effect.
Simultaneously, a gain sideband is created, resulting from the coherent energy
transfer between the optical fields through the quantum dot nonlinearity. As
the pump detuning is moved from red to blue, we map out the anticrossing of
these two spectral lines. The optical Bloch equations for a stationary
two-level atom can be used to describe the numerous spectral features seen in
this nano solid state system.


title: Transport in suspended graphene

abstract:
  Motivated by recent experiments on suspended graphene showing carrier
mobilities as high as 200,000 cm^2/Vs, we theoretically calculate transport
properties assuming Coulomb impurities as the dominant scattering mechanism. We
argue that the substrate-free experiments done in the diffusive regime are
consistent with our theory and verify many of our earlier predictions including
(i) removal of the substrate will increase mobility since most of the charged
impurities are in the substrate, (ii) the minimum conductivity is not
universal, but depends on impurity concentration with cleaner samples having a
higher minimum conductivity. We further argue that experiments on suspended
graphene put strong constraints on the two parameters involved in our theory,
namely, the charged impurity concentration n_imp and d, the typical distance of
a charged impurity from the graphene sheet. The recent experiments on suspended
graphene indicate a residual impurity density of 1-2 \times 10^{10} cm^{-2}
which are presumably stuck to the graphene interface, compared to impurity
densities of ~10^{12} cm^{-2} for graphene on SiO_2 substrate. Transport
experiments can therefore be used as a spectroscopic tool to identify the
properties of the remaining impurities in suspended graphene.


title: Instabilities of chromodyons in SO(5) gauge theory

abstract:
  Attempts to construct chromodyons - objects with both magnetic charge and
non-Abelian electric charge - in the context of spontaneously broken gauge
theories have been thwarted in the past by topological obstructions to globally
defining the unbroken non-Abelian "color'' subgroup. In this paper we consider
the possibility of chromodyons in a theory with SO(5) broken to SU(2) X U(1),
where the topological obstructions are absent. We start by constructing a
monopole with only magnetic charge. By exciting a global gauge zero mode about
this monopole, we obtain a chromodyonic configuration that is an approximate
solution of the field equations. We then numerically simulate the time
evolution of this initial state, to see if it settles down in a stationary
solution. Instead, we find that chromo-electric charge is continually radiated
away, with every indication that this process will continue until this charge
has been completely lost. We argue that this presents strong evidence against
the existence of stable chromodyons.


title:
Finite Layer Thickness Stabilizes the Pfaffian State for the 5/2
  Fractional Quantum Hall Effect: Wavefunction Overlap and Topological
  Degeneracy

abstract:
  We find the finite-width, i.e., the layer thickness, of experimental
quasi-two dimensional systems produces a physical environment sufficient to
stabilize the Moore-Read Pfaffian state thought to describe the fractional
quantum Hall effect at filling factor $\nu=5/2$. This conclusion is based on
exact calculations performed in the spherical and torus geometries, studying
wavefunction overlap and ground state degeneracy


title:
Thermal Casimir vs Casimir-Polder forces: Equilibrium and
  non-equilibrium forces

abstract:
  We critically discuss the common belief that the thermal Casimir-Polder force
can always be represented as a Matsubara sum, as it is true for the Casimir
force. On the contrary, an exact treatment of the atom-field coupling reveals
that for a ground-state atom, terms associated with virtual-photon absorption
contribute to the force which are identified as a signature of non-equilibrium
dynamics. Even the equilibrium force on a thermalized atom or molecule may be
overestimated when using the ground-state polarizability instead of its thermal
counterpart.


title: Evidence for production of single top quarks

abstract:
  We present first evidence for the production of single top quarks in the D0
detector at the Fermilab Tevatron ppbar collider. The standard model predicts
that the electroweak interaction can produce a top quark together with an
antibottom quark or light quark, without the antiparticle top quark partner
that is always produced from strong coupling processes. Top quarks were first
observed in pair production in 1995, and since then, single top quark
production has been searched for in ever larger datasets. In this analysis, we
select events from a 0.9 fb-1 dataset that have an electron or muon and missing
transverse energy from the decay of a W boson from the top quark decay, and
two, three, or four jets, with one or two of the jets identified as originating
from a b hadron decay. The selected events are mostly backgrounds such as
W+jets and ttbar events, which we separate from the expected signals using
three multivariate analysis techniques: boosted decision trees, Bayesian neural
networks, and matrix element calculations. A binned likelihood fit of the
signal cross section plus background to the data from the combination of the
results from the three analysis methods gives a cross section for single top
quark production of 4.7 +- 1.3 pb. The probability to measure a cross section
at this value or higher in the absence of signal is 0.014%, corresponding to a
3.6 standard deviation significance. The measured cross section value is
compatible at the 10% level with the standard model prediction for electroweak
top quark production.


title: A Deep HST Study of the Globular Cluster NGC 6397: Reduction Methods

abstract:
  We describe here the reduction methods that we developed to study the
faintest red dwarfs and white dwarfs in an outer field of NGC6397, which was
observed by \hst for 126 orbits in 2005. The particular challenge of this data
set is that the faintest stars are not readily visible in individual exposures,
so special care must be taken to combine the information in all the exposures
in order to identify and measure them. Unfortunately, it is hard to find the
faintest stars without also finding a large number of faint galaxies, so we
developed specialized tools to distinguish between the point-like stars and the
barely resolved galaxies. We found that artificial-star tests, while obviously
necessary for completeness determination, can also play an important role in
helping us optimize our finding and measuring algorithms. Although this paper
focuses on this data set specifically, many of the techniques are new and might
find application in other work, particularly when a large number of images is
available for a single field.


title:
SUSY constraints from relic density: high sensitivity to pre-BBN
  expansion rate

abstract:
  The sensitivity of the lightest supersymmetric particle relic density
calculation to the variation of the cosmological expansion rate before
nucleosynthesis is discussed. We show that such a modification, even extremely
modest and with no consequence on the cosmological observations, can greatly
enhance the calculated relic density, and therefore change the constraints on
the SUSY parameter space drastically. We illustrate this variation in two
examples of SUSY models, and show that it is unsafe to use the lower bound of
the WMAP limits in order to constrain supersymmetry. We therefore suggest to
use only the upper value Omega_DM h^2 < 0.135.


title: Dimers on the Triangular Kagome Lattice

abstract:
  We derive exact results for close-packed dimers on the triangular kagome
lattice (TKL), formed by inserting triangles into the triangles of the kagome
lattice. Because the TKL is a non-bipartite lattice, dimer-dimer correlations
are short-ranged, so that the ground state at the Rokhsar-Kivelson (RK) point
of the corresponding quantum dimer model on the same lattice is a short-ranged
spin liquid. Using the Pfaffian method, we derive an exact form for the free
energy, and we find that the entropy is 1/3 ln2 per site, regardless of the
weights of the bonds. The occupation probability of every bond is 1/4 in the
case of equal weights on every bond. Similar to the case of lattices formed by
corner-sharing triangles (such as the kagome and squagome lattices), we find
that the dimer-dimer correlation function is identically zero beyond a certain
(short) distance. We find in addition that monomers are deconfined on the TKL,
indicating that there is a short-ranged spin liquid phase at the RK point. We
also find exact results for the ground state energy of the classical Heisenberg
model. The ground state can be ferromagnetic, ferrimagnetic, locally coplanar,
or locally canted, depending on the couplings. From the dimer model and the
classical spin model, we derive upper bounds on the ground state energy of the
quantum Heisenberg model on the TKL.


title: Indigenous amino acids in primitive CR meteorites

abstract:
  CR meteorites are among the most primitive meteorites. In this paper, we
report the first measurements of amino acids in Antarctic CR meteorites, two of
which show the highest amino acid concentrations ever found in a chondrite.
EET92042, GRA95229 and GRO95577 were analyzed for their amino acid content
using high performance liquid chromatography with UV fluorescence detection
(HPLC-FD) and gas chromatographymass spectrometry (GC-MS). Our data show that
EET92042 and GRA95229 are the most amino acid-rich chondrites ever analyzed,
with total amino acid concentrations ranging from 180 parts-per-million (ppm)
to 249 ppm. GRO95577, however, is depleted in amino acids. The most abundant
amino acids present in the EET92042 and GRA95229 meteorites are the alpha-amino
acids glycine, isovaline, alpha-aminoisobutyric acid (alpha-AIB), and alanine,
with delta13C values ranging from +31.6per mil to +50.5per mil. The carbon
isotope results together with racemic enantiomeric ratios determined for most
amino acids strongly indicate an extraterrestrial origin of these compounds. In
addition, the relative abundances of alpha-AIB and beta-alanine in the
Antarctic CR meteorites analyzed appear to correspond to the degree of aqueous
alteration on their respective parent body.


title: Charge Fractionalization in nonchiral Luttinger systems

abstract:
  One-dimensional metals, such as quantum wires or carbon nanotubes, can carry
charge in arbitrary units, smaller or larger than a single electron charge.
However, according to Luttinger theory, which describes the low-energy
excitations of such systems, when a single electron is injected by tunneling
into the middle of such a wire, it will tend to break up into separate charge
pulses, moving in opposite directions, which carry definite fractions $f$ and
$(1-f)$ of the electron charge, determined by a parameter $g$ that measures the
strength of charge interactions in the wire. (The injected electron will also
produce a spin excitation, which will travel at a different velocity than the
charge excitations.) Observing charge fractionalization physics in an
experiment is a challenge in those (nonchiral) low-dimensional systems which
are adiabatically coupled to Fermi liquid leads. We theoretically discuss a
first important step towards the observation of charge fractionalization in
quantum wires based on momentum-resolved tunneling and multi-terminal
geometries, and explain the recent experimental results of H. Steinberg {\it et
al.}, Nature Physics {\bf 4}, 116 (2008).


title: On the HI content, dust-to-gas ratio and nature of MgII absorbers

abstract:
  We estimate the mean dust-to-gas ratio of MgII absorbers as a function of
rest equivalent width W_0 and redshift over the range 0.5<z<1.4. Using the
expanded SDSS/HST sample of low-redshift Lyman-alpha absorbers we first show
the existence of a 8-sigma correlation between the mean hydrogen column density
<N_HI> and W_0, an indicator of gas velocity dispersion. By combining these
results with recent dust-reddening measurements we show that the mean
dust-to-gas ratio of MgII absorbers does not appreciably depend on rest
equivalent width. Assuming that, on average, dust-to-gas ratio is proportional
to metallicity, we find its redshift evolution to be consistent with that of
L^star galaxies from z=0.5 to 1.4 and we show that our constraints disfavor
dwarf galaxies as the origin of such absorbers. We discuss other scenarii and
favor galactic outflows from ~L^star galaxies as the origin of the majority of
strong MgII absorbers. Finally, we show that, once evolutionary effects are
taken into account, the Bohlin et al. relation between A_V and N_H is also
satisfied by strong MgII systems down to lower column densities than those
probed in our Galaxy.


