title:
Nuclear-size self-energy and vacuum-polarization corrections to the
  bound-electron g factor

abstract:
  The finite nuclear-size effect on the leading bound-electron g factor and the
one-loop QED corrections to the bound-electron g factor is investigated for the
ground state of hydrogen-like ions. The calculation is performed to all orders
in the nuclear binding strength parameter Z\alpha\ (where Z is the nuclear
charge and \alpha\ is the fine structure constant) and for the Fermi model of
the nuclear charge distribution. In the result, theoretical predictions for the
isotope shift of the 1s bound-electron g factor are obtained, which can be used
for the determination of the difference of nuclear charge radii from
experimental values of the bound-electron g factors for different isotopes.


title:
Cross-Recurrence Quantification Analysis of Categorical and Continuous
  Time Series: an R package

abstract:
  This paper describes the R package crqa to perform cross-recurrence
quantification analysis of two time series of either a categorical or
continuous nature. Streams of behavioral information, from eye movements to
linguistic elements, unfold over time. When two people interact, such as in
conversation, they often adapt to each other, leading these behavioral levels
to exhibit recurrent states. In dialogue, for example, interlocutors adapt to
each other by exchanging interactive cues: smiles, nods, gestures, choice of
words, and so on. In order for us to capture closely the goings-on of dynamic
interaction, and uncover the extent of coupling between two individuals, we
need to quantify how much recurrence is taking place at these levels. Methods
available in crqa would allow researchers in cognitive science to pose such
questions as how much are two people recurrent at some level of analysis, what
is the characteristic lag time for one person to maximally match another, or
whether one person is leading another. First, we set the theoretical ground to
understand the difference between 'correlation' and 'co-visitation' when
comparing two time series, using an aggregative or cross-recurrence approach.
Then, we describe more formally the principles of cross-recurrence, and show
with the current package how to carry out analyses applying them. We end the
paper by comparing computational efficiency, and results' consistency, of crqa
R package, with the benchmark MATLAB toolbox crptoolbox. We show perfect
comparability between the two libraries on both levels.


title: Direct Measurement of Surface Transport on a Bulk Topological Insulator

abstract:
  Topological insulators are guaranteed to support metallic surface states on
an insulating bulk, and one should thus expect that the electronic transport in
these materials is dominated by the surfaces states. Alas, due to the high
remaining bulk conductivity, surface contributions to transport have so-far
only been singled out indirectly via quantum oscillations, or for devices based
on gated and doped topological insulator thin films, a situation in which the
surface carrier mobility could be limited by defect and interface scattering.
Here we present the first direct measurement of surface-dominated conduction on
an atomically clean surface of bulk-insulating Bi$_2$Te$_2$Se. Using nano-scale
four point setups with variable contact distance, we show that the transport at
30 K is two-dimensional rather than three-dimensional and by combining these
measurements with angle-resolved photoemission results from the same crystals,
we find a surface state mobility of 390(30) cm$^{2}$V$^{-1}$s$^{-1}$ at 30 K at
a carrier concentration of 8.71(7)$\times 10^{12}$ cm$^{-2}$.


title:
Projective differential geometry of multidimensional dispersionless
  integrable hierarchies

abstract:
  We introduce a general setting for multidimensional dispersionless integrable
hierarchy in terms of differential $m$-form $\Omega_m$ with the coefficients
satisfying the Pl\"ucker relations, which is gauge-invariantly closed and its
gauge-invariant coordinates (ratios of coefficients) are (locally) holomorphic
with respect to one of the variables (the spectral variable). We demonstrate
that this form defines a hierarchy of dispersionless integrable equations in
terms of commuting vector fields locally holomorphic in the spectral variable.
The equations of the hierarchy are given by the gauge-invariant closedness
equations.


title: Gaps in the space of skeletal signatures

abstract:
  Skeletal signatures were introduced in [J W Anderson and A Wootton, A Lower
Bound for the Number of Group Actions on a Compact Riemann Surface, Algebr.
Geom. Topol. 12 (2012) 19--35.] as a tool to describe the space of all
signatures with which a group can act on a surface of genus $\sigma \geq 2$. In
the present paper we provide a complete description of the gaps that appear in
the space of skeletal signatures, together with proofs of the conjectures posed
in our earlier work.


title:
Path-integral Monte Carlo for the Gauge-fixed Berry Connection and the
  Local Z_2 Berry Phase

abstract:
  We present a general formula of the gauge-fixed Berry connection which can be
evaluated by path- integral Monte Carlo method. We also propose that the
gauge-fixed local Berry connection can be an- other effective tool to estimate
precisely the quantum critical point. For a demonstration, we calculate the
gauge-fixed Berry connection and the local Z2 Berry phase of the
antiferromagnetic Heisenberg model on a staggered bond-alternating ladder, and
estimated quantum critical point is consistent with other methods.


title:
Supersymmetric Lifshitz-like backgrounds from N=4 SYM with heavy quark
  density

abstract:
  We examine a class of gravity backgrounds obtained by considering the
backreaction of a spatially uniform density of mutually BPS Wilson lines or
heavy quarks in N=4 SUSY Yang-Mills theory. The configurations preserve eight
supercharges and an SO(5) subgroup of the SO(6) R-symmetry. They are obtained
by considering the 1/4-BPS geometries associated to smeared string/D3-brane
(F1-D3) intersections. We argue that for the (partially) localized
intersection, the geometry exhibits a flow from AdS_5 x S^5 in the UV to a
novel IR scaling solution displaying anisotropic Lifshitz-like scaling with
dynamical critical exponent z=7, hyperscaling violation and a logarithmic
running dilaton. We also obtain a two-parameter family of smeared 1/4-BPS
solutions on the Coulomb branch of N=4 SYM exhibiting Lifshitz scaling and
hyperscaling violation. For a certain parametric range these yield IR
geometries which are conformal to AdS_2 x R^3, and which have been argued to be
relevant for fermionic physics.


title: Localization and Chern numbers for weakly disordered BdG operators

abstract:
  After a short discussion of various random Bogoliubov-de Gennes (BdG) model
operators and the associated physics, the Aizenman-Molchanov method is applied
to prove Anderson localization in the weak disorder regime for the spectrum in
the central gap. This allows to construct random BdG operators which have
localized states in an interval centered at zero energy. Furthermore,
techniques for the calculation of Chern numbers are reviewed and applied to two
non-trivial BdG operators, the p+ip wave and d+id wave superconductors.


title:
Limit set intersection theorems for Kleinian groups and a conjecture of
  Susskind

abstract:
  We continue here the investigation of the relationship between the
intersection of a pair of subgroups of a Kleinian group, and in particular the
limit set of that intersection, and the intersection of the limit sets of the
subgroups. Of specific interest is the extent to which the intersection of the
limit sets being non-empty implies that the intersection of the subgroups is
non-trivial. We present examples to show that a conjecture of Susskind, stating
that the intersection of the sets of conical limit points of subgroups $\Phi$
and $\Theta$ of a Kleinian group $\Gamma$ is contained in the limit set of
$\Phi\cap \Theta$, is as sharp as can reasonably be expected. We further show
that Susskind's conjecture holds most of the time.


title:
Optimal decay estimates for time-fractional and other non-local
  subdiffusion equations via energy methods

abstract:
  We prove sharp estimates for the decay in time of solutions to a rather
general class of non-local in time subdiffusion equations on a bounded domain
subject to a homogeneous Dirichlet boundary condition. Important special cases
are the time-fractional and ultraslow diffusion equation, which have seen much
interest during the last years, mostly due to their applications in the
modeling of anomalous diffusion. We study the case where the equation is in
divergence form with bounded measurable coefficients. Our proofs rely on energy
estimates and make use of a new and powerful inequality for
integro-differential operators of the form $\partial_t (k\ast \cdot)$. The
results can be generalized to certain quasilinear equations. We illustrate this
by looking at the time-fractional $p$-Laplace and porous medium equation. Here
it turns out that the decay behaviour is markedly different from that in the
classical parabolic case.


title: On the spectral flow for Dirac operators with local boundary conditions

abstract:
  Let M be an even dimensional compact Riemannian manifold with boundary and
let D be a Dirac operator acting on the sections of the Clifford module E over
M. We impose certain local elliptic boundary conditions for D obtaining a
selfadjoint extension D_F of D. For a smooth U(n)--valued function g:M -> U(n)
we establish a formula for the spectral flow along the straight line between
D_F and g^{-1} D_F g. This spectral flow is motivated by index theory: in odd
dimensions it gives the natural pairing between the K--homology class of the
operator and the K--theory class of g.
  In our situation, with dim M having the "wrong" parity, the answer can be
expressed in terms of the natural spectral flow pairing on the odd--dimensional
boundary.
  Our result generalizes a recent paper by M. Prokhorova in which the
two-dimensional case is treated. Furthermore, our paper may be seen as an
odd-dimensional analogue of a paper by D. Freed. As an application we obtain a
new proof of the cobordism invariance of the spectral flow.


title:
Inhomogeneous BCS-BEC crossover for trapped cold atoms in optical
  lattices

abstract:
  The BCS-BEC crossover in a lattice is a powerful paradigm to understand how a
superconductor deviates from the Bardeen-Cooper-Schrieffer physics as the
attractive interaction increases. Optical lattices loaded with binary mixtures
of cold atoms allow to address it experimentally in a clean and controlled way.
We show that, however, the possibility to study this phenomenon in actual
cold-atoms experiments is limited by the effect of the trapping potential.
Real-space Dynamical Mean-Field Theory calculations show indeed that
interactions and the confining potential conspire to pack the fermions in the
center of the trap, which approaches a band insulator when the attraction
become sizeable. We show how this physics reflects in several observables, and
we propose an alternative strategy to disentangle the effect of the harmonic
potential and measure the intrinsic properties resulting from the interaction
strength.


title: Modeling microwave/electron-cloud interaction

abstract:
  Starting from the separate codes BI-RME and ECLOUD or PyECLOUD, we are
developing a novel joint simulation tool, which models the combined effect of a
charged particle beam and of microwaves on an electron cloud. Possible
applications include the degradation of microwave transmission in
tele-communication satellites by electron clouds; the microwave-transmission
tecchniques being used in particle accelerators for the purpose of
electroncloud diagnostics; the microwave emission by the electron cloud itself
in the presence of a magnetic field; and the possible suppression of
electron-cloud formation in an accelerator by injecting microwaves of suitable
amplitude and frequency. A few early simulation results are presented.


