title:
Amorphous GdFeCo Films Exhibiting Large and Tunable Perpendicular
  Magnetic Anisotropy

abstract:
  We report the compositional and temperature dependence of magnetic
compensation in amorphous GdFeCo films. Magnetic compensation is attributed to
the competition between antiferromagnetic coupling of rare-earth with
transition-metal (TM) ions and ferromagnetic interaction between the TM ions.
The low-Gd region from 20 to 34 at. % was found to exhibit compensation
phenomena characterized by a low saturation magnetization and perpendicular
magnetic anisotropy (PMA) near the compensation temperature. Compensation
temperature was not observed in previously unreported high-Gd region from 52 to
59 at. %, in qualitative agreement with results from recent model calculations.
However, low magnetization was achieved at room temperature, accompanied by a
large PMA with coercivity reaching ~6.6 kOe. The observed perpendicular
magnetic anisotropy of amorphous GdFeCo films probably has a structural origin
consistent with certain aspects of the atomic-scale anisotropy. Our findings
have broadened the composition range of transition metal-rare earth alloys for
designing PMA films, making it attractive for tunable magnetic anisotropy in
nanoscale devices.


title:
Markov semigroups with hypocoercive-type generator in Infinite
  Dimensions: Ergodicity and Smoothing

abstract:
  We start by considering infinite dimensional Markovian dynamics in R^m
generated by operators of hypocoercive type and for such models we obtain short
and long time pointwise estimates for all the derivatives, of any order and in
any direction, along the semigroup. We then look at infinite dimensional models
(in (Rm)^{Z ^d}) produced by the interaction of infinitely many finite
dimensional dissipative dynamics of the type indicated above. For these
infinite dimensional models we study finite speed of propagation of
information, well-posedness of the semigroup, time behaviour of the derivatives
and strong ergodicity problem.


title:
Markov semigroups with hypocoercive-type generator in Infinite
  Dimensions II: Applications

abstract:
  In this paper we show several applications of the general theory developed in
\cite{MV_I}, where we studied smoothing and ergodicity for infinite dimensional
Markovian systems with hypocoercive type generator.


title:
Broad Balmer line emission and cosmic ray acceleration efficiency in
  supernova remnant shocks

abstract:
  Balmer emission may be a powerful diagnostic tool to test the paradigm of
cosmic ray (CR) acceleration in young supernova remnant (SNR) shocks. The width
of the broad Balmer line is a direct indicator of the downstream plasma
temperature. In case of efficient particle acceleration an appreciable fraction
of the total kinetic energy of the plasma is channeled into CRs, therefore the
downstream temperature decreases and so does the broad Balmer line width. This
width also depends on the level of thermal equilibration between ions and
neutral hydrogen atoms in the downstream. Since in general in young SNR shocks
only a few charge exchange (CE) reactions occur before ionization,
equilibration between ions and neutrals is not reached, and a kinetic
description of the neutrals is required in order to properly compute Balmer
emission.
  We provide a method for the calculation of Balmer emission using a
self-consistent description of the shock structure in the presence of neutrals
and CRs. We use a recently developed semi-analytical approach, where neutral
particles, ionized plasma, accelerated particles and magnetic fields are all
coupled together through the mass, momentum and energy flux conservation
equations. The distribution of neutrals is obtained from the full Boltzmann
equation in velocity space, coupled to Maxwellian ions through ionization and
CE processes. The computation is also improved with respect to previous work
thanks to a better approximation for the atomic interaction rates. We find that
for shock speeds >2500km/s the distribution of broad neutrals never approaches
a Maxwellian and its moments differ from those of the ionized component. These
differences reflect into a smaller FWHM than predicted in previous
calculations, where thermalization was assumed. The method presented here
provides a realistic estimate of particle acceleration efficiency in Balmer
dominated shocks.


title: Proton Kinetic Effects in Vlasov and Solar Wind Turbulence

abstract:
  Kinetic plasma processes have been investigated in the framework of solar
wind turbulence, employing Hybrid Vlasov-Maxwell (HVM) simulations. The
dependency of proton temperature anisotropy T_{\perp}/T_{\parallel} on the
parallel plasma beta \beta_{\parallel}, commonly observed in spacecraft data,
has been recovered using an ensemble of HVM simulations. By varying plasma
parameters, such as plasma beta and fluctuation level, the simulations explore
distinct regions of the parameter space given by T_{\perp}/T_{\parallel} and
\beta_{\parallel}, similar to solar wind sub-datasets. Moreover, both
simulation and solar wind data suggest that temperature anisotropy is not only
associated with magnetic intermittent events, but also with gradient-type
structures in the flow and in the density. This connection between
non-Maxwellian kinetic effects and various types of intermittency may be a key
point for understanding the complex nature of plasma turbulence.


title:
Searching for minicharged particles via birefringence, dichroism and
  Raman spectroscopy of the vacuum polarized by a high-intensity laser wave

abstract:
  Absorption and dispersion of probe photons in the field of a high-intensity
circularly polarized laser wave are investigated. The optical theorem is
applied for determining the absorption coefficients in terms of the imaginary
part of the vacuum polarization tensor. Compact expressions for the vacuum
refraction indices and the photon absorption coefficients are obtained in
various asymptotic regimes of interest. The outcomes of this analysis reveal
that, far from the region relatively close to the threshold of the two-photon
reaction, the birefringence and dichroism of the vacuum are small and, in some
cases, strongly suppressed. On the contrary, in a vicinity of the region in
which the photo-production of a pair occurs, these optical properties are
manifest with lasers of moderate intensities. We take advantage of such a
property in the search of minicharged particles by considering high-precision
polarimetric experiments. In addition, Raman-like electromagnetic waves
resulting from the inelastic part of the vacuum polarization tensor are
suggested as an alternative form for finding exclusion limits on these
hypothetical charge carriers. The envisaged parameters of upcoming
high-intensity laser facilities are used for establishing upper bounds on the
minicharged particles.


title: Scattering and bound states for nonselfadjoint Schr\"odinger operator

abstract:
  Spectral components of one-dimensional Schr\"odinger operator with complex
potential are investigated. An effective upper bound for the total number of
eigenvalues and spectral singularities is established. For dissipative
Schr\"odinger operator sufficient condition is found which guarantees the
absence of singular component in the continuous spectrum and spectral
decomposition is exposed.


title: Harmony Perception by Periodicity Detection

abstract:
  The perception of consonance/dissonance of musical harmonies is strongly
correlated with their periodicity. This is shown in this article by
consistently applying recent results from psychophysics and neuroacoustics,
namely that the just noticeable difference between pitches for humans is about
1% for the musically important low frequency range and that periodicities of
complex chords can be detected in the human brain. Based thereon, the concepts
of relative and logarithmic periodicity with smoothing are introduced as
powerful measures of harmoniousness. The presented results correlate
significantly with empirical investigations on the perception of chords. Even
for scales, plausible results are obtained. For example, all classical church
modes appear in the front ranks of all theoretically possible seven-tone
scales.


title:
Evidence for Adsorbate-Enhanced Field Emission from Carbon Nanotube
  Fibers

abstract:
  We used residual gas analysis (RGA) to identify the species desorbed during
field emission (FE) from a carbon nanotube (CNT) fiber. The RGA data show a
sharp threshold for H2 desorption at an external field strength that coincides
with a breakpoint in the FE data. A comprehensive model for the gradual
transition of FE from adsorbate-enhanced CNTs at low bias to FE from CNTs with
reduced H2 adsorbate coverage at high bias is developed which accounts for the
gradual desorption of the H2 adsorbates, alignment of the CNTs at the fiber
tip, and importance of self-heating effects with applied bias.


title: Large-distance properties of holographic baryons

abstract:
  Employing the asymptotic instanton solution in an arbitrary background of a
set of holographic QCD models, we show that baryon form factors have a precise
large-distance behaviour regardless of the background. The dependence coincides
with that obtained from general chiral soliton models and large-$N_C$ chiral
perturbation theory. The nonlinear terms in the equations of motion are
necessary to recover the correct results. We also show that the holographic
currents have the right structure at low energy if the solutions of the full
equation of motion, instead of the linearized ones, are used. The indication is
that in this holographic approach, the linearized approximation used in the
meson sector is not appropriate for the solitonic description of the baryons.


title:
Lepton Asymmetries for the $B_s -> \gamma l^+ l^- $ Decay in a Family
  Nonuniversal Z' Model

abstract:
  The exclusive $B_s -> \gamma l^+ l^- $ decay is analyzed in the framework of
a family nonuniversal Z' model by calculating the differential branching ratio,
double lepton polarizations and forward-backward asymmetries. Our results are
compared against those of the Standard Model. The predictions of this work are
hoped to can be tested in the near future at LHCb.


title: On the Convergence of Adaptive Sequential Monte Carlo Methods

abstract:
  In several implementations of Sequential Monte Carlo (SMC) methods it is
natural, and important in terms of algorithmic efficiency, to exploit the
information of the history of the samples to optimally tune their subsequent
propagations. In this article we provide a carefully formulated asymptotic
theory for a class of such \emph{adaptive} SMC methods. The theoretical
framework developed here will cover, under assumptions, several commonly used
SMC algorithms. There are only limited results about the theoretical
underpinning of such adaptive methods: we will bridge this gap by providing a
weak law of large numbers (WLLN) and a central limit theorem (CLT) for some of
these algorithms. The latter seems to be the first result of its kind in the
literature and provides a formal justification of algorithms used in many real
data context. We establish that for a general class of adaptive SMC algorithms
the asymptotic variance of the estimators from the adaptive SMC method is
\emph{identical} to a so-called `perfect' SMC algorithm which uses ideal
proposal kernels. Our results are supported by application on a complex
high-dimensional posterior distribution associated with the Navier-Stokes
model, where adapting high-dimensional parameters of the proposal kernels is
critical for the efficiency of the algorithm.


title:
A Gross--Kohnen--Zagier Type Theorem for Higher-Codimensional Heegner
  Cycles

abstract:
  We prove that Heegner cycles of codimension m+1 inside Kuga-Sato type
varieties of dimension 2m+1 are coefficients of modular forms of weight 3/2+m
in the appropriate quotient group. The main technical tool for generating the
necessary relations is a Borcherds style theta lift with polynomials. We also
show how this lift defines a new singular Shimura-type correspondence from
weakly holomorphic modular forms of weight 1/2-m to meromorphic modular forms
of weight 2m+2.


