title: High-resolution radio observations of X-ray binaries

abstract:
  I present an overview of important results obtained using high-resolution
very long baseline interferometry (VLBI) observations of X-ray binary systems.
These results derive from both astrometric observations and resolved imaging of
sources, from black holes to neutron star and even white dwarf systems. I
outline a number of upcoming developments in instrumentation, both new
facilities and ongoing upgrades to existing VLBI instruments, and I conclude by
identifying a number of important areas of investigation where VLBI will be
crucial in advancing our understanding of X-ray binaries.


title:
Stability of noncharacteristic boundary layers in the standing shock
  limit

abstract:
  We investigate one- and multi-dimensional stability of noncharacteristic
boundary layers in the limit approaching a standing planar shock wave $\bar
U(x_1)$, $x_1>0$, obtaining necessary conditions of (i) weak stability of the
limiting shock, (ii) weak stability of the constant layer $u\equiv
U_-:=\lim_{z\to -\infty} \bar U(z)$, and (iii) nonnegativity of a modified
Lopatinski determinant similar to that of the inviscid shock case. For Lax
1-shocks, we obtain equally simple sufficient conditions; for $p$-shocks,
$p>1$, the situation appears to be more complicated. Using these results, we
determine stability of certain isentropic and full gas dynamical
boundary-layers, generalizing earlier work of Serre--Zumbrun and
Costanzino--Humphreys--Nguyen--Zumbrun.


title: Contagious obesity: from adenovirus 36 to RB dysfunction

abstract:
  Significant overweight represents a major health problem in industrialized
countries. Besides its known metabolic origins, this condition may also have an
infectious cause, as recently postulated. Here, it is surmised that the
potentially causative adenovirus 36 contributes to such disorder by
inactivating the retinoblastoma tumor suppressor protein (RB) in a manner
reminiscent of a mechanism employed by both another pathogenic adenoviral agent
and insulin. The present insight additionally suggests novel modes of
interfering with obesity-associated pathology.


title:
Role of covalent Fe-As bonding in the magnetic moment formation and
  exchange mechanisms in iron-pnictide superconductors

abstract:
  The electronic origin of the huge magnetostructural effect in layered Fe-As
compounds is elucidated using LiFeAs as a prototype. The crucial feature of
these materials is the strong covalent bonding between Fe and As, which tends
to suppress the exchange splitting. The bonding-antibonding splitting is very
sensitive to the distance between Fe and As nuclei. We argue that the fragile
interplay between bonding and magnetism is universal for this family of
compounds. The exchange interaction is analyzed in real space, along with its
correlation with covalency and doping. The range of interaction and itinerancy
increase as the Fe-As distance is decreased. Superexchange makes a large
antiferromagnetic contribution to the nearest-neighbor coupling, which develops
large anisotropy when the local moment is not too small. This anisotropy is
very sensitive to doping.


title:
Observation of $\eta'$ decays to $\pi^+\pi^-\pi^0$ and
  $\pi^+\pi^-\e^+e^-$

abstract:
  Using psi(2S) --> pi+ pi- J/psi, J/psi --> gamma eta' events acquired with
the CLEO-c detector at the CESR e+e- collider, we make the first observations
of the decays eta' --> pi+ pi- pi0 and eta' --> pi+ pi- e+ e-, measuring
absolute branching fractions (37 +11 -9 +- 4) x 10^-4 and (25 +12 -9 +- 5) x
10^-4, respectively. For eta' --> pi+ pi- pi0, this result probes the mechanism
of isospin violation and the roles of pi0/eta/eta'-mixing and final state
rescattering in strong decays. We also set upper limits on branching fractions
for eta' decays to pi+ pi- mu+ mu-, 2(pi+ pi-), pi+ pi- 2pi0, 2(pi+ pi-)pi0,
3(pi+ pi-), and invisible final states.


title: Experimental high-intensity three-photon entangled source

abstract:
  We experimentally realize a high-intensity three-photon
Greenberger-Horne-Zeilinger (GHZ) entanglement source directly following the
proposal by Rarity and Tapster [J. G. Rarity and P. R. Tapster, Phys. Rev. A
59, R35 (1999)]. The threefold coincidence rate can be more than 200 Hz with a
fidelity of 0.811, and the intensity can be further improved with moderate
fidelity degradation. The GHZ entanglement is characterized by testing the
Bell-Mermin inequality and using an entanglement witness operator. To optimize
the polarization-entangled source, we theoretically analyze the relationship
between the mean photon number of the single-photon source and the probability
of parametric down-conversion.


title: Casimir effect at finite temperature in a real scalar field theory

abstract:
  We use a functional approach to evaluate the Casimir free energy for a
self-interacting scalar field in $d+1$ dimensions, satisfying Dirichlet
boundary conditions on two parallel planes. When the interaction is turned off,
exact results for the free energy in some particular cases may be found, as
well as low and high temperature expansions based on a duality relation that
involves the inverse temperature $\beta$ and the distance between the mirrors,
$a$. For the interacting theory, we derive and implement two different
approaches. The first one is a perturbative expansion built with a thermal
propagator that satisfies Dirichlet boundary conditions on the mirrors. The
second approach uses the exact finite-temperature generating functional as a
starting point. In this sense, it allows one to include, for example,
non-perturbative thermal corrections into the Casimir calculation, in a
controlled way. We present results for calculations performed using those two
approaches.


title: Physical time and other conceptual issues of QG on the example of LQC

abstract:
  Several conceptual aspects of quantum gravity are studied on the example of
the homogeneous isotropic LQC model. In particular: $(i)$ The proper time of
the co-moving observers is showed to be a quantum operator {and} a quantum
spacetime metric tensor operator is derived. $(ii)$ Solutions of the quantum
scalar constraint for two different choices of the lapse function are compared
and contrasted. In particular it is shown that in case of model with masless
scalar field and cosmological constant $\Lambda$ the physical Hilbert spaces
constructed for two choices of lapse are the same for $\Lambda<0$ while they
are significantly different for $\Lambda>0$. $(iii)$ The mechanism of the
singularity avoidance is analyzed via detailed studies of an energy density
operator, whose essential spectrum was shown to be an interval $[0,\rhoc]$,
where $\rhoc\approx 0.41\rho_{\Pl}$. $(iv)$ The relation between the
kinematical and the physical quantum geometry is discussed on the level of
relation between observables.


title:
Do the photometric colors of Type II-P Supernovae allow accurate
  determination of host galaxy extinction?

abstract:
  We present infrared photometry of SN 1999em, plus optical photometry,
infrared photometry, and optical spectroscopy of SN 2003hn. Both objects were
Type II-P supernovae. The V-[RIJHK] color curves of these supernovae evolved in
a very similar fashion until the end of plateau phase. This allows us to
determine how much more extinction the light of SN 2003hn suffered compared to
SN 1999em. Since we have an estimate of the total extinction suffered by SN
1999em from model fits of ground-based and space-based spectra as well as
photometry of SN 1999em, we can estimate the total extinction and absolute
magnitudes of SN 2003hn with reasonable accuracy. Since the host galaxy of SN
2003hn also produced the Type Ia SN 2001el, we can directly compare the
absolute magnitudes of these two SNe of different types.


title:
On the frequency, intensity and duration of starburst episodes triggered
  by galaxy interactions and mergers

abstract:
  We investigate the intensity enhancement and the duration of starburst
episodes, triggered by major galaxy interactions and mergers. To this aim, we
analyze two large statistical datasets of numerical simulations. These have
been obtained using two independent and different numerical techniques to model
baryonic and dark matter evolution, that are extensively compared for the first
time. One is a Tree-SPH code, the other one is a grid-based N-body
sticky-particles code. We show that, at low redshift, galaxy interactions and
mergers in general trigger only moderate star formation enhancements. Strong
starbursts where the star formation rate is increased by a factor larger than 5
are rare and found only in about 15% of major galaxy interactions and mergers.
Merger-driven starbursts are also rather short-lived, with a typical duration
of the activity of a few 10^8 yr. These conclusions are found to be robust,
independent from the numerical techniques and star formation models. At higher
redshifts where galaxies contain more gas, gas inflow-induced starbursts are
neither stronger neither longer than their local counterparts. In turn, the
formation of massive gas clumps, results of local Jeans instability that can
occur spontaneously in gas-rich disks or be indirectly favored by galaxy
interactions, could play a more important role in determining the duration and
intensity of star formation episodes.


title: On cluster algebras arising from unpunctured surfaces II

abstract:
  We study cluster algebras with principal and arbitrary coefficient systems
that are associated to unpunctured surfaces. We give a direct formula for the
Laurent polynomial expansion of cluster variables in these cluster algebras in
terms of certain paths on a triangulation of the surface. As an immediate
consequence, we prove the positivity conjecture of Fomin and Zelevinsky for
these cluster algebras.
  Furthermore, we obtain direct formulas for F-polynomials and g-vectors and
show that F-polynomials have constant term equal to 1. As an application, we
compute the Euler-Poincar\'e characteristic of quiver Grassmannians in Dynkin
type $A$ and affine Dynkin type $\tilde A$.


title:
Proximal Point Method for a Special Class of Nonconvex Functions on
  Hadamard Manifolds

abstract:
  In this paper we present the proximal point method for a special class of
nonconvex function on a Hadamard manifold. The well definedness of the sequence
generated by the proximal point method is guaranteed. Moreover, it is proved
that each accumulation point of this sequence satisfies the necessary
optimality conditions and, under additional assumptions, its convergence for a
minimizer is obtained.


title: NoSOCS in SDSS. I. Sample Definition and Comparison of Mass Estimates

abstract:
  We use Sloan Digital Sky Survey (SDSS) data to investigate galaxy cluster
properties of systems first detected within DPOSS. With the high quality
photometry of SDSS we derived new photometric redshifts and estimated richness
and optical luminosity. For a subset of low redshift ($z \le 0.1$) clusters, we
have used SDSS spectroscopic data to identify groups in redshift space in the
region of each cluster, complemented with massive systems from the literature
to assure the continuous mass sampling. A method to remove interlopers is
applied, and a virial analysis is performed resulting in estimates of velocity
dispersion, mass, and a physical radius for each low-$z$ system. We discuss the
choice of maximum radius and luminosity range in the dynamical analysis,
showing that a spectroscopic survey must be complete to at least M$^*+1$ if one
wishes to obtain accurate and unbiased estimates of velocity dispersion and
mass. We have measured X-ray luminosity for all clusters using archival data
from RASS. For a smaller subset (twenty-one clusters) we selected temperature
measures from the literature and estimated mass from the M-T$_X$ relation,
finding that they show good agreement with the virial estimate. However, these
two mass estimates tend to disagree with the caustic results. We measured the
presence of substructure in all clusters of the sample and found that clusters
with substructure have virial masses higher than those derived from T$_X$. This
trend is not seen when comparing the caustic and X-ray masses. That happens
because the caustic mass is estimated directly from the mass profile, so it is
less affected by substructure.