title: G-quadruplexes and mRNA localization

abstract:
  G-quadruplexes represent a novelty for molecular biology. Their role inside
the cell remains mysterious. We investigate a possible correlation with mRNA
localization. In particular, we hypothesize that Gquadruplexes influence fluid
dynamics.


title: A review on the discovery reach of Dark Matter directional detection

abstract:
  Directional detection of galactic Dark Matter offers a unique opportunity to
identify Weakly Interacting Massive Particle (WIMP) events as such. Depending
on the unknown WIMP-nucleon cross section, directional detection may be used to
: exclude Dark Matter, discover galactic Dark Matter with a high significance
or constrain WIMP and halo properties. We review the discovery reach of Dark
Matter directional detection.


title: Temperature induced inversion of oxygen response in CVD graphene on SiO2

abstract:
  We have synthesized single-layer graphene on Cu foils using chemical vapor
deposition method and transferred the graphene to the top of a Si/SiO2
substrate with a pair of prefabricated Ti/Au electrodes. A resistive
graphene-based gas sensor prepared in this way revealed n-type oxygen response
at room temperature and we have successfully fitted the data obtained with
varying oxygen levels using a two-site Langmuir model. P-type oxygen response
of our sensor was observed after the temperature was raised to 100 oC, with a
reversible transition to n-type behaviour when the temperature was lowered back
to room temperature. Such inversion of the gas response type with temperature
was interpreted as a result of interplay between the adsorbate-induced charge
transfer and charge carrier scattering. The transduction function was derived,
which relates the electrical response to surface coverage through both the
induced mobility and charge density changes.


title:
A Techno-economic Analysis of Network Migration to Software-Defined
  Networking

abstract:
  As the Software Defined Networking (SDN) paradigm gains momentum, every
network operator faces the obvious dilemma: when and how to migrate from
existing IP routers to SDN compliant equipments. A single step complete
overhaul of a fully functional network is impractical, while at the same time,
the immediate benefits of SDN are obvious. A viable solution is thus a gradual
migration over time, where questions of which routers should migrate first, and
whether the order of migration makes a difference, can be analyzed from techno
economic and traffic engineering perspective. In this paper, we address these
questions from the techno economic perspective, and establish the importance of
migration scheduling. We propose optimization techniques and greedy algorithms
to plan an effective migration schedule, based on various techno economic
aspects, such as technological gains in combinations with CapEx limitations. We
demonstrate the importance of an effective migration sequence through two
relevant network management metrics, namely, number of alternative paths
availed by a node on migration, and network capacity savings. Our results
suggest that the sequence of migration plays a vital role, especially in the
early stages of network migration to SDN.


title: Transverse Momentum Distributions at the LHC and Tsallis Thermodynamics

abstract:
  An overview is presented of transverse momentum distributions of particles at
the LHC using the Tsallis distribution. The use of a thermodynamically
consistent form of this distribution leads to an excellent description of
charged and identified particles. The values of the Tsallis parameter q are
truly remarkably consistent.


title:
Synaptic metaplasticity underlies tetanic potentiation in Lymnaea: a
  novel paradigm

abstract:
  We present a mathematical model which explains and interprets a novel form of
short-term potentiation, which was found to be use-, but not time-dependent, in
experiments done on Lymnaea neurons. The high degree of potentiation is
explained using a model of synaptic metaplasticity, while the use-dependence
(which is critically reliant on the presence of kinase in the experiment) is
explained using a model of a stochastic and bistable biological switch.


title: Generalized Killing spinors on spheres

abstract:
  We study generalized Killing spinors on round spheres $\mathbb{S}^n$. We show
that on the standard sphere $\mathbb{S}^8$ any generalized Killing spinor has
to be an ordinary Killing spinor. Moreover we classify generalized Killing
spinors on $\mathbb{S}^n$ whose associated symmetric endomorphism has at most
two eigenvalues and recover in particular Agricola--Friedrich's canonical
spinor on 3-Sasakian manifolds of dimension 7. Finally we show that it is not
possible to deform Killing spinors on standard spheres into genuine generalized
Killing spinors.


title:
Experimental approaches to universal out-of-equilibrium scaling laws:
  turbulent liquid crystal and other developments

abstract:
  This is a brief survey of recent experimental studies on out-of-equilibrium
scaling laws, focusing on two prominent situations where non-trivial
universality classes have been identified theoretically: absorbing-state phase
transitions and growing interfaces. First the article summarizes main results
obtained for electrically-driven turbulent liquid crystal, which exhibited the
scaling laws for the directed percolation class at the transition between two
turbulent regimes, and those for the Kardar-Parisi-Zhang class in the
supercritical phase where one turbulent regime invades the other. Other
experimental investigations on these universality classes and related
situations are then overviewed and discussed. Some remarks on analyses of these
scaling laws are also given from the practical viewpoints.


title:
Field Induced Magnetic Ordering and Single-ion Anisotropy in the
  Quasi-1D Haldane Chain Compound SrNi2V2O8: A Single Crystal investigation

abstract:
  Field-induced magnetic ordering in the Haldane chain compound
SrNi$_{2}$V$_{2}$O$_{8}$ and effect of anisotropy have been investigated using
single crystals. Static susceptibility, inelastic neutron scattering,
high-field magnetization, and low temperature heat-capacity studies confirm a
non-magnetic spin-singlet ground state and a gap between the singlet ground
state and triplet excited states. The intra-chain exchange interaction is
estimated to be $J \sim 8.9{\pm}$0.1 meV. Splitting of the dispersions into two
modes with minimum energies 1.57 and 2.58 meV confirms the existence of
single-ion anisotropy $D(S^z){^2}$. The value of {\it D} is estimated to be
$-0.51{\pm}0.01$ meV and the easy axis is found to be along the
crystallographic {\it c}-axis. Field-induced magnetic ordering has been found
with two critical fields [$\mu_0H_c^{\perp c} = 12.0{\pm}$0.2 T and
$\mu_0H_c^{\parallel c} = 20.8{\pm}$0.5 T at 4.2 K]. Field-induced
three-dimensional magnetic ordering above the critical fields is evident from
the heat-capacity, susceptibility, and high-field magnetization study. The
Phase diagram in the {\it H-T} plane has been obtained from the high-field
magnetization. The observed results are discussed in the light of theoretical
predictions as well as earlier experimental reports on Haldane chain compounds.


title: Energy Momentum Tensor Correlators in Improved Holographic QCD

abstract:
  In this thesis, we study the physics of the quark gluon plasma (QGP) using
holographic methods borrowed from string theory. We start our discussion by
motivating the use of such machinery, explaining how recent experimental
results from the LHC and RHIC colliders suggests that the created QGP should be
described as a strongly coupled liquid with small but nonvanishing bulk and
shear viscosities. We argue that holographic dualities are a very efficient
framework for studying transport properties in such a medium.
  Next, we introduce the underlying physics behind all holographic dualities,
the AdS/CFT correspondence, and then motivate the necessity of implementing
conformal invariance breaking in them. After this, we present the
phenomenologically most successful holographic model of the strong interactions
- Improved Holographic QCD (IHQCD).
  Working within IHQCD, we next move on to calculate energy momentum tensor
correlators in the bulk and shear channels of large-Nc Yang-Mills theory. In
the shear channel, we confront our results with those derived in strongly
coupled N=4 Super Yang-Mills theory as well as weakly interacting ordinary
Yang-Mills theory. Close to the critical temperature of the deconfinement
transition, we observe significant effects of conformal invariance breaking. In
the bulk channel, where the conformal result is trivial, we make comparisons
with both perturbative and lattice QCD. We observe that lattice data seem to
favor our holographic prediction over the perturbative one over a wide range of
temperatures.


title: Poincare Protection for a Natural Electroweak Scale

abstract:
  We discuss a class of technically-natural UV extensions of the Standard Model
in which the electroweak scale is shielded from large radiative corrections
from heavy UV physics due to an enhanced Poincare symmetry. Such heavy sectors
can be invoked to provide solutions to known shortcomings of the Standard
Model, such the strong-CP problem, the absence of dark matter, and the lack of
neutrino masses. We discuss the relationship to scale-invariant models.


title:
Identification of twenty-three accreting binaries in the Galactic Bulge
  Survey

abstract:
  (Abridged:) We present the identification of optical counterparts to 23
Galactic Bulge Survey X-ray sources. We report their accurate coordinates and
optical spectra acquired at the VLT and Magellan. All sources are classified as
accreting binaries according to their emission line characteristics. To
distinguish accreting binaries from chromospherically active objects we develop
and explain criteria based on Halpha and HeI 5786,6678 emission line properties
available in the literature. The spectroscopic properties and photometric
variability of all the objects are discussed and a classification of the source
is given where possible. Among the 23 systems, at least 9 of them show an
accretion-dominated optical spectrum (CX28, CX63, CX70, CX128, CX142, CX207,
CX522, CX794, CX1011) and another 6 show photospheric lines from a late-type
donor star in addition to accretion disc emission (CX44, CX93, CX137, CX154,
CX377 and CX1004) indicating that they are probably accreting binaries in
quiescence or in a low accretion rate state. Two sources are confirmed to be
eclipsing: CX207 and CX794. CX207 shows a broad asymmetric Halpha profile
blue-shifted by >300 km/s. Such line profile characteristics are consistent
with a magnetic (Polar) CV. CX794 is an eclipsing nova-like CV in the period
gap. Time-resolved photometry and the large broadening of the Halpha emission
lines in CX446 (2100 km/s FWHM) suggest that this is also an eclipsing or
high-inclination accreting binary. Finally, the low-accretion rate source
CX1004 shows a double-peaked Halpha profile with a FWHM of 2100 km/s. This
supports a high inclination or even eclipsing system. Whether the compact
object is a white dwarf in an eclipsing CV or a black hole primary in a
high-inclination LMXB remains to be established.


title:
A Note on Regularity and Uniqueness of Natural Convection with Effects
  of Viscous Dissipation in 3D Open Channels

abstract:
  We prove the existence of unique regular solutions of steady-state
buoyancy-driven flows of viscous incompressible heat-conducting fluids in 3D
open channels under mixed boundary conditions. The model takes into account the
phenomena of the viscous energy dissipation.