title: A framework for Higgs characterisation

abstract:
  We introduce a framework, based on an effective field theory approach, that
allows one to perform characterisation studies of the boson recently discovered
at the LHC, for all the relevant channels and in a consistent, systematic and
accurate way. The production and decay of such a boson with various spin and
parity assignments can be simulated by means of multi-parton, tree-level matrix
elements and of next-to-leading order QCD calculations, both matched with
parton showers. Several sample applications are presented which show, in
particular, that beyond-leading-order effects in QCD have non-trivial
phenomenological implications.


title:
Breaking conformal invariance- Large N Chern-Simons theory coupled to
  massive fundamental fermions

abstract:
  We analyze the theory of massive fermions in the fundamental representation
coupled to a U(N) Chern-Simons gauge theory at level K. It is done in the large
N, large K limits where \lambda=N/K is kept fixed. Following arXiv:1110.4386 we
obtain the solution of a Schwinger-Dyson equation for the two point function,
the exact expression for the fermion propagator and the partition function at
finite temperature. We prove that in the large K limit there exists an infinite
set of classically conserved high spin currents also when a mass is introduced,
breaking the conformal invariance. In analogy to the seminal work of 't Hooft
on two dimensional QCD, we write down a Bethe-Salpeter equation for the wave
function of a "quark anti-quark" bound state. We show that unlike the two
dimensional QCD case, the three dimensional Chern-Simons theory does not admit
a confining spectrum.


title: Intrinsic alignments and 3d weak gravitational lensing

abstract:
  In this paper we show how intrinsic alignments can be incorporated
consistently in the formalism of 3d weak lensing. We use two different
descriptions of the intrinsic galaxy ellipticities, the so-called linear and
quadratic model, respectively. For both models we derive the covariance matrix
of the intrinsic alignment signal (II-alignments) and GI-alignments (the cross
correlation of intrinsic and lensing induced ellipticities). Evaluating the
covariance matrices for the linear model numerically and comparing the results
to the cosmic shear signal we find that for a low redshift survey the total
covariance matrix is dominated by the contributions of the II-alignments. For a
Euclid-like survey II-alignments still dominate over GI-alignments but they are
more than one order of magnitude smaller than the lensing signal. The shape of
the ellipticity covariance matrices is quite different in the k-k'-plane for
cosmic shear on the one hand and intrinsic alignments on the other hand. In
comparison to lensing both alignment types tend to be rather elongated along
the diagonal k=k'. Moreover, for high multipoles (l ~ 100) intrinsic alignments
are strongly concentrated along that diagonal.


title: The winner takes it all

abstract:
  We study competing first passage percolation on graphs generated by the
configuration model. At time 0, vertex 1 and vertex 2 are infected with the
type 1 and the type 2 infection, respectively, and an uninfected vertex then
becomes type 1 (2) infected at rate $\lambda_1$ ($\lambda_2$) times the number
of edges connecting it to a type 1 (2) infected neighbor. Our main result is
that, if the degree distribution is a power-law with exponent $\tau\in(2,3)$,
then, as the number of vertices tends to infinity and with high probability,
one of the infection types will occupy all but a finite number of vertices.
Furthermore, which one of the infections wins is random and both infections
have a positive probability of winning regardless of the values of $\lambda_1$
and $\lambda_2$. The picture is similar with multiple starting points for the
infections.


title: AGN feedback works both ways

abstract:
  Simulations of galaxy growth need to invoke strong negative feedback from
active galactic nuclei (AGN) to suppress the formation of stars and thus
prevent the over-production of very massive systems. While some observations
provide evidence for such negative feedback, other studies find either no
feedback, or even positive feedback, with increased star formation associated
with higher AGN luminosities. Here we report an analysis of several hundred AGN
and their host galaxies in the Chandra Deep Field South using X-ray and radio
data for sample selection. Combined with archival far infrared data as a
reliable tracer of star formation activity in the AGN host galaxies, we find
that AGN with pronounced radio jets exhibit a much higher star formation rate
than the purely X-ray selected ones, even at the same X-ray luminosities. This
difference implies that positive AGN feedback plays an important role, too, and
therefore has to be accounted for in all future simulation work. We interpret
this to indicate that the enhanced star formation rate of radio selected AGN
arises because of jet-induced star formation, as is hinted by the different jet
powers among our AGN samples, while the suppressed star formation rate of X-ray
selected AGN is caused by heating and photo-dissociation of molecular gas by
the hot AGN accretion disc.


title:
Measurement of the Azimuthal Angle Dependence of Inclusive Jet Yields in
  Pb+Pb Collisions at sqrt(s(NN))= 2.76 TeV with the ATLAS detector

abstract:
  Measurements of the variation of inclusive jet suppression as a function of
relative azimuthal angle, Delta phi, with respect to the elliptic event plane
provide insight into the path-length dependence of jet quenching. ATLAS has
measured the Delta phi dependence of jet yields in 0.14 nb^-1 of sqrt(s(NN))=
2.76 TeV Pb+Pb collisions at the LHC for jet transverse momenta p_T > 45 GeV in
different collision centrality bins using an underlying event subtraction
procedure that accounts for elliptic flow. The variation of the jet yield with
Delta phi was characterized by the parameter, v_2^jet, and the ratio of
out-of-plane (Delta phi ~ pi/2) to in-plane (Delta phi ~ 0) yields. Non-zero
v_2^jet values were measured in all centrality bins for p_T < 160 GeV. The jet
yields are observed to vary by as much as 20% between in-plane and out-of-plane
directions.


title: A module-theoretic approach to abelian automorphism groups

abstract:
  There are several examples in the literature of finite non-abelian $p$-groups
whose automorphism group is abelian. For some time only examples that were
special $p$-groups were known, until Jain and Yadav [JY12] and Jain, Rai and
Yadav [JRY13] constructed several non-special examples. In this paper we show
how a simple module-theoretic approach allows the construction of non-special
examples, starting from special ones constructed by several authors, while at
the same time avoiding further direct calculations.


title:
Experiments on wind-perturbed rogue wave hydrodynamics using the
  Peregrine breather model

abstract:
  Being considered as a prototype for description of oceanic rogue waves (RWs),
the Peregrine breather solution of the nonlinear Schr\"odinger equation (NLS)
has been recently observed and intensely investigated experimentally in
particular within the context of water waves. Here, we report the experimental
results showing the evolution of the Peregrine solution in the presence of wind
forcing in the direction of wave propagation. The results show the persistence
of the breather evolution dynamics even in the presence of strong wind and
chaotic wave field generated by it. Furthermore, we have shown that
characteristic spectrum of the Peregrine breather persists even at the highest
values of the generated wind velocities thus making it a viable characteristic
for prediction of rogue waves.


title: The dynamical state of the First Hydrostatic Core Candidate Cha-MMS1

abstract:
  Observations of First Hydrostatic Core candidates, a theoretically predicted
evolutionary link between the prestellar and protostellar phases, are vital for
probing the earliest phases of star formation. We aim to determine the
dynamical state of the First Hydrostatic Core candidate Cha-MMS1. We observed
Cha-MMS1 in various transitions with the APEX and Mopra telescopes. The
molecular emission was modeled with a radiative transfer code to derive
constraints on the envelope kinematics. We derive an internal luminosity of
0.08 - 0.18 Lsol. An average velocity gradient of 3.1(0.1) km/s/pc over 0.08 pc
is found perpendicular to the filament in which Cha-MMS1 is embedded. The
gradient is flatter in the outer parts and at the innermost 2000 - 4000 AU.
These features suggest solid-body rotation beyond 4000 AU and slower,
differential rotation beyond 8000 AU. The origin of the flatter gradient in the
innermost parts is unclear. The classical infall signature is detected in HCO+
3-2 and CS 2-1. The radiative transfer modeling indicates a uniform infall
velocity in the outer parts of the envelope. An infall velocity field scaling
with r^(-0.5) is consistent with the data for r < 9000 AU. The infall
velocities are 0.1 - 0.2 km/s at r > 3300 AU and 0.04 - 0.6 km/s at r < 3300
AU. Both the internal luminosity of Cha-MMS1 and the infall velocity field in
its envelope are consistent with predictions of MHD simulations for the first
core phase. There is no evidence for a fast, large-scale outflow stemming from
Cha-MMS1 but excess emission from the high-density tracers CS 5-4, CO 6-5, and
CO 7-6 suggests the presence of higher-velocity material at the inner core. Its
internal luminosity excludes Cha-MMS1 being a prestellar core. The kinematical
properties of its envelope are consistent with Cha-MMS1 being a first core
candidate or a very young Class 0 protostar.(abridged).


title:
High accuracy photoassociation of $^{40}$Ca near the ${^3P_1}+{^1S_0}$
  asymptote and its Zeeman effect

abstract:
  We report on the first measurement of narrow photoassociation lines of
$^{40}$Ca near the ${^3P_1}+{^1S_0}$ asymptote related to the molecular states
$^3\Pi_u$ and $^3\Sigma^+_u$. The highly accurate binding energies and Zeeman
splittings are well described by a coupled channel theoretical model,
confirming theoretical predictions of long-range coefficients. Our analysis
shows that only the inclusion of both energies and Zeeman splittings provides
an accurate description of the long-range interaction potentials.


title: Constraining new physics in B_s meson mixing

abstract:
  Neutral mesons exhibit a phenomenon called flavour mixing. As a consequence
of a second order weak process the flavour eigenstates corresponding to the
meson and its anti-meson are superpositions of two mass eigenstates. A meson
produced in a flavour state changes into an anti-meson and back again as a
function of time. Such flavour oscillations are considered sensitive probes of
physics beyond the Standard Model. In this brief review I summarize the status
of experimental constraints on mixing parameters in the B_s meson system.


title: A Spatially Resolved Vertical Temperature Gradient in the HD 163296 Disk

abstract:
  We analyze sensitive, sub-arcsecond resolution ALMA Science Verification
observations of CO emission lines in the protoplanetary disk hosted by the
young, isolated Ae star HD 163296. The observed spatial morphology of the 12CO
J=3-2 emission line is asymmetric across the major axis of the disk; the 12CO
J=2-1 line features a much less pronounced, but similar, asymmetry. The J=2-1
emission from 12CO and its main isotopologues have no resolved spatial
asymmetry. We associate this behavior as the direct signature of a vertical
temperature gradient and layered molecular structure in the disk. This is
demonstrated using both toy models and more sophisticated calculations assuming
non-local thermodynamic equilibrium (non LTE) conditions. A model disk
structure is developed to reproduce both the distinctive spatial morphology of
the 12CO J=3-2 line as well as the J=2-1 emission from the CO isotopologues
assuming relative abundances consistent with the interstellar medium. This
model disk structure has tau=1 emitting surfaces for the 12CO emission lines
that make an angle of about 15 degrees with respect to the disk midplane.
Furthermore, we show that the spatial and spectral sensitivity of these data
can distinguish between models that have sub-Keplerian gas velocities due to
the vertical extent of the disk and its associated radial pressure gradient (a
fractional difference in the bulk gas velocity field of approximately greater
than 5%).