title:
HAT-P-7b: An Extremely Hot Massive Planet Transiting a Bright Star in
  the Kepler Field

abstract:
  We report on the latest discovery of the HATNet project; a very hot giant
planet orbiting a bright (V = 10.5) star with a small semi-major axis of a =
0.0377 +/- 0.0005 AU. Ephemeris for the system is P = 2.2047299 +/- 0.0000040
days, mid-transit time E = 2,453,790.2593 +/- 0.0010 (BJD). Based on the
available spectroscopic data on the host star and photometry of the system, the
planet has a mass of Mp = 1.78+/-^{0.08}_{0.05} MJup and radius of Rp =
1.36+/-^{0.20}_{0.09} RJup. The parent star is a slightly evolved F6 star with
M = 1.47+/-^{0.08}_{-0.05} Msun,R = 1.84+/-^{0.23}_{0.11} Rsun, Teff = 6350 +/-
80 K, and metallicity [Fe/H] = +0.26 +/- 0.08. The relatively hot and large
host star, combined with the close orbit of the planet, yield a very high
planetary irradiance of (4.71+/-^{1.44}_{0.05}) 10^9 erg cm^{-2}s^{-1}, which
places the planet near the top of the pM class of irradiated planets as defined
by Fortney et al. (2007). If as predicted by Fortney et al. (2007) the planet
re-radiates its absorbed energy before distributing it to the night side, the
day-side temperature should be about (2730+/-^{150}_{100}) K. Because the host
star is quite bright, measurement of the secondary eclipse should be feasible
for ground-based telescopes, providing a good opportunity to compare the
predictions of current hot Jupiter atmospheric models with the observations.
Moreover, the host star falls in the field of the upcoming Kepler mission;
hence extensive space-borne follow-up, including not only primary transit and
secondary eclipse observations but also asteroseismology, will be possible.


title:
Compressible or incompressible blend of interacting monodisperse star
  and linear polymers near a surface

abstract:
  We consider a lattice model of a mixture of repulsive, attractive, or neutral
monodisperse star (species A) and linear (species B) polymers with a third
monomeric species C, which may represent free volume. The mixture is next to a
hard, infinite plate whose interactions with A and C can be attractive,
repulsive, or neutral. These two interactions are the only parameters necessary
to specify the effect of the surface on all three components. We numerically
study monomer density profiles using the method of Gujrati and Chhajer that has
already been previously applied to study polydisperse and monodisperse
linear-linear blends next to surfaces. The resulting density profiles always
show an enrichment of linear polymers in the immediate vicinity of the surface,
due to entropic repulsion of the star core. However, the integrated surface
excess of star monomers is sometimes positive, indicating an overall enrichment
of stars. This excess increases with the number of star arms only up to a
certain critical number and decreases thereafter. The critical arm number
increases with compressibility (bulk concentration of C). The method of Gujrati
and Chhajer is computationally ultrafast and can be carried out on a PC, even
in the incompressible case, when simulations are unfeasible. Calculations of
density profiles usually take less than 20 minutes on PCs.


title: A catalog of mid-infrared sources in the Extended Groth Strip

abstract:
  The Extended Groth Strip (EGS) is one of the premier fields for extragalactic
deep surveys. Deep observations of the EGS with the Infrared Array Camera
(IRAC) on the Spitzer Space Telescope cover an area of 0.38 square degrees to a
50% completeness limit of 1.5 uJy at 3.6 um. The catalog comprises 57434
objects detected at 3.6 um, with 84%, 28%, and 24% also detected at 4.5, 5.8,
and 8.0 um. Number counts are consistent with results from other Spitzer
surveys. Color distributions show that the EGS IRAC sources comprise a mixture
of populations: low-redshift star-forming galaxies, quiescent galaxies
dominated by stellar emission at a range of redshifts, and high redshift
galaxies and AGN.


title: Dangerous implications of a minimum length in quantum gravity

abstract:
  The existence of a minimum length and a generalization of the Heisenberg
uncertainty principle seem to be two fundamental ingredients required in any
consistent theory of quantum gravity. In this letter we show that they would
predict dangerous processes which are phenomenologically unacceptable. For
example, long--lived virtual super--Planck mass black holes may lead to rapid
proton decay. Possible solutions of this puzzle are briefly discussed.


title:
One-Dimensional Impenetrable Anyons in Thermal Equilibrium. II.
  Determinant Representation for the Dynamic Correlation Functions

abstract:
  We have obtained a determinant representation for the time- and
temperature-dependent field-field correlation function of the impenetrable
Lieb-Liniger gas of anyons through direct summation of the form factors. In the
static case, the obtained results are shown to be equivalent to those that
follow from the anyonic generalization of Lenard's formula.

categories: cond-mat.stat-mech math-ph math.MP quant-ph


title:
Discovery of the Partially Eclipsing White Dwarf Binary SDSS
  J143547.87+373338.5

abstract:
  We have discovered a partially eclipsing white dwarf, low-mass M dwarf binary
(3 hour 54.41 second orbital period), SDSS J143547.87+373338.5, from May 2007
observations at the WIYN telescope. Here we present blue band photometry of
three eclipses. Eclipse fitting gives main sequence solutions to the M dwarf
companion of $M_S=0.15-0.35 M_{\odot}$ and $R_S=0.17-0.32 R_{\odot}$. Analysis
of the SDSS spectrum constrains the M dwarf further to be of type M4-M6 with
$M_S=0.11-0.20 M_{\odot}$. Once full radial velocity curves are measured, high
precision determinations of the masses and radii of both components will be
easily obtained without any knowledge of stellar structure or evolution. ZZ
Ceti pulsations from the white dwarf were not found at our 4 mmag detection
limit.


title: Sum-rules for Raman scattering off strongly correlated electron systems

abstract:
  We investigate sum-rules applying to the Raman intensity in a strongly
correlated system close to the Mott transition. Quite generally, it can be
shown that, provided the frequency integration is performed up to a cutoff
smaller than the upper Hubbard band, a sum-rule applies to the non-resonant
Raman signal of a doped Mott insulator, resulting in an integrated intensity
which is proportional to the doping level. We provide a detailed derivation of
this sum-rule for the t-J model, for which the frequency cutoff can be taken to
infinity and an unrestricted sum-rule applies. A quantitative analysis of the
sum-rule is also presented for the d-wave superconducting phase of the t-J
model, using slave boson methods. The case of the Hubbard model is studied in
the framework of dynamical mean-field theory, with special attention to the
cutoff dependence of the restricted sum-rule, and also to the intermediate
coupling regime. The sum-rule investigated here is shown to be consistent with
recent experimental data on cuprate superconductors, reporting measurements of
Raman scattering intensities on an absolute scale.


title: Polymer translocation through pores with complex geometries

abstract:
  We propose a method for the theoretical investigation of polymer
translocation through composite pore structures possessing arbitrarily
specified geometries. Translocation through each constituent part of the
composite is treated as being analogous to the diffusion of the translocation
coordinate over the free energy landscape derived from the chain configurations
within the pore. The proposed method accounts for possible reverse motions of
the leading chain end at the interface between constituent parts of a composite
pore, a possibility that has been neglected in prior studies. As an
illustration of our method, we study the translocation of a Gaussian chain
between two spherical compartments connected by a cylindrical pore, and by a
composite pore consisting of two connected cylinders of different diameters,
which is structurally similar to the $\alpha$-hemolysin membrane channel. We
demonstrate that reverse chain motions between the pore constituents may
contribute significantly to the total translocation time. Our results further
establish that translocation through a two-cylinder composite pore is faster
when the chain is introduced into the pore on the cis (wide) side of the
channel rather than the trans (narrow) side.


title: A Sequence of Degree One Vassiliev Invariants for Virtual Knots

abstract:
  For ordinary knots in R3, there are no degree one Vassiliev invariants. For
virtual knots, however, the space of degree one Vassiliev invariants is
infinite dimensional. We introduce a sequence of three degree one Vassiliev
invariants of virtual knots of increasing strength. We demonstrate that the
strongest invariant is a universal Vassiliev invariant of degree one for
virtual knots in the sense that any other degree one Vassiliev invariant can be
recovered from it by a certain natural construction. To prove these results, we
extend the based matrix invariant introduced by Turaev for virtual strings to
the class of singular virtual knots with one double-point.


title: Toeplitz Block Matrices in Compressed Sensing

abstract:
  Recent work in compressed sensing theory shows that $n\times N$ independent
and identically distributed (IID) sensing matrices whose entries are drawn
independently from certain probability distributions guarantee exact recovery
of a sparse signal with high probability even if $n\ll N$. Motivated by signal
processing applications, random filtering with Toeplitz sensing matrices whose
elements are drawn from the same distributions were considered and shown to
also be sufficient to recover a sparse signal from reduced samples exactly with
high probability. This paper considers Toeplitz block matrices as sensing
matrices. They naturally arise in multichannel and multidimensional filtering
applications and include Toeplitz matrices as special cases. It is shown that
the probability of exact reconstruction is also high. Their performance is
validated using simulations.


title: A Fractionalized Quantum Spin Hall Effect

abstract:
  Effects of electron correlations on a two dimensional quantum spin Hall (QSH)
system are studied. We examine possible phases of a generalized Hubbard model
on a bilayer honeycomb lattice with a spin-orbit coupling and short range
electron-electron repulsions at half filling, based on the slave rotor
mean-field theory. Besides the conventional QSH phase and a broken-symmetry
insulating phase, we find a new phase, a fractionalized quantum spin Hall
phase, where the QSH effect arises for fractionalized spinons which carry only
spin but not charge. Experimental manifestations of the exotic phase and
effects of fluctuations beyond the saddle point approximation are also
discussed.