title: A class of fast exact Bayesian filters in dynamical models with jumps

abstract:
  In this paper, we focus on the statistical filtering problem in dynamical
models with jumps. When a particular application relies on physical properties
which are modeled by linear and Gaussian probability density functions with
jumps, an usualmethod consists in approximating the optimal Bayesian estimate
(in the sense of the Minimum Mean Square Error (MMSE)) in a linear and Gaussian
Jump Markov State Space System (JMSS). Practical solutions include algorithms
based on numerical approximations or based on Sequential Monte Carlo (SMC)
methods. In this paper, we propose a class of alternative methods which
consists in building statistical models which share the same physical
properties of interest but in which the computation of the optimal MMSE
estimate can be done at a computational cost which is linear in the number of
observations.


title: Maximal families of nodal varieties with defect

abstract:
  In this paper we prove that a nodal hypersurface in P^4 with defect has at
least (d-1)^2 nodes, and if it has at most 2(d-2)(d-1) nodes and d>6 then it
contains either a plane or a quadric surface. Furthermore, we prove that a
nodal double cover of P^3 ramified along a surface of degree 2d with defect has
at least d(2d-1) nodes. We construct the largest dimensional family of nodal
degree d hypersurfaces in P^(2n+2) with defect for d sufficiently large.


title: Measurement-based Quantum Computation Under Different Types of Noises

abstract:
  Measurement based quantum computation (MBQC) is an effective paradigm for
universal quantum computation. In this scheme, the universal set of quantum
gates are realized by only local measurements on the prior prepared cluster
states. The inevitable decoherence is harmful to the realization of those
quantum gates. Here, we investigate the performance of the quantum gates
exposed to different type of noises. We find that some errors may not influence
the success of the quantum gates, in contrast, some others may destroy their
realization. We show that there is a controlling pattern that can protect
quantum gates from certain types of noises and thus can improve the success
probability of the gates implementation.


abstract:
  In recent years there has been a significant increase in the use of graphs as
a tool for representing information. It is very important to preserve the
privacy of users when one wants to publish this information, especially in the
case of social graphs. In this case, it is essential to implement an
anonymization process in the data in order to preserve users' privacy. In this
paper we present an algorithm for graph anonymization, called Evolutionary
Algorithm for Graph Anonymization (EAGA), based on edge modifications to
preserve the k-anonymity model.


title: Torque-operated gradient-index axicon

abstract:
  We describe a gradient-index axicon based on twisting of crystals. We
demonstrate that the focal length of the axicon can be efficiently operated by
the torsion moment. The working analytical relations describing the focal
length of the axicon and its dependence on different geometrical parameters as
well as the torsion moment has been derived.


title: Rare Kaon Decay Experiments at CERN

abstract:
  The NA62 experiment at the CERN SPS aims to measure the branching ratio of
the rare decay $K^+\to\pi^+\nu\bar\nu$ with a relative precision of $\sim10%$.
To achieve that goal, it is designed to be exposed to $1.2\times 10^{13}$ $K^+$
decays in its fiducial volume. The unprecedented $K^+$ flux will lead to record
sensitivities to rare and forbidden decays of $K^+$ and $\pi^0$, including
those that violate lepton flavour or lepton number conservation. The expected
NA62 performances for lepton flavour conservation and lepton universality tests
are discussed. Relevant on-going or recently completed measurements from the
$K^\pm$ decay data sets collected by earlier kaon experiments at CERN (NA48/2
and NA62-$R_K$) are also presented.


title:
Comment on "Motion of a helical vortex filament in superfluid 4He under
  the extrinsic form of the local induction approximation"

abstract:
  We comment on the paper by Van Gorder ["Motion of a helical vortex filament
in superfluid ${}^4$He under the extrinsic form of the local induction
approximation", Phys. Fluids 25, 085101 (2013)]. We point out that the flow of
the normal fluid component parallel to the vortex will often lead into the
Donnelly-Glaberson instability, which will cause the amplification of the
Kelvin wave. We explain why the comparison to local nonlinear equation is
unreasonable, and remark that neglecting the motion in the $x$-direction is not
reasonable for a Kelvin wave with an arbitrary wave length and amplitude. The
correct equations in the general case are also derived.


title: Constructing Metallic Nanoroad on MoS2 Monolayer via Hydrogenation

abstract:
  Monolayer transition metal dichalcogenides recently emerge as a new family of
two-dimensional material potentially suitable for numerous applications in
electronic and optoelectronic devices due to the presence of finite band gap.
Many proposed applications require efficient transport of charge carriers
within these semiconducting monolayers. However, how to construct a stable
conducting nanoroad on these atomically thin semiconductors is still a
challenge. Here we demonstrate that hydrogenation on the surface of MoS2
monolayer induces a semiconductor-metal transition, and strip-patterned
hydrogenation is able to generate a conducting nanoroad. The band-gap closing
arises from the formation of in-gap hybridized states mainly consisting of Mo
4d orbitals, as well as the electron donation from hydrogen to the lattice
host. Ballistic conductance calculations reveal that such a nanoroad on the
MoS2 surface exhibits an integer conductance, indicating small carrier
scattering, and thus is ideal for serving as a conducting channel or
interconnect without compromising the mechanical and structural integrity of
the monolayer.


title: Group Sparse Beamforming for Green Cloud-RAN

abstract:
  A cloud radio access network (Cloud-RAN) is a network architecture that holds
the promise of meeting the explosive growth of mobile data traffic. In this
architecture, all the baseband signal processing is shifted to a single
baseband unit (BBU) pool, which enables efficient resource allocation and
interference management. Meanwhile, conventional powerful base stations can be
replaced by low-cost low-power remote radio heads (RRHs), producing a green and
low-cost infrastructure. However, as all the RRHs need to be connected to the
BBU pool through optical transport links, the transport network power
consumption becomes significant. In this paper, we propose a new framework to
design a green Cloud-RAN, which is formulated as a joint RRH selection and
power minimization beamforming problem. To efficiently solve this problem, we
first propose a greedy selection algorithm, which is shown to provide near-
optimal performance. To further reduce the complexity, a novel group sparse
beamforming method is proposed by inducing the group-sparsity of beamformers
using the weighted $\ell_1/\ell_2$-norm minimization, where the group sparsity
pattern indicates those RRHs that can be switched off. Simulation results will
show that the proposed algorithms significantly reduce the network power
consumption and demonstrate the importance of considering the transport link
power consumption.


title:
Crack front \'echelon instability in mixed mode fracture of a strongly
  nonlinear elastic solid

abstract:
  Mixed mode (I+III) loading induces segmented crack front \'echelon structures
connected by steps. We study this instability in a highly deformable,
strain-hardening material. We find that \'echelons develop beyond a finite,
size-independent mode mixity threshold, markedly growing with energy release
rate. They appear via nucleation of localized helical front distortions, and
their emergence is the continuation of the mode I cross-hatching instability of
gels and rubbers, shifted by the biasing effect of shear. This result, at odds
with the direct bifurcation predicted by linear elastic fracture mechanics, can
be assigned to the controlling role of elastic nonlinearity.


title:
Assessing the calibration of high-dimensional ensemble forecasts using
  rank histograms

abstract:
  Any decision making process that relies on a probabilistic forecast of future
events necessarily requires a calibrated forecast. This paper proposes new
methods for empirically assessing forecast calibration in a multivariate
setting where the probabilistic forecast is given by an ensemble of equally
probable forecast scenarios. Multivariate properties are mapped to a single
dimension through a pre-rank function and the calibration is subsequently
assessed visually through a histogram of the ranks of the observation's
pre-ranks. Average ranking assigns a pre-rank based on the average univariate
rank while band depth ranking employs the concept of functional band depth
where the centrality of the observation within the forecast ensemble is
assessed. Several simulation examples and a case study of temperature forecast
trajectories at Berlin Tegel Airport in Germany demonstrate that both
multivariate ranking methods can successfully detect various sources of
miscalibration and scale efficiently to high dimensional settings.


title: Technologies for Delivery of Proton and Ion Beams for Radiotherapy

abstract:
  Recent developments for the delivery of proton and ion beam therapy have been
significant, and a number of technological solutions now exist for the creation
and utilisation of these particles for the treatment of cancer. In this paper
we review the historical development of particle accelerators used for external
beam radiotherapy and discuss the more recent progress towards more capable and
cost-effective sources of particles.


title:
Non-normality in combustion-acoustic interaction in diffusion flames: a
  critical revision

abstract:
  Perturbations in a non-normal system can grow transiently even if the system
is linearly stable. If this transient growth is sufficiently large, it can
trigger self-sustained oscillations from small initial disturbances. This has
important practical consequences for combustion-acoustic oscillations, which
are a continual problem in rocket and aircraft engines. Balasubramanian and
Sujith (Journal of Fluid Mechanics, 2008, 594, 29-57) modelled an infinite-rate
chemistry diffusion flame in an acoustic duct and found that the transient
growth in this system can amplify the initial energy by a factor, $G_{max}$, of
order $10^5$ to $10^7$. However, recent investigations by L. Magri & M. P.
Juniper have brought to light certain errors in that paper. When the errors are
corrected, $G_{max}$ is found to be of order 1 to 10, revealing that
non-normality is not as influential as it was thought to be.


title: Exact reconstruction formulas for a Radon transform over cones

abstract:
  Inversion of Radon transforms is the mathematical foundation of many modern
tomographic imaging modalities. In this paper we study a conical Radon
transform, which is important for computed tomography taking Compton scattering
into account. The conical Radon transform we study integrates a function in
$\R^d$ over all conical surfaces having vertices on a hyperplane and symmetry
axis orthogonal to this plane. As the main result we derive exact
reconstruction formulas of the filtered back-projection type for inverting this
transform.


title: Efficient decoy-state quantum key distribution with quantified security

abstract:
  We analyse the finite-size security of the efficient Bennett-Brassard 1984
protocol implemented with decoy states and apply the results to a
gigahertz-clocked quantum key distribution system. Despite the enhanced
security level, the obtained secure key rates are the highest reported so far
at all fibre distances.


