title: On David type Siegel Disks of the Sine family

abstract:
  In 2008 Petersen posed a list of questions on the application of
trans-quasiconformal Siegel surgery developed by Zakeri and himself. In this
paper we extend Petersen-Zakeri's idea so that the surgery can be applied to
all the premodels which have no "free critical points". We explain how the idea
is used in solving three of the questions posed by Petersen. To present the
details of the idea, we focus on the solution of one of them: we prove that for
typical rotation numbers $0< \theta < 1$, the boundary of the Siegel disk of
$f_{\theta}(z) = e^{2 \pi i \theta} \sin (z)$ is a Jordan curve which passes
through exactly two critical points $\pi/2$ and $-\pi/2$.


title: R-parity preserving super-WIMP decays

abstract:
  We point out that when the decay of one electroweak scale super-WIMP state to
another occurs at second order in a super-weak coupling constant, this can
naturally lead to decay lifetimes that are much larger than the age of the
Universe, and create observable consequences for the indirect detection of dark
matter. We demonstrate this in a supersymmetric model with Dirac neutrinos,
where the right-handed scalar neutrinos are the lightest and next-to-lightest
supersymmetric partners. We show that this model produces a super-WIMP decay
rate scaling as m_nu^4/(weak scale)^3, and may significantly enhance the
fraction of energetic electrons and positrons over anti-protons in the decay
products. Such a signature is consistent with the observations recently
reported by the PAMELA experiment.


title: Mixed volume and an extension of intersection theory of divisors

abstract:
  Let K(X) be the collection of all non-zero finite dimensional subspaces of
rational functions on an n-dimensional irreducible variety X. For any n-tuple
L_1,..., L_n in K(X), we define an intersection index [L_1,..., L_n] as the
number of solutions in X of a system of equations f_1 = ... = f_n = 0 where
each f_i is a generic function from the space L_i. In counting the solutions,
we neglect the solutions x at which all the functions in some space L_i vanish
as well as the solutions at which at least one function from some subspace L_i
has a pole. The collection K(X) is a commutative semigroup with respect to a
natural multiplication. The intersection index [L_1,..., L_n] can be extended
to the Grothendieck group of K(X). This gives an extension of the intersection
theory of divisors. The extended theory is applicable even to non-complete
varieties. We show that this intersection index enjoys all the main properties
of the mixed volume of convex bodies. Our paper is inspired by the
Bernstein-Kushnirenko theorem from the Newton polytope theory.


title: A Unified Quantum NOT Gate

abstract:
  We study the feasibility of implementing a quantum NOT gate (approximate)
when the quantum state lies between two latitudes on the Bloch's sphere and
present an analytical formula for the optimized 1-to-$M$ quantum NOT gate. Our
result generalizes previous results concerning quantum NOT gate for a quantum
state distributed uniformly on the whole Bloch sphere as well as the phase
covariant quantum state. We have also shown that such 1-to-$M$ optimized NOT
gate can be implemented using a sequential generation scheme via matrix product
states (MPS).


title: An algorithmic Littlewood-Richardson rule

abstract:
  We introduce a Littlewood-Richardson rule based on an algorithmic deformation
of skew Young diagrams and present a bijection with the classical rule. The
result is a direct combinatorial interpretation and proof of the geometric rule
presented by Coskun. We also present a corollary regarding the Specht modules
of the intermediate diagrams.


title:
Comparing Trimaximal Mixing and Its Variants with Deviations from
  Tri-bimaximal Mixing

abstract:
  We analyze in detail the predictions of "trimaximal" neutrino mixing, which
is defined by a mixing matrix with identical second column elements. This
column is therefore identical to the second column in the case of tri-bimaximal
mixing. We also generalize trimaximal mixing by assuming that the other rows
and columns of the mixing matrix individually have the same forms as for
tri-bimaximal mixing. The phenomenology of these new mixing scenarios is
studied. We emphasize how trimaximal mixings can be distinguished
experimentally from broken tri-bimaximal mixing.


title:
Hamiltonization of Nonholonomic Systems and the Inverse Problem of the
  Calculus of Variations

abstract:
  We introduce a method which allows one to recover the equations of motion of
a class of nonholonomic systems by finding instead an unconstrained Hamiltonian
system on the full phase space, and to restrict the resulting canonical
equations to an appropriate submanifold of phase space. We focus first on the
Lagrangian picture of the method and deduce the corresponding Hamiltonian from
the Legendre transformation. We illustrate the method with several examples and
we discuss its relationship to the Pontryagin maximum principle.


title: An Introduction to Knowledge Management

abstract:
  Knowledge has been lately recognized as one of the most important assets of
organizations. Managing knowledge has grown to be imperative for the success of
a company. This paper presents an overview of Knowledge Management and various
aspects of secure knowledge management. A case study of knowledge management
activities at Tata Steel is also discussed


title: Persistent Current in Metallic Rings and Cylinders

abstract:
  We explore the behavior of persistent current and low-field magnetic response
in mesoscopic one-channel rings and multi-channel cylinders within the
tight-binding framework. We show that the characteristic properties of
persistent current strongly depend on total number of electrons $N_e$, chemical
potential $\mu$, randomness and total number of channels. The study of
low-field magnetic response reveals that only for one-channel rings with fixed
$N_e$, sign of the low-field currents can be predicted exactly, even in the
presence of disorder. On the other hand, for multi-channel cylinders, sign of
the low-field currents cannot be mentioned exactly, even in the perfect systems
with fixed $N_e$ as it significantly depends on the choices of $N_e$, $\mu$,
number of channels, disordered configurations, etc.


title: Indecomposable Permutations, Hypermaps and Labeled Dyck Paths

abstract:
  Hypermaps were introduced as an algebraic tool for the representation of
embeddings of graphs on an orientable surface. Recently a bijection was given
between hypermaps and indecomposable permutations; this sheds new light on the
subject by connecting a hypermap to a simpler object. In this paper, a
bijection between indecomposable permutations and labelled Dyck paths is
proposed, from which a few enumerative results concerning hypermaps and maps
follow. We obtain for instance an inductive formula for the number of hypermaps
with n darts, p vertices and q hyper-edges; the latter is also the number of
indecomposable permutations of with p cycles and q left-to-right maxima. The
distribution of these parameters among all permutations is also considered.


title:
Critical dynamics of nonconserved $N$-vector model with anisotropic
  nonequilibrium perturbations

abstract:
  We study dynamic field theories for nonconserving $N$-vector models that are
subject to spatial-anisotropic bias perturbations. We first investigate the
conditions under which these field theories can have a single length scale.
When N=2 or $N \ge 4$, it turns out that there are no such field theories, and,
hence, the corresponding models are pushed by the bias into the Ising class. We
further construct nontrivial field theories for N=3 case with certain bias
perturbations and analyze the renormalization-group flow equations. We find
that the three-component systems can exhibit rich critical behavior belonging
to two different universality classes.


title:
Role of multiple subband renormalization in the electronic transport of
  correlated oxide superlattices

abstract:
  Metallic behavior of band-insulator/ Mott-insulator interfaces was observed
in artificial perovskite superlattices such as in nanoscale SrTiO3/LaTiO3
multilayers. Applying a semiclassical perspective to the parallel electronic
transport we identify two major ingredients relevant for such systems: i) the
quantum confinement of the conduction electrons (superlattice modulation) leads
to a complex, quasi-two dimensional subband structure with both hole- and
electron-like Fermi surfaces. ii) strong electron-electron interaction requires
a substantial renormalization of the quasi-particle dispersion. We characterize
this renormalization by two sets of parameters, namely, the quasi-particle
weight and the induced particle-hole asymmetry of each partially filled
subband. In our study, the quasi-particle dispersion is calculated
self-consistently as function of microscopic parameters using the slave-boson
mean-field approximation introduced by Kotliar and Ruckenstein. We discuss the
consequences of strong local correlations on the normal-state free-carrier
response in the optical conductivity and on the thermoelectric effects.


title: Annealed upper tails for the energy of a polymer

abstract:
  We study the upper tails for the energy of a randomly charged symmetric and
transient random walk. We assume that only charges on the same site interact
pairwise. We consider annealed estimates, that is when we average over both
randomness, in dimension three or more. We obtain a large deviation principle,
and an explicit rate function for a large class of charge distributions.


title:
Universally catenarian integral domains, strong S-domains and semistar
  operations

abstract:
  Let $D$ be an integral domain and $\star$ a semistar operation stable and of
finite type on it. In this paper, we are concerned with the study of the
semistar (Krull) dimension theory of polynomial rings over $D$. We introduce
and investigate the notions of $\star$-universally catenarian and
$\star$-stably strong S-domains and prove that, every $\star$-locally finite
dimensional Pr\"{u}fer $\star$-multiplication domain is $\star$-universally
catenarian, and this implies $\star$-stably strong S-domain. We also give new
characterizations of $\star$-quasi-Pr\"{u}fer domains introduced recently by
Chang and Fontana, in terms of these notions.


title:
Gravitational instability of simply rotating AdS black holes in higher
  dimensions

abstract:
  We study the stability of AdS black hole holes rotating in a single two plane
for tensor-type gravitational perturbations in $D > 6$ space-time dimensions.
First, by an analytic method, we show that there exists no unstable mode when
the magnitude $a$ of the angular momentum is smaller than $r_h^2/R$ where $r_h$
is the horizon radius, and $R$ is the AdS curvature radius. Then, by numerical
calculations of quasinormal modes, using the separability of the relevant
perturbation equations, we show that an instability occurs for rapidly rotating
black holes with $a>r_h^2/R$, although the growth rate is tiny (of order
$10^{-12}$ of the inverse horizon radius). We give numerical evidences
indicating that this instability is caused by superradiance.


title:
The short-time self-diffusion coefficient of a sphere in a suspension of
  rigid rods

abstract:
  The short--time self diffusion coefficient of a sphere in a suspension of
rigid rods is calculated in first order in the rod volume fraction. For low rod
concentrations the correction to the Einstein diffusion constant of the sphere
is a linear function of the rod volume fraction with the slope proportional to
the equilibrium averaged mobility diminution trace of the sphere interacting
with a single freely translating and rotating rod. The two--body hydrodynamic
interactions are calculated using the so--called bead model in which the rod is
replaced by a stiff linear chain of touching spheres. The interactions between
spheres are calculated numerically using the multipole method. Also an
analytical expression for the diffusion coefficient as a function of the rod
aspect ratio is derived in the limit of very long rods. We show that in this
limit the correction to the Einstein diffusion constant does not depend on the
size of the tracer sphere. The higher order corrections depending on the
applied model are computed numerically. An approximate expression is provided,
valid for a wide range of aspect ratios.