title:
Reconnection at 3D Magnetic Null Points: Effect of Current Sheet
  Asymmetry

abstract:
  Asymmetric current sheets are likely to be prevalent in both astrophysical
and laboratory plasmas with complex three dimensional (3D) magnetic topologies.
This work presents kinematic analytical models for spine and fan reconnection
at a symmetric 3D null with asymmetric current sheets. Asymmetric fan
reconnection is characterized by an asymmetric reconnection of flux past each
spine line and a bulk flow of plasma across the null point. In contrast,
asymmetric spine reconnection is inherently equal and opposite in how flux is
reconnected across the fan plane. The higher modes of spine reconnection also
include localized wedges of vortical flux transport in each half of the fan. In
this situation, two definitions for reconnection rate become appropriate: a
local reconnection rate quantifying how much flux is genuinely reconnected
across the fan plane and a global rate associated with the net flux driven
across each semi-plane. Through a scaling analysis it is shown that when the
ohmic dissipation in the layer is assumed to be constant, the increase in the
local rate bleeds from the global rate as the sheet deformation is increased.
Both models suggest that asymmetry in the current sheet dimensions will have a
profound effect on the reconnection rate and manner of flux transport in
reconnection involving 3D nulls.


title:
Room temperature operational single electron transistor on the
  macroscopic surface of hydrogenated diamond like carbon

abstract:
  This paper shows single electron transistor at room temperature,created on
macroscopic system-the two-dimensional large area surface of our hydrogenated
diamond like carbon thin film. Our results, free from the limitation of
lowering the size of coulomb blockade in sub-nanometer range with the existing
unprofitable process,are consistent with the theoretical results and will be
relevant for future practical applications in the realm of atomic physics,
quantum phenomenon and metrology.


title:
Charge transport through interfaces: a tight-binding toy model and its
  implications

abstract:
  With the help of a tight-binding (TB) electronic-structure toy model we
investigate the matching of parameters across hetero-interfaces . We
demonstrate that the virtual crystal approximation, commonly employed for this
purpose, may not respect underlying symmetries of the electronic structure. As
an alternative approach we propose a method which is motivated by the matching
of wave functions in continuous-space quantum mechanics. We show that this
method obeys the required symmetries and can be applied in simple band to band
transitions. Extension to multiple interfaces and to more sophisticated TB
models is discussed.


title:
Dynamic Predictions with Time-Dependent Covariates in Survival Analysis
  using Joint Modeling and Landmarking

abstract:
  A key question in clinical practice is accurate prediction of patient
prognosis. To this end, nowadays, physicians have at their disposal a variety
of tests and biomarkers to aid them in optimizing medical care. These tests are
often performed on a regular basis in order to closely follow the progression
of the disease. In this setting it is of medical interest to optimally utilize
the recorded information and provide medically-relevant summary measures, such
as survival probabilities, that will aid in decision making. In this work we
present and compare two statistical techniques that provide dynamically-updated
estimates of survival probabilities, namely landmark analysis and joint models
for longitudinal and time-to-event data. Special attention is given to the
functional form linking the longitudinal and event time processes, and to
measures of discrimination and calibration in the context of dynamic
prediction.


title: Correlation effects in multiple hard scattering

abstract:
  Correlations between the incoming partons in multiple hard scattering can
affect both the event rate and kinematic distributions in the final state. In
this talk, I discuss different types of correlations relevant for double parton
scattering in proton-proton collisions.


title:
Pressure phase diagram and quantum criticality of CePt2In7 single
  crystals

abstract:
  We report the temperature-pressure (T-P) phase diagram of CePt2In7 single
crystals, especially the pressure evolution of the antiferromagnetic order and
the emergence of superconductivity, which have been studied by electrical
resistivity and ac calorimetry under nearly hydrostatic environments. Compared
with its polycrystalline counterpart, bulk superconductivity coexists with
antiferromagnetism in a much narrower pressure region. The possible existence
of textured superconductivity and local quantum criticality also are observed
in CePt2In7, exhibiting a remarkable similarity with CeRhIn5.


title: Traffic data reconstruction based on Markov random field modeling

abstract:
  We consider the traffic data reconstruction problem. Suppose we have the
traffic data of an entire city that are incomplete because some road data are
unobserved. The problem is to reconstruct the unobserved parts of the data. In
this paper, we propose a new method to reconstruct incomplete traffic data
collected from various traffic sensors. Our approach is based on Markov random
field modeling of road traffic. The reconstruction is achieved by using
mean-field method and a machine learning method. We numerically verify the
performance of our method using realistic simulated traffic data for the real
road network of Sendai, Japan.


title: Valence transversities: the collinear extraction

abstract:
  In these proceedings, we propose an extraction of the valence transversity
parton distributions. Based on an analysis of pion-pair production in
deep-inelastic scattering off transversely polarized targets, this extraction
of transversity is performed in the framework of collinear factorization. The
recently released data for proton and deuteron targets at HERMES and COMPASS
allow for a flavor separation of the valence transversities, for which we give
a complete statistical study.


title: Superconductivity in Topological Insulator Sb2Te3 Induced by Pressure

abstract:
  Topological superconductivity is one of most fascinating properties of
topological quantum matters that was theoretically proposed and can support
Majorana Fermions at the edge state. Superconductivity was previously realized
in a Cu-intercalated Bi2Se3 topological compound or a Bi2Te3 topological
compound at high pressure. Here we report the discovery of superconductivity in
the topological compound Sb2Te3 when pressure was applied. The crystal
structure analysis results reveal that superconductivity at a low-pressure
range occurs at the ambient phase. The Hall coefficient measurements indicate
the change of p-type carriers at a low-pressure range within the ambient phase,
into n-type at higher pressures, showing intimate relation to superconducting
transition temperature. The first principle calculations based on experimental
measurements of the crystal lattice show that Sb2Te3 retains its Dirac surface
states within the low-pressure ambient phase where superconductivity was
observed, which indicates a strong relationship between superconductivity and
topology nature.


title:
On the structure of metal plasticity constitutive equations and the
  physical origin of the plastic spin

abstract:
  The macroscopic elastic-plastic response of a metal polycrystal is analyzed
here by homogenizing the response of a representative volume element. With this
purpose, the theory developed in Hill(1967)(The essential structure of
constitutive laws for metal composites and polycrystals. J. Mech. Phys. Solids,
15, 79-95) is extended so that the structural changes caused by plastic
deformation are taken into account. It is found that the type of evolution
assigned to the slip systems of a constituent crystal influences significantly
the structure of the constitutive system characterizing the overall response.
In particular, the classical normality structure is obtained only if slip
systems are assumed to convect with the crystal lattice. Any other type of slip
system evolution induces a deviation of the macro-rate of plastic deformation
from the exterior normal to the yield surface. This provides a physical
explanation and also a rigorous definition for the much debated concept of
plastic spin.


title: Trapped surfaces in Oppenheimer-Snyder black holes

abstract:
  The Oppenheimer-Snyder solution models a homogeneous round dust cloud
collapsing to a black hole. Inside its event horizon there is a region through
which trapped surfaces pass. We try to determine exactly where the boundary of
this region meets the centre of the cloud. We present explicit examples of the
relevant trapped (topological) spheres; they extend into the exterior vacuum
region, and are carefully matched at the junction between the cloud and the
vacuum.


title: Frequency Doubling Nanocrystals for Cancer Theranostics

abstract:
  A novel bio-photonics approach based on the nonlinear optical process of
second harmonic generation by non-centrosymmetric nanoparticles is presented
and demonstrated on malignant human cell lines. The proposed method allows to
directly interact with DNA in absence of photosensitizing molecules, to enable
independent imaging and therapeutic modalities switching between the two modes
of operation by simply tuning the excitation laser wavelength, and to avoid any
risk of spontaneous activation by any natural or artificial light source.


title:
Stabilization of the multiferroic spin cycloid in Ni$_3$V$_2$O$_8$ by
  light Co-doping

abstract:
  We present macroscopic and neutron diffraction data on multiferroic lightly
Co-doped Ni$_3$V$_2$O$_8$. Doping Co into the parent compound suppresses the
sequence of four magnetic phase transitions and only two magnetically ordered
phases, the paraelectric high temperature incommensurate (HTI) and
ferroelectric low temperature incommensurate (LTI), can be observed.
Interestingly, the LTI multiferroic phase with a spiral (cycloidal) magnetic
structure is stabilized down to at least 1.8 K, which could be revealed by
measurements of the electric polarization and confirmed by neutron diffraction
on single crystal samples. The extracted magnetic moments of the LTI phase
contain besides the main exchange also fine components of the cycloid allowed
by symmetry which result in a small amplitude variation of the magnetic moments
along the cycloid propagation due to the site-dependent symmetry properties of
the mixed representations. In the HTI phase a finite imaginary part of the
spine magnetic moment could be deduced yielding a spin cycloid instead of a
purely sinusoidal structure with an opposite spin chirality for different spine
spin chains. The magnetic ordering of the cross-tie sites in both phases is
different in comparison to the respective ones in the pure Ni compound. A wider
temperature stability range of the HTI phase has been observed in comparison to
Ni$_3$V$_2$O$_8$ which can be explained by an additional single-ion easy-axis
anisotropy due to Co-doping. The larger incommensurability of the Co-doped
compounds yields a larger ratio between the competing next-nearest neighbour
and nearest neighbour interaction, which is $J_2/J_1$=0.43 (0.47) for a doping
level of 7% (10%) Co compared to 0.39 in the parent compound.