title: Hydrodynamics from charged black branes

abstract:
  We extend the recent work on fluid-gravity correspondence to charged
black-branes by determining the metric duals to arbitrary charged fluid
configuration up to second order in the boundary derivative expansion. We also
derive the energy-momentum tensor and the charge current for these
configurations up to second order in the boundary derivative expansion. We find
a new term in the charge current when there is a bulk Chern-Simons interaction
thus resolving an earlier discrepancy between thermodynamics of charged
rotating black holes and boundary hydrodynamics. We have also confirmed that
all our expressions are covariant under boundary Weyl-transformations as
expected.


title: Can the Copernican principle be tested by cosmic neutrino background?

abstract:
  The Copernican principle, stating that we do not occupy any special place in
our universe, is usually taken for granted in modern cosmology. However recent
observational data of supernova indicate that we may live in the under-dense
center of our universe, which makes the Copernican principle challenged. It
thus becomes urgent and important to test the Copernican principle via
cosmological observations. Taking into account that unlike the cosmic photons,
the cosmic neutrinos of different energies come from the different places to us
along the different worldlines, we here propose cosmic neutrino background as a
test of the Copernican principle. It is shown that from the theoretical
perspective cosmic neutrino background can allow one to determine whether the
Copernican principle is valid or not, but to implement such an observation the
larger neutrino detectors are called for.


title: Sharpening the Tip of the Red Giant Branch

abstract:
  We introduce a modified detection method for measuring the luminosity of the
tip of the red giant branch (TRGB) by introducing the composite magnitude T = I
- beta [(V-I)_o - 1.50], where beta is the slope of the tip magnitude as a
function of color (or metallicity). The method is specifically designed to
account for known systematics due to metallicity. In doing so, this simple
transformation does away with arbitrary color selections in measuring the tip,
and thereby significantly boosts the population of resolved stars that go into
defining the TRGB distance. Moreover this method coincidentally reduces the
impact of reddening on the true modulus as well as its final uncertainty.


title:
First detection of hard X-ray photons in the soft X-ray transient
  Narrow-Line Seyfert 1 galaxy WPVS 007: The X-ray photon distribution observed
  by Swift

abstract:
  We report on the first detection of hard X-ray photons (E>2.5 keV) in the
X-ray transient Narrow-Line Seyfert 1 galaxy WPVS 007 which was the AGN with
the softest X-ray spectrum during the ROSAT All-Sky Survey. The AGN is clearly
detected at a level of about 2 x 10^{-17} W m^{-2} in the observed 0.3-10.0 keV
band by Swift in a 50 ks observation in 2007 September. For the first time
since the ROSAT All-Sky Survey observation in 1990 it was possible to derive an
X-ray photon distribution by adding together all Swift observations that have
been performed so far (85.5 ks in total). This photon distribution is
consistent with an X-ray spectrum of an AGN with a partial covering absorber
with a column density in the order of ~ 1 x 10^{23} cm^{-2} and a covering
fraction of about 90%. A comparison with the 2002 Chandra data suggests that
WPVS 007 has become brighter by a factor of about 4. The Swift data also
suggest that the absorber which is causing the current low-state may have
started to disappear. This disappearance is indicated by a significant change
in the hardness ratio from a very soft X-ray state during the 2005 October to
2007 January observations to a rather hard X-ray state in the 2007 September
observations. In the UV, WPVS 007 seems to become fainter by up to 0.5 mag over
the last two years. The optical to X-ray spectral slope derived from the
spectral energy distribution is alpha-ox=2.5 which classifies WPVS 007 as an
X-ray weak AGN. After correcting for reddening and X-ray absorption, alpha-ox
becomes 1.9 and the luminosity in the Big-Blue-Bump is log LBBB=37.7 [W], which
translates into an Eddington ratio
  L/LEdd ~ 1.0.


title:
SDSSJ084539.17+225728.0: the first DBZ white dwarf with a metal-rich
  gaseous debris disc

abstract:
  We report the discovery of a third white dwarf hosting a gaseous debris disc,
SDSSJ084539.17+225728.0. The typical double-peaked CaII 8498,8542,8662A
emission lines can be modelled in terms of a Keplerian gas disc with a radial
extent from ~0.5Rsun to ~1.0. The effective temperature of SDSS0845+2257,
Teff=18600+-500K, is comparable to the two other white dwarfs with gaseous
discs, SDSS1043+0855 and SDSS1228+1040, and hence substantially hotter than the
bulk of white dwarfs where dusty debris discs were identified through the
presence of infrared excess flux. This may suggest that the conditions to
produce emission lines from debris discs in the optical wavelength range are
only met for a relatively narrow range in Teff. The observed asymmetry in the
line profiles indicates a substantial eccentricity in the disc. Two spectra
obtained four years apart reveal a significant change in the shapes and
equivalent widths of the line profiles, implying that the circumstellar disc
evolves on relatively short time scales. In contrast to SDSS1043+0855 and
SDSS1228+1040, SDSS0845+2257 has a helium-dominated atmosphere. We detect
photospheric absorption lines of He, Ca, Mg, and Si in the Sloan Digital Sky
Survey spectrum, and hence classify SDSS0845+2257 as DBZ white dwarf. The
abundances for the three metals determined from model atmosphere fits are
Ca/He~1.3x10^-7, Mg/He~6.0x10^-6, and Si/He~8.0x10^-6. From the non-detection
of Halpha we derive H/He<3x10^-5, which implies that the hydrogen-to-metal
abundance ratio of the circumstellar material is >~1000 times lower than in the
Sun. This lends strong support to the hypothesis that the gaseous and dusty
debris discs found around roughly a dozen white dwarfs originate from the
disruption of rocky planetary material.


title:
Two dark matter components in N_{DM}MSSM and dark matter extension of
  the minimal supersymmetric standard model and the high energy positron
  spectrum in PAMELA/HEAT data

abstract:
  We present the dark matter (DM) extension (by N) of the minimal
supersymmetric standard model to give the recent trend of the high energy
positron spectrum of the PAMELA/HEAT experiments. If the trend survives by
future experiments, the MSSM needs to be extended. Here, we minimally extend
the MSSM with one more DM component N together with a heavy lepton E, and
introduce the coupling e_R E_R^c N_R. This coupling naturally appears in the
flipped SU(5) GUT models. This N_{DM}MSSM contains the discrete symmetry Z_6,
and for some parameter ranges there result two DM components. For the MSSM
fields, the conventional R-parity, which is a subgroup of Z_6, is preserved. We
also present the needed parameter ranges of these additional particles.


title:
A Search for the Most Massive Galaxies. II. Structure, Environment and
  Formation

abstract:
  We study a sample of 43 early-type galaxies, selected from the SDSS because
they appeared to have velocity dispersion > 350 km/s. High-resolution
photometry in the SDSS i passband using HRC-ACS on board the HST shows that
just less than half of the sample is made up of superpositions of two or three
galaxies, so the reported velocity dispersion is incorrect. The other half of
the sample is made up of single objects with genuinely large velocity
dispersions. None of these objects has sigma larger than 426 +- 30 km/s. These
objects define rather different relations than the bulk of the early-type
galaxy population: for their luminosities, they are the smallest, most massive
and densest galaxies in the Universe. Although the slopes of the scaling
relations they define are rather different from those of the bulk of the
population, they lie approximately parallel to those of the bulk "at fixed
sigma". These objects appear to be of two distinct types: the less luminous
(M_r>-23) objects are rather flattened and extremely dense for their
luminosities -- their properties suggest some amount of rotational support and
merger histories with abnormally large amounts of gaseous dissipation. The more
luminous objects (M_r<-23) tend to be round and to lie in or at the centers of
clusters. Their properties are consistent with the hypothesis that they are
BCGs. Models in which BCGs form from predominantly radial mergers having little
angular momentum predict that they should be prolate. If viewed along the major
axis, such objects would appear to have abnormally large sigma for their sizes,
and to be abnormally round for their luminosities. This is true of the objects
in our sample once we account for the fact that the most luminous galaxies
(M_r<-23.5), and BCGs, become slightly less round with increasing luminosity.


title: Horizontal Branch Morphology and Mass Loss in Globular Clusters

abstract:
  The connection between mass loss on the red giant branch (RGB) and horizontal
branch (HB) morphology in globular clusters (GCs) has long been acknowledged
but the mechanisms governing mass loss remains poorly understood from a
theoretical perspective. The present study uses synthetic HB models to
demonstrate for the first time that alpha-enhancement and a simple relation
between mass loss and metallicity can explain the entire range of HB morphology
(characterized by the HB type index) observed in old, coeval GCs. The mass
loss-metallicity relation accounts naturally for the fact that the most metal
poor GCs ([Fe/H] < -2) have redder HBs than is typical of GCs with -2 < [Fe/H]
< -1.5 without invoking younger ages. These results may prove useful in
studying the contribution of HB stars to integrated light via stellar
population synthesis.


title: An obstacle to populating the string theory landscape

abstract:
  We construct domain walls and instantons in a class of models with coupled
scalar fields, determining, in agreement with previous studies, that many such
solutions contain naked timelike singularities. Vacuum bubble solutions of this
type do not contain a region of true vacuum, obstructing the ability of eternal
inflation to populate other vacua. We determine a criterion that potentials
must satisfy to avoid the existence of such singularities, and show that many
domain wall solutions in Type IIB string theory are singular. This has profound
implications for applying the program of eternal inflation to making
predictions in the string theory landscape.


title: Quiver Varieties and Branching

abstract:
  Braverman and Finkelberg recently proposed the geometric Satake
correspondence for the affine Kac-Moody group $G_\aff$ [Braverman A.,
Finkelberg M., arXiv:0711.2083]. They conjecture that intersection cohomology
sheaves on the Uhlenbeck compactification of the framed moduli space of
$G_{\mathrm{cpt}}$-instantons on $\R^4/\Z_r$ correspond to weight spaces of
representations of the Langlands dual group $G_\aff^\vee$ at level $r$. When $G
= \SL(l)$, the Uhlenbeck compactification is the quiver variety of type
$\algsl(r)_\aff$, and their conjecture follows from the author's earlier result
and I. Frenkel's level-rank duality. They further introduce a convolution
diagram which conjecturally gives the tensor product multiplicity [Braverman
A., Finkelberg M., Private communication, 2008]. In this paper, we develop the
theory for the branching in quiver varieties and check this conjecture for
$G=\SL(l)$.