title: A bijectional attack on the Razumov-Stroganov conjecture

abstract:
  We attempt to prove the Razumov-Stroganov conjecture using a bijectional
approach. We have been unsuccessful but we believe the techniques we present
can be used to prove the conjecture.


title: Applications of the Jacobi group to Quantum Mechanics

abstract:
  Infinitesimal holomorphic realizations for the Schr\"{o}dinger-Weil
representation and the discrete series representations of the Jacobi group are
constructed. Explicit expressions of the basic differential operators are
obtained. The squeezed states for the unitary irreducible representation of the
Jacobi group are introduced. Matrix elements of the squeezed operators,
expectation values of polynomial operators in infinitesimal generators of the
Jacobi group, the squeezing region and a description of Mandel's parameter are
presented.

categories: math.DG math-ph math.MP math.RT physics.optics


title:
Locally adaptive estimation methods with application to univariate time
  series

abstract:
  The paper offers a unified approach to the study of three locally adaptive
estimation methods in the context of univariate time series from both
theoretical and empirical points of view. A general procedure for the
computation of critical values is given. The underlying model encompasses all
distributions from the exponential family providing for great flexibility. The
procedures are applied to simulated and real financial data distributed
according to the Gaussian, volatility, Poisson, exponential and Bernoulli
models. Numerical results exhibit a very reasonable performance of the methods.


title:
Powerful H$_2$ Emission and Star Formation on the Interacting Galaxy
  System Arp 143: Observations with Spitzer and GALEX

abstract:
  We present new mid-infrared ($5 - 35\mu$m) and ultraviolet (1539 -- 2316 \AA)
observations of the interacting galaxy system Arp 143 (NGC 2444/2445) from the
Spitzer Space Telescope and GALEX. In this system, the central nucleus of NGC
2445 is surrounded by knots of massive star-formation in a ring-like structure.
We find unusually strong emission from warm H$_2$ associated with an expanding
shock wave between the nucleus and the western knots. At this ridge, the flux
ratio between H$_2$ and PAH emission is nearly ten times higher than in the
nucleus. Arp 143 is one of the most extreme cases known in that regard. From
our multi-wavelength data we derive a narrow age range of the star-forming
knots between 2 Myr and 7.5 Myr, suggesting that the ring of knots was formed
almost simultaneously in response to the shock wave traced by the H$_2$
emission. However, the knots can be further subdivided in two age groups: those
with an age of 2--4 Myr (knots A, C, E, and F), which are associated with
$8\mu$m emission from PAHs, and those with an age of 7-8 Myr (knots D and G),
which show little or no $8\mu$m emission shells surrounding them. We attribute
this finding to an ageing effect of the massive clusters which, after about 6
Myr, no longer excite the PAHs surrounding the knots.


title: Nuclear emulsions in the OPERA experiment

abstract:
  The use of emulsions as particles detector has a long and successful life.
The recent development of fast automatized analysis systems has allowed the use
of huge amount of emulsions films with no precedence in the history of particle
physics. The OPERA experiment, running in the underground Laboratori Nazionali
del Gran Sasso (LNGS), for the confirmation of the neutrino oscillation in the
$\nu_{\mu}\to\nu_{tau}$ channel, is "the major" of these experiments. The
experimental technique, the strategy and the first results of the experiment
are presented.


title:
InP-quantum dots in Al0.20Ga0.80InP with different barrier
  configurations

abstract:
  Systematic ensemble photoluminescence studies have been performed on type-I
InP-quantum dots in Al0.20Ga0.80InP barriers, emitting at approximately 1.85 eV
at 5 K. The influence of different barrier configurations as well as the
incorporation of additional tunnel barriers on the optical properties has been
investigated. The confinement energy between the dot barrier and the
surrounding barrier layers, which is the sum of the band discontinuities for
the valence and the conduction bands, was chosen to be approximately 190 meV by
using Al0.50Ga0.50InP. In combination with 2 nm thick AlInP tunnel barriers,
the internal quantum efficiency of these barrier configurations can be
increased by up to a factor of 20 at elevated temperatures with respect to
quantum dots without such layers.


title: 2D Gravity on $AdS_2$ with Chern-Simons Corrections

abstract:
  We study 2D Maxwell-dilaton gravity with higher order corrections given by
the Chern-Simons term. The model admits three distinctive $AdS_2$ vacuum
solutions. By making use of the entropy function formalism we find the entropy
of the solutions which is corrected due to the presence of the Chern-Simons
term. We observe that the form of the correction depends not only on the
coefficient of the Chern-Simons term, but also on the sign of the electric
charge; pointing toward the chiral nature of the dual CFT. Using the asymptotic
symmetry of the theory as well as requiring a consistent picture we can find
the central charge and the level of U(1) current. Upon uplifting the solutions
to three dimensions we get purely geometric solutions which will be either
$AdS_3$ or warped $AdS_3$ with an identification.


title: A Scintillating Fiber Tracker With SiPM Readout

abstract:
  We present a prototype for the first tracking detector consisting of 250
micron thin scintillating fibers and silicon photomultiplier (SiPM) arrays. The
detector has a modular design, each module consists of a mechanical support
structure of 10mm Rohacell foam between two 100 micron thin carbon fiber skins.
Five layers of scintillating fibers are glued to both top and bottom of the
support structure. SiPM arrays with a channel pitch of 250 micron are placed in
front of the fibers. We show the results of the first module prototype using
multiclad fibers of types Bicron BCF-20 and Kuraray SCSF-81M that were read out
by novel 32-channel SiPM arrays from FBK-irst/INFN Perugia as well as
32-channel SiPM arrays produced by Hamamatsu. A spatial resolution of 88 micron
+/- 6 micron at an average yield of 10 detected photons per minimal ionizig
particle has been achieved.


title:
Independent magnetization behavior of a ferromagnetic
  metal/semiconductor hybrid system

abstract:
  We report the discovery of an effect where two ferromagnetic materials, one
semiconductor ((Ga,Mn)As) and one metal (permalloy), can be directly deposited
on each other and still switch their magnetization independently. We use this
independent magnetization behavior to create various resistance states
dependent on the magnetization direction of the individual layers. At zero
magnetic field a two layer device can reach up to four non-volatile resistance
states.


title: The existence of thick triangulations -- an "elementary" proof

abstract:
  We provide an alternative, simpler proof of the existence of thick
triangulations for noncompact $\mathcal{C}^1$ manifolds. Moreover, this proof
is simpler than the original one given in \cite{pe}, since it mainly uses tools
of elementary differential topology. The role played by curvatures in this
construction is also emphasized.


title:
Chandra Observations of Nuclear X-ray Emission from Low Surface
  Brightness Galaxies

abstract:
  We present Chandra detections of x-ray emission from the AGN in two giant Low
Surface Brightness (LSB) galaxies, UGC 2936 and UGC 1455. Their x-ray
luminosities are 1.8\times10^{42} ergs/s and 1.1\times10^{40} ergs/s
respectively. Of the two galaxies, UGC 2936 is radio loud. Together with
another LSB galaxy UGC 6614 (XMM archival data) both appear to lie above the
X-ray-Radio fundamental plane and their AGN have black hole masses that are low
compared to similar galaxies lying on the correlation. However, the bulges in
these galaxies are well developed and we detect diffuse x-ray emission from
four of the eight galaxies in our sample. Our results suggest that the bulges
of giant LSB galaxies evolve independently of their halo dominated disks which
are low in star formation and disk dynamics. The centers follow an evolutionary
path similar to that of bulge dominated normal galaxies on the Hubble Sequence
but the LSB disks remain unevolved. Thus the bulge and disk evolution are
decoupled and so whatever star formation processes produced the bulges did not
affect the disks.


title:
Multiple Quantum Oscillations in the de Haas van Alphen Spectra of the
  Underdoped High Temperature Superconductor YBa_2Cu_3O_6.5

abstract:
  By improving the experimental conditions and extensive data accumulation, we
have achieved very high-precision in the measurements of the de Haas-van Alphen
effect in the underdoped high-temperature superconductor
YBa$_{2}$Cu$_{3}$O$_{6.5}$. We find that the main oscillation, so far believed
to be single-frequency, is composed of three closely spaced frequencies. We
attribute this to bilayer splitting and warping of a single quasi-2D Fermi
surface, indicating that \emph{c}-axis coherence is restored at low temperature
in underdoped cuprates. Our results do not support the existence of a larger
frequency of the order of 1650 T reported recently in the same compound [S.E.
Sebastian {\it et al}., Nature {\bf 454}, 200 (2008)].


title: A Non-Demolition Single Spin Meter

abstract:
  We present the theory of a single spin meter consisting of a quantum dot in a
magnetic field under microwave irradiation combined with a charge counter. We
show that when a current is passed through the dot, a change in the average
occupation number occurs if the microwaves are resonant with the on-dot Zeeman
splitting. The width of the resonant change is given by the microwave induced
Rabi frequency, making the quantum dot a sensitive probe of the local magnetic
field and enabling the detection of the state of a nearby spin. If the dot-spin
and the nearby spin have different g-factors a non-demolition readout of the
spin state can be achieved. The conditions for a reliable spin readout are
found.


title: Synchronization of extended systems from internal coherence

abstract:
  A condition for the synchronizability of a pair of PDE systems, coupled
through a finite set of variables, is commonly the existence of internal
synchronization or internal coherence in each system separately. The condition
was previously illustrated in a forced-dissipative system, and is here extended
to Hamiltonian systems, using an example from particle physics. Full
synchronization is precluded by Liouville's theorem. A form of synchronization
weaker than "measure synchronization" is manifest as the positional coincidence
of coherent oscillations ("breathers" or "oscillons") in a pair of coupled
scalar field models in an expanding universe with a nonlinear potential, and
does not occur with a variant of the model that does not exhibit oscillons.


title: Optimal distribution of measurement time in single channel measurements

abstract:
  Single channel measurements play a minor role in today physics, but they are
sometimes unavoidable. Comparing to multichannel measurements, there is
distribution of measurement time to be chosen in an experiment design. A method
to optimize distribution of measurement time is given, where optimal
distribution minimizes standard deviation of a selected fit parameter. As an
example, the method is applied to electron spectroscopy experiments.


title: Miyaoka-Yau inequality for minimal projective manifolds of general type

abstract:
  In this short note, we prove the Miyaoka-Yau inequality for minimal
projective $n$-manifolds of general type by using K\"ahler-Ricci flow.