title:
Unifying several separability conditions using the covariance matrix
  criterion

abstract:
  We present a framework for deciding whether a quantum state is separable or
entangled using covariance matrices of locally measurable observables. This
leads to the covariance matrix criterion as a general separability criterion.
We demonstrate that this criterion allows to detect many states where the
familiar criterion of the positivity of the partial transpose fails. It turns
out that a large number of criteria which have been proposed to complement the
positive partial transpose criterion - the computable cross norm or realignment
criterion, the criterion based on local uncertainty relations, criteria derived
from extensions of the realignment map, and others - are in fact a corollary of
the covariance matrix criterion.


title: Fibered Transverse Knots and the Bennequin Bound

abstract:
  We prove that a nicely fibered link (by which we mean the binding of an open
book) in a tight contact manifold $(M,\xi)$ with zero Giroux torsion has a
transverse representative realizing the Bennequin bound if and only if the
contact structure it supports (since it is also the binding of an open book) is
$\xi.$ This gives a geometric reason for the non-sharpness of the Bennequin
bound for fibered links. We also note that this allows the classification, up
to contactomorphism, of maximal self-linking number links in these knot types.
Moreover, in the standard tight contact structure on $S^3$ we classify, up to
transverse isotopy, transverse knots with maximal self-linking number in the
knots types given as closures of positive braids and given as fibered strongly
quasi-positive knots. We derive several braid theoretic corollaries from this.
In particular. we give conditions under which quasi-postitive braids are
related by positive Markov stabilizations and when a minimal braid index
representative of a knot is quasi-positive.
  In the new version we also prove that our main result can be used to show,
and make rigorous the statement, that contact structures on a given manifold
are in a strong sense classified by the transverse knot theory they support.


title: Mesons versus quasi-normal modes: undercooling and overheating

abstract:
  In holographic models of gauge theories with matter, there generically exists
a first order phase transition in which mesons dissociate. We perform a careful
analysis of the meson and quasi-particle spectra in the overheated resp.
undercooled regimes close to the junction of the two phases. We show that all
overheated finite meson masses eventually become infinitely degenerate, which
implies that any connection to the quasi-particle spectrum is more subtle than
previously suggested. For the Sakai-Sugimoto model no smooth connection between
these spectra is possible.


title:
Phase transitions, entanglement and quantum noise interferometry in cold
  atoms

abstract:
  We show that entanglement monotones can characterize the pronounced
enhancement of entanglement at a quantum phase transition if they are sensitive
to long-range high order correlations. These monotones are found to develop a
sharp peak at the critical point and to exhibit universal scaling. We
demonstrate that similar features are shared by noise correlations and verify
that these experimentally accessible quantities indeed encode entanglement
information and probe separability.


title: Detection of X-ray Emission from the Very Old Pulsar J0108-1431

abstract:
  PSR J0108-1431 is a nearby, 170 Myr old, very faint radio pulsar near the
"pulsar death line" in the P-Pdot diagram. We observed the pulsar field with
the Chandra X-ray Observatory and detected a point source (53 counts in a 30 ks
exposure, energy flux (9+/-2)\times 10^{-15} ergs cm^{-2} s^{-1} in the 0.3-8
keV band) close to the radio pulsar position. Based on the large X-ray/optical
flux ratio at the X-ray source position, we conclude that the source is the
X-ray counterpart of PSR J0108-1431.The pulsar spectrum can be described by a
power-law model with photon index Gamma \approx 2.2 and luminosity L_{0.3-8
keV} \sim 2\times 10^{28} d_{130}^2 ergs s^{-1}, or by a blackbody model with
the temperature kT\approx 0.28 keV and bolometric luminosity L_{bol} \sim
1.3\times 10^{28} d_{130}^2 ergs s^{-1}, for a plausible hydrogen column
density NH = 7.3\times 10^{19} cm^{-2} (d_{130}=d/130 pc). The pulsar converts
\sim 0.4% of its spin-down power into the X-ray luminosity, i.e., its X-ray
efficiency is higher than for most younger pulsars. From the comparison of the
X-ray position with the previously measured radio positions, we estimated the
pulsar proper motion of 0.2 arcsec yr^{-1} (V_\perp \sim 130 d_{130} km
s^{-1}), in the south-southeast direction.


title: Eisenstein cohomology for congruence subgroups of SO(n,2)

abstract:
  The automorphic cohomology of a connected reductive algebraic group defined
over Q decomposes as a direct algebraic sum of cuspidal and Eisenstein
cohomology. In the present paper we construct regular Eisenstein cohomology
classes for congruence subgroups of a rational form G of Q-rank 2 of SO(n,2).


title:
The Multiwavelength Survey by Yale-Chile (MUSYC): Wide K-band Imaging,
  Photometric Catalogs, Clustering and Physical Properties of Galaxies at z~2

abstract:
  We present K-band imaging of two ~30'x30' fields covered by the MUSYC Wide
NIR Survey. The 1030 and 1255 fields were imaged with ISPI on the 4m Blanco
telescope at CTIO to a 5 sigma point-source limiting depth of K~20 (Vega).
Combining this data with the MUSYC Optical UBVRIz imaging, we created
multi-band K-selected source catalogs for both fields. These catalogs, together
with the MUSYC K-band catalog of the ECDF-S field, were used to select K<20 BzK
galaxies over an area of 0.71 deg^2. This is the largest area ever surveyed for
BzK galaxies. We present number counts, redshift distributions and stellar
masses for our sample of 3261 BzK galaxies (2502 star-forming (sBzK) and 759
passively evolving (pBzK)), as well as reddening and star formation rate
estimates for the star-forming BzK systems. We also present 2-point angular
correlation functions and spatial correlation lengths for both sBzK and pBzK
galaxies and show that previous estimates of the correlation function of these
galaxies were affected by cosmic variance due to the small areas surveyed. We
have measured correlation lengths r_0 of 8.89+/-2.03 Mpc and 10.82+/-1.72 Mpc
for sBzK and pBzK galaxies respectively. This is the first reported measurement
of the spatial correlation function of passive BzK galaxies. In the LambdaCDM
scenario of galaxy formation, these correlation lengths at z~2 translate into
minimum masses of ~4x10^{12} M_sun and ~9x10^{12} M_sun for the dark matter
(DM) halos hosting sBzK and pBzK galaxies respectively. The clustering
properties of the galaxies in our sample are consistent with them being the
descendants of bright LBG at z~3, and the progenitors of present-day >1L*
galaxies.


title: Asymmetric and Symmetric Subsystem BCH Codes and Beyond

abstract:
  Recently, the theory of quantum error control codes has been extended to
subsystem codes over symmetric and asymmetric quantum channels -- qubit-flip
and phase-shift errors may have equal or different probabilities. Previous work
in constructing quantum error control codes has focused on code constructions
for symmetric quantum channels. In this paper, we develop a theory and
establish the connection between asymmetric quantum codes and subsystem codes.
We present families of subsystem and asymmetric quantum codes derived, once
again, from classical BCH and RS codes over finite fields. Particularly, we
derive an interesting asymmetric and symmetric subsystem codes based on
classical BCH codes with parameters $[[n,k,r,d]]_q$, $[[n,k,r,d_z/d_x]]_q$ and
$[[n,k',0,d_z/d_x]]_q$ for arbitrary values of code lengths and dimensions. We
establish asymmetric Singleton and Hamming bounds on asymmetric quantum and
subsystem code parameters; and derive optimal asymmetric MDS subsystem codes.
Finally, our constructions are well explained by an illustrative example.
  This paper is written on the occasion of the 50th anniversary of the
discovery of classical BCH codes and their quantum counterparts were derived
nearly 10 years ago.


title: Testing a U(1) Solution to the Mu Problem

abstract:
  We discuss the collider phenomenology of TeV Z' gauge bosons related to the
absence of a bare mu-term in the superpotential. Decays of the type Z' -->
Higgsinos can directly test whether a gauge symmetry is responsible for
forbidding the Higgsino mass. Decays to multi-lepton final states may allow
these signatures to be observed at the Large Hadron Collider. We comment on
whether it will be possible to state definitively that the mu-term is forbidden
via a gauge symmetry.


title:
Quantum computation in semiconductor quantum dots of electron-spin
  asymmetric anisotropic exchange

abstract:
  The universal quantum computation is obtained when there exists asymmetric
anisotropic exchange between electron spins in coupled semiconductor quantum
dots. The asymmetric Heisenberg model can be transformed into the isotropic
model through the control of two local unitary rotations for the realization of
essential quantum gates. The rotations on each qubit are symmetrical and depend
on the strength and orientation of asymmetric exchange. The implementation of
the axially symmetric local magnetic fields can assist the construction of
quantum logic gates in anisotropic coupled quantum dots. This proposal can
efficiently use each physical electron spin as a logical qubit in the universal
quantum computation.


title: Swap Action in a Solid-State Controllable Anisotropic Heisenberg Model

abstract:
  Correct swap action can be realized via the control of the anisotropic
Heisenberg interaction in solid-state quantum systems. The conditions of
performing a swap are derived by the dynamics of arbitrary bipartite pure
state. It is found that swap errors can be eliminated in the presence of
symmetric anisotropy. In realistic quantum computers with unavoidable
fluctuations, the gate fidelity of swap action is estimated. The scheme of
quantum computation via the anisotropic Heisenberg interaction is implemented
in a one dimensional quantum dots. The slanting and static magnetic field can
be used to adjust the anisotropy.


title: Quantum information processing in a spin-bus system of coupled chains

abstract:
  The effective Heisenberg interaction of long distance is constructed in spin
qubits connected to a bus of two strongly coupled chains. Universal quantum
computation can be realized on the basis of the bus which always keeps frozen
at the ground state. It is found that the effective interaction is primarily
determined by the energy spectra of the bus. With the variation of the distance
between two connecting nodes, the interaction alternately occurs between
antiferromagnetic and ferromagnetic ones. The long range interaction can also
be attained in coupled infinite chains. The quantum gate operations with the
high precision are implemented in the condition of quantum fluctuations.


title: Entanglement in a hardcore-boson Hubbard model

abstract:
  The entanglement in a Hubbard chain of hardcore bosons is investigated. The
analytic expression of the global entanglement in ground state is derived. The
divergence of the derivative of the global entanglement shows the quantum
criticality of the ground state. For the thermal equilibrium state, the
bipartite and the multipartite entanglement are evaluated. The entanglement
decreases to zero at a certain temperature. The thermal entanglement is rapidly
decreasing with the increase of the number of sites in the lattice. The
bipartite thermal entanglement approaches a constant value at a certain number
of sites while the multipartite entanglement eventually vanishes.