title: Chow groups of K3 surfaces and spherical objects

abstract:
  We show that for a K3 surface X the finitely generated subring R(X) of the
Chow ring introduced by Beauville and Voisin is preserved under derived
equivalences. This is proved by analyzing Chern characters of spherical
bundles. As for a K3 surface X defined over a number field all spherical
bundles on the associated complex K3 surface are defined over $\bar\QQ$, this
is compatible with the Bloch-Beilinson conjecture. Besides the work of
Beauville and Voisin, Lazarfeld's result on Brill-Noether theory for curves in
K3 surfaces and the deformation theory developed with Macri and Stellari in
arXiv:0710.1645 are central for the discussion.


title: Nuclear Charge Radii of Be-7,9,10 and the one-neutron halo nucleus Be-11

abstract:
  Nuclear charge radii of $^{7,9,10,11}$Be have been determined by
high-precision laser spectroscopy. On-line measurements were performed with
collinear laser spectroscopy in the $2s_{1/2} \to 2p_{1/2}$ transition on a
beam of Be$^{+}$ ions. Collinear and anticollinear laser beams were used
simultaneously and the absolute frequency determination using a frequency comb
yielded an accuracy in the isotope-shift measurements of about
  1 MHz. Combination with accurate calculations of the mass-dependent isotope
shifts yield nuclear charge radii. The charge radius decreases from $^7$Be to
$^{10}$Be and then increases for the halo nucleus $^{11}$Be. When comparing our
results with predictions of {\it ab initio} nuclear structure calculations we
find good agreement. Additionally, the nuclear magnetic moment of $^7$Be was
determined to be $-1.3995(5)\mu_{\rm N}$ and that of $^{11}$Be from a previous
$\beta$-NMR measurement was confirmed.


title: High-Redshift Starbursting Dwarf Galaxies Revealed by GRB Afterglows

abstract:
  We present a study of 15 long-duration gamma-ray burst (GRB) host galaxies at
z>2. The GRBs are selected with available early-time afterglow spectra in order
to compare interstellar medium (ISM) absorption-line properties with stellar
properties of the host galaxies. In addition to five previously studied hosts,
we consider new detections for the host galaxies of GRB050820 and GRB060206 and
place 2-sigma upper limits to the luminosities of the remaining unidentified
hosts. We examine the nature of the host galaxy population and find that (1)
the UV luminosity distribution of GRB host galaxies is consistent with
expectations from a UV luminosity weighted random galaxy population with a
median luminosity of <L(UV)>=0.1 L*; (2) there exists a moderate correlation
between UV luminosity and SiII 1526 absorption width, which together with the
observed large line widths of W(1526)>1.5 Ang for a large fraction of the
objects suggests a galactic outflow driven velocity field in the host galaxies;
(3) there is tentative evidence for a trend of declining ISM metallicity with
decreasing galaxy luminosity in the star-forming galaxy population at z=2-4;
(4) the interstellar UV radiation field is found ~ 35-350 times higher in GRB
hosts than the Galactic mean value; and (5) additional galaxies are found at <
2" from the GRB host in all fields with known presence of strong MgII
absorbers, but no additional faint galaxies are found at < 2" in fields without
strong MgII absorbers. Our study confirms that the GRB host galaxies (with
known optical afterglows) are representative of unobscured star-forming
galaxies at z>2, and demonstrates that high spatial resolution images are
necessary for an accurate identification of GRB host galaxies in the presence
of strong intervening absorbers.


title:
A Search for the Most Massive Galaxies. III. Global and Central
  Structure

abstract:
  We used the Advanced Camera for Surveys on board the Hubble Space Telescope
to obtain high resolution i-band images of the centers of 23 single galaxies,
which were selected because they have SDSS velocity dispersions larger than 350
km/s. The surface brightness profiles of the most luminous of these objects
(M_i<-24) have well-resolved `cores' on scales of 150-1000 pc, and share
similar properties to BCGs. The total luminosity of the galaxy is a better
predictor of the core size than is the velocity dispersion. The correlations of
luminosity and velocity dispersion with core size agree with those seen in
previous studies of galaxy cores. Because of high velocity dispersions, our
sample of galaxies can be expected to harbor the most massive black holes, and
thus have large cores with large amounts of mass ejection. The mass-deficits
inferred from core-Sersic fits to the surface-brightness profiles are
approximately double the black-hole masses inferred from the M_bh-sigma
relation and the same as those inferred from the M_bh-L relation. The less
luminous galaxies (M_i>-23) tend to have steeper `power-law' inner profiles,
higher-ellipticity, diskier isophotes, and bulge-to-total ratios of order 0.5
-- all of which suggest that they are `fast-rotators' and rotational motions
could have contaminated the velocity dispersion estimate. There are obvious
dust features within about 300 pc of the center in about 35% of the sample,
predominantly in power-law rather than core galaxies.


title:
Neutrino Masses, Baryon Asymmetry, Dark Matter and the Moduli Problem :
  A Complete Framework

abstract:
  Recent developments in string theory have led to "realistic" string
compactifications which lead to moduli stabilization while generating a
hierarchy between the Electroweak and Planck scales at the same time. However,
this seems to suggest a rethink of our standard notions of cosmological
evolution after the end of inflation and before the beginning of BBN. We argue
that within classes of realistic string compactifications, there generically
exists a light modulus with a mass comparable to that of the gravitino which
generates a large late-time entropy when it decays. Therefore, all known
mechanisms of generating the baryon asymmetry of the Universe in the literature
have to take this fact into account. In this work, we find that it is still
possible to naturally generate the observed baryon asymmetry of the Universe as
well as light left-handed neutrino masses from a period of Affleck-Dine(AD)
leptogenesis shortly after the end of inflation, in classes of realistic string
constructions with a minimal extension of the MSSM below the unification scale
(consisting only of right-handed neutrinos) and satisfying certain microscopic
criteria described in the text. The consequences are as follows. The lightest
left-handed neutrino is required to be virtually massless. The moduli
(gravitino) problem can be naturally solved in this framework both within
gravity and gauge mediation. The observed upper bound on the relic abundance
constrains the moduli-matter and moduli-gravitino couplings since the DM is
produced non-thermally within this framework. Finally, although not a definite
prediction, the framework naturally allows a light right-handed neutrino and
sneutrinos around the electroweak scale which could have important implications
for DM as well as the LHC.


title:
Stochastic dynamics of magnetization in a ferromagnetic nanoparticle out
  of equilibrium

abstract:
  We consider a small metallic particle (quantum dot) where ferromagnetism
arises as a consequence of Stoner instability. When the particle is connected
to electrodes, exchange of electrons between the particle and the electrodes
leads to a temperature- and bias-driven Brownian motion of the direction of the
particle magnetization. Under certain conditions this Brownian motion is
described by the stochastic Landau-Lifshitz-Gilbert equation. As an example of
its application, we calculate the frequency-dependent magnetic susceptibility
of the particle in a constant external magnetic field, which is relevant for
ferromagnetic resonance measurements.


title:
Type Ia supernovae and the acceleration of the universe: results from
  the ESSENCE Supernova Survey

abstract:
  The ESSENCE project was a six year supernova search carried out with the CTIO
4-m telescope. We also obtained spectra with many of the world's largest
ground-based telescopes and observed some of our SNe with the Hubble Space
Telescope and the Spitzer Space Telescope. We achieved our goal of discovering
over 200 Type Ia SNe in the redshift range 0.2 to 0.8. With these data we
determined the cosmic equation of state parameter to +/- 10 percent. The data
are consistent with a geometrically flat universe whose dark energy is
equivalent to Einstein's cosmological constant.


title: Chemical enrichment in the cluster of galaxies Hydra A

abstract:
  We analyzed global properties, radial profiles and 2D maps of the metal
abundances and temperature in the cool core cluster of galaxies Hydra A using a
deep XMM-Newton exposure. The best fit among the available spectral models is
provided by a Gaussian distribution of the emission measure (gdem). We can
accurately determine abundances for 7 elements in the cluster core with EPIC
and 3 elements with RGS. The gdem model gives lower Fe abundances than a single
temperature model. The abundance profiles for Fe, Si, S, but also O are
centrally peaked. Combining the Hydra A results with 5 other clusters for which
detailed chemical abundance studies are available, we find a significant
decrease of O with radius, while the increase in the O/Fe ratio with radius is
small within 0.1 r_200. We compare the observed abundance ratios with the
mixing of various supernova type Ia and core-collapse yield models in different
relative amounts. Producing the estimated O, Si and S peaks in Hydra A requires
either an amount of metals ejected by stellar winds 3-8 times higher than
predicted by available models or a remaining peak in the enrichment by
core-collapse supernovae from the protocluster phase. The temperature map shows
cooler gas extending in arm-like structures towards the north and south. These
structures appear to be richer in metals than the ambient medium and spatially
correlated with the large-scale radio lobes. We estimate the mass of cool gas,
which was probably uplifted by buoyant bubbles of relativistic plasma produced
by the AGN, to 1.6-6.1x10^9 M_sun, and the energy associated with this uplift
to 3.3-12.5x10^58 ergs. The best estimate of the mass of Fe uplifted together
with the cool gas is 1.7x10^7 M_sun, 15% of the total mass of Fe in the central
0.5arcmin region.


title: B_s mixing phase and lepton flavor violation in supersymmetric SU(5)

abstract:
  We inspect consequences of the latest B_s mixing phase measurements on lepton
flavor violation in a supersymmetric SU(5) theory. The O(1) phase, preferring a
non-vanishing squark mixing, generically implies tau -> (e + mu) gamma and mu
-> e gamma. Depending on the gaugino and the scalar mass parameters as well as
tan beta, the rates turn out to be detectable or even already excessive, if the
RR mass insertion of down-type squarks is nonzero. We find that it becomes easy
to reconcile B_s mixing phase with lepton flavor violation given: gaugino to
scalar squared mass ratio around 1/12, both LL and RR insertions with decent
sizes, and low tan beta.


title: Steady state of Stochastic Sandpile Models

abstract:
  We study the steady state of the abelian sandpile models with stochastic
toppling rules. The particle addition operators commute with each other, but in
general these operators need not be diagonalizable. We use their abelian
algebra to determine their eigenvalues, and the Jordan block structure. These
are then used to determine the probability of different configurations in the
steady state. We illustrate this procedure by explicitly determining the
numerically exact steady state for a one dimensional example, for systems of
size $\le12$, and also study the density profile in the steady state.


title:
Precise Orbital Tracking of an Asteroid with a Phased Array of Radio
  Transponders

abstract:
  Deflecting an asteroid from an Earth impact trajectory requires only small
velocity changes, typically of the order of microns per second, if done many
years ahead of time. For this, a highly precise method of determining the need,
magnitude, and direction of a deflection is required. Although the required
precision can be achieved by much less accurate extended observations, an
intrinsic resolution of $\mu $m/s permits the live monitoring of
nongravitational orbital perturbations (Yarkovsky effect), and of a deflection
effort itself. Here, it is proposed to deploy on the asteroid's surface
multiple radio units to form a phased array capable of measuring radial
velocities relative to Earth to about 1 $\mu$m/s and ranges to 5 m. The same
technology can also be used for scientific applications such as very-long
baseline radio astronomy, milli-Hertz gravitational wave detection, or mapping
of the solar wind.