title: Close neighbors of Markarian galaxies. II. Statistics and discussions

abstract:
  According to the database from the first paper, we select 180 pairs with dV <
800 km/s and Dp < 60 kpc containing Markarian (MRK) galaxies. We study the
dependence of galaxies integral parameters, star-formation (SF) and active
galactic nuclei (AGN) properties on kinematics of pairs, their structure and
large-scale environments. Following main results were obtained: projected
radial separation Dp between galaxies correlates with the perturbation level P
of the pairs. Both parameters do not correlate with line-of-sight velocity
difference dV of galaxies. Dp and P are better measures of interaction strength
than dV. The latter correlates with the density of large-scale environment and
with the morphologies of galaxies. Both galaxies in a pair are of the same
nature, the only difference is that MRK galaxies are usually brighter than
their neighbors in average by 0.9 mag. Specific star formation rates (SSFR) of
galaxies in pairs with smaller Dp or dV is in average 0.5 dex higher than that
of galaxies in pairs with larger Dp or dV. Closeness of a neighbor with the
same and later morphological type increases the SSFR, while earlier-type
neighbors do not increase SSFR. Major interactions/mergers trigger SF and AGN
more effectively than minor ones. The fraction of AGNs is higher in more
perturbed pairs and pairs with smaller Dp. AGNs typically are in stronger
interacting systems than star-forming and passive galaxies. There are
correlations of both SSFRs and spectral properties of nuclei between pair
members.


title: Towards Base Rates in Software Analytics

abstract:
  Nowadays a vast and growing body of open source software (OSS) project data
is publicly available on the internet. Despite this public body of project
data, the field of software analytics has not yet settled on a solid
quantitative base for basic properties such as code size, growth, team size,
activity, and project failure. What is missing is a quantification of the base
rates of such properties, where other fields (such as medicine) commonly rely
on base rates for decision making and the evaluation of experimental results.
The lack of knowledge in this area impairs both research activities in the
field of software analytics and decision making on software projects in
general. This paper contributes initial results of our research towards
obtaining base rates using the data available at Ohloh (a large-scale index of
OSS projects). Zooming in on the venerable 'lines of code' metric for code size
and growth, we present and discuss summary statistics and identify further
research challenges.


title: MOM renormalization group functions in the maximal abelian gauge

abstract:
  The one loop 3-point vertex functions of QCD in the maximal abelian gauge
(MAG) are evaluated at the fully symmetric point at one loop. As a consequence
the theory is renormalized in the various momentum (MOM) schemes which are
defined by the trivalent vertices, as well as in the MSbar scheme. From these
the two loop renormalization group functions in the MOM schemes are derived
using the one loop conversion functions. In parallel we repeat the analysis for
the Curci-Ferrari gauge which corresponds to the MAG in a specific limit. The
relation between the Lambda parameters in different schemes is also provided.


title: Surprises in the Hard X-ray Sky

abstract:
  Cosmic objects emit throughout the electro-magnetic spectrum, from radio
waves to very high-energy gamma rays. Some spectral regions can be observed
from the ground, but space instrumentation is needed for most of them. Some
spectral regions are particularly difficult, for example hard X-rays and MeV
gamma rays. For one thing, in this spectral region photons interact least with
matter. Moreover, no focussing optics was available until very recently.
INTEGRAL, the gamma ray observatory mission led by ESA, was designed to observe
the sky in this very domain.


title: Local BRST cohomology for AKSZ field theories: a global approach I

abstract:
  We study the Lagrangian antifield BRST formalism, formulated in terms of
exterior horizontal forms on the infinite order jet space of graded fields for
topological field theories associated to $Q$-bundles. In the case of a trivial
Q-bundle with a flat fiber and arbitrary base, we prove that the BRST
cohomology are isomorphic to the cohomology of the target space differential
"twisted" by the de Rham cohomology of the base manifold. This generalizes the
local result of G. Barnich and M. Grigoriev, computed for a flat base manifold.


title: The Virial Theorem and the Ground State Problem in Polaron Theory

abstract:
  The virial theorem for the translation-invariant theory of a polaron [3] is
discussed. It is shown that, in [3], Tulub made a nonoptimal choice of
variational parameters in the strong-coupling limit, which led to the violation
of the virial relations. The introduction of an additional variational
parameter to the test function reduces the polaron energy and makes it possible
to satisfy the relations of the virial theorem for a strong-coupling polaron
(the Pekar 1 : 2 : 3 : 4 theorem).


title: On the order of indeterminate moment problems

abstract:
  For an indeterminate moment problem we denote the orthonormal polynomials by
P_n. We study the relation between the growth of the function
P(z)=(\sum_{n=0}^\infty|P_n(z)|^2)^{1/2} and summability properties of the
sequence (P_n(z)). Under certain assumptions on the recurrence coefficients
from the three term recurrence relation
zP_n(z)=b_nP_{n+1}(z)+a_nP_n(z)+b_{n-1}P_{n-1}(z), we show that the function P
is of order \alpha with 0<\alpha<1, if and only if the sequence (P_n(z)) is
absolutely summable to any power greater than 2\alpha. Furthermore, the order
\alpha is equal to the exponent of convergence of the sequence (b_n).
  Similar results are obtained for logarithmic order and for more general types
of slow growth. To prove these results we introduce a concept of an order
function and its dual.
  We also relate the order of P with the order of certain entire functions
defined in terms of the moments or the leading coefficient of P_n


title: Gibbs measures on permutations over one-dimensional discrete point sets

abstract:
  We consider Gibbs distributions on permutations of a locally finite infinite
set $X\subset\mathbb{R}$, where a permutation $\sigma$ of $X$ is assigned
(formal) energy $\sum_{x\in X}V(\sigma(x)-x)$. This is motivated by Feynman's
path representation of the quantum Bose gas; the choice $X:=\mathbb{Z}$ and
$V(x):=\alpha x^2$ is of principal interest. Under suitable regularity
conditions on the set $X$ and the potential $V$, we establish existence and a
full classification of the infinite-volume Gibbs measures for this problem,
including a result on the number of infinite cycles of typical permutations.
Unlike earlier results, our conclusions are not limited to small densities
and/or high temperatures.


title: Perfect correspondences and Chow motives

abstract:
  It is an open conjecture of Orlov that the bounded derived category of
coherent sheaves of a smooth projective variety determines its Chow motive with
rational coefficients. In this master's thesis we introduce a category of
\emph{perfect correspondences}, whose objects are smooth projective varieties
and morphisms $X \to Y$ are perfect complexes on $X \times Y$. We show that
isomorphism in this category is the same as equivalence of derived categories,
and use this to show that the derived category determines the noncommutative
Chow motive (in the sense of Tabuada) and, up to Tate twists, the commutative
Chow motive with rational coefficients. In particular, all additive invariants
like K-theory and Hochschild or cyclic homology depend only on the derived
category.


title: Use of Solr and Xapian in the Invenio document repository software

abstract:
  Invenio is a free comprehensive web-based document repository and digital
library software suite originally developed at CERN. It can serve a variety of
use cases from an institutional repository or digital library to a web journal.
In order to fully use full-text documents for efficient search and ranking,
Solr was integrated into Invenio through a generic bridge. Solr indexes
extracted full-texts and most relevant metadata. Consequently, Invenio takes
advantage of Solr's efficient search and word similarity ranking capabilities.
In this paper, we first give an overview of Invenio, its capabilities and
features. We then present our open source Solr integration as well as
scalability challenges that arose for an Invenio-based multi-million record
repository: the CERN Document Server. We also compare our Solr adapter to an
alternative Xapian adapter using the same generic bridge. Both integrations are
distributed with the Invenio package and ready to be used by the institutions
using or adopting Invenio.


title: Building Programmable Wireless Networks: An Architectural Survey

abstract:
  In recent times, there have been a lot of efforts for improving the ossified
Internet architecture in a bid to sustain unstinted growth and innovation. A
major reason for the perceived architectural ossification is the lack of
ability to program the network as a system. This situation has resulted partly
from historical decisions in the original Internet design which emphasized
decentralized network operations through co-located data and control planes on
each network device. The situation for wireless networks is no different
resulting in a lot of complexity and a plethora of largely incompatible
wireless technologies. The emergence of "programmable wireless networks", that
allow greater flexibility, ease of management and configurability, is a step in
the right direction to overcome the aforementioned shortcomings of the wireless
networks. In this paper, we provide a broad overview of the architectures
proposed in literature for building programmable wireless networks focusing
primarily on three popular techniques, i.e., software defined networks,
cognitive radio networks, and virtualized networks. This survey is a
self-contained tutorial on these techniques and its applications. We also
discuss the opportunities and challenges in building next-generation
programmable wireless networks and identify open research issues and future
research directions.


title: Asymptotic behaviour of the Urbanik semigroup

abstract:
  We revisit the product convolution semigroup of probability densities
e_c(t),c>0 on the positive half-line with moments (n!)^c and determine the
asymptotic behaviour of e_c(t) for large and small t>0. This shows that (n!)^c
is indeterminate as Stieltjes moment sequence if and only if c>2


title: The excitation spectrum of rotating strings with masses at the ends

abstract:
  We compute the spectrum of excitations of the rotating Nambu-Goto string with
masses at the ends. We find interesting quasi-massless modes in the limit of
slow rotation and comment on the nontrivial relation between world-sheet and
target space energy.


title:
A chaotic decomposition for generalized stochastic processes with
  independent values

abstract:
  We extend the result of Nualart and Schoutens on chaotic decomposition of the
$L^2$-space of a L\'evy process to the case of a generalized stochastic
processes with independent values.


title: An Introduction to Topological Insulators

abstract:
  Electronic bands in crystals are described by an ensemble of Bloch wave
functions indexed by momenta defined in the first Brillouin Zone, and their
associated energies. In an insulator, an energy gap around the chemical
potential separates valence bands from conduction bands. The ensemble of
valence bands is then a well defined object, which can possess non-trivial or
twisted topological properties. In the case of a twisted topology, the
insulator is called a topological insulator. We introduce this notion of
topological order in insulators as an obstruction to define the Bloch wave
functions over the whole Brillouin Zone using a single phase convention.
Several simple historical models displaying a topological order in dimension
two are considered. Various expressions of the corresponding topological index
are finally discussed.