title: Entanglement in a Dimerized Antiferromagnetic Heisenberg Chain

abstract:
  The entanglement properties in an antiferromagnetic dimerized Heisenberg
spin-1/2 chain are investigated. The entanglement gap, which is the difference
between the ground-state energy and the minimal energy that any separable state
can attain, is calculated to detect the entanglement. It is found that the
entanglement gap can be increased by varying the alternation parameter. Through
thermal energy, the witness of the entanglement can determine a characteristic
temperature below that an entangled state can be obtained. The entanglement
detected by the energy can provide a lower bound for that determined by the
concurrence. If the alternation parameter is smaller than a critical value,
there is always no inter-dimer entanglement in the chain.


title: Entanglement and purity of single- and two-photon states

abstract:
  Whereas single- and two-photon wave packets are usually treated as pure
states, in practice they will be mixed. We study how entanglement created with
mixed photon wave packets is degraded. We find in particular that the
entanglement of a delocalized single-photon state of the electro-magnetic field
is determined simply by its purity. We also discuss entanglement for two-photon
mixed states, as well as the influence of a vacuum component.


title:
Measurement of the tau -> 3pi eta nu Branching Fraction and a Search for
  a Second-Class Current in the tau -> eta'(958) pi nu Decay

abstract:
  The "\tau\to 3\pi\eta\nu" decay with the "\eta \to \gamma\gamma" mode is
studied using 384 fb^-1 of data collected by the BaBar detector. The branching
fraction is measured to be (1.60+/-0.05+/-0.11)x10^-4. It is found that "\tau
\to f1 \pi \nu to 3\pi \eta \nu" is the dominant decay mode with a branching
fraction of (1.11+/-0.06+/-0.05)x10^-4. The first error on the branching
fractions is statistical and the second systematic. In addition, a 90%
confidence level upper limit on the branching fraction of the "\tau \to
\eta'(958) \pi \nu" decay is measured to be 7.2x10^-6. This last decay proceeds
through a second-class current and is expected to be forbidden in the limit of
isospin symmetry.


title:
Further Constraints on the Presence of a Debris Disk in the Multiplanet
  System Gliese 876

abstract:
  Using both the Very Large Array (VLA) at 7mm wavelength, and the Australia
Telescope Compact Array (ATCA) at 3mm, we have searched for microwave emission
from from cool dust in the extrasolar planetary system Gliese 876 (Gl 876).
Having detected no emission above our 3-sigma detection threshold of 135
microJy, we rule out any dust disk with either a mass greater than 0.0006 Earth
masses or less than ~250 AU across. This result improves on previous detection
aperture thresholds an order of magnitude greater, and it has some implications
for the dynamical modeling of the system. It also is consistent with the
Greaves et al. hypothesis that relates the presence of a debris disk to
close-in planets. Due to the dust-planetesimal relationship, our null result
may also provide a constraint on the population or composition of the dust and
small bodies around this nearby M dwarf.


title:
Tunable Aharonov-Anandan phase in transport through mesoscopic hole
  rings

abstract:
  We present a theoretical study of spin-3/2 hole transport through mesoscopic
rings, based on the spherical Luttinger model. The quasi-one-dimensional ring
is created in a symmetric two-dimensional quantum well by a singular-oscillator
potential for the radial in-plane coordinate. The quantum-interference
contribution to the two-terminal ring conductance exhibits an energy-dependent
Aharonov-Anandan phase, even though Rashba and Dresselhaus spin splittings are
absent. Instead, confinement-induced heavy-hole - light-hole mixing is found to
be the origin of this phase, which has ramifications for magneto-transport
measurements in gated hole rings.


title: Generalized Frobenius Algebras and the Theory of Hopf Algebras

abstract:
  "Co-Frobenius" coalgebras were introduced as dualizations of Frobenius
algebras. Recently, it was shown in \cite{I} that they admit left-right
symmetric characterizations analogue to those of Frobenius algebras: a
coalgebra $C$ is co-Frobenius if and only if it is isomorphic to its rational
dual. We consider the more general quasi-co-Frobenius (QcF) coalgebras; in the
first main result we show that these also admit symmetric characterizations: a
coalgebra is QcF if it is weakly isomorphic to its (left, or equivalently
right) rational dual $Rat(C^*)$, in the sense that certain coproduct or product
powers of these objects are isomorphic. These show that QcF coalgebras can be
viewed as generalizations of both co-Frobenius coalgebras and Frobenius
algebras. Surprisingly, these turn out to have many applications to fundamental
results of Hopf algebras. The equivalent characterizations of Hopf algebras
with left (or right) nonzero integrals as left (or right) co-Frobenius, or QcF,
or semiperfect or with nonzero rational dual all follow immediately from these
results. Also, the celebrated uniqueness of integrals follows at the same time
as just another equivalent statement. Moreover, as a by-product of our methods,
we observe a short proof for the bijectivity of the antipode of a Hopf algebra
with nonzero integral. This gives a purely representation theoretic approach to
many of the basic fundamental results in the theory of Hopf algebras.


title: Cavity optomechanical coupling assisted by an atomic gas

abstract:
  We theoretically study a cavity filled with atoms, which provides the
optical-mechanical interaction between the modified cavity photonic field and a
movable mirror at one end. We show that the cavity field ``dresses'' these
atoms, producing two types of polaritons, effectively enhancing the radiation
pressure of the cavity field upon the end mirror, as well as establishing an
additional squeezing mode of the end mirror. This squeezing produces an
adiabatic entanglement, which is absent in usual vacuum cavities, between the
oscillating mirror and the rest of the system. We analyze the entanglement and
quantify it using the Loschmidt echo and fidelity.


title:
Complex phase mixture and domain superstructure across a new lead-free
  ferroelectric/anti-ferroelectric morphotropic phase boundary

abstract:
  We investigate the microstructural evolution in a ferroelectric to
antiferroelectric phase transition at the morphotropic phase boundary in the
Bi(1-x)SmxFeO3 system. Continuous Sm3+ substitution on the A-site induces
short-range anti-parallel cation displacements as verified by the appearance of
localized 1/4(110) weak spots in selected area electron diffraction patterns
for 0.1<x<0.14 samples, and thus onset of antiferroelectricity. Kinetic Monte
Carlo simulations confirm that increasing the strength of the anti-parallel
interactions (i.e. increasing x) induces a ferroelectric to antiferroelectric
transition. For 0.14<x<0.2 antiphase oxygen octahedra tilts induce complete
antiferroelectricity.


title: Constant-Rank Codes

abstract:
  Constant-dimension codes have recently received attention due to their
significance to error control in noncoherent random network coding. In this
paper, we show that constant-rank codes are closely related to
constant-dimension codes and we study the properties of constant-rank codes. We
first introduce a relation between vectors in $\mathrm{GF}(q^m)^n$ and
subspaces of $\mathrm{GF}(q)^m$ or $\mathrm{GF}(q)^n$, and use it to establish
a relation between constant-rank codes and constant-dimension codes. We then
derive bounds on the maximum cardinality of constant-rank codes with given rank
weight and minimum rank distance. Finally, we investigate the asymptotic
behavior of the maximal cardinality of constant-rank codes with given rank
weight and minimum rank distance.


title: Ultimate Energy Densities for Electromagnetic Pulses

abstract:
  The ultimate electric and magnetic energy densities that can be attained by
bandlimited electromagnetic pulses in free space are calculated using an ab
initio quantized treatment, and the quantum states of electromagnetic fields
that achieve the ultimate energy densities are derived. The ultimate energy
densities also provide an experimentally accessible metric for the degree of
localization of polychromatic photons.


title:
Random Sierpinski network with scale-free small-world and modular
  structure

abstract:
  In this paper, we define a stochastic Sierpinski gasket, on the basis of
which we construct a network called random Sierpinski network (RSN). We
investigate analytically or numerically the statistical characteristics of RSN.
The obtained results reveal that the properties of RSN is particularly rich, it
is simultaneously scale-free, small-world, uncorrelated, modular, and maximal
planar. All obtained analytical predictions are successfully contrasted with
extensive numerical simulations. Our network representation method could be
applied to study the complexity of some real systems in biological and
information fields.


title:
The Imprints of IMBHs on the Structure of Globular Clusters: Monte-Carlo
  Simulations

abstract:
  We present the first results of a series of Monte-Carlo simulations
investigating the imprint of a central black hole on the core structure of a
globular cluster. We investigate the three-dimensional and the projected
density profile of the inner regions of idealized as well as more realistic
globular cluster models, taking into account a stellar mass spectrum, stellar
evolution and allowing for a larger, more realistic, number of stars than was
previously possible with direct N-body methods. We compare our results to other
N-body simulations published previously in the literature.


title:
A statistic on the roots of a finite reflection group and a
  correspondence between the height function and Bruhat order

abstract:
  The action of a finite reflection group (type A) on its set of roots is
understood as a permutation representation or group action. We show that this
representation is an induced representation from a certain kind of parabolic
subgroup. Furthermore, we use this representation to define a statistic
(derived from the length function) on the set of roots. A possible application
to Costas Arrays is hinted at in a proposition.


title: The Rank of the Covariance Matrix of an Evanescent Field

abstract:
  Evanescent random fields arise as a component of the 2-D Wold decomposition
of homogenous random fields. Besides their theoretical importance, evanescent
random fields have a number of practical applications, such as in modeling the
observed signal in the space time adaptive processing (STAP) of airborne radar
data. In this paper we derive an expression for the rank of the low-rank
covariance matrix of a finite dimension sample from an evanescent random field.
It is shown that the rank of this covariance matrix is completely determined by
the evanescent field spectral support parameters, alone. Thus, the problem of
estimating the rank lends itself to a solution that avoids the need to estimate
the rank from the sample covariance matrix. We show that this result can be
immediately applied to considerably simplify the estimation of the rank of the
interference covariance matrix in the STAP problem.


title:
Mutual Absolute Continuity of Harmonic and Surface Measures for
  Hormander Type Operators

abstract:
  In this paper, we consider the Sub-Laplacian L which consists of sum of
squares of smooth vector fields that satisfy Hormander's finite rank condition.
We study the Dirichlet problem for this operator on domains that satisfy
certain geometric conditions. For such domains, several key results are
established. These results consist of 1) A reversed Holder inequality for the
Poisson kernel 2) Harmonic measure (corresponding to L) and surface measure (as
well as the H-Perimeter measure) are mutually absolutely continuous 3) A
representation (hence solvability of the Dirichlet problem) for solutions to
the Dirichlet problem.