title:
A Fuzzy Topsis Multiple-Attribute Decision Making for Scholarship
  Selection

abstract:
  As the education fees are becoming more expensive, more students apply for
scholarships. Consequently, hundreds and even thousands of applications need to
be handled by the sponsor. To solve the problems, some alternatives based on
several attributes (criteria) need to be selected. In order to make a decision
on such fuzzy problems, Fuzzy Multiple Attribute Decision Making (FMDAM) can be
applied. In this study, Unified Modeling Language (UML) in FMADM with TOPSIS
and Weighted Product (WP) methods is applied to select the candidates for
academic and non-academic scholarships at Universitas Islam Negeri Sunan
Kalijaga. Data used were a crisp and fuzzy data. The results show that TOPSIS
and Weighted Product FMADM methods can be used to select the most suitable
candidates to receive the scholarships since the preference values applied in
this method can show applicants with the highest eligibility


title:
The radial distribution of X-ray Binaries and Globular Clusters in NGC
  4649 and their relation with the local stellar mass density

abstract:
  We investigate the radial distribution of the low-mass X-ray binary (LMXB)
population in the elliptical galaxy NGC 4649, using Chandra and Hubble data to
separate the field and globular cluster (GC) populations. GCs with LMXBs have
the same radial distribution as the parent red and blue GCs. The radial profile
of field LMXBs follows the V-band profile within the D25 of NGC 4649. Using the
spatial information provided by our data, we find that the global galaxy-wide
relations between cumulative number and luminosity of LMXBs and the integrated
stellar mass hold on local scales within D25. An excess of field LMXBs with
respect to the V-light is observed in the galaxy's outskirt, which may be
partially due to unidentified GC sources or to a rejuvenated field LMXB
population caused by past merging interactions.


title:
Magnetic field symmetries of nonlinear transport with elastic and
  inelastic scattering

abstract:
  We study nonlinear electronic transport symmetries in Aharonov-Bohm
interferometers subjected to inelastic scattering effects and show that odd
(even) conductance terms are even (odd) in the magnetic field when the junction
is (left-right) spatially symmetric. This observation does not hold when an
asymmetry is introduced, as we show numerically, but odd conductance terms only
manifest a weak breakdown of the magnetic field symmetry. Under elastic
dephasing effects, the Onsager-Casimir symmetry is maintained beyond linear
response and under spatial asymmetries.


title: New results on systems of generalized vector quasi-equilibrium problems

abstract:
  In this paper, we firstly prove the existence of the equilibrium for the
generalized abstract economy. We apply these results to show the existence of
solutions for systems of vector quasi-equilibrium problems with multivalued
trifunctions. Secondly, we consider the generalized strong vector
quasi-equilibrium problems and study the existence of their solutions in the
case when the correspondences are weakly naturally quasi-concave or weakly
biconvex and also in the case of weak-continuity assumptions. In all
situations, fixed-point theorems are used.


title:
Minimally flavored colored scalar in $\bar B \to D^{(*)} \tau \bar \nu$
  and the mass matrices constraints

abstract:
  The presence of a colored scalar that is a weak doublet with fractional
electric charges of $|Q|=2/3$ and $|Q|=5/3$ with mass below 1,TeV can provide
an explanation of the observed branching ratios in $B \to D^{(*)} \tau \bar
\nu$ decays. The required combination of scalar and tensor operators in the
effective Hamiltonian for $b \to c \tau \bar \nu$ is generated through the
$t$-channel exchange. We focus on a scenario with a minimal set of Yukawa
couplings that can address a semitauonic puzzle and show that its resolution
puts a nontrivial bound on the product of the scalar couplings to $\bar \tau b$
and $\bar c \nu$. We also derive additional constraints posed by $Z \to b\bar
b$, muon magnetic moment, lepton flavor violating decays $\mu \to e \gamma$,
$\tau \to \mu \gamma$, $\tau \to e \gamma$, and $\tau$ electric dipole moment.
The minimal set of Yukawa couplings is not only compatible with the mass
generation in an SU(5) unification framework, a natural environment for colored
scalars, but specifies all matter mixing parameters except for one angle in the
up-type quark sector. We accordingly spell out predictions for the proton decay
signatures through gauge boson exchange and show that $p \rightarrow \pi^0 e^+$
is suppressed with respect to $p \rightarrow K^+ \bar{\nu}$ and even $p
\rightarrow K^0 e^+$ in some parts of available parameter space. Impact of the
colored scalar embedding in 45-dimensional representation of SU(5) on
low-energy phenomenology is also presented. Finally, we make predictions for
rare top and charm decays where presence of this scalar can be tested
independently.


title: The LSND and MiniBooNE Oscillation Searches at High $\Delta m^2$

abstract:
  This paper reviews the results of the LSND and MiniBooNE experiments. The
primary goal of each experiment was to effect sensitive searches for neutrino
oscillations in the mass region with $\Delta m^2 \sim 1$ eV$^2$. The two
experiments are complementary, and so the comparison of results can bring
additional information with respect to models with sterile neutrinos. Both
experiments obtained evidence for $\bar \nu_\mu \rightarrow \bar \nu_e$
oscillations, and MiniBooNE also observed a $\nu_\mu \rightarrow \nu_e$ excess.
In this paper, we review the design, analysis, and results from these
experiments. We then consider the results within the global context of sterile
neutrino oscillation models. The final data sets require a more extended model
than the simple single sterile neutrino model imagined at the time that LSND
drew to a close and MiniBooNE began. We show that there are apparent
incompatibilities between data sets in models with two sterile neutrinos.
However, these incompatibilities may be explained with variations within the
systematic error. Overall, models with two (or three) sterile neutrinos seem to
succeed in fitting the global data, and they make interesting predictions for
future experiments.


title: Orbital angular momentum entanglement in turbulence

abstract:
  The turbulence induced decay of orbital angular momentum (OAM) entanglement
between two photons is investigated numerically and experimentally. To compare
our results with previous work, we simulate the turbulent atmosphere with a
single phase screen based on the Kolmogorov theory of turbulence. We consider
two different scenarios: in the first only one of the two photons propagates
through turbulence, and in the second both photons propagate through
uncorrelated turbulence. Comparing the entanglement evolution for different OAM
values, we found the entanglement to be more robust in turbulence for higher
OAM values. We derive an empirical formula for the distance scale at which
entanglement decays in term of the scale parameters and the OAM value.


title:
Brighter galaxy bias: underestimating the velocity dispersions of galaxy
  clusters

abstract:
  We study the systematic bias introduced when selecting the spectroscopic
redshifts of brighter cluster galaxies to estimate the velocity dispersion of
galaxy clusters from both simulated and observational galaxy catalogues. We
select clusters with Ngal > 50 at five low redshift snapshots from a
semi-analytic model galaxy catalogue, and from a catalogue of SDSS DR8 groups
and clusters across the redshift range 0.021<z<0.098. We employ various
selection techniques to explore whether the velocity dispersion bias is simply
due to a lack of dynamical information or is the result of an underlying
physical process occurring in the cluster, for example, dynamical friction. The
velocity dispersions and stacked particle velocity distributions of the parent
dark matter (DM) halos are compared to the corresponding cluster dispersions
and galaxy velocity distribution. We find a clear bias between the halo and the
semi-analytic galaxy cluster velocity dispersion on the order of sigma gal /
sigma DM = 0.87-0.95 and a distinct difference in the stacked galaxy and DM
particle velocity distribution. We identify a systematic underestimation of the
velocity dispersions when imposing increasing absolute I-band magnitude limits.
This underestimation is enhanced when using only the brighter cluster members
for dynamical analysis on the order of 5-35%, indicating that dynamical
friction is a serious source of bias when using galaxy velocities as tracers of
the underlying gravitational potential. In contrast to the literature we find
that the resulting bias is not only halo mass-dependent but that the nature of
the dependence changes according to the galaxy selection strategy. We make a
recommendation that, in the realistic case of limited availability of spectral
observations, a strictly magnitude-limited sample should be avoided to ensure
an unbiased estimate of the velocity dispersion.


title:
Hyperbolic and Elliptic Transport Barriers in Three-Dimensional Unsteady
  Flows

abstract:
  We develop a general theory of transport barriers for three-dimensional
unsteady flows with arbitrary time-dependence. The barriers are obtained as
two-dimensional Lagrangian Coherent Structures (LCSs) that create locally
maximal deformation. Along hyperbolic LCSs, this deformation is induced by
locally maximal normal repulsion or attraction. Along shear LCSs, the
deformation is created by locally maximal tangential shear. Hyperbolic LCSs,
therefore, play the role of generalized stable and unstable manifolds, while
closed shear LCSs (elliptic LCSs) act as generalized KAM tori or KAM-type
cylinders. All these barriers can be computed from our theory as explicitly
parametrized surfaces. We illustrate our results by visualizing two-dimensional
hyperbolic and elliptic barriers in steady and unsteady versions of the ABC
flow.

categories: math.DS nlin.CD physics.ao-ph physics.flu-dyn


title: Isolating Prompt Photons with Narrow Cones

abstract:
  We discuss the isolation of prompt photons in hadronic collisions by means of
narrow isolation cones and the QCD computation of the corresponding cross
sections. We reconsider the occurence of large perturbative terms with
logarithmic dependence on the cone size and their impact on the fragmentation
scale dependence. We cure the apparent perturbative violation of unitarity for
small cone sizes, which had been noticed earlier in next-to-leading-order (NLO)
calculations, by resumming the leading logarithmic dependence on the cone size.
We discuss possible implications regarding the implementation of some hollow
cone variants of the cone criterion, which simulate the experimental difficulty
to impose isolation inside the region filled by the electromagnetic shower that
develops in the calorimeter.


title:
Divertor heat fluxes and profiles during mitigated and unmitigated Edge
  Localised Modes (ELMs) on the Mega Amp Spherical Tokamak (MAST)

abstract:
  Edge localised modes (ELMs) are a concern for future devices as they can
limit the operational lifetime of the divertor. The mitigation of ELMs can be
performed by the application of resonant magnetic perturbations (RMPs) which
act to degrade the pressure gradient in the edge of the plasma. Investigations
of the effect of RMPs on MAST have been performed in a range of plasmas using
perturbations with toroidal mode numbers of n=3, 4 and 6. It has been seen that
the RMPs increase the ELM frequency, which gives rise to a corresponding
decrease in the ELM energy. The reduced ELM energy decreases the peak heat flux
to the divertor, with a three fold reduction in the ELM energy, generating a
1.5 fold reduction in the peak heat flux. Measurements of the divertor heat
flux profile show evidence of strike point splitting consistent with modelling
using the vacuum code ERGOS.


title: Tracer diffusion at low temperature in kinetically constrained models

abstract:
  We describe the motion of a tracer in an environment given by a kinetically
constrained spin model (KCSM) at equilibrium. We check convergence of its
trajectory properly rescaled to a Brownian motion and positivity of the
diffusion coefficient $D$ as soon as the spectral gap of the environment is
positive (which coincides with the ergodicity region under general conditions).
Then we study the asymptotic behavior of $D$ when the density $1-q$ of the
environment goes to $1$ in two classes of KCSM. For noncooperative models, the
diffusion coefficient $D$ scales like a power of $q$, with an exponent that we
compute explicitly. In the case of the Fredrickson-Andersen one-spin
facilitated model, this proves a prediction made in Jung, Garrahan and Chandler
[Phys. Rev. E 69 (2004) 061205]. For the East model, instead we prove that the
diffusion coefficient is comparable to the spectral gap, which goes to zero
faster than any power of $q$. This result contradicts the prediction of
physicists (Jung, Garrahan and Chandler [Phys. Rev. E 69 (2004) 061205; J.
Chem. Phys. 123 (2005) 084509]), based on numerical simulations, that suggested
$D\sim \operatorname {gap}^{\xi}$ with $\xi<1$.