title: Stability by rescaled weak convergence for the Navier-Stokes equations

abstract:
  We prove a weak stability result for the three-dimensional homogeneous
incompressible Navier-Stokes system. More precisely, we investigate the
following problem : if a sequence $(u_{0, n})_{n\in \N}$ of initial data,
bounded in some scaling invariant space, converges weakly to an initial data
$u_0$ which generates a global regular solution, does $u_{0, n}$ generate a
global regular solution ? A positive answer in general to this question would
imply global regularity for any data, through the following examples $u_{0,n} =
n \vf_0(n\cdot)$ or $u_{0,n} = \vf_0(\cdot-x_n)$ with $|x_n|\to \infty$. We
therefore introduce a new concept of weak convergence (rescaled weak
convergence) under which we are able to give a positive answer. The proof
relies on profile decompositions in anisotropic spaces and their propagation by
the Navier-Stokes equations.


title:
A first look into the magnetic field configuration of prominence threads
  using spectropolarimetric data

abstract:
  We show preliminary results of an ongoing investigation aimed at determining
the configuration of the magnetic field vector in the threads of a quiescent
hedgerow solar prominence using high-spatial resolution spectropolarimetric
observations taken in the He I 1083.0 nm multiplet. The data consist of a
two-dimensional map of a quiescent hedgerow prominence showing vertical
threads. The observations were obtained with the Tenerife Infrared Polarimeter
attached to the German Vacuum Tower Telescope at the Observatorio del Teide
(Spain). The He I 1083.0 nm Stokes signals are interpreted with an inversion
code, which takes into account the key physical processes that generate and/or
modify circular and linear polarization signals in the He I 1083.0 nm triplet:
the Zeeman effect, anisotropic radiation pumping, and the Hanle effect. We
present initial results of the inversions, i.e, the strength and orientation of
the magnetic field vector along the prominence and in prominence threads.


title:
Temperature and Field Dependence of Magnetic Domains in
  La$_{1.2}$Sr$_{1.8}$Mn$_2$O$_7$

abstract:
  Colossal magnetoresistance and field-induced ferromagnetism are well
documented in manganite compounds. Since domain wall resistance contributes to
magnetoresistance, data on the temperature and magnetic field dependence of the
ferromagnetic domain structure are required for a full understanding of the
magnetoresistive effect. Here we show, using cryogenic Magnetic Force
Microscopy, domain structures for the layered manganite
La$_{1.2}$Sr$_{1.8}$Mn$_2$O$_7$ as a function of temperature and magnetic
field. Domain walls are suppressed close to the Curie temperature T$_C$, and
appear either via the application of a c-axis magnetic field, or by decreasing
the temperature further. At temperatures well below T$_C$, new domain walls,
stable at zero field, can be formed by the application of a c-axis field.
Magnetic structures are seen also at temperatures above T$_C$: these features
are attributed to inclusions of additional Ruddleston-Popper manganite phases.
Low-temperature domain walls are nucleated by these ferromagnetic inclusions.


title:
Simulation study on light ions identification methods for carbon beams
  from 95 to 400 MeV/A

abstract:
  Monte Carlo simulations have been performed in order to evaluate the
efficiencies of several light ions identification techniques. The detection
system was composed with layers of scintillating material to measure either the
deposited energy or the time-of-flight of ions produced by nuclear reactions
between 12C projectiles and a PMMA target. Well known techniques such as
(DELTA) E--Range, (DELTA) E--E--ToF and (DELTA)E--E are presented and their
particle identification efficiencies are compared one to another regarding the
generated charge and mass of the particle to be identified. The simulations
allowed to change the beam energy matching the ones proposed in an hadron
therapy facility, namely from 95 to 400 MeV/A.


title: Modeling with Normalized Random Measure Mixture Models

abstract:
  The Dirichlet process mixture model and more general mixtures based on
discrete random probability measures have been shown to be flexible and
accurate models for density estimation and clustering. The goal of this paper
is to illustrate the use of normalized random measures as mixing measures in
nonparametric hierarchical mixture models and point out how possible
computational issues can be successfully addressed. To this end, we first
provide a concise and accessible introduction to normalized random measures
with independent increments. Then, we explain in detail a particular way of
sampling from the posterior using the Ferguson-Klass representation. We develop
a thorough comparative analysis for location-scale mixtures that considers a
set of alternatives for the mixture kernel and for the nonparametric component.
Simulation results indicate that normalized random measure mixtures potentially
represent a valid default choice for density estimation problems. As a
byproduct of this study an R package to fit these models was produced and is
available in the Comprehensive R Archive Network (CRAN).


title: Observations and predictions at CesrTA, and outlook for ILC

abstract:
  In this paper, we will describe some of the recent experimental measurements
[1, 2, 3] performed at CESRTA [4], and the supporting simulations, which probe
the interaction of the electron cloud with the stored beam. These experiments
have been done over a wide range of beam energies, emittances, bunch currents,
and fill patterns, to gather sufficient information to be able to fully
characterize the beam-electron-cloud interaction and validate the simulation
programs. The range of beam conditions is chosen to be as close as possible to
those of the ILC damping ring, so that the validated simulation programs can be
used to predict the performance of these rings with regard to electroncloud-
related phenomena. Using the new simulation code Synrad3D to simulate the
synchrotron radiation environment, a vacuum chamber design has been developed
for the ILC damping ring which achieves the required level of photoelectron
suppression. To determine the expected electron cloud density in the ring, EC
buildup simulations have been done based on the simulated radiation environment
and on the expected performance of the ILC damping ring chamber mitigation
prescriptions. The expected density has been compared with analytical estimates
of the instability threshold, to verify that the ILC damping ring vacuum
chamber design is adequate to suppress the electron cloud single-bunch
head-tail instability.


title:
General N = 2 Supersymmetric Quantum Mechanical Model: Supervariable
  Approach to its Off-Shell Nilpotent Symmetries

abstract:
  Using the supersymmetric (SUSY) invariant restrictions on the (anti-)chiral
supervariables, we derive the off-shell nilpotent symmetries of the general one
(0 + 1)-dimensional N = 2 SUSY quantum mechanical (QM) model which is
considered on a (1, 2)-dimensional supermanifold (parametrized by a bosonic
variable t and a pair of Grassmannian variables \theta and \bar\theta with
\theta^2 = \bar\theta^2 = 0, \theta\bar\theta + \bar\theta\theta = 0). We
provide the geometrical meanings to the two SUSY transformations of our present
theory which are valid for any arbitrary type of superpotential. We express the
conserved charges and Lagrangian of the theory in terms of the supervariables
(that are obtained after the application of SUSY invariant restrictions) and
provide the geometrical interpretation for the nilpotency property and SUSY
invariance of the Lagrangian for the general N = 2 SUSY quantum theory. We also
comment on the mathematical interpretation of the above symmetry
transformations.


title: Type refinement and monoidal closed bifibrations

abstract:
  The concept of_refinement_ in type theory is a way of reconciling the
"intrinsic" and the "extrinsic" meanings of types. We begin with a rigorous
analysis of this concept, settling on the simple conclusion that the
type-theoretic notion of "type refinement system" may be identified with the
category-theoretic notion of "functor". We then use this correspondence to give
an equivalent type-theoretic formulation of Grothendieck's definition of
(bi)fibration, and extend this to a definition of_monoidal closed
bifibrations_, which we see as a natural space in which to study the properties
of proofs and programs. Our main result is a representation theorem for strong
monads on a monoidal closed fibration, describing sufficient conditions for a
monad to be isomorphic to a continuations monad "up to pullback".


title: RATS-Kepler -- a deep high cadence survey of the Kepler field

abstract:
  We outline the purpose, strategy and first results of a deep, high cadence,
photometric survey of the Kepler field using the Isaac Newton Telescope on La
Palma and the MDM 1.3m Telescope on Kitt Peak. Our goal was to identify sources
located in the Kepler field of view which are variable on a timescale of a few
mins to 1 hour. The astrophysically most interesting sources would then have
been candidates for observation using Kepler using 1 min sampling. Our survey
covered ~42% of the Kepler field of view and we have obtained light curves for
7.1x10^5 objects in the range 13<g<20. We have discovered more than 100
variable sources which have passed our two stage identification process. As a
service to the wider community, we make our data products and cleaned CCD
images available to download. We obtained Kepler data of 18 sources which we
found to be variable using our survey and we give an overview of the currently
available data here. These sources include a pulsating DA white dwarf, eleven
delta Sct stars which have dominant pulsation periods in the range 24 min to
2.35 hrs, three contact binaries, and a cataclysmic variable (V363 Lyr). One of
the delta Sct stars is in a contact binary.


title:
On neutrinoless double beta decay in the minimal left-right symmetric
  model

abstract:
  We analyze the general phenomenology of neutrinoless double beta decay in the
minimal left-right symmetric model. We study under which conditions a New
Physics dominated neutrinoless double beta decay signal can be expected in the
future experiments. We show that the correlation among the different
contributions to the process, which arises from the neutrino mass generation
mechanism, can play a crucial role. We have found that, if no fine tuned
cancellation is involved in the light active neutrino contribution, a New
Physics signal can be expected mainly from the $W_R-W_R$ channel. An
interesting exception is the $W_L-W_R$ channel which can give a dominant
contribution to the process if the right-handed neutrino spectrum is
hierarchical with $M_1\lesssim$ MeV and $M_2,M_3\gtrsim$ GeV. We also discuss
if a New Physics signal in neutrinoless double beta decay experiments is
compatible with the existence of a successful Dark Matter candidate in the
left-right symmetric models. It turns out that, although it is not a generic
feature of the theory, it is still possible to accommodate such a signal with a
KeV sterile neutrino as Dark matter.


title:
Composite analysis with Monte Carlo methods: an example with cosmic rays
  and clouds

abstract:
  The composite (superposed epoch) analysis technique has been frequently
employed to examine a hypothesized link between solar activity and the Earth's
atmosphere, often through an investigation of Forbush decrease (Fd) events
(sudden high-magnitude decreases in the flux cosmic rays impinging on the
upper-atmosphere lasting up to several days). This technique is useful for
isolating low-amplitude signals within data where background variability would
otherwise obscure detection. The application of composite analyses to
investigate the possible impacts of Fd events involves a statistical
examination of time-dependent atmospheric responses to Fds often from aerosol
and/or cloud datasets. Despite the publication of numerous results within this
field, clear conclusions have yet to be drawn and much ambiguity and
disagreement still remain. In this paper, we argue that the conflicting
findings of composite studies within this field relate to methodological
differences in the manner in which the composites have been constructed and
analyzed. Working from an example, we show how a composite may be objectively
constructed to maximize signal detection, robustly identify statistical
significance, and quantify the lower-limit uncertainty related to hypothesis
testing. Additionally, we also demonstrate how a seemingly significant false
positive may be obtained from non-significant data by minor alterations to
methodological approaches.