title: How to measure a spinon Fermi surface

abstract:
  We propose an experiment to identify the potential existence of a spinon
Fermi surface by looking for oscillatory coupling between two ferromagnets via
a spin liquid spacer. Three candidate spin liquids are investigated, and it is
found that in all cases, long period oscillations should be present, the period
of which would identify the Fermi wavevector of the spinon surface.


title:
Sub-Riemannian calculus and monotonicity of the perimeter for graphical
  strips

abstract:
  We prove a monotonicity result at specific points for the Horizontal
Perimeter for a class of surfaces in the Heisenberg group.


title: Multi-Instantons and Multi-Cuts

abstract:
  We discuss various aspects of multi-instanton configurations in generic
multi-cut matrix models. Explicit formulae are presented in the two-cut case
and, in particular, we obtain general formulae for multi-instanton amplitudes
in the one-cut matrix model case as a degeneration of the two-cut case. These
formulae show that the instanton gas is ultra-dilute, due to the repulsion
among the matrix model eigenvalues. We exemplify and test our general results
in the cubic matrix model, where multi-instanton amplitudes can be also
computed with orthogonal polynomials. As an application, we derive general
expressions for multi-instanton contributions in two-dimensional quantum
gravity, verifying them by computing the instanton corrections to the string
equation. The resulting amplitudes can be interpreted as regularized partition
functions for multiple ZZ-branes, which take into full account their
back-reaction on the target geometry. Finally, we also derive structural
properties of the trans-series solution to the Painleve I equation.

categories: hep-th cond-mat.stat-mech math-ph math.MP nlin.SI


title: Emission from Large-scale Jets in Quasars

abstract:
  We consider the emission processes in the large-scale jets of powerful
quasars based on the results obtained with the VLA, Spitzer, Hubble, and
Chandra. We show that two well-known jets, 3C 273 and PKS 1136-135, have two
distinct spectral components on large-scales: (1) the low-energy (LE)
synchrotron spectrum extending from radio to infrared, and (2) the high-energy
(HE) component arising from optical and extending to X-rays. The X-ray emission
in quasar jets is often attributed to inverse-Compton scattering of cosmic
microwave background (CMB) photons by radio-emitting electrons in a highly
relativistic jet. However, recent data prefer synchrotron radiation by a second
distinct population as the origin of the HE component. We anticipate that
optical polarimetry with Hubble will establish the synchrotron nature of the HE
component. Gamma-ray observations with GLAST (renamed as the Fermi Gamma-ray
Space Telescope), as well as future TeV observations, are expected to place
important constraints on the jet models.


title:
Thermodynamic Properties of Kagome Antiferromagnets with different
  Perturbations

abstract:
  We discuss the results of several small perturbations to the thermodynamic
properties of Kagome Lattice Heisenberg Model (KLHM) at high and intermediate
temperatures, including Curie impurities, dilution, in-plane and out of plane
Dzyaloshinski-Moria (DM) anisotropies and exchange anisotropy. We examine the
combined role of Curie impurities and dilution in the behavior of uniform
susceptibility. We also study the changes in specific heat and entropy with
various anisotropies. Their relevance to newly discovered materials
ZnCu3(OH)6Cl2 is explored. We find that the magnetic susceptibility is well
described by about 6 percent impurity and dilution. We also find that the
entropy difference between the material and KLHM is well described by the DM
parameter D_z/J~0.1.


title: No purification for two copies of a noisy entangled state

abstract:
  We consider whether two copies of a noisy entangled state can be transformed
into a single copy of greater purity using local operations and classical
communication. We show that it is never possible to achieve such a purification
with certainty when the family of noisy states is twirlable (i.e. when there
exists a local transformation that maps all states into the family, yet leaves
the family itself invariant). This implies that two copies of a Werner state
cannot be deterministically purified. Furthermore, due to the construction of
the proof, it will hold not only in quantum theory, but in any generalised
probabilistic theory. We use this to show that two copies of a noisy PR-box (a
hypothetical device more non-local than is allowed by quantum theory) cannot be
purified.


title: The Radio Number of Gear Graphs

abstract:
  Let $d(u,v)$ denote the distance between two distinct vertices of a connected
graph $G$, and $\diam(G)$ be the diameter of $G$. A radio labeling $c$ of $G$
is an assignment of positive integers to the vertices of $G$ satisfying
$d(u,v)+|c(u)-c(v)|\geq \diam(G) + 1.$ The maximum integer in the range of the
labeling is its span. The radio number of $G$, $rn(G)$, is the minimum possible
span. The family of gear graphs of order $n$, $G_n$, consists of planar graphs
with $2n+1$ vertices and $3n$ edges. We prove that the radio number of the
$n$-gear is $4n+2$.


title:
SMA CO(2-1) Observations of CG30: A Protostellar Binary System with a
  High-Velocity Quadrupolar Molecular Outflow

abstract:
  We present interferometric observations in the 12CO (2-1) line and at 1.3 mm
dust continuum of the low-mass protostellar binary system in the cometary
globule CG30, using the Submillimeter Array. The dust continuum images resolve
two compact sources (CG30N and CG30S), with a linear separation of ~8700 AU and
total gas masses of ~1.4 and ~0.6 M_sun, respectively. With the CO images, we
discover two high-velocity bipolar molecular outflows, driven by the two
sources. The two outflows are nearly perpendicular to each other, showing a
quadrupolar morphology. The northern bipolar outflow extends along the
southeast (redshifted, with a velocity up to ~23 km/s) and northwest
(blueshifted, velocity up to ~30 km/s) directions, while the southern pair has
an orientation from southwest (blueshifted, velocity up to 13 km/s) to
northeast (redshifted, velocity up to ~41 km/s). The outflow mass of the
northern pair, driven by the higher mass source CG30N, is ~9 times larger than
that of the southern pair. The discovery of the quadrupolar molecular outflow
in the CG30 protobinary system, as well as the presence of other quadrupolar
outflows associated with binary systems, demonstrate that the disks in (wide)
binary systems are not necessarily co-aligned after fragmentation.


title:
Quantifying the cost of simultaneous non-parametric approximation of
  several samples

abstract:
  We consider the standard non-parametric regression model with Gaussian errors
but where the data consist of different samples. The question to be answered is
whether the samples can be adequately represented by the same regression
function. To do this we define for each sample a universal, honest and
non-asymptotic confidence region for the regression function. Any subset of the
samples can be represented by the same function if and only if the intersection
of the corresponding confidence regions is non-empty. If the empirical supports
of the samples are disjoint then the intersection of the confidence regions is
always non--empty and a negative answer can only be obtained by placing shape
or quantitative smoothness conditions on the joint approximation. Alternatively
a simplest joint approximation function can be calculated which gives a measure
of the cost of the joint approximation, for example, the number of extra peaks
required.


title: The Symmetry Preserving Removal Lemma

abstract:
  In this note we observe that in the hyper-graph removal lemma the edge
removal can be done in a way that the symmetries of the original hyper-graph
remain preserved. As an application we prove the following generalization of
Szemer\'edi's Theorem on arithmetic progressions. If in an Abelian group $A$
there are sets $S_1,S_2...,S_t$ such that the number of arithmetic progressions
$x_1,x_2,...,x_t$ with $x_i\in S_i$ is $o(|A|^2)$ then we can shrink each $S_i$
by $o(|A|)$ elements such that the new sets don't have such a diagonal
arithmetic progression.


title:
Dualization of the Hopf algebra of secondary cohomology operations and
  the Adams spectral sequence

abstract:
  We describe the dualization of the algebra of secondary cohomology operations
in terms of generators extending the Milnor dual of the Steenrod algebra. In
this way we obtain explicit formulae for the computation of the E_3-term of the
Adams spectral sequence converging to the stable homotopy groups of spheres.


title: Revisiting Event Horizon Finders

abstract:
  Event horizons are the defining physical features of black hole spacetimes,
and are of considerable interest in studying black hole dynamics. Here, we
reconsider three techniques to localise event horizons in numerical spacetimes:
integrating geodesics, integrating a surface, and integrating a level-set of
surfaces over a volume. We implement the first two techniques and find that
straightforward integration of geodesics backward in time to be most robust. We
find that the exponential rate of approach of a null surface towards the event
horizon of a spinning black hole equals the surface gravity of the black hole.
In head-on mergers we are able to track quasi-normal ringing of the merged
black hole through seven oscillations, covering a dynamic range of about 10^5.
Both at late times (when the final black hole has settled down) and at early
times (before the merger), the apparent horizon is found to be an excellent
approximation of the event horizon. In the head-on binary black hole merger,
only {\em some} of the future null generators of the horizon are found to start
from past null infinity; the others approach the event horizons of the
individual black holes at times far before merger.


title: A Quasar Wind Model

abstract:
  A quasar wind model is proposed to describe the spatial and velocity
structure of the broad line region. This model requires detailed
photoionization and magnetohydrodynamic simulation, as the broad line region it
too small for direct spatial resolution. The emission lines are Doppler
broadened, since the gas is moving at high velocity. The high velocity is
attained by the gas from a combination of radiative and magnetic driving
forces. Once this model is complete, the model predictions will be tested
against recent microlensing data in conjunction with diverse existing
observations.


title:
Two-electron ionization in strong laser fields below intensity
  threshold: signatures of attosecond timing in correlated spectra

abstract:
  We develop an analytical model of correlated two-electron ionization in
strong infrared laser fields. The model includes all relevant interactions
between the electrons, the laser field, and the ionic core nonperturbatively.
We focus on the deeply quantum regime, where the energy of the active electron
driven by the laser field is insufficient to collisionally ionize the parent
ion, and the assistance of the laser field is required to create a doubly
charged ion. In this regime, the electron-electron and the electron-ion
interactions leave distinct footprints in the correlated two-electron spectra,
recording the mutual dynamics of the escaping electrons.


title:
Effect of edge removal on topological and functional robustness of
  complex networks

abstract:
  We study the robustness of complex networks subject to edge removal. Several
network models and removing strategies are simulated. Rather than the existence
of the giant component, we use total connectedness as the criterion of
breakdown. The network topologies are introduced a simple traffic dynamics and
the total connectedness is interpreted not only in the sense of topology but
also in the sense of function. We define the topological robustness and the
functional robustness, investigate their combined effect and compare their
relative importance to each other. The results of our study provide an
alternative view of the overall robustness and highlight efficient ways to
improve the robustness of the network models.