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


title: The peculiar Raychaudhuri equation

abstract:
  Peculiar motions are commonplace in the universe. Our local group of
galaxies, for example, drifts relative to the Hubble flow at about 600 km/sec.
Such bulk flows are believed to fade away as we move on to progressively larger
scales. Recently, however, there have been reports of peculiar motions larger
and faster than typically expected. If these claims are correct, the role of
peculiar flows in shaping the kinematics of our universe has been probably
underestimated. Here, we use general relativistic techniques to analyse the
average kinematics of large-scale bulk motions and compute the nonlinear
Raychaudhuri equation of such flows. In doing so, we introduce two families of
observers. One at rest with the Hubble expansion and another following the
peculiar motion. We first derive the fully nonlinear expressions of the
"peculiar" Raychaudhuri equation in both frames and identify a range of
relative motion effects. Linearised around a Friedmann universe with
pressureless dust, the full equations reduce to a simple relation with no
explicit contribution from the matter component of the universe. Using
cosmological perturbation theory, we obtain a scale-dependent formula, which
also incorporates the effects of universe's inhomogeneity and anisotropy. When
the latter are secondary, the peculiar Raychaudhuri equation can be solved
analytically. Also, combining the resulting expression with data from recent
peculiar-velocity surveys, we estimate the relative deceleration/acceleration
rates of such bulk motions.


title: Lipschitz homotopy and density of Lipschitz mappings in Sobolev spaces

abstract:
  We construct a smooth compact n-dimensional manifold Y with one point
singularity such that all its Lipschitz homotopy groups are trivial, but
Lipschitz mappings Lip(S^n,Y) are not dense in the Sobolev space
W^{1,n}(S^n,Y). On the other hand we show that if a metric space Y is Lipschitz
(n-1)-connected, then Lipschitz mappings Lip(X,Y) are dense in N^{1,p}(X,Y)
whenever the Nagata dimension of X is bounded by n and the space X supports the
p-Poincare inequality.


title: Sobolev spaces, Lebesgue points and maximal functions

abstract:
  In this note we study boundedness of a large class of maximal operators in
Sobolev spaces that includes the spherical maximal operator. We also study the
size of the set of Lebesgue points with respect to convergence associated with
such maximal operators.


title: Entanglement estimation from Bell inequality violation

abstract:
  It is well known that the violation of Bell's inequality in the form given by
Clauser, Horne, Shimony, and Holt (CHSH) in two-qubit systems requires
entanglement, but not vice versa, i.e., there are entangled states which do not
violate the CHSH inequality. Here we compare some standard entanglement
measures with violations of the CHSH inequality (as given by the Horodecki
measure) for two-qubit states generated by Monte Carlo simulations. We describe
states that have extremal entanglement according to the negativity,
concurrence, and relative entropy of entanglement for a given value of the CHSH
violation. We explicitly find these extremal states by applying the generalized
method of Lagrange multipliers based on the Karush-Kuhn-Tucker conditions. The
found minimal and maximal states define the range of entanglement accessible
for any two-qubit states that violate the CHSH inequality by the same amount.
We also find extremal states for the concurrence versus negativity by
considering only such states which do not violate the CHSH inequality.
Furthermore, we describe an experimentally efficient linear-optical method to
determine the highest Horodecki degree of the CHSH violation for arbitrary
mixed states of two polarization qubits. By assuming to have access
simultaneously to two copies of the states, our method requires only six
discrete measurement settings instead of nine settings, which are usually
considered.


title: Ion energy measurements on MAST using a midplane RFEA

abstract:
  Ion energy measurements have been made in the scrape off layer of the Mega
Amp Spherical Tokamak (MAST) using a midplane retarding field energy analyser
(RFEA) in H-mode plasmas during the inter-edge localised mode (ELM) period and
during type I and type III ELMs. During the inter-ELM period at distances of 3
to 8 cm from the last closed flux surface (LCFS), ion temperatures of 20 to 70
eV have been measured giving an ion to electron temperature ratio of 2 to 7
with a mean of 4. During type III ELMs, an ion temperature of 50 eV has been
measured 3 to 6 cm from the LCFS which decreases to 30 eV at distances 11 to 16
cm from the LCFS. During type I ELMs, an ion temperature of 40 eV has been
measured at a distance of 10 to 15 cm from the LCFS.


title:
The Galactic NH - AV Relation and its Application to Historical Galactic
  SNRs

abstract:
  We refine a classic relation between the hydrogen column density (NH) and
optical extinction (Av) by employing 39 Galactic Supernova Remnants (SNRs) with
X-rays, optical and/or infra-red data available. We find NH =
(1.69+/-0.07)*10^21 Av cm^(-2) mag^(-1) . Applying this relation to three
Galactic SNRs with good historical records allows us to further constrain
either their progenitor's distances or magnitudes, which is independent access
to their distances.


title:
Comparison of fractional wave equations for power law attenuation in
  ultrasound and elastography

abstract:
  A set of wave equations with fractional loss operators in time and space are
analyzed. It is shown that the fractional Szabo equation, the power law wave
equation, and the fractional Laplacian wave equation in the causal and
non-causal forms all are low frequency approximations of the fractional
Kelvin-Voigt wave equation and the more general fractional Zener wave equation.
  The latter two equations are based on fractional constitutive equations while
the former wave equations are ad hoc, heuristic equations. We show that this
has consequences for use in modelling and simulation especially for
applications that do not satisfy the low frequency approximation, such as shear
wave elastography. In such applications the wave equations based on
constitutive equations are the preferred ones.


title: An asymptotic safety scenario for gauged chiral Higgs-Yukawa models

abstract:
  We investigate chiral Higgs-Yukawa models with a non-abelian gauged
left-handed sector reminiscent to a sub-sector of the standard model. We
discover a new weak-coupling fixed-point behavior that allows for ultraviolet
complete RG trajectories which can be connected with a conventional long-range
infrared behavior in the Higgs phase. This non-trivial ultraviolet behavior is
characterized by asymptotic freedom in all interaction couplings, but a quasi
conformal behavior in all mass-like parameters. The stable microscopic scalar
potential asymptotically approaches flatness in the ultraviolet, however, with
a non-vanishing minimum increasing inversely proportional to the asymptotically
free gauge coupling. This gives rise to nonperturbative -- though weak-coupling
-- threshold effects which induce ultraviolet stability along a line of fixed
points. Despite the weak-coupling properties, the system exhibits non-Gaussian
features which are distinctly different from its standard perturbative
counterpart: e.g., on a branch of the line of fixed points, we find linear
instead of quadratically running renormalization constants. Whereas the Fermi
constant and the top mass are naturally of the same order of magnitude, our
model generically allows for light Higgs boson masses. Realistic mass ratios
are related to particular RG trajectories with a "walking" mid-momentum regime.


title: 78 Pairs of Possible PSR-SNR Associations

abstract:
  We discuss the criteria to associate PSRs with SNRs, and summary 78 pairs of
possible PSR-SNR associations which is the most complete sample so far. We
refine them into three categories according to degree of reliability. Statistic
study on PSR-SNR associations helps us understand massive star evolution and
constrain pulsar's theory models.


title: Multi-Structural Signal Recovery for Biomedical Compressive Sensing

abstract:
  Compressive sensing has shown significant promise in biomedical fields. It
reconstructs a signal from sub-Nyquist random linear measurements. Classical
methods only exploit the sparsity in one domain. A lot of biomedical signals
have additional structures, such as multi-sparsity in different domains,
piecewise smoothness, low rank, etc. We propose a framework to exploit all the
available structure information. A new convex programming problem is generated
with multiple convex structure-inducing constraints and the linear measurement
fitting constraint. With additional a priori information for solving the
underdetermined system, the signal recovery performance can be improved. In
numerical experiments, we compare the proposed method with classical methods.
Both simulated data and real-life biomedical data are used. Results show that
the newly proposed method achieves better reconstruction accuracy performance
in term of both L1 and L2 errors.


title: Generalized Fibonacci polynomials and Fibonomial coefficients

abstract:
  The focus of this paper is the study of generalized Fibonacci polynomials and
Fibonomial coefficients. The former are polynomials {n} in variables s and t
given by {0} = 0, {1} = 1, and {n} = s{n-1}+t{n-2} for n ge 2. The latter are
defined by {n choose k} = {n}!/({k}!{n-k}!) where {n}! = {1}{2}...{n}. These
quotients are also polynomials in s and t, and specializations give the
ordinary binomial coefficients, the Fibonomial coefficients, and the q-binomial
coefficients. We present some of their fundamental properties, including a more
general recursion for {n}, an analogue of the binomial theorem, a new proof of
the Euler-Cassini identity in this setting with applications to estimation of
tails of series, and valuations when s and t take on integral values. We also
study a corresponding analogue of the Catalan numbers. Conjectures and open
problems are scattered throughout the paper.


title:
Characterizations of Bounded Ricci Curvature on Smooth and NonSmooth
  Spaces

abstract:
  There are two primary goals to this paper. In the first part of the paper we
study smooth metric measure spaces (M^n,g,e^{-f}dv_g) and give several ways of
characterizing bounds -Kg\leq \Ric+\nabla^2f\leq Kg on the Ricci curvature of
the manifold. In particular, we see how bounded Ricci curvature on M controls
the analysis of path space P(M) in a manner analogous to how lower Ricci
curvature controls the analysis on M. In the second part of the paper we
develop the analytic tools needed to in order to use these new
characterizations to give a definition of bounded Ricci curvature on general
metric measure spaces (X,d,m). We show that on such spaces many of the
properties of smooth spaces with bounded Ricci curvature continue to hold on
metric-measure spaces with bounded Ricci curvature.