title: Aperiodicity in equilibrium systems: Between order and disorder

abstract:
  Spatial aperiodicity occurs in various models and material s. Although today
the most well-known examples occur in the area of quasicrystals, other
applications might also be of interest. Here we discuss some issues related to
the notion and occurrence of aperiodic order in equilibrium statistical
mechanics. In particular, we consider some spectral characterisations,and
shortly review what is known about the occurrence of aperiodic order in lattice
models at zero and non-zero temperatures. At the end some more speculative
connections to the theory of (spin-)glasses are indicated.


title: Multi-component generalization of Camassa-Holm equation

abstract:
  In this paper, we propose a multi-component system of Camassa-Holm equation,
denoted by CH($N$,$H$) with 2N components and an arbitrary smooth function $H$.
This system is shown to admit Lax pair and infinitely many conservation laws.
We particularly study the case of N=2 and derive the bi-Hamiltonian structures
and peaked soliton (peakon) solutions for some examples.


title:
Creation and dynamics of two-dimensional skyrmions in antiferromagnetic
  spin-1 Bose-Einstein condensates

abstract:
  We numerically simulate the creation process of two-dimensional skyrmionic
excitations in antiferromagnetic spin-1 Bose--Einstein condensates by solving
the full three-dimensional dynamics of the system from the Gross--Pitaevskii
equation. Our simulations reproduce quantitatively the experimental results of
[Choi et al., Phys. Rev. Lett. 108, 035301 (2012)] without any fitting
parameters. Furthermore, we examine the stability of the skyrmion by computing
the temporal evolution of the condensate in a harmonic potential. The presence
of both the quadratic Zeeman effect and dissipation in the simulations is vital
for reproducing the experimentally observed decay time.


title: An X-ray view of quasars

abstract:
  I present an overview of observational studies of quasars of all types, with
particular emphasis on X-ray observational studies. The presentation is based
on the most popularly accepted unified picture of quasars - collectively
referred to as AGN (active galactic nuclei) in this review. Characteristics of
X-ray spectra and X-ray variability obtained from various X-ray satellites over
the last 5 decades have been presented and discussed. The contribution of AGN
in understanding the cosmic X-ray background is discussed very briefly. Attempt
has been made to provide up-to-date information; however, this is a vast
subject and this presentation is not intended to be comprehensive.


title: Probing quantum confinement within single core-multishell nanowires

abstract:
  Theoretically core-multishell nanowires under a cross-section of hexagonal
geometry should exhibit peculiar confinement effects. Using a hard X-ray
nanobeam, here we show experimental evidence for carrier localization phenomena
at the hexagon corners by combining synchrotron excited optical luminescence
with simultaneous X-ray fluorescence spectroscopy. Applied to single coaxial
n-GaN/InGaN multiquantum-well/p-GaN nanowires, our experiment narrows the gap
between optical microscopy and high-resolution X-ray imaging, and calls for
further studies on the underlying mechanisms of optoelectronic nanodevices.


title:
A low-luminosity type-1 QSO sample: I. Overluminous host spheroidals or
  undermassive black holes?

abstract:
  Recognizing the properties of the host galaxies of quasi-stellar objects
(QSOs) is essential to understand the suspected coevolution of central
supermassive black holes (BHs) and their host galaxies. We selected a subsample
of the Hamburg/ESO survey for bright UV-excess QSOs, containing only the 99
nearest QSOs with redshift z<=0.06, that are close enough to allow detailed
structural analysis. From this "low-luminosity type-1 QSO sample", we observed
20 galaxies and performed aperture photometry and
bulge-disk-bar-AGN-decomposition with BUDDA on near-infrared J, H, K band
images. From the photometric decomposition of these 20 objects and visual
inspection of images of another 26, we find that ~50% of the hosts are disk
galaxies and most of them (86%) are barred. Stellar masses, calculated from
parametric models based on inactive galaxy colors, range from 2x10^9 M_sun to
2x10^11 M_sun. Black hole masses measured from single epoch spectroscopy range
from 1x10^6 M_sun to 5x10^8 M_sun. In comparison to higher luminosity QSO
samples, LLQSOs tend to have lower stellar and BH masses. Also, in the
effective radius vs. mean surface-brightness projection of the fundamental
plane, they lie in the transition area between luminous QSOs and "normal"
galaxies. This can be seen as further evidence that they can be pictured as a
"bridge" between the local Seyfert population and luminous QSOs at higher
redshift. Eleven low-luminosity QSOs for which we have reliable morphological
decompositions and BH mass estimations lie below the published BH mass vs.
bulge luminosity relations for inactive galaxies. This could be partially
explained by bulges of active galaxies containing much younger stellar
populations than bulges of inactive galaxies. Also, one could suspect that
their BHs are undermassive. This might hint at the growth of the host spheroid
to precede that of the BH.


title:
Analysis of transverse Anderson localization in refractive index
  structures with customized random potential

abstract:
  We present a method to demonstrate Anderson localization in an optically
induced randomized potential. By usage of computer controlled spatial light
modulators, we are able to implement fully randomized nondiffracting beams of
variable structural size in order to control the modulation length (photonic
grain size) as well as the depth (disorder strength) of a random potential
induced in a photorefractive crystal. In particular, we quantitatively analyze
the localization length of light depending on these two parameters and find
that they are crucial influencing factors on the propagation behavior leading
to variably strong localization. Thus, we corroborate that transverse light
localization in a random refractive index landscape strongly depends on the
character of the potential, allowing for a flexible regulation of the
localization strength by adapting the optical induction configuration.


title: FormCalc 8: Better Algebra and Vectorization

abstract:
  We present Version 8 of the Feynman-diagram calculator FormCalc. New features
include in particular significantly improved algebraic simplification as well
as vectorization of the generated code. The Cuba Library, used in FormCalc,
features checkpointing to disk for all integration algorithms.


title:
Optimal exact tests for composite alternative hypotheses on cross
  tabulated data

abstract:
  We present methodology for constructing exact significance tests for cross
tabulated data for "difficult" composite alternative hypotheses that have no
natural test statistic. We construct a test for discovering Simpson's Paradox
and a general test for discovering positive dependence between two ordinal
variables. Our tests are Bayesian extensions of the likelihood ratio test, they
are optimal with respect to the prior distribution, and are also closely
related to Bayes factors and Bayesian FDR controlling testing procedures.


title:
Friction due to inhomogeneous driving of coupled spins in a quantum heat
  engine

abstract:
  We consider two spin-1/2 particles with isotropic Heisenberg interaction, as
the working substance of a quantum heat engine. We observe a frictional effect
on the adiabatic branches of the heat cycle, which arises due to an
inhomogeneous driving at a finite rate of the external magnetic field. The
frictional effect is characterized by entropy production in the system and
reduction in the work extracted. Corresponding to a sudden and a very slow
driving, we find expressions for the lower and upper bounds of work that can be
extracted on the adiabatic branches. These bounds are also confirmed with
numerical simulations of the corresponding Liouville-von Neumann equation.


title:
Magnetocaloric effect in the spin-1/2 Ising-Heisenberg diamond chain
  with the four-spin interaction

abstract:
  The magnetocaloric effect in the symmetric spin-1/2 Ising-Heisenberg diamond
chain with the Ising four-spin interaction is investigated using the
generalized decoration-iteration mapping transformation and the transfer-matrix
technique. The entropy and the Gruneisen parameter, which closely relate to the
magnetocaloric effect, are exactly calculated to compare the capability of the
system to cool in the vicinity of different field-induced ground-state phase
transitions during the adiabatic demagnetization.


title:
Interplay between Point-Group Symmetries and the Choice of the Bloch
  Basis in Multiband Models

abstract:
  We analyze the point-group symmetries of generic multiband tight-binding
models with respect to the transformation properties of the effective
interactions. While the vertex functions in the orbital language may transform
non-trivially under point-group operations, their point-group behavior in the
band language can be simplified by choosing a suitable Bloch basis.We first
give two analytically accessible examples. Then we show that, for a large class
of models, a natural Bloch basis exists, in which the vertex functions in the
band language transform trivially under all point-group operations. As a
consequence, the point-group symmetries can be used to reduce the computational
effort in perturbative many-particle approaches such as the functional
renormalization group.


title: Specializations of nonsymmetric Macdonald-Koornwinder polynomials

abstract:
  This work records the details of the Ram-Yip formula for nonsymmetric
Macdonald-Koornwinder polynomials for the double affine Hecke algebras of
not-necessarily-reduced affine root systems. It is shown that the t=0
equal-parameter specialization of nonsymmetric Macdonald polynomials admits an
explicit combinatorial formula in terms of quantum alcove paths, generalizing
the formula of Lenart in the untwisted case. In particular our formula yields a
definition of quantum Bruhat graph for all affine root systems. For mixed type
the proof requires the Ram-Yip formula for the nonsymmetric Koornwinder
polynomials. A quantum alcove path formula is also given for the limit at t
equal to infinity. As a consequence we establish the positivity of the
coefficients of nonsymmetric Macdonald polynomials under this limit, as
conjectured by Cherednik and the first author. Finally, an explicit formula is
given at q equal to infinity, which yields the p-adic Iwahori-Whittaker
functions of Brubaker, Bump, and Licata.


title: New results on XYZ states from e+e- experiments

abstract:
  In this talk, we present the recent study on the charmoniumlike states from
the e^+e^- colliders, including BESIII, Belle, BaBar, and CLEOc. The talk
covers the X(3872) from the Y(4260) radiative transition, the Y states from the
initial-state-radiation processes and from e+e- to pi+pi-h_c, and the charged
Z_c states.