title:
Integrable Boundary Conditions and W-Extended Fusion in the Logarithmic
  Minimal Models LM(1,p)

abstract:
  We consider the logarithmic minimal models LM(1,p) as `rational' logarithmic
conformal field theories with extended W symmetry. To make contact with the
extended picture starting from the lattice, we identify 4p-2 boundary
conditions as specific limits of integrable boundary conditions of the
underlying Yang-Baxter integrable lattice models. Specifically, we identify 2p
integrable boundary conditions to match the 2p known irreducible
W-representations. These 2p extended representations naturally decompose into
infinite sums of the irreducible Virasoro representations (r,s). A further 2p-2
reducible yet indecomposable W-representations of rank 2 are generated by
fusion and these decompose as infinite sums of indecomposable rank-2 Virasoro
representations. The fusion rules in the extended picture are deduced from the
known fusion rules for the Virasoro representations of LM(1,p) and are found to
be in agreement with previous works. The closure of the fusion algebra on a
finite number of representations in the extended picture is remarkable
confirmation of the consistency of the lattice approach.


title:
On the independent points in the sky for the search of periodic
  gravitational wave

abstract:
  We investigate the independent points in the sky require to search the
periodic gravitational wave, assuming the noise power spectral density to be
flat. We have made an analysis with different initial azimuth of the Earth for
a week data set. The analysis shows significant difference in the independent
points in the sky for the search. We numerically obtain an approximate relation
to make trade-off between computational cost and sensitivities. We also discuss
the feasibility of the coherent search in small frequency band in reference to
advanced LIGO.


title:
Avoiding the uncertainty from correlation between |Delta m_{31}^2| and
  CP phase delta in nu_mu --> nu_mu long baseline experiments

abstract:
  We introduce a new index I_{Delta m_{31}^2} to find where is the better setup
of the baseline length and energy to avoid as well as possible the uncertainty
from the correlation between Delta m_{31}^2 and cos(delta) in nu_mu --> nu_mu
long baseline experiments.


title: Composition of Haar Paraproducts: The Random Case

abstract:
  When is the composition of paraproducts bounded? This is an important, and
difficult question, related to to a question of Sarason on composition of
Hankel matrices, and the two-weight problem for the Hilbert transform. We
consider randomized variants of this question, finding non-classical
characterizations, for dyadic paraproducts.


title: The superkinetic and interacting terms of Chiralsuperfields

abstract:
  In this paper, we achieve some interesting results in the way to make sense
how superparticles interact together and to ordinary particles by means of
putting aside the dimensional constraints. This is the first step in the
process of constructing an effective model taking binding possibilities of
superparticles into account.


title:
Optical Stark decelerator for cw molecular beam with a quasi-cw
  semi-Gaussian laser beam

abstract:
  We propose a promising scheme to decelerate a cw filtering out molecular beam
using a red-detuned quasi-cw semi-Gaussian laser beam. By using Monte-Carlo
simulation method, we demonstrate this optical Stark deceleration scheme, and
study its decelerated dynamic process for a cw ND3 molecular beam as well as
the dependence of the deceleration effect on the border width of the
semi-Gaussian beam. Our study shows that the proposed scheme can be used to
efficiently slow a cw ND3 molecular beam, and obtain a relative average
kinetic-energy loss of 9.33% by using a single semi-Gaussian beam with a well
depth of 7.3 mK.


title: Stimulated Raman adiabatic passage in a multi-level atom

abstract:
  We present a general formalism for describing stimulated Raman adiabatic
passage in a multi-level atom. The atom is assumed to have two ground state
manifolds a and b and an excited state manifold e, and the adiabatic passage is
carried out by resonantly driving the a-e and b-e transitions with
time-dependent fields. Our formalism gives a complete description of the
adiabatic passage process, and can be applied to systems with arbitrary numbers
of degenerate states in each manifold and arbitrary couplings of the a-e and
b-e transitions. We illustrate the formalism by applying it to both a simple
toy model and to adiabatic passage in the Cesium atom.


title: Incremental Topological Ordering and Strong Component Maintenance

abstract:
  We present an on-line algorithm for maintaining a topological order of a
directed acyclic graph as arcs are added, and detecting a cycle when one is
created. Our algorithm takes O(m^{1/2}) amortized time per arc, where m is the
total number of arcs. For sparse graphs, this bound improves the best previous
bound by a logarithmic factor and is tight to within a constant factor for a
natural class of algorithms that includes all the existing ones. Our main
insight is that the bidirectional search method of previous algorithms does not
require an ordered search, but can be more general. This allows us to avoid the
use of heaps (priority queues) entirely. Instead, the deterministic version of
our algorithm uses (approximate) median-finding. The randomized version of our
algorithm avoids this complication, making it very simple. We extend our
topological ordering algorithm to give the first detailed algorithm for
maintaining the strong components of a directed graph, and a topological order
of these components, as arcs are added. This extension also has an amortized
time bound of O(m^{1/2}) per arc.


title: Absolute Branching Fractions of Cabibbo-Suppressed D --> K Kbar Decays

abstract:
  Using 281/pb of data collected with the CLEO-c detector at the psi(3770)
resonance, we have studied Cabibbo-suppressed decays of D mesons to final
states with two kaons. We present results for the absolute branching fractions
of the modes D^0 --> K^+ K^-, D^0 --> K^0_S K^0_S, and D^+ --> K^+ K^0_S. We
measure B(D^0 --> K^+ K^-) = (4.08 +- 0.08 +- 0.09) x 10^-3, B(D^0 --> K^0_S
K^0_S) = (1.46 +- 0.32 +- 0.09) x 10^-4, and B(D^+ --> K^+ K^0_S) = (3.14 +-
0.09 +- 0.08) x 10^-3. We also determine the ratio B(D^0 --> K^+ K^-)/B(D^0 -->
pi^+ pi^-) = 2.89 +- 0.05 +- 0.06. For each measurement, the first uncertainty
is statistical and the second uncertainty is systematic.


title:
The Renormalization Group Studies on Four Fermion Interaction
  Instabilities on Algebraic Spin Liquids

abstract:
  We study the instabilities caused by four fermion interactions on algebraic
spin liquids. Renormalization group (RG) is used for three types of previously
proposed spin liquids on the square lattice: the staggered flux state of SU(2)
spin system, the $\pi-$flux state of SU(4) spin system, and the $\pi-$flux
state of SU(2) spin system. The low energy field theories of the first two
types of spin liquids are QED3 with emerged SU(4) and SU(8) flavor symmetries,
the low energy theory of the $\pi-$flux SU(2) spin liquid is the QCD3 with
SU(2) gauge field and emergent Sp(4) (SO(5)) flavor symmetry. Suitable large-N
generalization of these spin liquids are discussed, and a systematic 1/N
expansion is applied to the RG calculations. The most relevant four fermion
perturbations are identified, and the possible phases driven by relevant
perturbations are discussed.


title:
Pinning Enhancement by Heterovalent Substitution in
  Y$_{1-x}$RE$_{x}$Ba$_{2}$Cu$_{3}$O$_{7-\delta}$

abstract:
  The intragrain pinning in high-$T_c$ superconductor compounds
Y$_{1-x}$RE$_{x}$Ba$_{2}$Cu$_{3}$O$_{7-\delta}$ with low concentration of RE
(La, Ce, Pr) was investigated. Magnetic and transport measurements reveal that
the pinning is maximal for the concentration of heterovalent RE such that the
average distance between the impurity ions in the plane of rare-earth elements
close to the diameter of Abrikosov vortices in YBCO.


title: Soft supersymmetry breaking terms from D4 x Z2 lepton flavor symmetry

abstract:
  We study the supersymmetric model with $D_4 \times Z_2$ lepton flavor
symmetry. We evaluate soft supersymmetry breaking terms, i.e. soft slepton
masses and A-terms, which are predicted in the $D_4$ flavor model. We consider
constraints due to experiments of flavor changing neutral current processes.


title:
Full QCD calculation of neutron electric dipole moment with the external
  electric field method

abstract:
  We have calculated the neutron electric dipole moment (NEDM) in the presence
of the CP violating $\theta$ term in lattice QCD with 2-flavor dynamical clover
quarks, using the external electric field method. Accumulating a large number
of statistics by the averages over 16 different source points and over forward
and backward nucleon propagators, we have obtained non-zero signals of neutron
and proton EDM beyond one standard deviation at each quark mass in full QCD. We
have investigated the quark mass dependence of nucleon EDM in full QCD, and
have found that nucleon EDM in full QCD does not decrease toward the chiral
limit, as opposed to the theoretical expectation. We briefly discuss possible
reasons for this behavior.


title: D-instanton derivation of multi-fermion F-terms in supersymmetric QCD

abstract:
  We investigate effects of field theory instantons by considering D-instantons
in a suitable D3-brane background. In supersymmetric QCD with SU(N_c) gauge
group with N_f=N_c flavors, the moduli space of vacua is deformed by
instantons. This effect can be described by the chiral interactions which are
called multi-fermion F-terms. We derive these chiral interaction terms as
D-instanton effects in the presence of D3-branes. For SU(2), the obtained
result agrees with the previous result worked out by Beasley and Witten
[hep-th/0409149]. We also explicitly work out those for the case of the
symplectic gauge group, and show that they describe the deformation of the
moduli space.


title:
Transitions between distinct compaction regimes in complexes of
  multivalent cationic lipids and DNA

abstract:
  We use X-ray scattering and molecular simulations to investigate the
structural properties of complexes of multivalent cationic lipids and DNA
molecules. At low mole fraction of neutral lipids (NLs), $\Phi_{\rm NL}$, the
complexes show dramatic DNA compaction down to essentially close packed DNA
arrays with a DNA interaxial spacing $d_{\rm DNA}=25\AA$. A gradual increase in
$\Phi_{\rm NL}$ does not lead to a continuous increase in $d_{\rm DNA}$ as
observed for DNA complexes of monovalent cationic lipids (CLs). Instead,
distinct spacing regimes exist, with sharp transitions between them. Three
packing states have been identified: (i) close packed, (ii) condensed, but not
close packed, with $d_{\rm DNA}=27-28\AA$, and (iii) an expanded state, where
$d_{\rm DNA}$ increases gradually with $\Phi_{\rm NL}$. Based on our
experimental and computational results, we conclude that the DNA condensation
is mediated by the multivalent cationic lipids, which assemble between the
negatively charged DNA rods. Quite remarkably, the computational results show
that the less tightly packed structure in regime (ii) is thermodynamically more
stable than the close packed structure in regime (i). Accordingly, the constant
DNA spacing observed in regime (ii) is attributed to lateral phase coexistence
between this stable CL-DNA complex and neutral membranes. This finding may
explain the reduced transfection efficiency measured for such complexes:
Transfection involves endosomal escape and disassembly of the complex, and
these processes are inhibited by the high thermodynamic stability. Our results,
which demonstrate the existence of an inverse correlation between the stability
and transfection activity of lamellar CL-DNA complexes are, therefore,
consistent with a recently proposed model of cellular entry.