title:
Scattering matrices and expansion coefficients of Martian analogue
  palagonite particles

abstract:
  We present measurements of ratios of elements of the scattering matrix of
Martian analogue palagonite particles for scattering angles ranging from 3 to
174 degrees and a wavelength of 632.8 nm. To facilitate the use of these
measurements in radiative transfer calculations we have devised a method that
enables us to obtain, from these measurements, a normalized synthetic
scattering matrix covering the complete scattering angle range from 0 to 180
degrees. Our method is based on employing the coefficients of the expansions of
scattering matrix elements into generalized spherical functions. The synthetic
scattering matrix elements and/or the expansion coefficients obtained in this
way, can be used to include multiple scattering by these irregularly shaped
particles in (polarized) radiative transfer calculations, such as calculations
of sunlight that is scattered in the dusty Martian atmosphere.


title:
Estimating radiative momentum transfer through a thermal analysis of the
  Pioneer Anomaly

abstract:
  A methodology based on point-like sources is discussed, enabling a reliable
estimate of the acceleration of the Pioneer 10 and 11 probes caused by thermal
effects. A sensitivity analysis of the several parameters of the model allows
for a clear indication of the possible thermal origin of the so-called Pioneer
anomaly.


title:
Normal Modes, Quasi-normal Modes and Super-radiant Modes for Scalar
  Fields in Kerr anti-de Sitter Spacetime

abstract:
  Normal modes, quasi-normal modes and super-radiant modes are studied to
clarify the total dynamics for complex scalar fields in Kerr anti-de Sitter
black hole spacetime. Orthonormal relations and quasi-orthonormal relations are
obtained for normal modes and quasi-normal modes. Mode expansions are done and
the conserved quantities are studied. Any modes are shown to be separated into
two groups, physical modes and unphysical modes, by the zero mode line. Zero
modes themselves do not exist as normalizable modes with the correct boundary
condition. The allowed physical modes exclude the super-radiant instability
modes in rotating black hole spacetime. The result is consistent with the
co-rotating frame consideration.


title: Complex Replica Zeros of $\pm J$ Ising Spin Glass at Zero Temperature

abstract:
  Zeros of the $n$th moment of the partition function $[Z^n]$ are investigated
in a vanishing temperature limit $\beta \to \infty$, $n \to 0$ keeping $y=\beta
n \sim O(1)$. In this limit, the moment parameterized by $y$ characterizes the
distribution of the ground-state energy. We numerically investigate the zeros
for $\pm J$ Ising spin glass models with several ladder and tree systems, which
can be carried out with a feasible computational cost by a symbolic operation
based on the Bethe--Peierls method. For several tree systems we find that the
zeros tend to approach the real axis of $y$ in the thermodynamic limit implying
that the moment cannot be described by a single analytic function of $y$ as the
system size tends to infinity, which may be associated with breaking of the
replica symmetry. However, examination of the analytical properties of the
moment function and assessment of the spin-glass susceptibility indicate that
the breaking of analyticity is relevant to neither one-step or full replica
symmetry breaking.


title:
Some generalizations of Cwikel-Lieb-Rozenblum and Lieb-Thirring
  inequalities

abstract:
  The paper is withdrawn by the authors and replaced be an improved and
extended version arxiv: 0812.2968


title: Line of sight depth of the Large and Small Magellanic Clouds

abstract:
  We used the red clump stars from the Optical Gravitational Lensing Experiment
(OGLE II) survey and the the Magellanic Cloud Photometric Survey (MCPS), to
estimate the line of sight depth. The observed dispersion in the magnitude and
colour distribution of red clump stars is used to estimate the line of sight
depth, after correcting for the contribution due to other effects. This
dispersion due to depth, has a range from minimum dispersion that can be
estimated, to 0.46 mag (a depth of 500 pc to 10.44 Kpc), in the LMC. In the
case of SMC, the dispersion ranges from minimum dispersion to 0.35 magnitude (a
depth of 665 pc to 9.53 Kpc). The thickness profile of LMC bar indicates that
it is flared. The average depth in the bar region is 4.0$\pm$1.4 kpc. The halo
of the LMC (using RR Lyrea stars) is found to have larger depth compared to the
disk/bar, which supports the presence of inner halo for the LMC. The large
depth estimated for the LMC bar and the disk suggests that the LMC might have
had minor mergers. In the case of SMC, the bar depth (4.90$\pm$1.23 Kpc) and
the disk depth (4.23$\pm$1.48 Kpc) are found to be within the standard
deviations. We find evidence for increase in depth near the optical center (up
to 9 kpc). On the other hand, the estimated depth for the halo (RR Lyrea stars)
and disk (RC stars) for the bar region of the SMC is found to be similar. Thus,
increased depth and enhanced stellar as well as HI density near the optical
center suggests that the SMC may have a bulge.


title:
Search for Near-Infrared Pulsation of the Anomalous X-ray Pulsar 4U
  0142+61

abstract:
  We have searched for pulsation of the anomalous X-ray pulsar (AXP) 4U 0142+61
in the K' band ($\lambda_{\rm eff} = 2.11$ $\mu$m) using the fast-readout mode
of IRCS at the Subaru 8.2-m telescope. We found no significant signal at the
pulse frequency expected by the precise ephemeris obtained by the X-ray
monitoring observation with RXTE. Nonetheless, we obtained a best upper limit
of 17% (90% C.L.) for the root-mean-square pulse fraction in the K' band.
Combined with i' band pulsation (Dhillon et al. 2005), the slope of the pulsed
component ($F_\nu \propto \nu^\alpha$) was constrained to $\alpha > -0.87$ (90%
C.L.) for an interstellar extinction of $A_{V} = 3.5$.


title: Code diversity in multiple antenna wireless communication

abstract:
  The standard approach to the design of individual space-time codes is based
on optimizing diversity and coding gains. This geometric approach leads to
remarkable examples, such as perfect space-time block codes, for which the
complexity of Maximum Likelihood (ML) decoding is considerable. Code diversity
is an alternative and complementary approach where a small number of feedback
bits are used to select from a family of space-time codes. Different codes lead
to different induced channels at the receiver, where Channel State Information
(CSI) is used to instruct the transmitter how to choose the code. This method
of feedback provides gains associated with beamforming while minimizing the
number of feedback bits. It complements the standard approach to code design by
taking advantage of different (possibly equivalent) realizations of a
particular code design. Feedback can be combined with sub-optimal low
complexity decoding of the component codes to match ML decoding performance of
any individual code in the family. It can also be combined with ML decoding of
the component codes to improve performance beyond ML decoding performance of
any individual code. One method of implementing code diversity is the use of
feedback to adapt the phase of a transmitted signal as shown for 4 by 4
Quasi-Orthogonal Space-Time Block Code (QOSTBC) and multi-user detection using
the Alamouti code. Code diversity implemented by selecting from equivalent
variants is used to improve ML decoding performance of the Golden code. This
paper introduces a family of full rate circulant codes which can be linearly
decoded by fourier decomposition of circulant matrices within the code
diversity framework. A 3 by 3 circulant code is shown to outperform the
Alamouti code at the same transmission rate.


title:
Intermediate states at structural phase transition: Model with a
  one-component order parameter coupled to strains

abstract:
  We study a Ginzburg-Landau model of structural phase transition in two
dimensions, in which a single order parameter is coupled to the tetragonal and
dilational strains. Such elastic coupling terms in the free energy much affect
the phase transition behavior particularly near the tricriticality. A
characteristic feature is appearance of intermediate states, where the ordered
and disordered regions coexist on mesoscopic scales in nearly steady states in
a temperature window. The window width increases with increasing the strength
of the dilational coupling. It arises from freezing of phase ordering in
inhomogeneous strains. No impurity mechanism is involved. We present a simple
theory of the intermediate states to produce phase diagrams consistent with
simulation results.


title: Phenomenological survey of free fermionic heterotic-string models

abstract:
  A glossary overview of the phenomenological studies of quasi-realistic free
fermionic heterotic string models is presented. I elaborate on the
correspondence of these models with Z2XZ2 orbifolds.


title: Second Quantized Kolmogorov Complexity

abstract:
  The Kolmogorov complexity of a string is the length of its shortest
description. We define a second quantised Kolmogorov complexity where the
length of a description is defined to be the average length of its
superposition. We discuss this complexity's basic properties. We define the
corresponding prefix complexity and show that the inequalities obeyed by this
prefix complexity are also obeyed by von Neumann entropy.


title: Loop-erased random walk and Poisson kernel on planar graphs

abstract:
  Lawler, Schramm and Werner showed that the scaling limit of the loop-erased
random walk on $\mathbb{Z}^2$ is $\mathrm{SLE}_2$. We consider scaling limits
of the loop-erasure of random walks on other planar graphs (graphs embedded
into $\mathbb{C}$ so that edges do not cross one another). We show that if the
scaling limit of the random walk is planar Brownian motion, then the scaling
limit of its loop-erasure is $\mathrm{SLE}_2$. Our main contribution is showing
that for such graphs, the discrete Poisson kernel can be approximated by the
continuous one. One example is the infinite component of super-critical
percolation on $\mathbb{Z}^2$. Berger and Biskup showed that the scaling limit
of the random walk on this graph is planar Brownian motion. Our results imply
that the scaling limit of the loop-erased random walk on the super-critical
percolation cluster is $\mathrm{SLE}_2$.


title: Axionic Mirage Mediation

abstract:
  In this talk, we propose a model of mirage mediation, in which Peccei-Quinn
symmetry is incorporated. In this \textit{axionic mirage mediation}, it is
shown that the Peccei-Quinn symmetry breaking scale is dynamically determined
around $10^{10}$ GeV to $10^{12}$ GeV due to the supersymmetry breaking
effects. The problems in the original mirage mediation such as the
$\mu$-problem and the moduli problem can be solved simultaneouly. Furthermore,
in our model the axino, which is the superpartner of the axion, is the lightest
sparticle.


title: Matrix Reduction and the su(2|2) superalgebra in AdS/CFT

abstract:
  We study the supersymmetry generators Q, S on the 1-loop vectorless sector of
N=4 Super Yang-Mills, by reduction to the plane-wave matrix model. Using a
coherent basis in the su(2|2) sector, a comparison with the algebra given by
Beisert in nlin/0610017 is presented, and some parameters (up to one-loop) are
determined. We make a final comparison of these supercharges with the results
that can be obtained from the string action by working in the light-cone-gauge
and discretizing the string.


title: Local light-ray rotation

abstract:
  We present a sheet structure that rotates the local ray direction through an
arbitrary angle around the sheet normal. The sheet structure consists of two
parallel Dove-prism sheets, each of which flips one component of the local
direction of transmitted light rays. Together, the two sheets rotate
transmitted light rays around the sheet normal. We show that the direction
under which a point light source is seen is given by a Mobius transform. We
illustrate some of the properties with movies calculated by ray-tracing
software.