title:
Breathing mode in the Bose-Hubbard chain with a harmonic trapping
  potential

abstract:
  We investigate the breathing mode of harmonically trapped bosons in an
optical lattice at small site occupancies. The Bose-Hubbard model with a
trapping potential is used to describe the breathing-mode dynamics initiated
through weak quenches of the trap strength. We connect to results for continuum
bosons (Lieb-Liniger and Gross-Pitaevskii results) and also present deviations
from continuum physics. We take a spectral perspective, identifying the
breathing mode frequency with a particular energy gap in the spectrum of the
trapped Bose-Hubbard Hamiltonian. We present the low energy eigenspectrum of
the trapped many-boson system, and study overlaps of the initial state with
eigenstates of the quenched Hamiltonian. There is an intermediate interaction
regime, between a "free-boson" limit and a "free-fermion" limit, in which the
Bose-Hubbard breathing mode frequency approaches the Gross-Pitaevskii
prediction. In addition, we present a striking failure of the time-dependent
Gutzwiller approximation for describing breathing modes.


title:
Uncovering patterns of inter-urban trip and spatial interaction from
  social media check-in data

abstract:
  The article revisits spatial interaction and distance decay from the
perspective of human mobility patterns and spatially-embedded networks based on
an empirical data set. We extract nationwide inter-urban movements in China
from a check-in data set that covers half million individuals and 370 cities to
analyze the underlying patterns of trips and spatial interactions. By fitting
the gravity model, we find that the observed spatial interactions are governed
by a power law distance decay effect. The obtained gravity model also well
reproduces the exponential trip displacement distribution. However, due to the
ecological fallacy issue, the movement of an individual may not obey the same
distance decay effect. We also construct a spatial network where the edge
weights denote the interaction strengths. The communities detected from the
network are spatially connected and roughly consistent with province
boundaries. We attribute this pattern to different distance decay parameters
between intra-province and inter-province trips.


title: Quantum Hydrodynamics

abstract:
  Quantum plasma physics is a rapidly evolving research field with a very
inter-disciplinary scope of potential applications, ranging from nano-scale
science in condensed matter to the vast scales of astrophysical objects. The
theoretical description of quantum plasmas relies on various approaches,
microscopic or macroscopic, some of which have obvious relation to classical
plasma models. The appropriate model should, in principle, incorporate the
quantum mechanical effects such as diffraction, spin statistics and
correlations, operative on the relevant scales. However, first-principle
approaches such as quantum Monte Carlo and density functional theory or
quantum-statistical methods such as quantum kinetic theory or non-equilibrium
Green's functions require substantial theoretical and computational efforts.
Therefore, for selected problems, alternative simpler methods have been put
forward. In particular, the collective behavior of many-body systems is usually
described within a self-consistent scheme of particles and fields on the
mean-field level. In classical plasmas, further simplifications are achieved by
a transition to hydrodynamic equations. % Similar fluid-type descriptions for
quantum plasmas have been proposed and widely used in the recent decade. This
chapter is devoted to an overview of the main concepts of quantum hydrodynamics
(QHD), thereby critically analyzing its validity range and its main
limitations. Furthermore, the results of the linearized QHD in unmagnetized and
magnetized plasmas and a few nonlinear solutions are examined with
illustrations. The basic concepts and formulation of particle-particle
interactions are also reviewed at the end, indicating their possible
consequences in quantum many-body problems.


title:
Causal structures from entropic information: Geometry and novel
  scenarios

abstract:
  The fields of quantum non-locality in physics, and causal discovery in
machine learning, both face the problem of deciding whether observed data is
compatible with a presumed causal relationship between the variables (for
example a local hidden variable model). Traditionally, Bell inequalities have
been used to describe the restrictions imposed by causal structures on marginal
distributions. However, some structures give rise to non-convex constraints on
the accessible data, and it has recently been noted that linear inequalities on
the observable entropies capture these situations more naturally. In this
paper, we show the versatility of the entropic approach by greatly expanding
the set of scenarios for which entropic constraints are known. For the first
time, we treat Bell scenarios involving multiple parties and multiple
observables per party. Going beyond the usual Bell setup, we exhibit
inequalities for scenarios with extra conditional independence assumptions, as
well as a limited amount of shared randomness between the parties. Many of our
results are based on a geometric observation: Bell polytopes for two-outcome
measurements can be naturally imbedded into the convex cone of attainable
marginal entropies. Thus, any entropic inequality can be translated into one
valid for probabilities. In some situations the converse also holds, which
provides us with a rich source of candidate entropic inequalities.


title: Associative subalgebras of low-dimensional Majorana algebras

abstract:
  A Majorana algebra is a commutative nonassociative real algebra generated by
a finite set of idempotents, called Majorana axes, that satisfy some of the
properties of the $2A$-axes of the Monster Griess algebra. The term was
introduced by A. A. Ivanov in 2009 inspired by the work of S. Sakuma and M.
Miyamoto. In the present paper, we revisit Mayer and Neutsch's theorem on
associative subalgebras of the Griess algebra in the context of Majorana
theory. We apply this result to determine all the maximal associative
subalgebras of some low-dimensional Majorana algebras; namely, the Majorana
algebras generated by two Majorana axes and the Majorana representations of the
symmetric group of degree $4$ involving $3C$-algebras.


title: Manifestation of the spin textures in the thermopower of MnSi

abstract:
  To identify possible spin texture contributions to thermoelectric transport,
we present a detailed temperature and pressure dependence of thermopower $S$ in
MnSi, as well as a low-temperature study of $S$ in a magnetic field. We find
that $S/T$ reconstructs the $(p,T)$ phase diagram of MnSi encompassing the
Fermi liquid, partially ordered, and non-Fermi liquid phases. Our results
indicate that the latter two phases have essentially the same nature. In the
partially ordered phase, $S(T)$ is strongly enhanced, which may be understood
as a spiral-fluctuation-driven phase. A low temperature upturn in $S/T$
pertaining to the partial order phase persists up to the highest pressure, 24
kbar. Contrarily, a small suppression of $S(T)$ is observed in the ordered
skyrmion lattice $A$ phase.


title: Time-Resonant Tokamak Plasma Edge Instabilities?

abstract:
  For a two week period during the Joint European Torus (JET) 2012 experimental
campaign, the same high confinement plasma was repeated 151 times. The dataset
was analysed to produce a probability density function (pdf) for the waiting
times between edge-localised plasma instabilities ("ELMS"). The result was
entirely unexpected. Instead of a smooth single peaked pdf, a succession of 4-5
sharp maxima and minima uniformly separated by 7-8 millisecond intervals was
found. Here we explore the causes of this newly observed phenomenon, and
conclude that it is either due to a self-organised plasma phenomenon or an
interaction between the plasma and a real-time control system. If the maxima
are a result of "resonant" frequencies at which ELMs can be triggered more
easily, then future ELM control techniques can, and probably will, use them.
Either way, these results demand a deeper understanding of the ELMing process.


title:
An improved measurement of direct CP violation parameters in B^pm ->
  J/psi K^pm and B^pm -> J/psi pi^pm decays

abstract:
  We present a measurement of the direct CP-violating charge asymmetry in B^pm
mesons decaying to J/psi K^pm and J/psi pi^pm where J/psi decays to mu^+ mu^-,
using 10.4 fb$^-1 of proton-antiproton collisions collected by the D0 detector
during Run II at the Fermilab Tevatron Collider. A difference in the yield of
B^- and B^+ mesons in these decays is found by fitting to the difference
between their reconstructed invariant mass distributions resulting in
asymmetries of ajpk =[ 0.59 \pm 0.36 ]%, which is the most precise measurement
to date, and ajppi= [ -4.2 \pm 4.8 ]%.Both measurements are consistent with
standard model predictions. These measurements are combined with all previous
measurements to form new world averages of \ajpk\ and \ajppi .


title: Charge Asymmetries in Semileptonic B Decays

abstract:
  I present measurements made by the D0 collaboration of the time-integrated
flavor-specific semileptonic charge asymmetry in the decays of the Bs and Bd
mesons that have undergone flavor mixing, asls and asld, using 10.4 fb^-1 of
proton-antiproton collisions collected by the D0 detector during Run II at the
Fermilab Tevatron Collider. The results are asls = [-1.12 \pm 0.74 (stat) \pm
0.17 (syst) ]% and asld = [0.68 \pm 0.45 (stat.) \pm 0.14 (syst.)]% which are
the two most precise published results and are in agreement with standard model
predictions. These results are combined with the like-sign dimuon charge
asymmetry, aslb, and recent preliminary results from the LHCb and BaBar
experiments to obtain new world averages.


title:
High Energy Hadron Colliders - Report of the Snowmass 2013 Frontier
  Capabilities Hadron Collider Study Group

abstract:
  High energy hadron colliders have been the tools for discovery at the highest
mass scales of the energy frontier from the SppS, to the Tevatron and now the
LHC. This report reviews future hadron collider projects from the high
luminosity LHC upgrade to a 100 TeV hadron collider in a large tunnel, the
underlying technology challenges and R&D directions and presents a series of
recommendations for the future development of hadron collider research and
technology.


title: Mismatched Quantum Filtering and Entropic Information

abstract:
  Quantum filtering is a signal processing technique that estimates the
posterior state of a quantum system under continuous measurements and has
become a standard tool in quantum information processing, with applications in
quantum state preparation, quantum metrology, and quantum control. If the
filter assumes a nominal model that differs from reality, however, the
estimation accuracy is bound to suffer. Here I derive identities that relate
the excess error caused by quantum filter mismatch to the relative entropy
between the true and nominal observation probability measures, with one
identity for Gaussian measurements, such as optical homodyne detection, and
another for Poissonian measurements, such as photon counting. These identities
generalize recent seminal results in classical information theory and provide
new operational meanings to relative entropy, mutual information, and channel
capacity in the context of quantum experiments.