title:
A criteria for correct solvability in L_p(R) of a general
  Sturm-Liouville equation

abstract:
  We give criteria for correct solvability in L_p(R) of a general
Sturm-Liouville equation


title: Singular Hylleraas three-electron integrals

abstract:
  Calculations of the leading quantum electrodynamics effects in few electron
systems involve singular matrix elements of the inter-electronic distances of
the form $1/r_i^3$ and $1/r_{ij}^3$. Integrals that result when the
nonrelativistic wave function is represented with a Hylleraas basis
representation are studied. Recursion relations for various powers of the
electron coordinates and the master integrals are derived in a form suited for
high precision numerical evaluations.


title:
Temporal Logic Patterns for Querying Dynamic Models of Cellular
  Interaction Networks

abstract:
  Models of the dynamics of cellular interaction networks have become
increasingly larger in recent years. Formal verification based on model
checking provides a powerful technology to keep up with this increase in scale
and complexity. The application of model-checking approaches is hampered,
however, by the difficulty for non-expert users to formulate appropriate
questions in temporal logic. In order to deal with this problem, we propose the
use of patterns, that is, high-level query templates that capture recurring
biological questions and that can be automatically translated into temporal
logic. The applicability of the developed set of patterns has been investigated
by the analysis of an extended model of the network of global regulators
controlling the carbon starvation response in Escherichia coli.


title:
Un Algorithme de Gestion des Adjacences bas\'e sur la Puissance du
  Signal

abstract:
  In this proposition, we present a link management technique for pro-active
routing protocols for ad-hoc networks. This new mechanism is based on signal
strength hence cross layer approach is used. The hysteresis mechanism provided
by OLSR is improved upon by using signal strength in combination with the hello
loss based hysteresis. The signal power is used to determine if the
link-quality is improving or deteriorating while packet losses are handled
through the hysteresis mechanism specified in OLSR RFC. This not only makes the
link management more robust but also helps in anticipating link breakages
thereby greatly improving the performance.


title: On periodic $p$-harmonic functions on Cayley tree

abstract:
  We show that any periodic with respect to normal subgroups (of the group
representation of the Cayley tree) of finite index $p$-harmonic function is a
constant. For some normal subgroups of infinite index we describe a class of
(non-constant) periodic $p$-harmonic functions. If $p\neq2$, the
$p$-harmonicity is non-linear, i.e., the linear combination of $p$-harmonic
functions need not be $p$-harmonic. In spite of this, we show that linear
combinations of the $p$-harmonic functions described for normal subgroups of
infinite index are also $p$-harmonic.


title:
Morphological evidence for azimuthal variations of the cosmic ray ion
  acceleration at the blast wave of SN 1006

abstract:
  Using radio, X-ray and optical observations, we present evidence for
morphological changes due to efficient cosmic ray ion acceleration in the
structure of the southeastern region of the supernova remnant SN 1006. SN 1006
has an apparent bipolar morphology in both the radio and high-energy X-ray
synchrotron emission. In the optical, the shock front is clearly traced by a
filament of Balmer emission in the southeast. This optical emission enables us
to trace the location of the blast wave (BW) even in places where the
synchrotron emission from relativistic electrons is either absent or too weak
to detect. The contact discontinuity (CD) is traced using images in the
low-energy X-rays (oxygen band) which we argue reveals the distribution of
shocked ejecta. We interpret the azimuthal variations of the ratio of radii
between the BW and CD plus the X-ray and radio synchrotron emission at the BW
using CR-modified hydrodynamic models. We assumed different azimuthal profiles
for the injection rate of particles into the acceleration process, magnetic
field and level of turbulence. We found that the observations are consistent
with a model in which these parameters are all azimuthally varying, being
largest in the brightest regions.


title: Franck-Condon principle for heavy-quark hadron decays

abstract:
  The Franck-Condon principle governing molecular electronic transitions is
utilized to study heavy-quark hadron decays. This provides a direct assessment
of the wavefunction of the parent hadron if the momentum distribution of the
open-flavor decay products is measured. Model-independent results include an
experimental distinction between quarkonium and exotica (hybrids,
tetraquarks...), an off-plane correlator signature for tetraquarks and a direct
probe of the sea quark orbital wavefunction relevant in the discussion of 3S_1
or 3P_0 decay mechanisms.


title: Magnetic susceptibility of quark matter within Fermi-liquid theory

abstract:
  Possibility of spontaneous magnetization in QCD and magnetic properties of
quark matter is discussed by evaluating the magnetic susceptibility within
Fermi-liquid theory. The screening effects for gluons are taken into account to
figure out the specific properties of the magnetic transition in gauge
theories. It is shown that the static screening effect in terms of the Debye
mass does not necessarily work against the magnetic instability; it promotes
the instability, depending on the coupling constant and the number of flavors.


title: Two-photon transitions in primordial hydrogen recombination

abstract:
  The subject of cosmological hydrogen recombination has received much
attention recently because of its importance to predictions for and
cosmological constraints from CMB observations. While the central role of the
two-photon decay 2s->1s has been recognized for many decades, high-precision
calculations require us to consider two-photon decays from the higher states
ns,nd->1s (n>=3). Simple attempts to include these processes in recombination
calculations have suffered from physical problems associated with sequences of
one-photon decays, e.g. 3d->2p->1s, that technically also produce two photons.
These correspond to resonances in the two-photon spectrum that are optically
thick, necessitating a radiative transfer calculation. We derive the
appropriate equations, develop a numerical code to solve them, and verify the
results by finding agreement with analytic approximations to the radiative
transfer equation. The related processes of Raman scattering and two-photon
recombination are included using similar machinery. Our results show that early
in recombination the two-photon decays act to speed up recombination, reducing
the free electron abundance by 1.3% relative to the standard calculation at
z=1300. However we find that some photons between Ly-alpha and Ly-beta are
produced, mainly by 3d->1s two-photon decay and 2s->1s Raman scattering. At
later times these photons redshift down to Ly-alpha, excite hydrogen atoms, and
act to slow recombination. Thus the free electron abundance is increased by
1.3% relative to the standard calculation at z=900. The implied correction to
the CMB power spectrum is neligible for the recently released WMAP and ACBAR
data, but at Fisher matrix level will be 7 sigma for Planck. [ABRIDGED]


title: Radiative decay into $\gamma P$ of the low lying axial-vector mesons

abstract:
  We evaluate the radiative decay into a pseudoscalar meson and a photon of the
whole set of the axial-vector mesons dynamically generated from the
vector-pseudoscalar meson ($VP$) interaction. We take into account tree level
and loop diagrams coming from the axial-vector decay into a vector and a
pseudoscalar meson. We find a large span for the values of the radiative widths
of the different axial-vector mesons. In particular, we evaluate the radiative
decay into $K \gamma$ of the two $K_1(1270)$ states, recently claimed
theoretically, and discuss the experimental values quoted so far on the
assumption of only one state.


title: Field emission from single multi-wall carbon nanotubes

abstract:
  Electron field emission characteristics of individual multiwalled carbon
nanotubes have been investigated by a piezoelectric nanomanipulation system
operating inside a scanning electron microscopy chamber. The experimental setup
ensures a high control capability on the geometric parameters of the field
emission system (CNT length, diameter and anode-cathode distance). For several
multiwalled carbon nanotubes, reproducible and quite stable emission current
behaviour has been obtained with a dependence on the applied voltage well
described by a series resistance modified Fowler-Nordheim model. A turn-on
field of about 30 V/um and a field enhancement factor of around 100 at a
cathode-anode distance of the order of 1 um have been evaluated. Finally, the
effect of selective electron beam irradiation on the nanotube field emission
capabilities has been extensively investigated.


title: Subspace Pursuit for Compressive Sensing Signal Reconstruction

abstract:
  We propose a new method for reconstruction of sparse signals with and without
noisy perturbations, termed the subspace pursuit algorithm. The algorithm has
two important characteristics: low computational complexity, comparable to that
of orthogonal matching pursuit techniques when applied to very sparse signals,
and reconstruction accuracy of the same order as that of LP optimization
methods. The presented analysis shows that in the noiseless setting, the
proposed algorithm can exactly reconstruct arbitrary sparse signals provided
that the sensing matrix satisfies the restricted isometry property with a
constant parameter. In the noisy setting and in the case that the signal is not
exactly sparse, it can be shown that the mean squared error of the
reconstruction is upper bounded by constant multiples of the measurement and
signal perturbation energies.


title: Archimedean Type Conditions in Categories

abstract: Two concepts of being Archimedean are defined for arbitrary categories.


title:
Genuine SUSY signatures from $ug\to \tilde d \tchi_i^+$ and $ug \to d
  W^+$, at high energies

abstract:
  We analyze the quark-gluon induced process $u g\to \tilde d\tchi_i^+$,
including the one loop electroweak (EW) effects in the minimal supersymmetric
model (MSSM). This process is determined by four helicity amplitudes, three of
which are violating helicity conservation, and another one which respects it
and is logarithmically enhanced at high energy. Combining this $u g\to \tilde
d\tchi_i^+$ analysis with a corresponding one for $u g \to d W^+$, we obtain
simple approximate relations between the two processes, testing the MSSM
structure at the amplitude and the cross section levels. These relations become
exact at asymptotic energies and, provided the SUSY scale is not too heavy,
they may be approximately correct at LHC energies also. In addition to these,
we study the 1loop EW corrections to the inclusive $\tilde d\tchi_i^+$
production at LHC, presenting as examples, the $p_T$ and angular distributions.
Comparing these to the corresponding predictions for $W$+jet production derived
earlier, provides an accurate test of the supersymmetric assignments.