title: Universality of TMD distribution functions

abstract:
  We introduce transverse momentum dependent parton distribution functions
(TMDs) for gluons with definite rank. The rank refers to the azimuthal
dependence corresponding to the tensorial structure in transverse momenta
multiplying universal functions only depending on $x$ and $p_T^2$. In this way
only a finite number of functions of definite rank remains for a target with
the maximal rank depending on its spin. Gauge links, required for color gauge
invariance, enter in the explicit description of the matrix elements
corresponding to these TMDs and account for their process dependence. In this
way a general gauge link dependent function is expressed in the universal set,
where all process (i.e. gauge link) dependence is isolated in gluonic pole
factors multiplying the universal TMDs of definite rank.


title: The Mirage of the Fermi Scale

abstract:
  The discovery of a light Higgs boson at LHC may be suggesting that we need to
revise our model building paradigms to understand the origin of the weak scale.
We explore the possibility that the Fermi scale is not fundamental but rather a
derived one, i.e. a low energy mirage. We show that this scenario emerges in a
very natural way in models previously used to break the electroweak symmetry
dynamically and suggest a simple dynamical framework for this idea. In our
model the electroweak scale results from the interplay between two very high
energy scales, one typically of the order of $\Luv\sim 10^{10}$ GeV and the
other around $M_{\rm U} \sim 10^{16}$ GeV, although other values are also
possible.


title: Parton momentum and helicity distributions in the nucleon

abstract:
  We review the current status of spin-averaged and spin-dependent parton
distribution functions (PDFs) of the nucleon. After presenting the formalism
used to fit PDFs in modern global data analyses, we discuss constraints placed
on the PDFs by specific data types. We give representative examples of
unpolarized and polarized PDFs and their errors, and list open questions in
global QCD fitting. Finally, we anticipate how future facilities, with
fixed-target and collider experiments, may impact our knowledge of PDFs and
reduce their uncertainties.


title:
Electron acceleration by coherent laser pulse echelons in periodic
  plasma structures

abstract:
  We consider a possibilty to use an echelon of mutually coherent laser pulses
generated by the emerging CAN (Coherent Amplification Network) technology for
direct particle acceleration in periodic plasma structures. The plasma
structure survives a single shot only. However, due to it's simplicity and
projected very low production costs, the structure can be replaced for every
laser shot at a kiloherz repetition rate. We discuss resonant and free
streaming configurations. The resonant plasma structures can trap energy of
longer laser pulses but are limited to moderate laser intensities of about
10^{14}\,{\rm W/cm^{2}} and are very sensitive to the structure quality. The
free streaming configurations can survive laser intensities above 10^{18}\,{\rm
W/cm^{2}} for several tens of femtoseconds so that sustained accelerating rates
well above {\rm TeV/m} are feasible. In our full electromagnetic relativistic
particle-in-cell (PIC) simulations we show a test electron bunch gaining up to
120\,{\rm GeV} over a distance of 5.3\,{\rm cm} only.


title:
The Forgotten Quantum Number: A short note on the radial modes of
  Laguerre-Gauss beams

abstract:
  The orbital angular momentum quantum number of Laguerre-Gauss beams has
received an explosively increasing amount of attention over the past twenty
years. However, often overlooked is the so-called radial number of these beams.
We present a derivation of the differential operator formalism of this
"forgotten" quantum number. We then draw some connections between this new
formalism and the effect the radial number has on beam stability with possible
application to quantum communication. We also briefly outline how the radial
number is tied to other physical aspects of the beam (such as the Gouy phase,
and radial confinement). These do not necessarily constitute finished results,
but are instead meant to stimulate discussion of this interesting and often
overlooked physical parameter.


title:
Cosmological constraints on axionic dark radiation from axion-photon
  conversion in the early Universe

abstract:
  Axions seem ubiquitous in string theories and some of them may be produced
non-thermally by heavy scalar decays, contributing to dark radiation. We study
various cosmological effects of photons produced from the axionic dark
radiation through axion-photon conversion in the presence of primordial
magnetic fields, and derive tight constraints on the combination of the
axion-photon coupling and the primordial magnetic field.


title:
Construction of KMS States in Perturbative QFT and Renormalized
  Hamiltonian Dynamics

abstract:
  We present a general construction of KMS states in the framework of
perturbative algebraic quantum field theory (pAQFT). Our approach may be
understood as an extension of the Schwinger-Keldysh formalism. We obtain in
particular the Wightman functions at positive temperature, thus solving a
problem posed some time ago by Steinmann. The notorious infrared divergences
observed in a diagrammatic expansion are shown to be absent due to a consequent
exploitation of the locality properties of pAQFT. To this avail, we introduce a
novel, Hamiltonian description of the interacting dynamics and find, in
particular, a precise relation between relativistic QFT and rigorous quantum
statistical mechanics.


title: HD45314: a new gamma Cas analog among Oe stars

abstract:
  Oe stars possibly form an extension to higher temperatures of the Be
phenomenon, but it is still unclear whether these stars have disks. X-ray
spectra could provide hints for interactions of the star with a putative
surrounding disk. We obtained XMM-Newton observations of two Oe stars, HD45314
and HD60848. Spectra and light curves were extracted and analysed. Optical
spectra were also obtained to support the X-ray observations. We find that both
stars display very different X-ray properties. Whilst HD60848 has an X-ray
spectrum and emission level typical for its spectral type, HD45314 displays a
very hard X-ray emission, dominated by a thermal plasma with kT ~ 21 keV.
Furthermore, HD45314 displays count rate variations by a factor 2 on timescales
of ~ 1000s and a high log(L_X/L_bol) = -6.10 +/- 0.03. The X-ray properties of
HD45314 indicate that this star is a new member of the class of gamma Cas
analogs, the first one among the original category of Oe stars.


title: Quantum billiards in multidimensional models with fields of forms

abstract:
  Bianchi type I cosmological model in (n+1)-dimensional gravity with several
forms is considered. When the electric non-composite brane ansatz is adopted,
the Wheeler-DeWitt (WDW) equation for the model, written in a conformally
covariant form, is analyzed. Under certain restrictions, asymptotic solutions
to the WDW equation near the singularity are found, which reduce the problem to
the so-called quantum billiard on the (n-1)-dimensional Lobachevsky space
H^{n-1}. Two examples of quantum billiards are considered: a 2-dimensional
quantum billiard for a 4D model with three 2-forms and a 9D quantum billiard
for an 11D model with 120 4-forms which mimics SM2-brane sector of D=11
supergravity. For certain solutions, vanishing of the wave function at the
singularity is proved.


title:
Quantum computing through electron propagation in the edge states of
  quantum spin Hall systems

abstract:
  We propose to implement quantum computing based on electronic spin qubits by
controlling the propagation of the electron wave packets through the helical
edge states of quantum spin Hall systems (QSHs). Specfically, two
non-commutative single-qubit gates, which rotate a qubit around z and y axes,
can be realized by utilizing gate voltages either on a single QSH edge channel
or on a quantum point contact structure. The more challenging two-qubit
controlled phase gate can be implemented through the on-demand capacitive
Coulomb interaction between two adjacent edge channels from two parallel QSHs.
As a result, a universal set of quantum gates can be achieved in an
all-electrical way. The fidelity and purity of the two-qubit gate are
calculated with both time delay and finite width of the wave packets taken into
consideration, which can reach high values with the existing high-quality
single electron source.


title: An observation on n-permutability

abstract:
  We prove that in a regular category all reflexive and transitive relations
are symmetric if and only if every internal category is an internal groupoid.
In particular, these conditions hold when the category is n-permutable for some
n.


title:
On Relativistic Entanglement and Localization of Particles and on their
  Comparison with the Non-Relativistic Theory

abstract:
  We make a critical comparison of relativistic and non-relativistic classical
and quantum mechanics of particles in inertial frames and of the open problems
in particle localization at the two levels. The solution of the problems of the
relativistic center of mass, of the clock synchronization convention needed to
define relativistic 3-spaces and of the elimination of the relative times in
the relativistic bound states leads to a description with a decoupled non-local
(non-measurable) relativistic center of mass and with only relative variables
for the particles (single particle subsystems do not exist). We analyze the
implications for entanglement of this relativistic spatial non-separability not
existing in non-relativistic entanglement. Then we try to reconcile the two
visions showing that also at the non-relativistic level in real experiments
only relative variables are measured with their directions determined by the
effective mean classical trajectories of particle beams present in the
experiment. We discuss some of the existing problems with the observers and
their reference frames, leaving to the future the discussion in non-inertial
frames.


title:
Bipartite entanglement-annihilating maps: necessary and sufficient
  conditions

abstract:
  We fully characterize bipartite entanglement-annihilating (EA) channels that
destroy entanglement of any state shared by subsystems and, thus, should be
avoided in any entanglement-enabled experiment. Our approach relies on
extending the problem to EA positive maps, the cone of which remains invariant
under concatenation with partially positive maps. Due to this invariancy,
positive EA maps adopt a well characterization and their intersection with
completely positive trace-preserving maps results in the set of EA channels. In
addition to a general description, we also provide sufficient operational
criteria revealing EA channels. They have a clear physical meaning since the
processes involved contain stages of classical information transfer for
subsystems. We demonstrate the applicability of derived criteria for local and
global depolarizing noises, and specify corresponding noise levels beyond which
any initial state becomes disentangled after passing the channel. The
robustness of some entangled states is discussed.


title: Inference of Field-Sensitive Reachability and Cyclicity

abstract:
  In heap-based languages, knowing that a variable x points to an acyclic data
structure is useful for analyzing termination: this information guarantees that
the depth of the data structure to which x points is greater than the depth of
the structure pointed to by x.fld, and allows bounding the number of iterations
of a loop which traverses the data structure on fld. In general, proving
termination needs acyclicity, unless program-specific or non-automated
reasoning is performed. However, recent work could prove that certain loops
terminate even without inferring acyclicity, because they traverse data
structures "acyclically". Consider a double-linked list: if it is possible to
demonstrate that every cycle involves both the "next" and the "prev" field,
then a traversal on "next" terminates since no cycle will be traversed
completely. This paper develops a static analysis inferring field-sensitive
reachability and cyclicity information, which is more general than existing
approaches. Propositional formulae are computed, which describe which fields
may or may not be traversed by paths in the heap. Consider a tree with edges
"left" and "right" to the left and right sub-trees, and "parent" to the parent
node: termination of a loop traversing leaf-up cannot be guaranteed by
state-of-the-art analyses. Instead, propositional formulae computed by this
analysis indicate that cycles must traverse "parent" and at least one between
"left" and "right": termination is guaranteed as no cycle is traversed
completely. This paper defines the necessary abstract domains and builds an
abstract semantics on them. A prototypical implementation provides the expected
result on relevant examples.