title: Restricted involutions and Motzkin paths

abstract:
  We show how a bijection due to Biane between involutions and labelled Motzkin
paths yields bijections between Motzkin paths and two families of restricted
involutions that are counted by Motzkin numbers, namely, involutions avoiding
4321 and 3412. As a consequence, we derive characterizations of Motzkin paths
corresponding to involutions avoiding either 4321 or 3412 together with any
pattern of length 3. Furthermore, we exploit the described bijection to study
some notable subsets of the set of restricted involutions, namely, fixed point
free and centrosymmetric restricted involutions.


title: Batalin-Vilkovisky Integrals in Finite Dimensions

abstract:
  The Batalin-Vilkovisky method (BV) is the most powerful method to analyze
functional integrals with (infinite-dimensional) gauge symmetries presently
known. It has been invented to fix gauges associated with symmetries that do
not close off-shell. Homological Perturbation Theory is introduced and used to
develop the integration theory behind BV and to describe the BV quantization of
a Lagrangian system with symmetries. Localization (illustrated in terms of
Duistermaat-Heckman localization) as well as anomalous symmetries are discussed
in the framework of BV.


title: On the existence of a static black hole on a brane

abstract:
  We study a static black hole localized on a brane in the Randall-Sundrum (RS)
II braneworld scenario. To solve this problem numerically, we develop a code
having the almost 4th-order accuracy. This code derives the highly accurate
result for the case where the brane tension is zero, i.e., the spherically
symmetric case. However, a nonsystematic error is detected in the cases where
the brane tension is nonzero. This error is irremovable by any systematic
methods such as increasing the resolution, setting the outer boundary at more
distant location, or improving the convergence of the numerical relaxation. We
discuss the possible origins for the nonsystematic error, and conclude that our
result is naturally interpreted as the evidence for the nonexistence of
solutions to this setup, although an "approximate" solution exists for
sufficiently small brane tension. We discuss the possibility that the black
holes produced on a brane may be unstable and lead to two interesting
consequences: the event horizon pinch and the brane pinch.


title:
Time parameters and Lorentz transformations of relativistic stochastic
  processes

abstract:
  Rules for the transformation of time parameters in relativistic Langevin
equations are derived and discussed. In particular, it is shown that, if a
coordinate-time parameterized process approaches the relativistic
Juttner-Maxwell distribution, the associated proper-time parameterized process
converges to a modified momentum distribution, differing by a factor
proportional to the inverse energy.


title:
Fractional periodic persistent current in a twisted normal metal loop:
  an exact result

abstract:
  We explore a novel mechanism for control of periodicity in persistent current
in a twisted normal metal loop threaded by a magnetic flux $\phi$. A simple
tight-binding model is used to describe the system. Quite interestingly we see
that, depending on the number of twist $p$, the persistent current exhibits
$\phi_0/p$ ($\phi_0=ch/e$, the elementary flux-quantum) periodicity. Such
fractional periodicity provides a new finding in the study of persistent
current.


title:
On Dispersive Decay for Discrete 3D Schr\"odinger and Klein-Gordon
  Equations

abstract:
  We derive the long-time decay in weighted norms for solutions of the discrete
3D Schr\"odinger and Klein-Gordon equations.


title:
Two-photon exchange and polarization physics in electron-proton
  scattering

abstract:
  We discuss effects of two-photon exchange (TPE) in various observables of the
elastic ep-scattering. The imaginary part of the TPE amplitude manifests in
target and beam normal spin asymmetries. The real part contributes to the
cross-section. A model-independent phenomenological analysis of experimental
data is performed. Its results are compared with theoretical calculations.


title: Electroweak Physics Measurements at the LHC

abstract:
  Although often quoted as a discovery collider, the LHC will also allow for
precise measurements. In particular, in the electroweak sector, the
determination of the masses of the top quark and the W boson will benefit from
high statistics and new methods.


title: V^0 production in p+A collisions at \sqrt{s} = 41.6 GeV

abstract:
  Inclusive doubly differential cross sections d^2\sigma_{pA}/dx_Fdp_T^2 as a
function of Feynman-x (x_F) and transverse momentum (p_T) for the production of
K^0_s, Lambda^0 and anti-Lambda^0 in proton-nucleus interactions at 920 GeV are
presented. The measurements were performed by HERA-B in the negative x_F range
(-0.12<x_F<0.0) and for transverse momenta up to p_T= 1.6 GeV/c. Results for
three target materials: carbon, titanium and tungsten are given. The ratios of
production cross sections are presented and discussed. The Cronin effect is
clearly observed for all three V^0 species. The atomic number dependence is
parameterized as \sigma_{pA} = \sigma_{pN} \cdot A^\alpha where \sigma_{pN} is
the proton-nucleon cross section. The measured values of \alpha are all near
one. The results are compared with EPOS 1.67 and PYTHIA 6.3. EPOS reproduces
the data to within \approx 20% except at very low transverse momentum.


title:
Ferromagnetism in the Extended Periodic Anderson Model Near Selective
  Mott Localization

abstract:
  Motivated by the experimental finding of Ferromagnetism (FM) near non-FL
quantum phase transitions (QPT), I investigate FM in an Extended Periodic
Anderson Model (EPAM). Using the Frobenius-Perron theorem, a FM {\it metallic}
phase near the selective Mott localization is rigorously found. Interesting
connections with Tasaki's flat-band ferromagnetism, as well as with the
well-known double exchange (DE) mechanism are elucidated. This finding is a
higher dimensional generalization of numerical work on the D=1 PAM, and
constitutes a robust way to FM metallic behavior in $D>1$. Finally, we discuss
a concrete manifestation of our results to $UGe_{2}$.


title: AGN's UV and X-ray luminosities in clumpy accretion flows

abstract:
  We consider the fuelling of the central massive black hole in Active Galactic
Nuclei, through an inhomogeneous accretion flow. Performing simple analytical
treatments, we show that shocks between elements (clumps) forming the accretion
flow may account for the UV and X-ray emission in AGNs. In this picture, a
cascade of shocks is expected, where optically thick shocks give rise to
optical/UV emission, while optically thin shocks give rise to X-ray emission.
The resulting blue bump temperature is found to be quite similar in different
AGNs. We obtain that the ratio of X-ray luminosity to UV luminosity is smaller
than unity, and that this ratio is smaller in massive objects compared to less
massive sources. This is in agreement with the observed $L_{X}/L_{UV}$ ratio
and suggests a possible interpretation of the $\alpha_{OX}-l_{UV}$
anticorrelation.


title: Lh_c

abstract:
  The production cross-section of h_c, the 1P_1 charmonium state, can be
predicted in Non-Relativistic QCD (NRQCD) using heavy-quark symmetry. We show
that at the Large Hadron Collider a large cross-section for this resonance is
predicted and it should be possible to look for the h_c through it decay into
J/psi +pi even with the statistics that will be achieved within a few months of
run-time at the LHC.


title:
Photon creation from vacuum and interactions engineering in
  nonstationary circuit QED

abstract:
  We study theoretically the nonstationary circuit QED system in which the
artificial atom transition frequency, or the atom-cavity coupling, have a small
periodic time modulation, prescribed externally. The system formed by the atom
coupled to a single cavity mode is described by the Rabi Hamiltonian. We show
that, in the dispersive regime, when the modulation periodicity is tuned to the
`resonances', the system dynamics presents the dynamical Casimir effect,
resonant Jaynes-Cummings or resonant Anti-Jaynes-Cummings behaviors, and it can
be described by the corresponding effective Hamiltonians. In the resonant
atom-cavity regime and under the resonant modulation, the dynamics is similar
to the one occurring for a stationary two-level atom in a vibrating cavity, and
an entangled state with two photons can be created from vacuum. Moreover, we
consider the situation in which the atom-cavity coupling, the atomic frequency,
or both have a small nonperiodic time modulation, and show that photons can be
created from vacuum in the dispersive regime. Therefore, an analog of the
dynamical Casimir effect can be simulated in circuit QED, and several photons,
as well as entangled states, can be generated from vacuum due to the
anti-rotating term in the Rabi Hamiltonian.


title: On approximations by shifts of the Gaussian function

abstract:
  The paper study the discrete sets of translations of the Gaussian function
that span the spaces L1(R) and L2(R).


title: Brightness, distribution, and evolution of sunspot umbral dots

abstract:
  We present a 106-minute TiO (705.7nm) time series of high spatial and
temporal resolution that contains thousands of umbral dots (UDs) in a mature
sunspot in the active region NOAA 10667 at $\mu$=0.95. The data were acquired
with the 1-m Swedish Solar Telescope on La Palma. With the help of a multilevel
tracking (MLT) algorithm the sizes, brightnesses, and trajectories of 12836
umbral dots were found and analyzed. The MLT allows UDs with very low contrast
to be reliably identified. Inside the umbra we determine a UD filling factor of
11%. The histogram of UD lifetimes is monotonic, i.e. a UD does not have a
typical lifetime. Three quarters of the UDs lived for less than 150s and showed
no or little motion. The histogram of the UD diameters exhibits a maximum at
225km, i.e. most of the UDs are spatially resolved. UDs display a typical
horizontal velocity of 420m/s and a typical peak intensity of 51% of the mean
intensity of the quiet photosphere, making them on average 20% brighter than
the local umbral background. Almost all mobile UDs (large birth-death distance)
were born close to the umbra-penumbra boundary, move towards the umbral center,
and are brighter than average. Notably bright and mobile UDs were also observed
along a prominent UD chain, both ends of which are located at the
umbra-penumbra boundary. Their motion started primarily at either of the ends
of the chain, continued along the chain, and ended near the chain's center. We
observed the splitting and merging of UDs and the temporal succession of both.
For the first time the evolution of brightness, size, and horizontal speed of a
typical UD could be determined in a statistically significant way. Considerable
differences between the evolution of central and peripheral UDs are found,
which point to a difference in origin.


title: Searching for Radio Pulsars in 3EG Sources at Urumqi Observatory

abstract:
  Since mid-2005, a pulsar searching system has been operating at 18 cm on the
25-m radio telescope of Urumqi Observatory. Test observations on known pulsars
show that the system can perform the intended task. The prospect of using this
system to observe 3EG sources and other target searching tasks is discussed.


title:
Statistical Analysis of future Neutrino Mass Experiments including
  Neutrino-less Double Beta Decay

abstract:
  We perform a statistical analysis with the prospective results of future
experiments on neutrino-less double beta decay, direct searches for neutrino
mass (KATRIN) and cosmological observations. Realistic errors are used and the
nuclear matrix element uncertainty for neutrino-less double beta decay is also
taken into account. Three benchmark scenarios are introduced, corresponding to
quasi-degenerate, inverse hierarchical neutrinos, and an intermediate case. We
investigate to what extend these scenarios can be reconstructed. Furthermore,
we check the compatibility of the scenarios with the claimed evidence of
neutrino-less double beta decay.