title: Finite number of Kaluza-Klein modes, all with zero masses

abstract:
  Kaluza-Klein modes of fermions in a 5-dimensional toy model are considered.
The number of Kaluza-Klein modes that survive after integration over extra
dimensions is finite in this space. Moreover the extra dimensional piece of the
kinetic term induces no mass for the higher Kaluza-Klein modes on contrary to
the standard lore.


title:
Edge Effect on Electronic Transport Properties of Graphene Nanoribbons
  and Presence of Perfectly Conducting Channel

abstract:
  Numerical calculations have been performed to elucidate unconventional
electronic transport properties in disordered nanographene ribbons with zigzag
edges (zigzag ribbons). The energy band structure of zigzag ribbons has two
valleys that are well separated in momentum space, related to the two Dirac
points of the graphene spectrum. The partial flat bands due to edge states make
the imbalance between left- and right-going modes in each valley, {\it i.e.}
appearance of a single chiral mode. This feature gives rise to a perfectly
conducting channel in the disordered system, i.e. the average of conductance
$<g>$ converges exponentially to 1 conductance quantum per spin with increasing
system length, provided impurity scattering does not connect the two valleys,
as is the case for long-range impurity potentials. Ribbons with short-range
impurity potentials, however, through inter-valley scattering, display ordinary
localization behavior. Symmetry considerations lead to the classification of
disordered zigzag ribbons into the unitary class for long-range impurities, and
the orthogonal class for short-range impurities. The electronic states of
graphene nanoribbons with general edge structures are also discussed, and it is
demonstrated that chiral channels due to the edge states are realized even in
more general edge structures except for armchair edges.


title:
Dense granular flows: two-particle argument accounts for friction-like
  constitutive law with threshold

abstract:
  A scalar constitutive law is obtained for dense granular flows, both in the
inertial regime where the grain inertia dominates, and in the viscous regime.
Considering a pair of grains rather than a single grain, the classical
arguments yield a constitutive law that exhibits a flow threshold expressed as
a finite effective friction at flow onset. The value of the threshold is not
predicted. The resulting law seems to be compatible with existing data,
provided the saturation at high velocity (collisional regime) is added
empirically. The law is not exactly the same in both regimes, which seems to
indicate that there is no "universal" law.


title:
On Verifiable Sufficient Conditions for Sparse Signal Recovery via
  $\ell_1$ Minimization

abstract:
  We propose novel necessary and sufficient conditions for a sensing matrix to
be "$s$-good" - to allow for exact $\ell_1$-recovery of sparse signals with $s$
nonzero entries when no measurement noise is present. Then we express the error
bounds for imperfect $\ell_1$-recovery (nonzero measurement noise, nearly
$s$-sparse signal, near-optimal solution of the optimization problem yielding
the $\ell_1$-recovery) in terms of the characteristics underlying these
conditions. Further, we demonstrate (and this is the principal result of the
paper) that these characteristics, although difficult to evaluate, lead to
verifiable sufficient conditions for exact sparse $\ell_1$-recovery and to
efficiently computable upper bounds on those $s$ for which a given sensing
matrix is $s$-good. We establish also instructive links between our approach
and the basic concepts of the Compressed Sensing theory, like Restricted
Isometry or Restricted Eigenvalue properties.


title: Largest Empty Circle Centered on a Query Line

abstract:
  The Largest Empty Circle problem seeks the largest circle centered within the
convex hull of a set $P$ of $n$ points in $\mathbb{R}^2$ and devoid of points
from $P$. In this paper, we introduce a query version of this well-studied
problem. In our query version, we are required to preprocess $P$ so that when
given a query line $Q$, we can quickly compute the largest empty circle
centered at some point on $Q$ and within the convex hull of $P$.
  We present solutions for two special cases and the general case; all our
queries run in $O(\log n)$ time. We restrict the query line to be horizontal in
the first special case, which we preprocess in $O(n \alpha(n) \log n)$ time and
space, where $\alpha(n)$ is the slow growing inverse of the Ackermann's
function. When the query line is restricted to pass through a fixed point, the
second special case, our preprocessing takes $O(n \alpha(n)^{O(\alpha(n))} \log
n)$ time and space. We use insights from the two special cases to solve the
general version of the problem with preprocessing time and space in $O(n^3 \log
n)$ and $O(n^3)$ respectively.


title:
Anomalous behavior of the Kramers rate at bifurcations in classical
  field theories

abstract:
  We consider a Ginzburg-Landau partial differential equation in a bounded
interval, perturbed by weak spatio-temporal noise. As the interval length
increases, a transition between activation regimes occurs, in which the
classical Kramers rate diverges [R.S. Maier and D.L. Stein, Phys. Rev. Lett.
87, 270601 (2001)]. We determine a corrected Kramers formula at the transition
point, yielding a finite, though noise-dependent prefactor, confirming a
conjecture by Maier and Stein [vol. 5114 of SPIE Proceeding (2003)]. For both
periodic and Neumann boundary conditions, we obtain explicit expressions of the
prefactor in terms of Bessel and error functions.


title:
Dense granular flows: interpolating between grain inertia and fluid
  viscosity based constitutive laws

abstract:
  A scalar constitutive law was recently obtained for dense granular flows from
a two-grain argument, both in the inertial regime (grain inertia) and in the
viscous regime. As the resulting law is not exactly the same in both regimes,
we here provide an expression for the crossover between both regimes.


title:
Logarithmic Sobolev inequalities: regularizing effect of L\'evy
  operators and asymptotic convergence in the L\'evy-Fokker-Planck equation

abstract:
  In this paper we study some applications of the L\'evy logarithmic Sobolev
inequality to the study of the regularity of the solution of the fractal heat
equation, i. e. the heat equation where the Laplacian is replaced with the
fractional Laplacian. It is also used to the study of the asymptotic behaviour
of the L\'evy-Ornstein-Uhlenbeck process.


title:
Simulations de l'\'ecoulement turbulent marin avec un mod\`ele de
  d\'econvolution

abstract:
  We display a continous equation for the deconvolution process that
generalizes the Van Cittert algorithm in the case of oceanic boundary
conditions for a given fixed wind. We deduce a LES model for which we have
existence and uniqueness of a strong solution. Finally, we display several
numerical simulations showing the practical interest of the model.


title:
Microscopic Bardeen-Cooper-Schrieffer formulation of the critical
  temperature of multilayer copper-oxide superconductors

abstract:
  We study superconductivity in multilayer copper oxides, in the frame of a
realistic microscopic formulation. Solving the full temperature dependent BCS
gap equations, we obtain a maximum in the transition temperature Tc for M=3 or
4 CuO2 layers in the unit cell for appropriate values of the interlayer
tunneling (negative pair tunneling), and via the consideration of the doping
imbalance between the inner and outer layers. This is the ubiquitous
experimental result for Ca intercalated copper oxides, as opposed to other
intercalating elements. Further, using a restricted set of parameters, we
obtain an exact fit of Tc(M=1-4) for five different Ca intercalated homologuous
copper oxide families.


title: Relativistic Shock Acceleration: A Hartree-Fock Approach

abstract:
  We examine the problem of particle acceleration at a relativistic shocks
assuming pitch-angle scattering and using a Hartree-Fock method to approximate
the associated eigenfunctions. This leads to a simple transcendental equation
determining the power-law index, $s$, given the up and downstream velocities.
We compare our results with accurate numerical solutions obtained using the
eigenfunction method. In addition to the power-law index this method yields the
angular and spatial distributions upstream of the shock.


title:
The fate of pion condensation in quark matter: from the chiral limit to
  the physical pion mass

abstract:
  We study aspects of the pion condensation in two-flavor neutral quark matter
using the Nambu--Jona-Lasinio model of QCD at finite density. We investigate
the role of electric charge neutrality, and explicit symmetry breaking via
quark mass, both of which control the onset of the charged pion $(\pi^c)$
condensation. We show that the equality between the electric chemical potential
and the in-medium pion mass, $\mu_{e}=M_{\pi^-}$, as a threshold, persists even
for a composite pion system in the medium, provided the transition to the pion
condensed phase is of the second order. Moreover, we find that the pion
condensate in neutral quark matter is extremely fragile to the symmetry
breaking effect via a current quark mass $m$, and is ruled out for $m$ larger
than the order of 10 keV.


title:
On the `Stationary Implies Axisymmetric' Theorem for Extremal Black
  Holes in Higher Dimensions

abstract:
  All known stationary black hole solutions in higher dimensions possess
additional rotational symmetries in addition to the stationary Killing field.
Also, for all known stationary solutions, the event horizon is a Killing
horizon, and the surface gravity is constant. In the case of non-degenerate
horizons (non-extremal black holes), a general theorem was previously
established [gr-qc/0605106] proving that these statements are in fact generally
true under the assumption that the spacetime is analytic, and that the metric
satisfies Einstein's equation. Here, we extend the analysis to the case of
degenerate (extremal) black holes. It is shown that the theorem still holds
true if the vector of angular velocities of the horizon satisfies a certain
"diophantine condition," which holds except for a set of measure zero.


title:
Interface heat transfer between crossing carbon nanotubes, and the
  thermal conductivity of nanotube pellets

abstract:
  We theoretically compute the interface thermal resistance between crossing
single walled carbon nanotubes of various chiralities, using an atomistic
Green's function approach with semi-empirical potentials. The results are then
used to model the thermal conductivity of three dimensional nanotube pellets in
vacuum. For an average nanotube length of 1 $\mu$m, the model yields an upper
bound for the thermal conductivity of densely compacted pellets, of the order
of a few W/m-K. This is in striking contrast with the ultra-high thermal
conductivity reported on individually suspended nanotubes. The results suggest
that nanotube pellets might have an application as thermal insulators.


title: Pade Unitarizations: A Critical Look

abstract:
  We use the Linear Sigma Model to test the convergence of different sequences
of Pade Approximants when used to unitarize the low energy pi-pi scattering
amplitude. We find that, in this particular case, diagonal sequences reproduce
the sigma pole with high accuracy, as opposed to other sequences that have been
discussed extensively.


title:
Effect of the Dielectric-Constant Mismatch and Magnetic Field on the
  Binding Energy of Hydrogenic Impurities in a Spherical Quantum Dot

abstract:
  Within the effective mass approximation and variational method the effect of
dielectric constant mismatch between the size-quantized semiconductor sphere,
coating and surrounding environment on impurity binding energy in both the
absence and presence of a magnetic field is considered. The dependences of the
binding energy of a hydrogenic on-center impurity on the sphere and coating
radii, alloy concentration, dielectric-constant mismatch, and magnetic field
intensity are found for the GaAs-Ga_(1-x)Al_(x)As-AlAs (or vacuum) system.