title: Spacetime Singularities: Recent Developments

abstract:
  Recent developments concerning oscillatory spacelike singularities in general
relativity are taking place on two fronts. The first treats generic
singularities in spatially homogeneous cosmology, most notably Bianchi types
VIII and IX. The second deals with generic oscillatory singularities in
inhomogeneous cosmologies, especially those with two commuting spacelike
Killing vectors. This paper describes recent progress in these two areas: in
the spatially homogeneous case focus is on mathematically rigorous results,
while analytical and numerical results concerning generic behavior and
so-called recurring spike formation are the main topic in the inhomogeneous
case. Unifying themes are connections between asymptotic behavior, hierarchical
structures, and solution generating techniques, which provide hints for a link
between the nature of generic singularities and a hierarchy of hidden
asymptotic symmetries.


title: Quasi-pinning and entanglement in the lithium isoelectronic series

abstract:
  The Pauli exclusion principle gives an upper bound of 1 on the natural
occupation numbers. Recently there has been an intriguing amount of theoretical
evidence that there is a plethora of additional generalized Pauli restrictions
or (in)equalities, of kinematic nature, satisfied by these numbers. Here for
the first time a numerical analysis of the nature of such constraints is
effected in real atoms. The inequalities are nearly saturated, or quasi-pinned.
For rank-six and rank-seven approximations for lithium, the deviation from
saturation is smaller than the lowest occupancy number. For a rank-eight
approximation we find well-defined families of saturation conditions.


title:
High confidence AGN candidates among unidentified Fermi-LAT sources via
  statistical classification

abstract:
  The second Fermi-LAT source catalog (2FGL) is the deepest survey of the
gamma-ray sky ever compiled, containing 1873 sources that constitute a very
complete sample down to an energy flux of about 10^(-11) erg cm^(-2) s^(-1).
While counterparts at lower frequencies have been found for a large fraction of
2FGL sources, active galactic nuclei (AGN) being the most numerous class, 576
gamma-ray sources remain unassociated. In these proceedings, we describe a
statistical algorithm that finds candidate AGNs in the sample of unassociated
2FGL sources by identifying targets whose gamma-ray properties resemble those
of known AGNs. Using two complementary learning algorithms and intersecting the
high-probability classifications from both methods, we increase the confidence
of the method and reduce the false-association rate to 11%. Our study finds a
high-confidence sample of 231 AGN candidates among the population of 2FGL
unassociated sources. Selecting sources out of this sample for follow-up
observations or studies of archival data will substantially increase the
probability to identify possible counterparts at other wavelengths.


title: Scalar field theory in the strong self-interaction limit

abstract:
  Standard Model with a classical conformal invariance holds the promise to
give a better understanding of the hierarchy problem and could pave the way for
beyond the standard model physics. So, we give here a mathematical treatment of
a massless quartic scalar field theory with a strong self-coupling both
classically and for quantum field theory. We use a set of classical solutions
recently found and show that there exists an infinite set of infrared trivial
scalar theories with a mass gap. Free particles have superimposed a harmonic
oscillator set of states. The classical solution is displayed through a current
expansion and the next-to-leading order quantum correction is provided.
Application to the Standard Model would entail the existence of higher excited
states of the Higgs particle and reduced decay rates to WW and ZZ that could be
already measured.


title:
Critical analysis of the Bennett-Riedel attack on secure cryptographic
  key distributions via the Kirchhoff-law-Johnson-noise scheme

abstract:
  Recently, Bennett and Riedel (BR) (http://arxiv.org/abs/1303.7435v1) argued
that thermodynamics is not essential in the Kirchhoff-law-Johnson-noise (KLJN)
classical physical cryptographic exchange method in an effort to disprove the
security of the KLJN scheme. They attempted to demonstrate this by introducing
a dissipation-free deterministic key exchange method with two batteries and two
switches. In the present paper, we first show that BR's scheme is unphysical
and that some elements of its assumptions violate basic protocols of secure
communication. All our analyses are based on a technically-unlimited Eve with
infinitely accurate and fast measurements limited only by the laws of physics
and statistics. For non-ideal situations and at active (invasive) attacks, the
uncertainly principle between measurement duration and statistical errors makes
it impossible for Eve to extract the key regardless of the accuracy or speed of
her measurements. To show that thermodynamics and noise are essential for the
security, we crack the BR system with 100% success via passive attacks, in ten
different ways, and demonstrate that the same cracking methods do not function
for the KLJN scheme that employs Johnson noise to provide security underpinned
by the Second Law of Thermodynamics. We also present a critical analysis of
some other claims by BR; for example, we prove that their equations for
describing zero security do not apply to the KLJN scheme. Finally we give
mathematical security proofs for each BR-attack against the KLJN scheme and
conclude that the information theoretic (unconditional) security of the KLJN
method has not been successfully challenged.


title:
Numerical Solutions of Open String Field Theory in Marginally Deformed
  Backgrounds

abstract:
  We investigate numerical solutions of bosonic open string field theory in
some marginally deformed backgrounds, which are obtained by expanding the
action around an identity-based marginal solution with one parameter. We
construct numerical solutions in the Siegel gauge and the Landau gauge
corresponding to the tachyon vacuum. Their vacuum energy approximately cancels
the D-brane tension for larger intervals of the parameter with increasing
truncation level. The result is consistent with the previous expectation that
the identity-based marginal solution has vanishing energy regardless of the
values of the parameter. We also study the marginal branch (M-branch) and the
vacuum branch (V-branch) and evaluate not only the vacuum energy but also the
gauge invariant overlaps with the graviton and the closed tachyon. We observe
that there is a finite bound for the value of the massless field of numerical
solutions even in the marginally deformed background.


title: L\'evy flights in human behavior and cognition

abstract:
  L\'evy flights represent the best strategy to randomly search for a target in
an unknown environment, and have been widely observed in many animal species.
Here, we inspect and discuss recent results concerning human behavior and
cognition. Different studies have shown that human mobility can be described in
terms of L\'evy flights, while fresh evidence indicates that the same pattern
accounts for human mental searches in online gambling sites. Thus, L\'evy
flights emerge as a unifying concept with broad cross-disciplinary
implications. We argue that the ubiquity of such a pattern, both in behavior
and cognition, suggests that the brain regions responsible for this behavior
are likely to be evolutionarily old (i.e. no frontal cortex is involved), and
that fMRI techniques might help to confirm this hypothesis.


title: On Belk's classifying space for Thompson's group F

abstract:
  The space of configurations of n ordered points in the plane serves as a
classifying space for the pure braid group PB_n. Elements of Thompson's group F
admit a model similar to braids, except instead of braiding the strands split
and merge. In Belk's thesis, a space CF was considered, of configurations of
points on the real line allowing for splitting and merging, and a proof was
sketched that CF is a classifying space for F. The idea there was to build the
universal cover and construct an explicit contraction to a point. Here we start
with an established CAT(0) cube complex X on which F acts freely, and construct
an explicit homotopy equivalence between X/F and CF, proving that CF is indeed
a K(F,1).


title: Castelnuovo-Mumford regularity bounds for singular surfaces

abstract:
  We prove the regularity conjecture, namely Eisenbud-Goto conjecture, for a
normal surface with rational, Gorenstein elliptic and log canonical
singularities. Along the way, we bound the regularity for a dimension zero
scheme by its Loewy length and for a curve allowing embedded or isolated point
components by its arithmetic degree.


title: Probing Strongly Coupled Chameleons with Slow Neutrons

abstract:
  We consider different methods to probe chameleons with slow neutrons.
Chameleon modify the potential of bouncing neutrons over a flat mirror in the
terrestrial gravitational field. This induces a shift in the energy levels of
the neutrons which could be detected in current experiments like GRANIT.
Chameleons between parallel plates have a field profile which is bubble-like
and which would modify the phase of neutrons in interferometric experiments. We
show that this new method of detection is competitive with the bouncing neutron
one, hopefully providing an efficient probe of chameleons when strongly coupled
to matter.


title: Semiclassical geons at particle accelerators

abstract:
  We point out that in certain four-dimensional extensions of general
relativity constructed within the Palatini formalism stable self-gravitating
objects with a discrete mass and charge spectrum may exist. The incorporation
of nonlinearities in the electromagnetic field may effectively reduce their
mass spectrum by many orders of magnitude. As a consequence, these objects
could be within (or near) the reach of current particle accelerators. We
provide an exactly solvable model to support this idea.


title: The Brauer group is not a derived invariant

abstract:
  In this short note we observe that the recent examples of derived-equivalent
Calabi-Yau 3-folds with different fundamental groups also have different Brauer
groups, using a little topological K-theory.


title:
Multiscale reverse-time-migration-type imaging using the dyadic
  parabolic decomposition of phase space

abstract:
  We develop a representation of reverse-time migration in terms of Fourier
integral operators the canonical relations of which are graphs. Through the
dyadic parabolic decomposition of phase space, we obtain the solution of the
wave equation with a boundary source and homogeneous initial conditions using
wave packets. On this basis, we develop a numerical procedure for the reverse
time continuation from the boundary of scattering data and for RTM migration.
The algorithms are derived from those we recently developed for the discrete
approximate evaluation of the action of Fourier integral operators and inherit
from their conceptual and numerical properties.


title:
Analytical and numerical analysis of a rotational invariant D=2 harmonic
  oscillator in the light of different noncommutative phase-space
  configurations

abstract:
  In this work we have investigated some properties of classical phase-space
with symplectic structures consistent, at the classical level, with two
noncommutative (NC) algebras: the Doplicher-Fredenhagen-Roberts algebraic
relations and the NC approach which uses an extended Hilbert space with
rotational symmetry. This extended Hilbert space includes the operators
$\theta^{ij}$ and their conjugate momentum $\pi_{ij}$ operators. In this
scenario, the equations of motion for all extended phase-space coordinates with
their corresponding solutions were determined and a rotational invariant NC
Newton's second law was written. As an application, we treated a NC harmonic
oscillator constructed in this extended Hilbert space. We have showed precisely
that its solution is still periodic if and only if the ratio between the
frequencies of oscillation is a rational number. We investigated, analytically
and numerically, the solutions of this NC oscillator in a two-dimensional
phase-space. The result led us to conclude that noncommutativity induces a
stable perturbation into the commutative standard oscillator and that the
rotational symmetry is not broken. Besides, we have demonstrated through the
equations of motion that a zero momentum $\pi_{ij}$ originated a constant NC
parameter, namely, $\theta^{ij}=const.$, which changes the original variable
characteristic of $\theta^{ij}$ and reduces the phase-space of the system. This
result shows that the momentum $\pi_{ij}$ is relevant and cannot be neglected
when we have that $\theta^{ij}$ is a coordinate of the system.