title: Study of the tau^- -> K^- pi^+ pi^- nu_tau decay

abstract:
  We present a study of tau^- -> K^- pi^+ pi^- nu_tau decay using ~669 /fb
data, collected with the Belle detector at the KEKB asymmetric-energy e^+ e-
collider. The data is recorded at a center-of-mass energy 10.58 GeV. The result
for the branching ratio is : B = (3.25 +- 0.02(stat.) +0.16 -0.15(sys.))x10^-3
>. We also present results of the precise measurement of the branching ratio of
other 3-prong decay modes, tau^- -> pi^- pi^+ pi^- nu_tau, tau^- -> K^- K^+
pi^- nu_tau, and tau^- -> K^- K^+ K^- nu_tau .


title: Operations in Milnor K-theory

abstract:
  We show that operations in Milnor K-theory mod $p$ of a field are spanned by
divided power operations. After giving an explicit formula for divided power
operations and extending them to some new cases, we determine for all fields
$k$ and all prime numbers $p$, all the operations $K^M_i/p \to K^M_j/p$
commuting with field extensions over the base field $k$. Moreover, the integral
case is discussed and we determine the operations $K^M_i/p \to K^M_j/p$ for
smooth schemes over a field.


title: White Dwarf Spectra and Atmosphere Models

abstract:
  We describe the spectral classification of white dwarfs and some of the
physical processes important for their understanding. In the major part of this
paper we discuss the input physics and computational methods for one of the
most widely used stellar atmosphere codes for white dwarfs.


title:
Primordial production of massive relic gravitational waves from a weak
  modification of General Relativity

abstract:
  The production of a stochastic background of relic gravitational waves is
well known in various works in the literature, where, using the so called
adiabatically-amplified zero-point fluctuations process it has been shown how
the standard inflationary scenario for the early universe can in principle
provide a distinctive spectrum of relic gravitational waves. In this paper, it
is shown that a weak modification of General Relativity produces a third
massive polarization of gravitational waves and the primordial production of
this polarization is analysed adapting the adiabatically-amplified zero-point
fluctuations process at this case. The presence of the mass could also have
important applications in cosmology as the fact that gravitational waves can
have mass could give a contribution to the dark matter of the Universe. At the
end of the paper an upper bound for these relic gravitational waves, which
arises from the WMAP constrains, is also released.


title:
Phase transitions in multiferroic BiFeO3 crystals, thin-layers, and
  ceramics: Enduring potential for a single phase, room-temperature
  magnetoelectric 'holy grail'

abstract:
  Magnetic phase transitions in multiferroic bismuth ferrite (BiFeO3) induced
by magnetic field, epitaxial strain, and composition modification are
considered. These transitions from a spatially modulated spin spiral state to a
homogenous antiferromagnetic one are accompanied by the release of latent
magnetization and a linear magnetoelectric effect that makes BiFeO3-based
materials efficient room-temperature single phase multiferroics.


title:
Solitary Dust--Acoustic Waves in a Plasma with Two-Temperature Ions and
  Distributed Grain Size

abstract:
  The propagation of weakly nonlinear dust--acoustic waves in a dusty plasma
containing two ion species with different temperatures is explored. The
nonlinear equations describing both the quadratic and cubic plasma
nonlinearities are derived. It is shown that the properties of dust--acoustic
waves depend substantially on the grain size distribution. In particular, for
solitary dust--acoustic waves with a positive potential to exist in a plasma
with distributed grain size, it is necessary that the difference between the
temperatures of two ion species be large that that in the case of unusized
grains.


title: On the computational complexity of solving stochastic mean-payoff games

abstract:
  We consider some well-known families of two-player, zero-sum, perfect
information games that can be viewed as special cases of Shapley's stochastic
games. We show that the following tasks are polynomial time equivalent:
  - Solving simple stochastic games.
  - Solving stochastic mean-payoff games with rewards and probabilities given
in unary. - Solving stochastic mean-payoff games with rewards and probabilities
given in binary.


title: Ion-Acoustic Solitons in Bi-Ion Dusty Plasma

abstract:
  The propagation of ion-acoustic solitons in a warm dusty plasma containing
two ion species is investigated theoretically. Using an approach based on the
Korteveg-de-Vries equation, it is shown that the critical value of the negative
ion density that separates the domains of existence of compressi- on and
rarefaction solitons depends continuously on the dust density. A modified
Korteveg-de Vries equation for the critical density is derived in the higher
order of the expansion in the small parameter. It is found that the nonlinear
coefficient of this equation is positive for any values of the dust density and
the masses of positive and negative ions. For the case where the negative ion
density is close to its critical value, a soliton solution is found that takes
into account both the quadratic and cubic nonlinearities. The propagation of a
solitary wave of arbitrary amplitude is investigated by the quasi-potential
method. It is shown that the range of the dust densities around the critical
value within which solitary waves with positive and negative potentials can
exist simultaneously is relatively wide.


title: Matricially free random variables

abstract:
  We show that the operatorial framework developed by Voiculescu for free
random variables can be extended to arrays of random variables whose
multiplication imitates matricial multiplication. The associated notion of
independence, called matricial freeness, can be viewed as a generalization of
both freeness and monotone independence. At the same time, the sums of
matricially free random variables, called random pseudomatrices, are closely
related to Gaussian random matrices. The main results presented in this paper
concern the standard and tracial central limit theorems for random
pseudomatrices and the corresponding limit distributions which can be viewed as
matricial generalizations of semicirle laws.


title:
Building suitable sets for locally compact groups by means of continuous
  selections

abstract:
  If a discrete subset S of a topological group G with the identity 1 generates
a dense subgroup of G and S \cup {1} is closed in G, then S is called a
suitable set for G. We apply Michael's selection theorem to offer a direct,
self-contained, purely topological proof of the result of Hofmann and Morris on
the existence of suitable sets in locally compact groups. Our approach uses
only elementary facts from (topological) group theory.


title: Finite flat models of constant group schemes of rank two

abstract:
  We calculate the number of the isomorphism class of the finite flat models
over the ring of integers of an absolutely ramified $p$-adic field of constant
group schemes of rank two over finite fields, by counting the rational points
of a moduli space of finite flat models.


title: SDSS White Dwarf mass distribution at low effective temperatures

abstract:
  The DA white dwarfs in the Sloan Digital Sky Survey, as analyzed in the
papers for Data Releases 1 and 4, show an increase in surface gravity towards
lower effective temperatures below 11500 K. We study the various possible
explanations of this effect, from a real increase of the masses to
uncertainties or deficiencies of the atmospheric models. No definite answer is
found but the tentative conclusion is that it is most likely the current
description of convection in the framework of the mixing-length approximation,
which leads to this effect.


title: Trembling hand perfection is NP-hard

abstract:
  It is NP-hard to decide if a given pure-strategy Nash equilibrium of a given
three-player game in strategic form with integer payoffs is trembling hand
perfect.


title:
Dynamical formation and interaction of bright solitary waves and
  solitons in the collapse of Bose-Einstein condensates with attractive
  interactions

abstract:
  We model the dynamics of formation of multiple, long-lived, bright solitary
waves in the collapse of Bose-Einstein condensates with attractive interactions
as studied in the experiment of Cornish et al. [Phys. Rev. Lett. 96 (2006)
170401]. Using both mean-field and quantum field simulation techniques, we find
that while a number of separated wave packets form as observed in the
experiment, they do not have a repulsive \pi phase difference that has been
previously inferred. We observe that the inclusion of quantum fluctuations
causes soliton dynamics to be predominantly repulsive in one dimensional
simulations independent of their initial relative phase. However, indicative
three-dimensional simulations do not support this conclusion and in fact show
that quantum noise has a negative impact on bright solitary wave lifetimes.
Finally, we show that condensate oscillations, after the collapse, may serve to
deduce three-body recombination rates, and that the remnant atom number may
still exceed the critical number for collapse for as long as three seconds
independent of the relative phases of the bright solitary waves.


title:
On the blind source separation of human electroencephalogram by
  approximate joint diagonalization of second order statistics

abstract:
  Over the last ten years blind source separation (BSS) has become a prominent
processing tool in the study of human electroencephalography (EEG). Without
relying on head modeling BSS aims at estimating both the waveform and the scalp
spatial pattern of the intracranial dipolar current responsible of the observed
EEG. In this review we begin by placing the BSS linear instantaneous model of
EEG within the framework of brain volume conduction theory. We then review the
concept and current practice of BSS based on second-order statistics (SOS) and
on higher-order statistics (HOS), the latter better known as independent
component analysis (ICA). Using neurophysiological knowledge we consider the
fitness of SOS-based and HOS-based methods for the extraction of spontaneous
and induced EEG and their separation from extra-cranial artifacts. We then
illustrate a general BSS scheme operating in the time-frequency domain using
SOS only. The scheme readily extends to further data expansions in order to
capture experimental source of variations as well. A simple and efficient
implementation based on the approximate joint diagonalization of Fourier
cospectral matrices is described (AJDC). We conclude discussing useful aspects
of BSS analysis of EEG, including its assumptions and limitations.


title: On a conjecture on exponential Diophantine equations

abstract:
  We study the solutions of a Diophantine equation of the form $a^x+b^y=c^z$,
where $a\equiv 2 \pmod 4$, $b\equiv 3 \pmod 4$ and $\gcd (a,b,c)=1$. The main
result is that if there exists a solution $(x,y,z)=(2,2,r)$ with $r>1$ odd then
this is the only solution in integers greater than 1, with the possible
exception of finitely many values $(c,r)$. We also prove the uniqueness of such
a solution if any of $a$, $b$, $c$ is a prime power. In a different vein, we
obtain various inequalities that must be satisfied by the components of a
putative second solution.


title:
On near optimal trajectories for a game associated with the
  \infty-Laplacian

abstract:
  A two-player stochastic differential game representation has recently been
obtained for solutions of the equation -\Delta_\infty u=h in a \calC^2 domain
with Dirichlet boundary condition, where h is continuous and takes values in
\RR\setminus\{0\}. Under appropriate assumptions, including smoothness of u,
the vanishing \delta limit law of the state process, when both players play
\delta-optimally, is identified as a diffusion process with coefficients given
explicitly in terms of derivatives of the function u.


title:
Connecting anomaly and tunneling methods for Hawking effect through
  chirality

abstract:
  The role of chirality is discussed in unifying the anomaly and the tunneling
formalisms for deriving the Hawking effect. Using the chirality condition and
starting from the familiar form of the trace anomaly, the chiral
(gravitational) anomaly, manifested as a nonconservation of the stress tensor,
near the horizon of a black hole, is derived. Solution of this equation yields
the stress tensor whose asymptotic infinity limit gives the Hawking flux.
Finally, use of the same chirality condition in the tunneling formalism gives
the Hawking temperature that is compatible with the flux obtained by anomaly
method.