title: Electromechanical Effect in Complex Plasmas

abstract:
  Experimental results on an auto-oscillatory pattern observed in a complex
plasma are presented. The experiments are performed with an argon plasma which
is produced under microgravity conditions using a capacitively-coupled rf
discharge at low power and gas pressure. The observed intense wave activity in
the complex plasma cloud correlates well with the low-frequency modulation of
the discharge voltage and current and is initiated by periodic void
contractions. Particle migrations forced by the waves are of long-range
repulsive and attractive character.


title: Balance laws with integrable unbounded sources

abstract:
  We consider the Cauchy problem for a $n\times n$ strictly hyperbolic system
of balance laws $$ \{{array}{c} u_t+f(u)_x=g(x,u), x \in \mathbb{R}, t>0
u(0,.)=u_o \in L^1 \cap BV(\mathbb{R}; \mathbb{R}^n), | \lambda_i(u)| \geq c >
0 {for all} i\in \{1,...,n\}, \|g(x,\cdot)\|_{\mathbf{C}^2}\leq \tilde M(x) \in
L1, {array}. $$ each characteristic field being genuinely nonlinear or linearly
degenerate. Assuming that the $\mathbf{L}^1$ norm of
$\|g(x,\cdot)\|_{\mathbf{C}^1}$ and $\|u_o\|_{BV(\reali)}$ are small enough, we
prove the existence and uniqueness of global entropy solutions of bounded total
variation extending the result in [1] to unbounded (in $L^\infty$) sources.
Furthermore, we apply this result to the fluid flow in a pipe with
discontinuous cross sectional area, showing existence and uniqueness of the
underlying semigroup.


title:
Optical properties of High-Mass X-ray Binaries (HMXB) in the Small
  Magellanic Cloud

abstract:
  The SMC represents an exciting opportunity to observe the direct results of
tidal interactions on star birth. One of the best indicators of recent star
birth activity is the presence of signicant numbers of High-Mass X-ray Binaries
(HMXBs) - and the SMC has them in abundance! We present results from nearly 10
years of monitoring these systems plus a wealth of other ground-based optical
data. Together they permit us to build a picture of a galaxy with a mass of
only a few percent of the Milky Way but with a more extensive HMXB population.
However, as often happens, new discoveries lead to some challenging puzzles -
where are the other X-ray binaries (eg black hole systems) in the SMC? And why
do virtually all the SMC HMXBs have Be starcompanions? The evidence arising
from these extensive optical observations for this apparently unusual stellar
evolution are discussed.


title:
High energy scattering in the saturation regime including running
  coupling and rare fluctuation effects

abstract:
  The analytic result for the $S$-matrix in the saturation regime including the
running coupling is obtained. To get this result we solve the Balitsky and
Kovchegov-Weigert evolution equations in the saturation regime, which include
running coupling corrections. We study also the effect of rare fluctuations on
top of the running coupling. We find that the rare fluctuations are less
important in the running coupling case as compared to the fixed coupling case.


title:
Collective modes of doped graphene and a standard 2DEG in a strong
  magnetic field: linear magneto-plasmons versus magneto-excitons

abstract:
  A doped graphene layer in the integer quantum Hall regime reveals a highly
unusual particle-hole excitation spectrum, which is calculated from the
dynamical polarizability in the random phase approximation. We find that the
elementary neutral excitations in graphene in a magnetic field are unlike those
of a standard two-dimensional electron gas (2DEG): in addition to the
upper-hybrid mode, the particle-hole spectrum is reorganized in linear
magneto-plasmons that disperse roughly parallel to $\omega=v_F q$, instead of
the usual horizontal (almost dispersionless) magneto-excitons. These modes
could be detected in an inelastic light scattering experiment.


title: Drag Force of Moving Quark at The N=2 Supergravity

abstract:
  In this paper we consider a moving quark in the thermal plasma at the N=2
Supergravity theory. By using the AdS/CFT correspondence we obtain energy loss
of the quark. Then we consider the higher derivative corrections in charged
AdS-black hole and calculate the drag force of the moving quark in the thermal
plasma. Also we find a limit which N=2 Supergravity solutions are
correspondening to the N=4 Super Yang-Mills solutions for the heavy quark.


title: Underlying events in Herwig++

abstract:
  In this contribution we describe the new model of multiple partonic
interactions (MPI) that has been implemented in Herwig++. Tuning its two free
parameters is enough to find a good description of CDF underlying event data.
We show extrapolations to the LHC and compare them to results from other
models.


title: Deeply virtual Compton scattering off nuclei

abstract:
  Deeply virtual Compton scattering (DVCS) is the golden exclusive channel for
the study of the partonic structure of hadrons, within the universal framework
of generalized parton distributions (GPDs). This paper presents the aim and
general ideas of the DVCS experimental program off nuclei at the Jefferson
Laboratory. The benefits of the study of the coherent and incoherent channels
to the understanding of the EMC (European Muon Collaboration) effect are
discussed, along with the case of nuclear targets to access neutron GPDs.


title: Quantum entanglement and interference from classical statistics

abstract:
  Quantum mechanics for a four-state-system is derived from classical
statistics. Entanglement, interference, the difference between identical
fermions or bosons and the unitary time evolution find an interpretation within
a classical statistical ensemble. Quantum systems are subsystems of larger
classical statistical systems, which include the environment or the vacuum.
They are characterized by incomplete statistics in the sense that the classical
correlation function cannot be used for sequences of measurements in the
subsystem.


title: Commissioning and Performance of the ATLAS Liquid Argon Calorimeters

abstract:
  The ATLAS liquid argon (LAr) calorimeter system consists of an
electromagnetic barrel calorimeter and two end-caps with electromagnetic,
hadronic and forward calorimeters. The construction of the full calorimeter
system is completed since mid-2004. The detector has been operated with LAr at
nominal high voltage and fully equipped with readout electronics. Online
software, monitoring tools and offline signal reconstruction have been
developed for data collection and processing. Extensive tests with calibration
pulses have been carried out, and the electronics calibration scheme for all
182468 channels has been exercised. Since Augst 2006, cosmic muon data have
been collected together with the rest of the ATLAS detector system as part of
the ATLAS commissioning program. The reconstructed LAr signals from energy
deposited by cosmic rays are compared to the prediction derived from measured
detector parameters and calibration pulses. The uniformity of the detector
response within regions that have sufficient cosmic muons are examined. The
expected performance of the LAr calorimeter for ATLAS physics, based on
previous beam tests and Monte Carlo simulation, is also summarised.


title:
Derivation of Green's Function of Spin Calogero-Sutherland Model by
  Uglov's Method

abstract:
  Hole propagator of spin 1/2 Calogero-Sutherland model is derived using
Uglov's method, which maps the exact eigenfunctions of the model, called
Yangian Gelfand-Zetlin basis, to a limit of Macdonald polynomials (gl_2-Jack
polynomials). To apply this mapping method to the calculation of 1-particle
Green's function, we confirm that the sum of the field annihilation operator on
Yangian Gelfand-Zetlin basis is transformed to the field annihilation operator
on gl_2-Jack polynomials by the mapping. The resultant expression for hole
propagator for finite-size system is written in terms of renormalized momenta
and spin of quasi-holes and the expression in the thermodynamic limit coincides
with the earlier result derived by another method. We also discuss the
singularity of the spectral function for a specific coupling parameter where
the hole propagator of spin Calogero-Sutherland model becomes equivalent to
dynamical colour correlation function of SU(3) Haldane-Shastry model.


title:
Integration of Grassmann variables over invariant functions on flat
  superspaces

abstract:
  We study integration over functions on superspaces. These functions are
invariant under a transformation which maps the whole superspace onto the part
of the superspace which only comprises purely commuting variables. We get a
compact expression for the differential operator with respect to the commuting
variables which results from Berezin integration over all Grassmann variables.
Also, we derive Cauchy--like integral theorems for invariant functions on
supervectors and symmetric supermatrices. This extends theorems partly derived
by other authors. As an physical application, we calculate the generating
function of the one--point correlation function in random matrix theory.
Furthermore, we give another derivation of supermatrix Bessel--functions for
U(k_1/k_2).


title: Superfluid Fermi liquid in a unitary regime

abstract:
  A short popular review of theoretical and experimental results about
properties of ultracold Fermi gases in vicinity of the Feshbach resonance is
presented. The paper is based on the authors talk on the meeting of the
Physical Department of the Russian Academy of Sciences dedicated to 100th
anniversary of the birth of L. D. Landau (Moscow, January 22, 2008). A version
of this article has been published in Physics - Uspekhi v. 51 p. 603 (2008).


title: Coulomb suppression of the stellar enhancement factor

abstract:
  It is commonly assumed that reaction measurements for astrophysics should be
preferably performed in the direction of positive Q value to minimize the
impact of the stellar enhancement factor, i.e. the difference between the
laboratory rate and the actual stellar rate. We show that the stellar effects
can be minimized in the charged particle channel, even when the reaction Q
value is negative. As a demonstration, the cross section of the astrophysically
relevant 85Rb(p,n)85Sr reaction has been measured by activation between 2.16 <
Ec.m. < 3.96 MeV and the astrophysical reaction rate for (p,n) as well as (n,p)
is directly inferred from the data. The presented arguments are also relevant
for other alpha and proton-induced reactions in the p and rp processes.
Additionally, our results confirm a previously derived modification of a global
optical proton potential.


title:
The clustering and abundance of star-forming and passive galaxies at $z
  \sim 2$

abstract:
  We use the UKIDSS Ultra-deep survey (UDS), currently the deepest panoramic
near infra-red survey, together with deep Subaru optical imaging to measure the
clustering, number counts and luminosity function of galaxies at $z\sim 2$
selected using the BzK selection technique. We find that both star-forming
(sBzK) and passive (pBzK) galaxies, to a magnitude limit of $K_{AB} < 23$, are
strongly clustered. The passive galaxies are the most strongly clustered
population, with scale lengths of $r_0 = 15.0^{+1.9}_{-2.2}$h$^{-1}$Mpc
compared with $r_0 = 6.75^{+0.34}_{-0.37}$h$^{-1}$Mpc for star-forming
galaxies. The direct implication is that passive galaxies inhabit the most
massive dark-matter halos, and are thus identified as the progenitors of the
most massive galaxies at the present day. In addition, the pBzKs exhibit a
sharp flattening and potential turn-over in their number counts, in agreement
with other recent studies. This plateau cannot be explained by the effects of
incompleteness. We conclude that only very massive galaxies are undergoing
passive evolution at this early epoch, consistent with the downsizing scenario
for galaxy evolution. Assuming a purely passive evolution for the pBzKs from
their median redshift to the present day, their luminosity function suggests
that only $\sim 2.5 %$ of present day massive ellipticals had a pBzK as a main
progenitor.