title:
Singularities in ground state fidelity and quantum phase transitions for
  the Kitaev model

abstract:
  The ground state fidelity per lattice site is shown to be able to detect
quantum phase transitions for the Kitaev model on the honeycomb lattice, a
prototypical example of quantum lattice systems with topological order. It is
found that, in the thermodynamic limit, the ground state fidelity per lattice
site is non-analytic at the phase boundaries: the second-order derivative of
its logarithmic function with respect to a control parameter describing the
interaction between neighboring spins is logarithmically divergent. A finite
size scaling analysis is performed, which allows us to extract the correlation
length critical exponent from the scaling behaviors of the ground state
fidelity per lattice site.


title: Semirelativistic potential model for three-gluon glueballs

abstract:
  The three-gluon glueball states are studied with the generalization of a
semirelativistic potential model giving good results for two-gluon glueballs.
The Hamiltonian depends only on 3 parameters fixed on two-gluon glueball
spectra: the strong coupling constant, the string tension, and a gluon size
which removes singularities in the potential. The Casimir scaling determines
the structure of the confinement. Our results are in good agreement with other
approaches and lattice calculation for the odderon trajectory but differ
strongly from lattice in the $J^{+-}$ sector. We propose a possible explanation
for this problem.


title: Inter-Layer Screening Length to Electric Field in Thin Graphite Film

abstract:
  Electric conduction in thin graphite film was tuned by two gate electrodes to
clarify how the gate electric field induces electric carriers in thin graphite.
The graphite was sandwiched between two gate electrodes arranged in a top and
bottom gate configuration. A scan of the top gate voltage generates a
resistance peak in ambiploar response. The ambipolar peak is shifted by the
bottom gate voltage, where the shift rate depends on the graphite thickness.
The thickness-dependent peak shift was clarified in terms of the inter-layer
screening length to the electric field in the double-gated graphite film. The
screening length of 1.2 nm was experimentally obtained.


title:
A new sharp estimate on the dimension of the attractor for the Dirichlet
  problem of the complex Ginzburg-Landau equation

abstract:
  Using the improved lower bound on the sum of the eigenvalues of the Dirichlet
Laplacian proved by A. D. Melas (Proc. Amer. Math. Soc. \textbf{131} (2003)
631-636), we report a new and sharp estimate for the dimension of the global
attractor associated to the complex Ginzburg-Landau equation supplemented with
Dirichlet boundary conditions.


title:
Novel exponents control the quasi-deterministic limit of the extinction
  transition

abstract:
  The quasi-deterministic limit of the generic extinction transition is
considered within the framework of standard epidemiological models. The
susceptible-infected-susceptible (SIS) model is known to exhibit a transition
from extinction to spreading, as the infectivity is increased, described by the
directed percolation equivalence class. We find that the distance from the
transition point, and the prefactor controlling the divergence of the
(perpendicular) correlation length, both scale with the local population size,
$N$, with two novel universal exponents. Different exponents characterize the
large $N$ behavior of the susceptible-infected-recovered (SIR) model, which
belongs to the dynamic percolation class. Extensive numerical studies in a
range of systems lead to the conjecture that these characteristics are generic
and may be used in order to classify the high density limit of any stochastic
process on the edge of extinction.


title: Multi-ferroelectricity in charge ordered LuFe2O4(LuFeO3)n with n=1

abstract:
  Electronic ferroelectricity from charge ordering (CO) is currently a
significant issue that has been extensively investigated in the charge/spin
frustrated LuFe2O4 system. Chemical substitution and structural layer
intercalation have been considered as potentially effective approaches in our
recent study, and we herein report on the structural and multi-ferromagnetic
properties in the layered series of LuFe2O4(LuFeO3)n (n=0, 1, and 2).
Experimental investigations reveal that the (RFeO3)-layer intercalation results
in notable changes in ferroelectricity, magnetic properties and CO features.
These results demonstrate that further exploration of this series of layered
members might prove fruitful.


title:
Reaction-diffusion processes in zero transverse dimensions as toy models
  for high-energy QCD

abstract:
  We examine numerically different zero-dimensional reaction-diffusion
processes as candidate toy models for high-energy QCD evolution. Of the models
examined -- Reggeon Field Theory, Directed Percolation and Reversible Processes
-- only the latter shows the behaviour commonly expected, namely an increase of
the scattering amplitude with increasing rapidity. Further, we find that
increasing recombination terms, quantum loops and the heuristic inclusion of a
running of the couplings, generically slow down the evolution.


title:
Finite doping of a one-dimensional charge density wave: solitons vs.
  Luttinger liquid charge density

abstract:
  The effects of doping on a one-dimensional wire in a charge density wave
state are studied using the density-matrix renormalization group method. We
show that for a finite number of extra electrons the ground state becomes
conducting but the particle density along the wire corresponds to a charge
density wave with an incommensurate wave number determined by the filling. We
find that the absence of the translational invariance can be discerned even in
the thermodynamic limit, as long as the number of doping electrons is finite.
Luttinger liquid behavior is reached only for a finite change in the electron
filling factor, which for an infinite wire corresponds to the addition of an
infinite number of electrons. In addition to the half filled insulating Mott
state and the conducting states, we find evidence for subgap states at fillings
different from half filling by a single electron or hole. Finally, we show that
by coupling our system to a quantum dot, one can have a discontinuous
dependence of its population on the applied gate voltage in the thermodynamic
limit, similarly to the one predicted for a Luttinger liquid without umklapp
processes.


title: Website Optimization through Mining User Navigational Pattern

abstract:
  With the World Wide Web's ubiquity increase and the rapid development of
various online businesses, the complexity of web sites grow. The analysis of
web user's navigational pattern within a web site can provide useful
information for server performance enhancements, restructuring a website and
direct marketing in e-commerce etc. In this paper, an algorithm is proposed for
mining such navigation patterns. The key insight is that users access
information of interest and follow a certain path while navigating a web site.
If they don't find it, they would backtrack and choose among the alternate
paths till they reach the destination. The point they backtrack is the
Intermediate Reference Location. Identifying such Intermediate locations and
destinations out of the pattern will be the main endeavor in the rest of this
report.


title: Molecular Dynamics Study of Polarization Effects on AgI

abstract:
  Three different models of AgI are studied by molecular dynamics simulations.
The first one is the rigid ion model (RIM) with the effective pair potential of
the Vashishta and Rahman form and the parameterization proposed by Shimojo and
Kobayashi. The other two are polarizable ion models in which the induced
polarization effects have been added to the RIM effective pair potential. In
one of them (PIM1) only the anions are assumed to be polarizable by the local
electric field. In the other one (PIM2s) the silver polarization is also
included, and a short-range overlap induced polarization opposes the
electrically induced dipole moments. This short-range polarization is proved to
be necessary to avoid overpolarization when both species are assumed to be
polarizable. The three models reproduce the superionic character of alpha-AgI
at 573 K and the liquid behavior of molten AgI at 923 K. The averaged spatial
distribution of the cations in the alpha-phase obtained for PIM1 appears to be
in better agreement with experimental data analysis. The PIM1 also reproduces
the structure factor prepeak at about 1 reciprocal angstrom observed from
neutron diffraction data of molten AgI. The three models retain in the liquid
phase the superionic character of alpha-AgI as the mobility of the cations is
significantly larger than that for the anions. The ionic conductivity for the
polarizable ion models is in better agreement with experimental data for
alpha-AgI and molten AgI.


title: Geometric quantization of weak-Hamiltonian functions

abstract:
  The paper presents an extension of the geometric quantization procedure to
integrable, big-isotropic structures. We obtain a generalization of the
cohomology integrality condition, we discuss geometric structures on the total
space of the corresponding principal circle bundle and we extend the notion of
a polarization.


title:
On a Source of Systematic Error in Absolute Measurement of
  Galactocentric Distance from Solving for the Stellar Orbit Around Sgr A*

abstract:
  Eisenhauer et al. (2003, 2005) derived absolute (geometrical) estimates of
the distanceto the center of the Galaxy, $R_0$, from the star S2 orbit around
Sgr A* on the assumption that the intrinsic velocity of Sgr A* is negligible.
This assumption produces the source of systematic error in $R_0$ value owing to
a probable motion of Sgr A* relative to the accepted velocity reference system
which is arbitrary to some extent. Eisenhauer et al. justify neglecting all
three spatial velocity components of Sgr A* mainly by low limits of Sgr A*'s
proper motion of 20--60 km/s. In this brief paper, a simple analysis in the
context of the Keplerian dynamics was used to demonstrate that neglect of even
low (perhaps, formal) radial velocity of Sgr A* leads to a substantial
systematic error in $R_0$: the same limits of 20--60 km/s result in $R_0$
errors of 1.3--5.6%, i.e., (0.1--0.45)$\times (R_0/8)$ kpc, for current S2
velocities. Similar values for Sgr A*'s tangential motion can multiply this
systematic error in the case of S2 orbit by factor ${\approx}1.5$--1.9 in the
limiting cases.


title:
Hierarchy Construction of Quantum Hall States and Non-Commutative
  Chern-Simons Theory

abstract:
  In this paper, we study the non-commutative Chern-Simons description of the
hierarchy of quantum Hall states. Our method is based on the framework
suggested by Susskind in hep-th/0101029. By using the area preserving
diffeomorphism gauge symmetry of quasiparticle fluid, we show that
non-commutative Chern-Simons description of the hierarchy construction of
quantum Hall states with generic filling fraction can be realized in Susskind's
approach. The relationship between our model and the pervious work on the
effective field theory of quantum Hall states is also discussed.


title: On Black Hole Effective Potential in 6D/7D N=2 Supergravity

abstract:
  Using the harmonic superspace method and the duality between real and complex
representations of hypermultiplets, we compute the explicit scalar field
expression of the quaternionic metric $G_{mn}$ of the moduli space
SO(1,1)x[SO(4,k)/(SO(4)xSO(k))] of 6D N=2 supergravity with generic k Maxwell
supermultiplets. The obtained metric includes the particular case k=20
associated with 10D type IIA superstring on K3. Uplifting to 7D N=2
supergravity is described and aspects of 6D/7D black attractor effective
potentials are studied.