title: Statistics of trajectories in two-state master equations

abstract:
  We derive a simple expression for the probability of trajectories of a master
equation. The expression is particularly useful when the number of states is
small and permits the calculation of observables that can be defined as
functionals of whole trajectories. We illustrate the method with a two-state
master equation, for which we calculate the distribution of the time spent in
one state and the distribution of the number of transitions, each in a given
time interval. These two expressions are obtained analytically in terms of
modified Bessel functions.


title: Interferometry using spinor Bose-Einstein condensates

abstract:
  We study the time-evolution of an optically trapped spinor Bose-Einstein
condensate under the influence of a dominating magnetic bias field in the
z-direction, and a perpendicular smaller field that couples the spinor states.
We show that if the bias field depends quadratically on time, the relative
phases of the spinor components affect the populations of the final state. This
allows one to measure the differences in the time-evolution of the relative
phases, thereby realizing a multi-arm interferometer in a spinor Bose-Einstein
condensate.


title: Partons and jets in a strongly-coupled plasma from AdS/CFT

abstract:
  We give a pedagogical review of recent progress towards understanding the
response of a strongly coupled plasma at finite temperature to a hard probe.
The plasma is that of the N=4 supersymmetric Yang-Mills theory and the hard
probe is a virtual photon, or, more precisely, an R-current. Via the
gauge/gravity duality, the problem of the current interacting with the plasma
is mapped onto the gravitational interaction between a Maxwell field and a
black hole embedded in the AdS_5 x S^5 geometry. The physical interpretation of
the AdS/CFT results can be then reconstructed with the help of the
ultraviolet/infrared correspondence. We thus deduce that, for sufficiently high
energy, the photon (or any other hard probe: a quark, a gluon, or a meson)
disappears into the plasma via a universal mechanism, which is quasi-democratic
parton branching: the current develops a parton cascade such that, at any step
in the branching process, the energy is almost equally divided among the
daughter partons. The branching rate is controlled by the plasma which acts on
the colored partons with a constant force ~ T^2. When reinterpreted in the
plasma infinite momentum frame, the same AdS/CFT results suggest a parton
picture for the plasma structure functions, in which all the partons have
fallen at very small values of Bjorken's x. For a time-like current in the
vacuum, quasi-democratic branching implies that there should be no jets in
electron-positron annihilation at strong coupling, but only a spatially
isotropic distribution of hadronic matter.


title: Granular flow modelled by Brownian particles

abstract:
  Granular flows through pipes show interesting phenomena, e.g. clogging and
density waves, 1/f-noise. These things are fairly good studied by
computer-experiments, but there is a lack in theoretical and analytical
consideration. We introduce a simple "minimal" model describing such a flow of
granular particles and examine the stability of an initially homogeneous system
against perturbations. In order to define the collisions between the granular
particles we use two different approaches. For both, the simple and the more
advanced collision definition, the model shows the qualitative same behaviour.


title:
Coordination motifs and large-scale structural organization in atomic
  clusters

abstract:
  The structure of nanoclusters is complex to describe due to their
noncrystallinity, even though bonding and packing constraints limit the local
atomic arrangements to only a few types. A computational scheme is presented to
extract coordination motifs from sample atomic configurations. The method is
based on a clustering analysis of multipole moments for atoms in the first
coodination shell. Its power to capture large-scale structural properties is
demonstrated by scanning through the ground state of the Lennard-Jones and
C$_{60}$ clusters collected at the Cambridge Cluster Database.


title:
Radiative corrections to the lattice gluon action for highly improved
  staggered quarks (HISQ) and the effect of such corrections on the static
  potential

abstract:
  We perform a perturbative calculation of the influence of dynamical HISQ
fermions on the perturbative improvement of the gluonic action in the same way
as we have previously done for asqtad fermions. We find the fermionic
contributions to the radiative corrections in the Luescher-Weisz gauge action
to be somewhat larger for HISQ fermions than for asqtad. Using one-loop
perturbation theory as a test, we estimate that omission of the fermion-induced
radiative corrections in dynamical asqtad simulations will give a measurable
effect. The one-loop result gives a systematic shift of about -0.6% in (r_1/a)
on the coarsest asqtad improved staggered ensembles. This is the correct sign
and magnitude to explain the scaling violations seen in Phi_B on dynamical
lattice ensembles.


title: Three-body decays: structure, decay mechanism and fragment properties

abstract:
  We discuss the three-body decay mechanisms of many-body resonances. R-matrix
sequential description is compared with full Faddeev computation. The role of
the angular momentum and boson symmetries is also studied. As an illustration
we show the computed $\alpha$-particle energy distribution after the decay of
12C(1^+) resonance at 12.7 MeV.


title: Modeling the Local Warm/Hot Bubble

abstract:
  In this paper we review the modeling of the Local Bubble (LB) with special
emphasis on the progress we have made since the last major conference "The
Local Bubble and Beyond (I)" held in Garching in 1997. Since then new insight
was gained into the possible origin of the LB, with a moving group crossing its
volume during the last 10 - 15 Myr being most likely responsible for creating a
local cavity filled with hot recombining gas. Numerical high resolution 3D
simulations of a supernova driven inhomogeneous interstellar medium show that
we can reproduce both the extension of the LB and the OVI column density in
absorption measured with FUSE for a LB age of 13.5 - 14.5 Myr. We further
demonstrate that the LB evolves like an ordinary superbubble expanding into a
density stratified medium by comparing analytical 2D Kompaneets solutions to
NaI contours, representing the extension of the local cavity. These results
suggest that LB blow-out into the Milky Way halo has occurred roughly 5 Myr
ago.


title: Variable Intrinsic Absorption in Mrk 279

abstract:
  We examine the variability in the intrinsic absorption in the Seyfert 1
galaxy Mrk 279 using three epochs of observations from the Far Ultraviolet
Spectroscopic Explorer (FUSE) and two epochs of observations with the Space
Telescope Imaging Spectrograph on the Hubble Space Telescope. Rather than
finding simple photoionization responses of the absorbing gas to changes in the
underlying continuum, the observed changes in the absorption profiles can be
understood more clearly if the effective covering fraction of the gas in all
emission components, continuum and broad and intermediate velocity width
emission lines, is accounted for. While we do not uniquely solve for all of
these separate covering fractions and the ionic column densities using the
spectral data, we examine the parameter space using previously well-constrained
solutions for continuum and single emission component covering fractions.
Assuming full coverage of the continuum, we find that of the two velocity
components of the Mrk 279 absorption most likely associated with its outflow,
one likely has zero coverage of the intermediate line region while the other
does not. For each component, however, the broad line region is more fully
covered than the intermediate line region. Changes in the O VI column densities
are unconstrained due to saturation, but we show that small changes in the
nonsaturated C IV and N V column densities are consistent with the outflow gas
having zero or partial covering of the intermediate line region and an
ionization parameter changing from ~0.01 to ~0.1 from 2002 to 2003 as the UV
continuum flux increased by a factor of ~8. The absence of a change in the C
III absorbing column density is attributed to this species arising outside the
Mrk 279 outflow.


title: Conditional preparation of arbitrary atomic Dicke states

abstract:
  We propose an experimentally accessible procedure for conditional preparation
of highly non-classical states of collective spin of an atomic ensemble. The
quantum state engineering is based on a combination of QND interaction between
atoms and light previously prepared in a non-Gaussian state using photon
subtraction from squeezed vacuum beam, homodyne detection on the output light
beam, and a coherent displacement of atomic state. The procedure is capable of
non-deterministic preparation of a wide class of superpositions of atomic Dicke
states. We present several techniques to optimize the performance of the
protocol and maximize the trade-off between fidelity of prepared state and
success probability of the scheme.


title: Super-resolution without Evanescent Waves

abstract:
  The last decade has seen numerous efforts to achieve imaging resolution
beyond that of the Abbe-Rayleigh diffraction limit. The main direction of
research aiming to break this limit seeks to exploit the evanescent components
containing fine detail of the electromagnetic field distribution at the
immediate proximity of the object. Here we propose a solution that removes the
need for evanescent fields. The object being imaged or stimulated with
sub-wavelength accuracy does not need to be in the immediate proximity of the
superlens or field concentrator: an optical mask can be designed that creates
constructive interference of waves known as superoscillation, leading to a
sub-wavelength focus of prescribed size and shape in a `field of view' beyond
the evanescent fields, when illuminated by a monochromatic wave. Moreover, we
demonstrate that such a mask may be used not only as a focusing device, but
also as a super-resolution imaging device.


title: Saturation effects in experiments on the thermal Casimir effect

abstract:
  We address three different problematic Casimir experiments in this work. The
first is the classical Casimir force measured between two metal half spaces;
here in the form of the Casimir pressure measurement between a gold sphere and
a gold plate as performed by Decca et al. [Phys. Rev. D 75, 077101 (2007)];
theory predicts a large negative thermal correction, absent in the high
precision experiment. The second experiment is the measurement of the Casimir
force between a metal plate and a laser irradiated semiconductor membrane as
performed by Chen et al. [Phys. Rev. B 76, 035338 (2007)]; the change in force
with laser intensity is larger than predicted by theory. The third experiment
is the measurement of the Casimir force between an atom and a wall in the form
of the measurement by Obrecht et al. [Phys. Rev. Lett. 98 063201 (2007)] of the
change in oscillation frequency of a Rb Bose-Einstein condensate trapped to a
fused silica wall; the change is smaller than predicted by theory. We show that
saturation effects can explain the discrepancies between theory and experiment
observed in all these cases.