title: The solution of tachyon inflation in curved universe

abstract:
  In this paper, we have considered the curved universe which is filled by
tachyonic field. We have found the exact solutions for the field, pressure,
density, and scale factor and some cosmological parameters. In such universe,
we have investigated the role of tachyonic field in different stages of k for
the evolution of the universe. Finally we draw the graphs for the scale factor,
Hubble's parameter, energy density, pressure, acceleration parameter, equation
of state and potential for the different values of k. Also we obtained the
exact form of field which shows that the tachyonic field has the kink form.


title: Geometric aspects of transversal Killing spinors on Riemannian flows

abstract:
  We study a Killing spinor type equation on spin Riemannian flows. We prove
integrability conditions and partially classify those Riemannian flows $M$
carrying non-trivial solutions to that equation in case $M$ is a local
Riemannian product, a Sasakian manifold or 3-dimensional.


title:
Mathematical Tool of Discrete Dynamic Modeling of Complex Systems in
  Control Loop

abstract:
  In this paper we present a method of discrete modeling and analysis of
multi-level dynamics of complex large-scale hierarchical dynamic systems
subject to external dynamic control mechanism. In a model each state describes
parallel dynamics and simultaneous trends of changes in system parameters. The
essence of the approach is in analysis of system state dynamics while it is in
the control loop.


title:
On the definition of equilibrium and non-equilibrium states in dynamical
  systems

abstract:
  We propose a definition of equilibrium and non-equilibrium states in
dynamical systems on the basis of the time average. We show numerically that
there exists a non-equilibrium non-stationary state in the coupled modified
Bernoulli map lattice.


title:
Pioneer 10 Doppler data analysis: disentangling periodic and secular
  anomalies

abstract:
  This paper reports the results of an analysis of the Doppler tracking data of
Pioneer probes which did show an anomalous behaviour. A software has been
developed for the sake of performing a data analysis as independent as possible
from that of J. Anderson et al. \citep{anderson}, using the same data set. A
first output of this new analysis is a confirmation of the existence of a
secular anomaly with an amplitude about 0.8 nms$^{-2}$ compatible with that
reported by Anderson et al. A second output is the study of periodic variations
of the anomaly, which we characterize as functions of the azimuthal angle
$\varphi$ defined by the directions Sun-Earth Antenna and Sun-Pioneer. An
improved fit is obtained with periodic variations written as the sum of a
secular acceleration and two sinusoids of the angles $\varphi$ and $2\varphi$.
The tests which have been performed for assessing the robustness of these
results are presented.


title:
Apply current exponential de Finetti theorem to realistic quantum key
  distribution

abstract:
  In the realistic quantum key distribution (QKD), Alice and Bob respectively
get a quantum state from an unknown channel, whose dimension may be unknown.
However, while discussing the security, sometime we need to know exact
dimension, since current exponential de Finetti theorem, crucial to the
information-theoretical security proof, is deeply related with the dimension
and can only be applied to finite dimensional case. Here we address this
problem in detail. We show that if POVM elements corresponding to Alice and
Bob's measured results can be well described in a finite dimensional subspace
with sufficiently small error, then dimensions of Alice and Bob's states can be
almost regarded as finite. Since the security is well defined by the smooth
entropy, which is continuous with the density matrix, the small error of state
actually means small change of security. Then the security of
unknown-dimensional system can be solved. Finally we prove that for heterodyne
detection continuous variable QKD and differential phase shift QKD, the
collective attack is optimal under the infinite key size case.


title: The Seiberg-Witten map and supersymmetry

abstract:
  The lack of any local solution to the first-order-in-h omegamn Seiberg-Witten
(SW) map equations for U(1) vector superfields compels us to obtain the most
general solution to those equations that is a quadratic polynomial in the
ordinary vector superfield, v, its chiral and antichiral projections and the
susy covariant derivatives of them all. Furnished with this solution, which is
local in the susy Landau gauge, we construct an ordinary dual of noncommutative
U(1) SYM in terms of ordinary fields which carry a linear representation of the
N=1 susy algebra. By using the standard SW map for the N=1 U(1) gauge
supermultiplet we define an ordinary U(1) gauge theory which is dual to
noncommutative U(1) SYM in the WZ gauge. We show that the ordinary dual so
obtained is supersymmetric, for, as we prove as we go along, the ordinary gauge
and fermion fields that we use to define it carry a nonlinear representation of
the N=1 susy algebra. We finally show that the two ordinary duals of
noncommutative U(1) SYM introduced above are actually the same N=1 susy gauge
theory. We also show in this paper that the standard SW map is never the theta
theta--bar component of a local superfield in v and check that, at least at a
given approximation, a suitable field redefinition of that map makes the
noncommutative and ordinary --in a Bmn field-- susy U(1) DBI actions
equivalent.


title:
Magnetic field induced non-Fermi liquid to Fermi liquid crossover at the
  quantum critical point of YbCu$_{5-x}$Au$_{x}$

abstract:
  The temperature (T) dependence of the muon and $^{63}$Cu nuclear spin-lattice
relaxation rates $1/T_1$ in YbCu4.4Au0.6 is reported over nearly four decades.
It is shown that for $T\to 0$ $1/T_1$ diverges following the behaviour
predicted by the self-consistent renormalization (SCR) theory developed by
Moriya for a ferromagnetic quantum critical point. On the other hand, the
static uniform susceptibility $\chi_s$ is observed to diverge as $T^{-2/3}$ and
$1/T_1T\propto \chi_s^2$, a behaviour which is not accounted for by SCR theory.
The application of a magnetic field $H$ is observed to induce a crossover to a
Fermi liquid behaviour and for $T\to 0$ $1/T_1$ is found to obey the scaling
law $1/T_1(H)= 1/T_1(0)[1+(\mu_BH/k_BT)^2]^{-1}$.


title: An MAS-Based ETL Approach for Complex Data

abstract:
  In a data warehousing process, the phase of data integration is crucial. Many
methods for data integration have been published in the literature. However,
with the development of the Internet, the availability of various types of data
(images, texts, sounds, videos, databases...) has increased, and structuring
such data is a difficult task. We name these data, which may be structured or
unstructured, "complex data". In this paper, we propose a new approach for
complex data integration, based on a Multi-Agent System (MAS), in association
to a data warehousing approach. Our objective is to take advantage of the MAS
to perform the integration phase for complex data. We indeed consider the
different tasks of the data integration process as services offered by agents.
To validate this approach, we have actually developed an MAS for complex data
integration.


title: Frequent itemsets mining for database auto-administration

abstract:
  With the wide development of databases in general and data warehouses in
particular, it is important to reduce the tasks that a database administrator
must perform manually. The aim of auto-administrative systems is to
administrate and adapt themselves automatically without loss (or even with a
gain) in performance. The idea of using data mining techniques to extract
useful knowledge for administration from the data themselves has existed for
some years. However, little research has been achieved. This idea nevertheless
remains a very promising approach, notably in the field of data warehousing,
where queries are very heterogeneous and cannot be interpreted easily. The aim
of this study is to search for a way of extracting useful knowledge from stored
data themselves to automatically apply performance optimization techniques, and
more particularly indexing techniques. We have designed a tool that extracts
frequent itemsets from a given workload to compute an index configuration that
helps optimizing data access time. The experiments we performed showed that the
index configurations generated by our tool allowed performance gains of 15% to
25% on a test database and a test data warehouse.


title: A Complex Data Warehouse for Personalized, Anticipative Medicine

abstract:
  With the growing use of new technologies, healthcare is nowadays undergoing
significant changes. Information-based medicine has to exploit medical
decision-support systems and requires the analysis of various, heterogeneous
data, such as patient records, medical images, biological analysis results,
etc. In this paper, we present the design of the complex data warehouse
relating to high-level athletes. It is original in two ways. First, it is aimed
at storing complex medical data. Second, it is designed to allow innovative and
quite different kinds of analyses to support: (1) personalized and anticipative
medicine (in opposition to curative medicine) for well-identified patients; (2)
broad-band statistical studies over a given population of patients.
Furthermore, the system includes data relating to several medical fields. It is
also designed to be evolutionary to take into account future advances in
medical research.


title:
Half-filled Hubbard Model on a Bethe lattice with next-nearest neighbor
  hopping

abstract:
  We study the interplay between N\'eel-antiferromagnetism and the paramagnetic
metal-insulator-transition (PMIT) on a Bethe lattice with nearest and
next-nearest eighbor hopping $t_1$ and $t_2$. We concentrate in this paper on
the situation at half-filling. For $t_2/t_1\to 1$ the PMIT outgrows the
antiferromagnetic phase and shows a scenario similar to V$_2$O$_3$. In this
parameter regime we also observe a novel magnetic phase.


title:
Liquid phase production of graphene by exfoliation of graphite in
  surfactant/water solutions

abstract:
  We have demonstrated a method to disperse and exfoliate graphite to give
graphene suspended in water-surfactant solutions. Optical characterisation of
these suspensions allowed the partial optimisation of the dispersion process.
Transmission electron microscopy showed the dispersed phase to consist of small
graphitic flakes. More than 40% of these flakes had <5 layers with ~3% of
flakes consisting of monolayers. These flakes are stabilised against
reaggregation by Coulomb repulsion due to the adsorbed surfactant. However, the
larger flakes tend to sediment out over ~6 weeks, leaving only small flakes
dispersed. It is possible to form thin films by vacuum filtration of these
dispersions. Raman and IR spectroscopic analysis of these films suggests the
flakes to be largely free of defects and oxides. The deposited films are
reasonably conductive and are semi-transparent. Further improvements may result
in the development of cheap transparent conductors.


title: Expressing OLAP operators with the TAX XML algebra

abstract:
  With the rise of XML as a standard for representing business data, XML data
warehouses appear as suitable solutions for Web-based decision-support
applications. In this context, it is necessary to allow OLAP analyses over XML
data cubes (XOLAP). Thus, XQuery extensions are needed. To help define a formal
framework and allow much-needed performance optimizations on analytical queries
expressed in XQuery, having an algebra at one's disposal is desirable. However,
XOLAP approaches and algebras from the literature still largely rely on the
relational model and/or only feature a small number of OLAP operators. In
opposition, we propose in this paper to express a broad set of OLAP operators
with the TAX XML algebra.


title:
Proper motions with Subaru I. Methods and a first sample in the Subaru
  Deep Field

abstract:
  We search for stars with proper motions in a set of twenty deep Subaru
images, covering about 0.28 square degrees to a depth of i ~ 25, taken over a
span of six years. In this paper, we describe in detail our reduction and
techniques to identify moving objects. We present a first sample of 99 stars
with motions of high significance, and discuss briefly the populations from
which they are likely drawn. Based on photometry and motions alone, we expect
that 9 of the candidates may be white dwarfs. We also find a group of stars
which may be extremely metal-poor subdwarfs in the halo.