title:
The FERRUM Project: experimental and theoretical transition rates of
  forbidden [Sc II] lines and radiative lifetimes of metastable Sc II levels

abstract:
  Context. In many plasmas, long-lived metastable atomic levels are depopulated
by collisions (quenched) before they decay radiatively. In low-density regions,
however, the low collision rate may allow depopulation by electric dipole (E1)
forbidden radiative transitions, so-called forbidden lines (mainly M1 and E2
transitions). If the atomic transition data are known, these lines are
indicators of physical plasma conditions and used for abundance determination.
Aims. Transition rates can be derived by combining relative intensities between
the decay channels, so-called branching fractions (BFs), and the radiative
lifetime of the common upper level. We use this approach for forbidden [Sc ii]
lines, along with new calculations. Methods. Neither BFs for forbidden lines,
nor lifetimes of metastable levels, are easily measured in a laboratory.
Therefore, astrophysical BFs measured in Space Telescope Imaging Spectrograph
(STIS) spectra of the strontium filament of Eta Carinae are combined with
lifetime measurements using a laser probing technique on a stored ion-beam
(CRYRING facility,MSL, Stockholm). These quantities are used to derive the
absolute transition rates (A-values). New theoretical transition rates and
lifetimes are calulated using the CIV3 code. Results. We report experimental
lifetimes of the Sc ii levels 3d2 a3P0,1,2 with lifetimes 1.28, 1.42, and 1.24
s, respectively, and transition rates for lines from these levels down to 3d4s
a3D in the region 8270-8390 A. These are the most important forbidden [Sc ii]
transitions. New calculations for lines and metastable lifetimes are also
presented, and are in good agreement with the experimental data.


title: Time--space harmonic polynomials relative to a L\'{e}vy process

abstract:
  In this work, we give a closed form and a recurrence relation for a family of
time--space harmonic polynomials relative to a L\'{e}vy process. We also state
the relationship with the Kailath--Segall (orthogonal) polynomials associated
to the process.


title:
Impact of Exchange-Correlation Effects on the IV Characteristics of a
  Molecular Junction

abstract:
  The role of exchange-correlation effects in non-equilibrium quantum transport
through molecular junctions is assessed by analyzing the IV curve of a generic
two-level model using self-consistent many-body perturbation theory (second
Born and GW approximations) on the Keldysh contour. For weak molecule-lead
coupling we identify a mechanism which can lead to anomalously strong peaks in
the dI/dV due to a bias-induced interplay between the position of the HOMO and
LUMO levels. The effect is suppressed by self-interaction errors and is
therefore unlikely to be observed in standard transport calculations based on
density functional theory. Inclusion of dynamic correlations lead to
substantial renormalization of the energy levels. In particular, we find a
strong enhancement of quasi-particle (QP) scattering at finite bias which
reduces the QP lifetimes significantly with a large impact on the IV curve.


title:
On the ternary Goldbach problem with primes in independent arithmetic
  progressions

abstract:
  We show that for every fixed $A>0$ and $\theta>0$ there is a
  $\vartheta=\vartheta(A,\theta)>0$ with the following property.
  Let $n$ be odd and sufficiently large, and let
  $Q_{1}=Q_{2}:=n^{\h}(\log n)^{-\vartheta}$ and $Q_{3}:=(\log n)^{\theta}$.
Then for all $q_{3}\leq Q_{3}$, all reduced residues $a_{3}$ mod $q_{3}$,
almost all $q_{2}\leq Q_{2}$, all admissible residues $a_{2}$ mod $q_{2}$,
almost all $q_{1}\leq Q_{1}$ and all admissible residues $a_{1}$ mod $q_{1}$,
there exists a representation $n=p_{1}+p_{2}+p_{3}$ with primes $p_{i}\equiv
a_{i} (q_{i})$, $i=1,2,3$.


title: Hypersound damping in vitreous silica measured by picosecond acoustics

abstract:
  The attenuation of longitudinal acoustic phonons up to frequencies nearing
250 GHz is measured in vitreous silica with a picosecond optical technique.
Taking advantage of interferences on the probe beam, difficulties encountered
in early pioneering experiments are alleviated. Sound damping at 250 GHz and
room temperature is consistent with relaxation dominated by anharmonic
interactions with the thermal bath, extending optical Brillouin scattering
data. Our result is at variance with claims of a recent deep-UV experiment
which reported a rapid damping increase beyond 100 GHz. A comprehensive picture
of the frequency dependence of sound attenuation in $v$-SiO$_2$ can be
proposed.


title: Electroweak symmetry breaking from unparticles

abstract:
  A new type of scalar potential inspired by unparticles is proposed for the
electroweak symmetry breaking. The interaction between the standard model
fields and unparticle sector is described by the non-integral power of fields
that originates from the nontrivial scaling dimension of the unparticle
operator. We find that unlike the usual integral-power potential, the
electroweak symmetry is broken at tree level. The scale invariance of
unparticle sector is also broken simultaneously, resulting in a physical Higgs
and a lighter scalar particle.


title:
The Cosmic Microwave Background for Pedestrians: A Review for Particle
  and Nuclear Physicists

abstract:
  We intend to show how fundamental science is drawn from the patterns in the
temperature and polarization fields of the cosmic microwave background (CMB)
radiation, and thus to motivate the field of CMB research. We discuss the
field's history, potential science and current status, contaminating
foregrounds, detection and analysis techniques and future prospects. Throughout
the review we draw comparisons to particle physics, a field that has many of
the same goals and that has gone through many of the same stages.


title:
Goodness-of-fit tests for Markovian time series models: Central limit
  theory and bootstrap approximations

abstract:
  New goodness-of-fit tests for Markovian models in time series analysis are
developed which are based on the difference between a fully nonparametric
estimate of the one-step transition distribution function of the observed
process and that of the model class postulated under the null hypothesis. The
model specification under the null allows for Markovian models, the transition
mechanisms of which depend on an unknown vector of parameters and an
unspecified distribution of i.i.d. innovations. Asymptotic properties of the
test statistic are derived and the critical values of the test are found using
appropriate bootstrap schemes. General properties of the bootstrap for
Markovian processes are derived. A new central limit theorem for triangular
arrays of weakly dependent random variables is obtained. For the proof of
stochastic equicontinuity of multidimensional empirical processes, we use a
simple approach based on an anisotropic tiling of the space. The finite-sample
behavior of the proposed test is illustrated by some numerical examples and a
real-data application is given.


title:
Meta-Stable Brane Configurations, Multiple NS5-Branes, and Rotated
  D6-Branes

abstract:
  We construct the type IIA nonsupersymmetric meta-stable brane configurations
corresponding to the various N=1 supersymmetric gauge theories. The D6-branes
are both displaced and rotated where these deformations are described as the
mass term and quartic term for the fundamental flavors respectively. The
multiplicity of the NS5-branes occurs in the superpotential order for adjoint,
symmetric, or bifundamental matters. A rich pattern of nonsupersymmetric
meta-stable states as well as the supersymmetric stable states is found.


title:
The first magnetic maps of a pre-main sequence binary star system - HD
  155555

abstract:
  We present the first maps of the surface magnetic fields of a pre-main
sequence binary system. Spectropolarimetric observations of the young, 18 Myr,
HD 155555 (V824 Ara, G5IV + K0IV) system were obtained at the Anglo-Australian
Telescope in 2004 and 2007. Both datasets are analysed using a new binary
Zeeman Doppler imaging (ZDI) code. This allows us to simultaneously model the
contribution of each component to the observed circularly polarised spectra.
Stellar brightness maps are also produced for HD 155555 and compared to
previous Doppler images. Our radial magnetic maps reveal a complex surface
magnetic topology with mixed polarities at all latitudes. We find rings of
azimuthal field on both stars, most of which are found to be non-axisymmetric
with the stellar rotational axis. We also examine the field strength and the
relative fraction of magnetic energy stored in the radial and azimuthal field
components at both epochs. A marked weakening of the field strength of the
secondary star is observed between the 2004 and 2007 epochs. This is
accompanied by an apparent shift in the location of magnetic energy from the
azimuthal to radial field. We suggest that this could be indicative of a
magnetic activity cycle. We use the radial magnetic maps to extrapolate the
coronal field (by assuming a potential field) for each star individually - at
present ignoring any possible interaction. The secondary star is found to
exhibit an extreme tilt (~75 deg) of its large scale magnetic field to that of
its rotation axis for both epochs. The field complexity that is apparent in the
surface maps persists out to a significant fraction of the binary separation.
Any interaction between the fields of the two stars is therefore likely to be
complex also. Modelling this would require a full binary field extrapolation.


title:
Properties of superconductivity on the density wave background with
  small ungapped Fermi surface pockets

abstract:
  We investigate the properties and the microscopic structure of
superconductivity (SC), coexisting and sharing the common conducting band with
density wave (DW). Such coexistence may take place when the nesting of the
Fermi surface (FS) is not perfect, and in the DW state some quasi-particle
states remain on the Fermi level and lead to the Cooper instability. The
dispersion of such quasi-particle states is, in general, very different from
that without DW. Therefore, the properties of SC on the DW background may
strongly differ from those without DW. The upper critical field $H_{c2}$ in
such a SC state increases as the system approaches the critical pressure, where
the ungapped quasi-particles and superconductivity just appear, and it may
considerably exceed the usual $H_{c2}$ value without DW. The SDW background
strongly suppresses the singlet SC pairing, while it does not affect so much
the triplet SC transition temperature. The results obtained explain the
experimental observations in layered organic metals (TMTSF)$_{2}$PF$_{6}$ and
$\alpha $-(BEDT-TTF)$_{2}$KHg(SCN)$_{4}$, where SC appears in the DW states
under pressure and shows many unusual properties.


title: Smectic-$A$ elastomers with weak director anchoring

abstract:
  Experimentally it is possible to manipulate the director in a (chiral)
smectic-$A$ elastomer using an electric field. This suggests that the director
is not necessarily locked to the layer normal, as described in earlier papers
that extended rubber elasticity theory to smectics. Here, we consider the case
that the director is weakly anchored to the layer normal assuming that there is
a free energy penalty associated with relative tilt between the two. We use a
recently developed weak-anchoring generalization of rubber elastic approaches
to smectic elastomers and study shearing in the plane of the layers, stretching
in the plane of the layers, and compression and elongation parallel to the
layer normal. We calculate, inter alia, the engineering stress and the tilt
angle between director and layer normal as functions of the applied
deformation. For the latter three deformations, our results predict the
existence of an instability towards the development of shear accompanied by
smectic-$C$-like order.


title:
Moufang symmetry X. Generalized Lie and Maurer-Cartan equations of
  continuous Moufang transformations

abstract:
  The differential equations for a continuous birepresentation of a local
analytic Moufang loop are established. The commutation relations for the
infinitesimal operators of the representation are found. These commutation
relations can be seen as a (minimal) generalization of the Maurer-Cartan
equations and do not depend on the particular birepresentation.