title:
Proceedings to the 11th Workshop 'What Comes Beyond the Standard
  Models', Bled, July 15 - 25, 2008, Slovenia

abstract:
  Contents: 1. Does the Dark Matter Consist of Baryons of New Heavy Stable
Family Predicted by the Approach Unifying Spins and Charges? (G. Bregar and
N.S. Mankoc Borstnik) 2. Lorentz Transformations for a Photon (V.V. Dvoeglazov)
3. Is the Space-Time Non-commutativity Simply Non-commutativity of Derivatives?
(V.V. Dvoeglazov) 4. Composite Dark Matter: Solving the Puzzles of Underground
Experiments? (M.Yu. Khlopov, A.G. Mayorov and E.Yu. Soldatov) 5. Spin
Connection Makes Massless Spinor Chirally Coupled to Kaluza-Klein Gauge Field
After Compactification of $M^{1+5}$ to $M^{1+3}$ x Infinite Disc Curved on
$S^2$ (D. Lukman, N.S. Mankoc Borstnik and H.B. Nielsen) 6. Some Obvious
Matters of Physics That Are Not Obvious (R. Mirman) 7. Discussions on the
Puzzles of the Dark Matter Search (Video Conference Participants) 8. Scattering
With Very Heavy Fermions (A. Kleppe) 9. Scientific-Educational Complex --
Virtual Institute of Astroparticle Physics (M.Yu. Khlopov)


title:
Flavor Changing Processes in Supersymmetric Models with Hybrid Gauge-
  and Gravity-Mediation

abstract:
  We consider supersymmetric models where gauge mediation provides the dominant
contributions to the soft supersymmetry breaking terms while gravity mediation
provides sub-dominant yet non-negligible contributions. We further assume that
the gravity-mediated contributions are subject to selection rules that follow
from a Froggatt-Nielsen symmetry. This class of models constitutes an example
of viable and natural non-minimally flavor violating models. The constraints
from mixing in the neutral K system imply that the modifications to the
Standard Model predictions for mixing in the neutral B_d and B_s systems are
generically at most at the percent level, but can be of order ten percent for
large $\tan \beta$. The modifications for the neutral D system mixing are
generically at most of order a few percent, but in a special subclass of models
they can be of order one. We point out $\Delta B=1$ processes relevant for
flavor violation in hybrid mediation.


title:
Hybridization of Spin and Plasma Waves in Josephson Tunnel Junctions
  Containing a Ferromagnetic Layer

abstract:
  We study dynamics of tunnel Josephson junctions with a thin ferromagnetic
layer F [superconductor-insulator-ferromagnet-superconductor (SIFS) junctions].
On the basis of derived equations relating the superconducting phase and
magnetic moment to each other we analyze collective excitations in the system
and find a new mode which is a hybrid of plasmalike and spin waves. The latter
are coupled together in a broad range of parameters characterizing the system.
Using the solution describing the collective modes we demonstrate that besides
the Fiske steps new peaks appear on the I-V characteristics due to oscillations
of the magnetic moment M in the ferromagnetic layer. Thus, by measuring the I-V
curve of the SIFS junctions, one can extract information about the spectrum of
spin excitations in the ferromagnet F.


title: Refining the Shifted Topological Vertex

abstract:
  We study aspects of the refining and shifting properties of the 3d MacMahon
function $\mathcal{C}_{3}(q) $ used in topological string theory and BKP
hierarchy. We derive the explicit expressions of the shifted topological vertex
$\mathcal{S}_{\lambda \mu \nu}(q) $ and its refined version
$\mathcal{T}_{\lambda \mu \nu}(q,t) $. These vertices complete results in
literature.


title:
Two types of conservation laws. Connection of physical fields with
  material systems. Peculiarities of field theories

abstract:
  Historically it happen so that in branches of physics connected with field
theory and of physics of material systems (continuous media) the concept of
"conservation laws" has a different meaning. In field theory "conservation
laws" are those that claim the existence of conservative physical quantities or
objects. These are conservation laws for physical fields. In contrast to that
in physics (and mechanics) of material systems the concept of "conservation
laws" relates to conservation laws for energy, linear momentum, angular
momentum, and mass that establish the balance between the change of physical
quantities and external action.
  In the paper presented it is proved that there exist a connection between of
conservation laws for physical fields and those for material systems. This
points to the fact that physical fields are connected with material systems.
Such results has an unique significance for field theories. This enables one to
substantiate many basic principles of field theories, such as, for example, the
unity of existing field theories and the causality. The specific feature of
field theory equations, namely, their connection to the equations for material
systems, is elicited. Such results have been obtained by using skew-symmetric
differential forms, which reflect the properties of conservation laws.


title:
A Relaying Incentive Scheme in Multihop Cellular Networks Based on
  Coalitional Game with Externalities

abstract:
  Cooperative multihop communication can greatly increase network throughput,
yet packet forwarding for other nodes involves opportunity and energy cost for
relays. Thus one of the pre-requisite problems in the successful implementation
of multihop transmission is how to foster cooperation among selfish nodes.
Existing researches mainly adopt monetary stimulating. In this manuscript, we
propose instead a simple and self-enforcing forwarding incentive scheme free of
indirect monetary remunerating for asymmetric (uplink multihop, downlink
single-hop) cellar network based on coalitional game theory, which comprises
double compensation, namely, Inter- BEA, global stimulating policy allotting
resources among relaying coalitions according to group size, and Intra-BEA,
local compensating and allocating rule within coalitions. Firstly, given the
global allotting policy, we introduce a fair allocation estimating approach
which includes remunerating for relaying cost using Myerson value for partition
function game, to enlighten the design of local allocating rules. Secondly,
given the inter- and intra-BEA relay fostering approach, we check stability of
coalition structures in terms of internal and external stability as well as
inductive core. Theoretic analysis and numerical simulation show that our
measure can provide communication opportunities for outer ring nodes and
enlarge system coverage, while at the same time provide enough motivation with
respect to resource allocation and energy saving for nodes in inner and middle
ring to relay for own profits.


title: Fermion dispersion in axion medium

abstract:
  The interaction of a fermion with the dense axion medium is investigated for
the purpose of finding an axion medium effect on the fermion dispersion. It is
shown that axion medium influence on the fermion dispersion under astrophysical
conditions is negligible small if the correct Lagrangian of the axion-fermion
interaction is used.


title:
On the stability bounds in a problem of convection with uniform internal
  heat source

abstract:
  Two Galerkin methods are applied to a problem of convection with uniform
internal heat source are given. With each method analytical results are
obtained and discussed. They concern the parameter representing the heating
rate. Numerical results are also given and they agree well with the existing
ones.


title: Phonon Thermal Conduction in Graphene

abstract:
  We investigated theoretically the phonon thermal conductivity of single layer
graphene. The phonon dispersion for all polarizations and crystallographic
directions in graphene lattice was obtained using the valence-force field
method. The three-phonon Umklapp processes were treated exactly using an
accurate phonon dispersion and Brillouin zone, and accouting for all phonon
relaxation channels allowed by the momentum and energy conservation laws. The
uniqueness of graphene was reflected in the two-dimensional phonon density of
states and restrictions on the phonon Umklapp scattering phase-space. The
phonon scattering on defects and graphene edges has been also included in the
model. The calculations were performed for the Gruneisen parameter, which was
determined from the ab initio theory as a function of the phonon wave vector
and polarization branch, and for a range of values from experiments. It was
found that the near room-temperature thermal conductivity of single layer
graphene, calculated with a realistic Gruneisen parameter, is in the range ~
2000 - 5000 W/mK depending on the defect concentration and roughness of the
edges. Owing to the long phonon mean free path the graphene edges produce
strong effect on thermal conductivity even at room temperature. The obtained
results are in good agreement with the recent measurements of the thermal
conductivity of suspended graphene.


title: Neutrino dispersion in magnetized plasma

abstract:
  The neutrino dispersion in the charge symmetric magnetized plasma is
investigated. We have studied the plasma contribution into the additional
energy of neutrino and obtained the simple expression for it. We consider in
detail the neutrino self-energy under physical conditions of weak field,
moderate field and strong field limits. It is shown that our result for
neutrino dispersion in moderate magnetic field differ substantially from the
previous one in the literature.


title:
Lepton-number-violating decays of singly-charged Higgs bosons in the
  minimal type-(I+II) seesaw model at the TeV scale

abstract:
  The lepton-number-violating decays of singly-charged Higgs bosons H^\pm are
investigated in the minimal type-(I+II) seesaw model with one SU(2)_L Higgs
triplet \Delta and one heavy Majorana neutrino N_1 at the TeV scale. We find
that the branching ratios {\cal B}(H^+ \to l^+_\alpha{\bar \nu}) (for \alpha =
e, \mu, \tau) depend not only on the mass and mixing parameters of three light
neutrinos \nu_i (for i = 1, 2, 3) but also on those of N_1. Assuming the mass
of N_1 to lie in the range of 200 GeV to 1 TeV, we figure out the generous
interference bands for the contributions of \nu_i and N_1 to {\cal B}(H^+ \to
l^+_\alpha{\bar \nu}). We illustrate some salient features of such interference
effects by considering three typical mass patterns of \nu_i, and show that the
relevant Majorana CP-violating phases can affect the magnitudes of {\cal B}(H^+
\to l^+_\alpha{\bar \nu}) in this parameter region.


title:
Signatures of the Baryon Acoustic Oscillations on the Convergence Power
  Spectrum of Weak lensing by Large Scale Structure

abstract:
  We employ an analytical approach to investigate the signatures of Baryon
Acoustic Oscillations (BAOs) on the convergence power spectrum of weak lensing
by large scale structure. It is shown that the BAOs wiggles can be found in
both of the linear and nonlinear convergence power spectra of weak lensing at
about $40\le l\le600$, but they are weaker than that of matter power spectrum.
Although the statistical error for LSST are greatly smaller than that of CFHT
and SNAP survey especially at about $30<l<300$, they are still larger than the
their maximum variations of BAOs wiggles. Thus, the detection of BAOs with the
ongoing and upcoming surveys such as LSST, CFHT and SNAP survey confront a
technical challenge.


title:
Discriminating different scenarios to account for the cosmic $e^\pm$
  excess by synchrotron and inverse Compton radiation

abstract:
  The excesses of the cosmic positron fraction recently measured by PAMELA and
the electron spectra by ATIC, PPB-BETS, Fermi and H.E.S.S. indicate the
existence of primary electron and positron sources. The possible explanations
include dark matter annihilation, decay, and astrophysical origin, like
pulsars. In this work we show that these three scenarios can all explain the
experimental results of the cosmic $e^\pm$ excess. However, it may be difficult
to discriminate these different scenarios by the local measurements of
electrons and positrons. We propose possible discriminations among these
scenarios through the synchrotron and inverse Compton radiation of the primary
electrons/positrons from the region close to the Galactic center. Taking
typical configurations, we find the three scenarios predict quite different
spectra and skymaps of the synchrotron and inverse Compton radiation, though
there are relatively large uncertainties. The most prominent differences come
from the energy band $10^4\sim 10^9$ MHz for synchrotron emission and $\gtrsim
10$ GeV for inverse Compton emission. It might be able to discriminate at least
the annihilating dark matter scenario from the other two given the high
precision synchrotron and diffuse $\gamma$-ray skymaps in the future.


title: Tools for Charged Higgs Bosons

abstract:
  In order to identify the Higgs sector realized in nature, the predictions for
Higgs boson masses, production cross sections and decay widths have to be
compared with experimental results. We give a brief overview about computer
codes for the evaluation of the properties of charged Higgs bosons, mostly
focusing on the case of the Minimal Supersymmetric Standard Model (MSSM). We
briefly review the relevance of the various contributions to the charged MSSM
Higgs boson mass arising at the one-loop level.