title: In-in formalism, pseudo-instantons and rethinking quantum cosmology

abstract:
  Unlike flat space quantum field theories that focus on scattering amplitudes,
the main observables in quantum cosmology are correlation functions. The
systematic way of calculating correlators is called in-in formalism, which
requires only a single asymptotic region, i.e. past infinity. The rules in
perturbation theory and the path integral measure are very different for in-in
and in-out formalisms, and thus the results which are standard in one approach
may not necessarily hold in the other one. We show that stationary phase
approximation works completely different for a scalar in-in path integral.
Hence, in a cosmological background there are solutions, pseudo-instantons,
that allow tunneling between locally stable vacua even in infinite volume,
which is counterintuitive from an in-out perspective. We argue that various
familiar notions of in-out formalism must be reexamined in the in-in formalism,
which might have important consequences for quantum cosmology.


title: Real-time Bidding for Online Advertising: Measurement and Analysis

abstract:
  The real-time bidding (RTB), aka programmatic buying, has recently become the
fastest growing area in online advertising. Instead of bulking buying and
inventory-centric buying, RTB mimics stock exchanges and utilises computer
algorithms to automatically buy and sell ads in real-time; It uses per
impression context and targets the ads to specific people based on data about
them, and hence dramatically increases the effectiveness of display
advertising. In this paper, we provide an empirical analysis and measurement of
a production ad exchange. Using the data sampled from both demand and supply
side, we aim to provide first-hand insights into the emerging new impression
selling infrastructure and its bidding behaviours, and help identifying
research and design issues in such systems. From our study, we observed that
periodic patterns occur in various statistics including impressions, clicks,
bids, and conversion rates (both post-view and post-click), which suggest
time-dependent models would be appropriate for capturing the repeated patterns
in RTB. We also found that despite the claimed second price auction, the first
price payment in fact is accounted for 55.4% of total cost due to the
arrangement of the soft floor price. As such, we argue that the setting of soft
floor price in the current RTB systems puts advertisers in a less favourable
position. Furthermore, our analysis on the conversation rates shows that the
current bidding strategy is far less optimal, indicating the significant needs
for optimisation algorithms incorporating the facts such as the temporal
behaviours, the frequency and recency of the ad displays, which have not been
well considered in the past.


title:
The two-point correlation function of the fractional parts of \sqrt{n}
  is Poisson

abstract:
  Elkies and McMullen [Duke Math.J.~123 (2004) 95--139] have shown that the
gaps between the fractional parts of \sqrt n for n=1,\ldots,N, have a limit
distribution as N tends to infinity. The limit distribution is non-standard and
differs distinctly from the exponential distribution expected for independent,
uniformly distributed random variables on the unit interval. We complement this
result by proving that the two-point correlation function of the above sequence
converges to a limit, which in fact coincides with the answer for independent
random variables. We also establish the convergence of moments for the
probability of finding r points in a randomly shifted interval of size 1/N. The
key ingredient in the proofs is a non-divergence estimate for translates of
certain non-linear horocycles.


title:
Implicit scaffolding in interactive simulations: Design strategies to
  support multiple educational goals

abstract:
  We build on theoretical foundations of tool-mediated learning, tool design,
and human computer interaction to develop a framework for implicit scaffolding
in learning environments. Implicit scaffolding employs affordances,
constraints, cueing, and feedback in order to frame and scaffold student
exploration without explicit guidance, and it is a particularly useful design
framework for interactive simulations in science and mathematics. A key purpose
of implicit scaffolding is to support a range of educational goals including
affect, process, and content. In particular, the use of implicit scaffolding
creates learning environments that are productive for content learning and are
able to simultaneously support the affective goals of student agency and
ownership over the learning process - goals that may not be addressed in more
directed learning environments. We describe how the framework is applied in the
context of the Energy Skate Park: Basics simulation, a simulation aimed at
middle school student learning of energy concepts. Interview data provides an
exemplar of the process by which implicit scaffolding can support productive
student exploration with a computer simulation. While we present this framework
for implicit scaffolding in the context of computer simulations, the framework
can be extended and adapted to apply to a range of tool-mediated learning
environments.


title: Minimal supersolutions of BSDEs under volatility uncertainty

abstract:
  We study the existence of minimal supersolutions of BSDEs under a family of
mutually singular probability measures. We consider generators that are jointly
lower semicontinuous, positive, and either convex in the control variable and
monotone in the value variable, or that fulfill a specific normalization
property.


title: The hybrid opacity code SCO-RCG: recent developments

abstract:
  Absorption and emission spectra of multicharged-ion plasmas contain a huge
number of electron configurations and electric-dipolar lines, which can be
handled by global methods. However, some transition arrays consist only of a
small bunch of lines. For that reason, we developed the hybrid opacity code
SCO-RCG combining the (statistical) super-transition-array method and the
(detailed) fine-structure calculation (requiring the diagonalization of the
Hamiltonian matrix) of atomic structure. In order to decide whether a detailed
treatment of lines is necessary and to determine the validity of statistical
methods, the code involves criteria taking into account coalescence of lines
and porosity (localized absence of lines) in transition arrays. Data required
for the calculation of detailed transition arrays (Slater, spin-orbit and
dipolar integrals) are provided by the super-configuration code SCO, which
takes into account plasma screening effects on wavefunctions. Then, level
energies and lines are calculated by Cowan's code. Transition arrays for which
a detailed treatment is not required or impossible are described statistically,
by UTA (Unresolved Transition Arrays) and STA (Super Transition Arrays)
formalisms used in SCO. Recent developments are presented, such as the
extension of the PRTA (Partially Resolved Transition Array) model to the hybrid
approach, as well as comparisons with experimental spectra (laser or Z-pinch).


title: Production of Energetic Light Fragments in Spallation Reactions

abstract:
  Different reaction mechanisms contribute to the production of light fragments
(LF) from nuclear reactions. Available models cannot accurately predict
emission of LF from arbitrary reactions. However, the emission of LF is
important for many applications, such as cosmic-ray-induced single event
upsets, radiation protection, and cancer therapy with proton and heavy-ion
beams, to name just a few. The cascade-exciton model (CEM) and the Los Alamos
version of the quark-gluon string model (LAQGSM), as implemented in the
CEM03.03 and LAQGSM03.03 event generators used in the Los Alamos transport code
MCNP6, describe quite well the spectra of fragments with sizes up to 4He across
a broad range of target masses and incident energies. However, they do not
predict high-energy tails for LF heavier than 4He. The standard versions of CEM
and LAQGSM do not account for preequilibrium emission of LF larger than 4He.
The aim of our work is to extend the preequilibrium model to include such
processes. We do this by including the emission of fragments heavier than 4He
at the preequilibrium stage, and using an improved version of the Fermi
Break-up model, providing improved agreement with various experimental data.


title: Explicit bounds from the Alon-Boppana theorem

abstract:
  The purpose of this paper is to give explicit methods for bounding the number
of vertices of finite $k$-regular graphs with given second eigenvalue. Let $X$
be a finite $k$-regular graph and $\mu_1(X)$ the second largest eigenvalue of
its adjacency matrix. It follows from the well-known Alon-Boppana Theorem, that
for any $\epsilon > 0$ there are only finitely many such $X$ with $\mu_1(X) <
(2 - \epsilon) \sqrt{k - 1}$, and we effectively implement Serre's quantitative
version of this result. For any $k$ and $\epsilon$, this gives an explicit
upper bound on the number of vertices in a $k$-regular graph with $\mu_1(X) <
(2 - \epsilon) \sqrt{k - 1}$.


title:
On the number of outer automorphisms of the automorphism group of a
  right-angled Artin group

abstract:
  We show that there is no uniform upper bound on |Out(Aut(A))| when A ranges
over all right-angled Artin groups. This is in contrast with the cases where A
is free or free abelian: for all n, Dyer-Formanek and Bridson-Vogtmann showed
that Out(Aut(F_n)) = 1, while Hua-Reiner showed |Out(Aut(Z^n)| = |Out(GL(n,Z))|
< 5. We also prove the analogous theorem for Out(Out(A)). We establish our
results by giving explicit examples; one useful tool is a new class of graphs
called austere graphs.


title:
Potential-field estimation from satellite data using scalar and vector
  Slepian functions

abstract:
  In the last few decades a series of increasingly sophisticated satellite
missions has brought us gravity and magnetometry data of ever improving
quality. To make optimal use of this rich source of information on the
structure of Earth and other celestial bodies, our computational algorithms
should be well matched to the specific properties of the data. In particular,
inversion methods require specialized adaptation if the data are only locally
available, their quality varies spatially, or if we are interested in model
recovery only for a specific spatial region. Here, we present two approaches to
estimate potential fields on a spherical Earth, from gradient data collected at
satellite altitude. Our context is that of the estimation of the gravitational
or magnetic potential from vector-valued measurements. Both of our approaches
utilize spherical Slepian functions to produce an approximation of local data
at satellite altitude, which is subsequently transformed to the Earth's
spherical reference surface. The first approach is designed for
radial-component data only, and uses scalar Slepian functions. The second
approach uses all three components of the gradient data and incorporates a new
type of vectorial spherical Slepian functions which we introduce in this
chapter.


title: Driven flow with exclusion and transport in graphene-like structures

abstract:
  The totally asymmetric simple exclusion process (TASEP), a well-known model
in its strictly one-dimensional (chain) version, is generalized to cylinder
(nanotube) and ribbon (nanoribbon) geometries. A mean-field theoretical
description is given for very narrow ribbons ("necklaces"), and nanotubes. For
specific configurations of bond transmissivity rates, and for a variety of
boundary conditions, theory predicts equivalent steady state behavior between
(sublattices on) these structures and chains. This is verified by numerical
simulations, to excellent accuracy, by evaluating steady-state currents. We
also numerically treat ribbons of general width. We examine the adequacy of
this model to the description of electronic transport in carbon nanotubes and
nanoribbons, or specifically-designed quantum dot arrays.