title: Charged MSSM Higgs Bosons at CMS: Reach and Parameter Dependence

abstract:
  We review the analysis of the 5 sigma discovery contours for the charged MSSM
Higgs boson at the CMS experiment with 30 fb^-1 for the two cases M_H+ < m_t
and M_H+ > m_t. Latest results for the CMS experimental sensitivities based on
full simulation studies are combined with state-of-the-art theoretical
predictions of MSSM Higgs-boson production and decay properties. Special focus
is put on the SUSY parameter dependence of the 5 sigma contours. The variation
of mu can shift the prospective discovery reach in tan_beta by up to Delta
tan_beta = 40. We furthermore discuss various theory uncertainties on the
signal cross section and branching ratio calculations. In order to arrive at a
reliable interpretation of a signal of the charged MSSM Higgs boson at the LHC
a strong reduction in the relevant theory uncertainties will be necessary.


title:
Antiphase dynamics in a multimode semiconductor laser with optical
  injection

abstract:
  A detailed experimental study of antiphase dynamics in a two-mode
semiconductor laser with optical injection is presented. The device is a
specially designed Fabry-Perot laser that supports two primary modes with a THz
frequency spacing. Injection in one of the primary modes of the device leads to
a rich variety of single and two-mode dynamical scenarios, which are reproduced
with remarkable accuracy by a four dimensional rate equation model. Numerical
bifurcation analysis reveals the importance of torus bifurcations in mediating
transitions to antiphase dynamics and of saddle-node of limit cycle
bifurcations in switching of the dynamics between single and two-mode regimes.


title: Topological String on Toric CY3s in Large Complex Structure Limit

abstract:
  We develop a non planar topological vertex formalism and we use it to study
the A-model partition function $\mathcal{Z}_{top}$ of topological string on the
class of toric Calabi-Yau threefolds (CY3) in large complex structure limit. To
that purpose, we first consider the $T^{2}\times R$ special Lagrangian
fibration of generic CY3-folds and we give the realization of the class of
large $\mu $ toric CY3-folds in terms of supersymmetric gauged linear sigma
model with \emph{non zero} gauge invariant superpotentials $% \mathcal{W}(\Phi
) $. Then, we focus on a one complex parameter supersymmetric $U(1) $ gauged
model involving six chiral superfields ${\Phi_{i}}$ with $\mathcal{W}=\mu
(\prod\nolimits_{i=0}^{5}\Phi_{i}) $ and we use it to compute the function
$\mathcal{Z}_{top}$ for the case of the local elliptic curve in the limit $\mu
\to \infty $.


title: Zero-nonzero patterns for nilpotent matrices over finite fields

abstract:
  Fix a field F. A zero-nonzero pattern A is said to be potentially nilpotent
over F if there exists a matrix with entries in F with zero-nonzero pattern A
that allows nilpotence. In this paper we initiate an investigation into which
zero-nonzero patterns are potentially nilpotent over F, with a special emphasis
on the case that F = Z_p is a finite field. As part of this investigation, we
develop methods, using the tools of algebraic geometry and commutative algebra,
to eliminate zero-nonzero patterns A as being potentially nilpotent over any
field F. We then use these techniques to classify all irreducible zero-nonzero
patterns of order two and three that are potentially nilpotent over Z_p for
each prime p.


title: Efimov effect from functional renormalization

abstract:
  We apply a field-theoretic functional renormalization group technique to the
few-body (vacuum) physics of non-relativistic atoms near a Feshbach resonance.
Three systems are considered: one-component bosons with U(1) symmetry,
two-component fermions with U(1)\times SU(2) symmetry and three-component
fermions with U(1) \times SU(3) symmetry. We focus on the scale invariant
unitarity limit for infinite scattering length. The exact solution for the
two-body sector is consistent with the unitary fixed point behavior for all
considered systems. Nevertheless, the numerical three-body solution in the
s-wave sector develops a limit cycle scaling in case of U(1) bosons and SU(3)
fermions. The Efimov parameter for the one-component bosons and the
three-component fermions is found to be approximately s=1.006, consistent with
the result of Efimov.


title: Herwig++ 2.3 Release Note

abstract:
  A new release of the Monte Carlo program Herwig++ (version 2.3) is now
available. This version includes a number of improvements including: the
extension of the program to lepton-hadron collisions; the inclusion of several
processes accurate at next-to-leading order in the POsitive Weight Hardest
Emission Generator (POWHEG) scheme; the inclusion of three-body decays and
finite-width effects in Beyond the Standard Model (BSM) physics processes; a
new procedure for reconstructing the kinematics of the parton shower based on
the colour structure of the hard scattering process; a new model for baryon
decays including excited baryon multiplets; the addition of a soft component to
the multiple scattering model of the underlying event; new matrix elements for
Deep Inelastic Scattering (DIS) and e+e- processes.


title: Non-relativistic holography

abstract:
  We consider holography for d-dimensional scale invariant but non-Lorentz
invariant field theories, which do not admit the full Schrodinger symmetry
group. We find new realizations of the corresponding (d+1)-dimensional gravity
duals, engineered with a variety of matter Lagrangians, and their finite
temperature generalizations. The thermodynamic properties of the finite
temperature backgrounds are precisely those expected for anisotropic, scale
invariant field theories. The brane and string theory realizations of such
backgrounds are briefly discussed, along with their holographic interpretation
in terms of marginal but non Lorentz invariant deformations of conformal field
theories. We initiate discussion of holographic renormalization in these
backgrounds, and note that such systematic renormalization is necessary to
obtain the correct behavior of correlation functions.


title: Measurements of Cherenkov Photons with Silicon Photomultipliers

abstract:
  A novel photon detector, the Silicon Photomultiplier (SiPM), has been tested
in proximity focusing Ring Imaging Cherenkov (RICH) counters that were exposed
to cosmic-ray particles in Ljubljana, and a 2 GeV electron beam at the KEK
research facility. This type of RICH detector is a candidate for the particle
identification detector upgrade of the BELLE detector at the KEK B-factory, for
which the use of SiPMs, microchannel plate photomultiplier tubes or hybrid
avalanche photodetectors, rather than traditional Photomultiplier Tubes (PMTs)
is essential due to the presence of high magnetic fields. In both experiments,
SiPMs are found to compare favourably with PMTs, with higher photon detection
rates per unit area. Through the use of hemispherical and truncated pyramid
light guides to concentrate photons onto the active surface area, the light
yield increases significantly. An estimate of the contribution to dark noise
from false coincidences between SiPMs in an array is also presented.


title:
Coherent pumping of a Mott insulator: Fermi golden rule versus Rabi
  oscillations

abstract:
  Cold atoms provide a unique arena to study many-body systems far from
equilibrium. Furthermore, novel phases in cold atom systems are conveniently
investigated by dynamical probes pushing the system out of equilibrium. Here,
we discuss the pumping of doubly-occupied sites in a fermionic Mott insulator
by a periodic modulation of the hopping amplitude. We show that deep in the
insulating phase the many-body system can be mapped onto an effective two-level
system which performs coherent Rabi oscillations due to the driving. Coupling
the two-level system to the remaining degrees of freedom renders the Rabi
oscillations damped. We compare this scheme to an alternative description where
the particles are incoherently pumped into a broad continuum.


title:
Topological features of massive bosons on two dimensional Einstein
  space-time

abstract:
  In this paper we tackle the problem of constructing explicit examples of
topological cocycles of Roberts' net cohomology, as defined abstractly by
Brunetti and Ruzzi. We consider the simple case of massive bosonic quantum
field theory on the two dimensional Einstein cylinder. After deriving some
crucial results of the algebraic framework of quantization, we address the
problem of the construction of the topological cocycles. All constructed
cocycles lead to unitarily equivalent representations of the fundamental group
of the circle (seen as a diffeomorphic image of all possible Cauchy surfaces).
The construction is carried out using only Cauchy data and related net of local
algebras on the circle.


title:
Electronic structure of optimally doped pnictide
  Ba$_{0.6}$K$_{0.4}$Fe$_2$As$_2$: a comprehensive ARPES investigation

abstract:
  We have conducted a comprehensive angle-resolved photoemission study on the
normal state electronic structure of the Fe-based superconductor
Ba$_{0.6}$K$_{0.4}$Fe$_2$As$_2$. We have identified four dispersive bands which
cross the Fermi level and form two hole-like Fermi surfaces around $\Gamma$ and
two electron-like Fermi surfaces around M. There are two nearly nested Fermi
surface pockets connected by an antiferromagnetic ($\pi$, $\pi$) wavevector.
The observed Fermi surfaces show small $k_z$ dispersion and a total volume
consistent with Luttinger theorem. Compared to band structure calculations, the
overall bandwidth is reduced by a factor of 2. However, many low energy
dispersions display stronger mass renormalization by a factor of $\sim$ 4,
indicating possible orbital (energy) dependent correlation effects. Using an
effective tight banding model, we fitted the band structure and the Fermi
surfaces to obtain band parameters reliable for theoretical modeling and
calculations of the important physical quantities, such as the specific heat
coefficient.


title:
U(1)-Symmetry breaking and violation of axial symmetry in TlCuCl3 and
  other insulating spin systems

abstract:
  We describe the Bose-Einstein condensate of magnetic bosonic quasiparticles
in insulating spin systems using a phenomenological standard functional method
for T = 0. We show that results that are already known from advanced
computational techniques immediately follow. The inclusion of a perturbative
anisotropy term that violates the axial symmetry allows us to remarkably well
explain a number of experimental features of the dimerized spin-1/2 system
TlCuCl3. Based on an energetic argument we predict a general intrinsic
instability of an axially symmetric magnetic condensate towards a violation of
this symmetry, which leads to the spontaneous formation of an anisotropy gap in
the energy spectrum above the critical field. We, therefore, expect that a true
Goldstone mode in insulating spin systems, i.e., a strictly linear
energy-dispersion relation down to arbitrarily small excitations energies,
cannot be observed in any real material.


title: Bayesian approach and Naturalness in MSSM analyses for the LHC

abstract:
  The start of LHC has motivated an effort to determine the relative
probability of the different regions of the MSSM parameter space, taking into
account the present, theoretical and experimental, wisdom about the model.
Since the present experimental data are not powerful enough to select a small
region of the MSSM parameter space, the choice of a judicious prior probability
for the parameters becomes most relevant. Previous studies have proposed
theoretical priors that incorporate some (conventional) measure of the
fine-tuning, to penalize unnatural possibilities. However, we show that such
penalization arises from the Bayesian analysis itself (with no ad hoc
assumptions), upon the marginalization of the mu-parameter. Furthermore the
resulting effective prior contains precisely the Barbieri-Giudice measure,
which is very satisfactory. On the other hand we carry on a rigorous treatment
of the Yukawa couplings, showing in particular that the usual practice of
taking the Yukawas "as required", approximately corresponds to taking
logarithmically flat priors in the Yukawa couplings. Finally, we use an
efficient set of variables to scan the MSSM parameter space, trading in
particular B by tan beta, giving the effective prior in the new parameters.
Beside the numerical results, we give accurate analytic expressions for the
effective priors in all cases. Whatever experimental information one may use in
the future, it is to be weighted by the Bayesian factors worked out here.


title: Sociology of Modern Cosmology

abstract:
  Certain results of observational cosmology cast critical doubt on the
foundations of standard cosmology but leave most cosmologists untroubled.
Alternative cosmological models that differ from the Big Bang have been
published and defended by heterodox scientists; however, most cosmologists do
not heed these. This may be because standard theory is correct and all other
ideas and criticisms are incorrect, but it is also to a great extent due to
sociological phenomena such as the "snowball effect" or "groupthink". We might
wonder whether cosmology, the study of the Universe as a whole, is a science
like other branches of physics or just a dominant ideology.


title:
Inelastic X-ray Scattering by Electronic Excitations in Solids at High
  Pressure

abstract:
  Investigating electronic structure and excitations under extreme conditions
gives access to a rich variety of phenomena. High pressure typically induces
behavior such as magnetic collapse and the insulator-metal transition in 3d
transition metals compounds, valence fluctuations or Kondo-like characteristics
in $f$-electron systems, and coordination and bonding changes in molecular
solids and glasses. This article reviews research concerning electronic
excitations in materials under extreme conditions using inelastic x-ray
scattering (IXS). IXS is a spectroscopic probe of choice for this study because
of its chemical and orbital selectivity and the richness of information it
provides. Being an all-photon technique, IXS has a penetration depth compatible
with high pressure requirements. Electronic transitions under pressure in 3d
transition metals compounds and $f$-electron systems, most of them strongly
correlated, are reviewed. Implications for geophysics are mentioned. Since the
incident X-ray energy can easily be tuned to absorption edges, resonant IXS,
often employed, is discussed at length. Finally studies involving local
structure changes and electronic transitions under pressure in materials
containing light elements are briefly reviewed.


title:
Exclusive Vector Meson Production and Deeply Virtual Compton Scattering
  at HERA

abstract:
  Exclusive vector meson production and deeply virtual Compton scattering are
ideally suited reactions for studying the structure of the proton and the
transition from soft to hard processes. The main experimental data obtained at
HERA are summarised and presented in the light of QCD approaches.


title: On sums of three squares

abstract:
  We prove that a positive integer not of the form, 4^{k}(8m+7) can be
expressible as a sum of three or fewer squares by using some results of Kane
and Sun on mixed sums of squares and triangular numbers.


title: Experimental Test of Analytic Theory of Spin Torque Oscillator Dynamics

abstract:
  We make measurements of power spectral density of the microwave voltage
emitted by a spin torque nano-oscillator (STNO) and compare our experimental
results to predictions of an analytic theory of a single-mode STNO dynamics by
V. S. Tiberkevich, A. N. Slavin, J. V. Kim,[Phys. Rev. B 78, 092401 (2008)]. We
find that a complete set of the oscillator spectral properties: power,
frequency, spectral line width and line shape as functions of current are
self-consistently described by the analytic theory for moderate amplitudes of
oscillations (< 70 degrees).


title: Theoretical study of the magnetism in the incommensurate phase of TiOCl

abstract:
  Going beyond a recently proposed microscopic model for the incommensurate
transition in the spin-Peierls TiOX (X=Cl, Br) compounds, in the present work
we start by studying the thermodynamics of the model with XY spins and
adiabatic phonons. We find that the system enters in an incommensurate phase by
a first order transition at a low temperature $T_{c1}$. At a higher temperature
$T_{c2}$ a continuous transition to a uniform phase is found. Furthermore, we
study the magnetism in the incommensurate phase by Density Matrix
Renormalization Group (DMRG) calculations on a 1D Heisenberg model where the
exchange is modulated by the incommensurate atomic position pattern. When the
wave vector $q$ of the modulation is near $\pi$, we find local magnetized zones
(LMZ) in which spins get free from their singlets as a result of the domain
walls induced by the modulated distortion. When $q$ moves away enough from
$\pi$, the LMZ disappear and the system develops incommensurate magnetic
correlations induced by the structure. We discuss the relevance of this result
regarding to previous and future experiments in TiOCl.


title:
Supersymmetry breaking and gauge mediation in models with a generic
  superpotential

abstract:
  We present a general scheme for finding or creating a metastable vacuum in
supersymmetric theories. By using the formalism, we show that there is a
parameter region where a metastable vacuum exists in the Wess-Zumino model
coupled to messenger fields. This model serves as a perturbative renormalizable
model of direct gauge mediation.


title: On the large genus asymptotics of Weil-Petersson volumes

abstract:
  A relatively fast algorithm for evaluating Weil-Petersson volumes of moduli
spaces of complex algebraic curves is proposed. On the basis of numerical data,
a conjectural large genus asymptotics of the Weil-Petersson volumes is
computed. Asymptotic formulas for the intersection numbers involving
$\psi$-classes are conjectured as well. The accuracy of the formulas is high
enough to believe that they are exact.


title: Non-linear Evolution of f(R) Cosmologies III: Halo Statistics

abstract:
  The statistical properties of dark matter halos, the building blocks of
cosmological observables associated with structure in the universe, offer many
opportunities to test models for cosmic acceleration, especially those that
seek to modify gravitational forces. We study the abundance, bias and profiles
of halos in cosmological simulations for one such model: the modified action
f(R) theory. In the large field regime that is accessible to current
observations, enhanced gravitational forces raise the abundance of rare massive
halos and decrease their bias but leave their (lensing) mass profiles largely
unchanged. This regime is well described by scaling relations based on a
modification of spherical collapse calculations. In the small field regime,
enhanced forces are suppressed inside halos and the effects on halo properties
are substantially reduced for the most massive halos. Nonetheless, the scaling
relations still retain limited applicability for the purpose of establishing
conservative upper limits on the modification to gravity.


title: Search for Primordial Black Holes with SGARFACE

abstract:
  The Short GAmma Ray Front Air Cherenkov Experiment (SGARFACE) uses the
Whipple 10 m telescope to search for bursts of $\gamma$ rays. SGARFACE is
sensitive to bursts with duration from a few ns to $\sim$20 $\mu$s and with
$\gamma$-ray energy above 100 MeV. SGARFACE began operating in March 2003 and
has collected 2.2 million events during an exposure time of 2267 hours. A
search for bursts of $\gamma$ rays from explosions of primordial black holes
(PBH) was carried out. A Hagedorn-type PBH explosion is predicted to be visible
within 60 pc of Earth. Background events were caused by cosmic rays and by
atmospheric phenomena and their rejection was accomplished to a large extent
using the time-resolved images. No unambiguous detection of bursts of $\gamma$
rays could be made as the remaining background events mimic the expected shape
and time development of bursts. Upper limits on the PBH explosion rate were
derived from the SGARFACE data and are compared to previous and future
experiments. We note that a future array of large wide-field air-Cherenkov
telescopes equipped with a SGARFACE-like trigger would be able to operate
background-free with a 20 to 30 times higher sensitivity for PBH explosions.


title:
kappa-Deformed Oscillators: Deformed Multiplication Versus Deformed Flip
  Operator and Multiparticle Clusters

abstract:
  We transform the oscillator algebra with kappa-deformed multiplication rule,
proposed in [1],[2], into the oscillator algebra with kappa-deformed flip
operator and standard multiplication. We recall that the kappa-multiplication
of the kappa-oscillators puts them off-shell. We study the explicit forms of
modified mass-shell conditions in both formulations: with kappa-multiplication
and with kappa-flip operation. On the example of kappa-deformed 2-particle
states we study the clustered nonfactorizable form of the kappa-deformed
multiparticle states. We argue that the kappa-deformed star product of two free
fields leads in similar way to a nonfactorizable kappa-deformed bilocal field.
We conclude with general remarks concerning the kappa-deformed n-particle
clusters and kappa-deformed star product of n fields.


title: Metric and arithmetic properties of mediant-Rosen maps

abstract:
  A continued fractions based verification of the Hurwitz values for the Hecke
triangle groups is given, completing a program of Lehner's. Ergodic theory
shows that Diophantine approximation by mediant convergents of the Rosen
continued fractions is sufficient to determine the values that Haas and Series
found by hyperbolic geometry.


title:
On the ability of various circular inspiral templates to capture
  inspiral gravitational waves from compact binaries having tiny orbital
  eccentricities

abstract:
  We probe the ability of various types of post-Newtonian(PN)-accurate circular
templates to capture inspiral gravitational-wave (GW) signals from compact
binaries having tiny orbital eccentricities. The GW signals are constructed by
adapting the phasing formalism, available in T. Damour, A. Gopakumar, and B. R.
Iyer, [Phys. Rev. D 70, 064028 (2004)], employing the orbital energy and the
time-eccentricity to describe the orbital evolution. Using the fitting factor
estimates, relevant for the initial LIGO, we show that circular templates,
based on the adiabatic TaylorT1, complete adiabatic TaylorT1 and TaylorT4
approximants are unable to capture our GW signals from compact binaries having
tiny residual orbital eccentricities. However, the 2PN-order circular inspiral
templates based on the recently introduced TaylorEt approximant are found to be
both effectual and faithful in capturing GWs from inspiralling compact binaries
having moderate eccentricities and we provide physical explanations for our
observations.


title:
Avoiding the polarization catastrophe in LaAlO3 overlayers on
  SrTiO3(001) through a polar distortion

abstract:
  A pronounced uniform polar distortion extending over several unit cells
enables thin LaAlO3 overlayers on SrTiO3(001) to counteract the charge dipole
and thereby neutralize the "polarization catastrophe" that is suggested by
simple ion-counting. This unanticipated mechanism, obtained from density
functional theory calculations, allows several unit cells of the LaAlO3
overlayer to remain insulating (hence, fully ionic). The band gap of the
system, defined by occupied O $2p$ states at the surface and unoccupied Ti 3d
states at the interface in some cases $\sim$20 \AA distant, decreases with
increasing thickness of the LaAlO3-film before an insulator-to-metal transition
and a crossover to an electronic reconstruction occurs at around five
monolayers of LaAlO3.