title:
Sensitivity of LHC experiments to the $t\bar{t}H$ final state, with $H
  \rightarrow b\bar{b}$, at center of mass energy of 14 TeV

abstract:
  With the discovery of a Higgs-like particle in 2012, attention has now turned
to measuring its properties, e.g., coupling to various bosonic and fermionic
final states, its spin and parity, etc. In this note, we study the sensitivity
of experiments at the LHC to its coupling to the top quark, by searching for
the process pp $\rightarrow t\bar{t}H$, where the primary decay mode of the $H$
is $\rightarrow b\bar{b}$. In this paper, the $t\bar{t}$ system is detected in
the dilepton final state. This study is performed assuming a center of mass
energy of 14 TeV and integrated luminosities of 300 fb$^{-1}$ (with an average
pileup ($\mu$) of 50 additional collisions per bunch crossing) and 3000
fb$^{-1}$ (with $\mu=140$). We include systematic uncertainties in production
cross-sections as well as the more important experimental uncertainties.
Preliminary studies indicate that we will observe the $t\bar{t}H$ final state
with a significance of 2.4 and $\ge 5.3$ for the two luminosity scenarios,
respectively; addition of other $t\bar{t}$ final states should increase the
overall significance for observing $t\bar{t}H$.


title: Periodic structures in binary mixtures enforced by Janus particles

abstract:
  Phase separation in binary mixtures in the presence of Janus particles has
been studied in terms of a Cahn-Hilliard model coupled to the Langevin
equations describing the particle dynamics. We demonstrate that the phase
separation process is arrested leading to unexpected regular stripe patterns in
the concentration field. The underlying pattern forming mechanism has been
elucidated: The twofold absorption properties on the surface of Janus particles
with respect to the two components of a binary mixture trigger in their
neighborhood spatial concentration variations. They result in an effective
interaction between the particles mediated by the binary mixture. Our findings
open a route to design composite materials with nanoscale lamellar morphologies
where the pattern wavelength can be tuned by changing the wetting properties of
the Janus particles.


title:
An observational asteroseismic study of the pulsating B-stars in the
  open cluster NGC 884

abstract:
  Recent progress in the seismic interpretation of field {\beta} Cep stars has
resulted in improvements of the physical description in the stellar structure
and evolution model computations of massive stars. Further asteroseismic
constraints can be obtained from studying ensembles of stars in a young open
cluster, which all have similar age, distance and chemical composition. We
present an observational asteroseismic study based on the discovery of numerous
multi-periodic and mono-periodic B-stars in the open cluster NGC 884. Our study
illustrates the current status of ensemble asteroseismology of a young open
cluster.


title:
Some consequences of a Universal Tension arising from Dark Energy for
  structures from Atomic Nuclei to Galaxy Clusters

abstract:
  In recent work, a new cosmological paradigm implied a mass-radius relation,
suggesting a universal tension related to the background dark energy
(cosmological constant), leading to an energy per unit area that holds for
structures from atomic nuclei to clusters of galaxies. Here we explore some of
the consequences that arise from such a universal tension.


title:
Tracking Control for FES-Cycling based on Force Direction Efficiency
  with Antagonistic Bi-Articular Muscles

abstract:
  A functional electrical stimulation (FES)-based tracking controller is
developed to enable cycling based on a strategy to yield force direction
efficiency by exploiting antagonistic bi-articular muscles. Given the input
redundancy naturally occurring among multiple muscle groups, the force
direction at the pedal is explicitly determined as a means to improve the
efficiency of cycling. A model of a stationary cycle and rider is developed as
a closed-chain mechanism. A strategy is then developed to switch between muscle
groups for improved efficiency based on the force direction of each muscle
group. Stability of the developed controller is analyzed through Lyapunov-based
methods.


title: Sampling generalized cat states with linear optics is probably hard

abstract:
  Boson-sampling has been presented as a simplified model for linear optical
quantum computing. In the boson-sampling model, Fock states are passed through
a linear optics network and sampled via number-resolved photodetection. It has
been shown that this sampling problem likely cannot be efficiently classically
simulated. This raises the question as to whether there are other quantum
states of light for which the equivalent sampling problem is also
computationally hard. We present evidence, without using a full complexity
proof, that a very broad class of quantum states of light --- arbitrary
superpositions of two or more coherent states --- when evolved via passive
linear optics and sampled with number-resolved photodetection, likely
implements a classically hard sampling problem.


title: Simple heteroclinic cycles in R^4

abstract:
  In generic dynamical systems heteroclinic cycles are invariant sets of
codimension at least one, but they can be structurally stable in systems which
are equivariant under the action of a symmetry group, due to the existence of
flow-invariant subspaces. For dynamical systems in R^n the minimal dimension
for which such robust heteroclinic cycles can exist is n=3. In this case the
list of admissible symmetry groups is short and well-known. The situation is
different and more interesting when n=4. In this paper we list all finite
groups Gamma such that an open set of smooth Gamma-equivariant dynamical
systems in R^4 possess a very simple heteroclinic cycle (a structurally stable
heteroclinic cycle satisfying certain additional constraints). This work
extends the results which were obtained by Sottocornola in the case when all
equilibria in the heteroclinic cycle belong to the same Gamma-orbit (in this
case one speaks of homoclinic cycles).


title:
Fourier-Mukai Transforms and Bridgeland Stability Conditions on Abelian
  Threefolds II

abstract:
  We show that the conjectural construction proposed by Bayer, Bertram, Macr\'i
and Toda gives rise to Bridgeland stability conditions for a principally
polarized abelian three-fold with Picard rank one by proving that tilt stable
objects satisfy the strong Bogomolov-Gieseker type inequality. This is done by
showing any Fourier-Mukai transform gives an equivalence of abelian categories
which are double tilts of coherent sheaves.


title: Stability of black holes and solitons in Anti-de Sitter space-time

abstract:
  The stability of black holes and solitons in d-dimensional Anti-de Sitter
space-time against scalar field condensation is discussed. The resulting
solutions are "hairy" black holes and solitons, respectively. In particular, we
will discuss static black hole solutions with hyperbolic, flat and spherical
horizon topology and emphasize that two different type of instabilities exist
depending on whether the scalar field is charged or uncharged, respectively. We
will also discuss the influence of Gauss-Bonnet curvature terms. The results
have applications within the AdS/CFT correspondence and describe e.g.
holographic insulator/conductor/superconductor phase transitions.


title: Reinforced Brownian Motion on the Half-Line

abstract:
  We analyze the Brownian Motion limit of a prototypical unit step reinforced
random-walk on the half line. A reinforced random walk is one which changes the
weight of any edge (or vertex) visited to increase the frequency of return
visits. The generating function for the discrete case is first derived for the
joint probability distribution of $S_N$ (the location of the walker at the
$N$^{th}$ step) and $A_N$ the maximum location the walker achieved in $N$
steps. Then the bulk of the analysis concerns the statistics of the limiting
Brownian walker, and of its "environment", both parametrized by the amplitude
of the reinforcement.


title: Surface Registration Using Genetic Algorithm in Reduced Search Space

abstract:
  Surface registration is a technique that is used in various areas such as
object recognition and 3D model reconstruction. Problem of surface registration
can be analyzed as an optimization problem of seeking a rigid motion between
two different views. Genetic algorithms can be used for solving this
optimization problem, both for obtaining the robust parameter estimation and
for its fine-tuning. The main drawback of genetic algorithms is that they are
time consuming which makes them unsuitable for online applications. Modern
acquisition systems enable the implementation of the solutions that would
immediately give the information on the rotational angles between the different
views, thus reducing the dimension of the optimization problem. The paper gives
an analysis of the genetic algorithm implemented in the conditions when the
rotation matrix is known and a comparison of these results with results when
this information is not available.


title: Predictive Model of Radiative Neutrino Masses

abstract:
  We present a simple and predictive model of radiative neutrino masses. It is
a special case of the Zee model which introduces two Higgs doublets and a
charged singlet. We impose a family-dependent Z_4 symmetry acting on the
leptons, which reduces the number of parameters describing neutrino
oscillations to four. A variety of predictions follow: The hierarchy of
neutrino masses must be inverted; the lightest neutrino mass is extremely small
and calculable; one of the neutrino mixing angles is determined in terms of the
other two; the phase parameters take CP-conserving values with \delta_{CP} =
\pi; and the effective mass in neutrinoless double beta decay lies in a narrow
range, m_{\beta \beta} = (17.6 - 18.5) meV. The ratio of vacuum expectation
values of the two Higgs doublets, tan\beta, is determined to be either 1.9 or
0.19 from neutrino oscillation data. Flavor-conserving and flavor-changing
couplings of the Higgs doublets are also determined from neutrino data. The
non-standard neutral Higgs bosons, if they are moderately heavy, decay
dominantly into \mu and \tau with prescribed branching ratios. Observable rates
for the decays \mu \to e \gamma and \tau \to 3\mu are predicted if these
scalars have masses in the range of 150-500 GeV.


title: Cheeger constant, $p$-Laplacian, and Gromov-Hausdorff convergence

abstract:
  We discuss the behavior of $(\lambda_{1. p}(M))^{1/p}$ with respect to the
Gromov-Hausdorff topology and the variable $p$, where $\lambda_{1, p}(M)$ is
the first positive eigenvalue of the $p$-Laplacian on a compact Riemannian
manifold $M$. Applications include new estimates for the first eigenvalues of
the $p$-Laplacian on Riemannian manifolds with lower Ricci curvature bounds,
and isoperimetric inequalities on Gromov-Hausdorff limit spaces. We also
establish a new Lichnerowicz-Obata type theorem.


title:
Filtering for More Accurate Dense Tissue Segmentation in Digitized
  Mammograms

abstract:
  Breast tissue segmentation into dense and fat tissue is important for
determining the breast density in mammograms. Knowing the breast density is
important both in diagnostic and computer-aided detection applications. There
are many different ways to express the density of a breast and good quality
segmentation should provide the possibility to perform accurate classification
no matter which classification rule is being used. Knowing the right breast
density and having the knowledge of changes in the breast density could give a
hint of a process which started to happen within a patient. Mammograms
generally suffer from a problem of different tissue overlapping which results
in the possibility of inaccurate detection of tissue types. Fibroglandular
tissue presents rather high attenuation of X-rays and is visible as brighter in
the resulting image but overlapping fibrous tissue and blood vessels could
easily be replaced with fibroglandular tissue in automatic segmentation
algorithms. Small blood vessels and microcalcifications are also shown as
bright objects with similar intensities as dense tissue but do have some
properties which makes possible to suppress them from the final results. In
this paper we try to divide dense and fat tissue by suppressing the scattered
structures which do not represent glandular or dense tissue in order to divide
mammograms more accurately in the two major tissue types. For suppressing blood
vessels and microcalcifications we have used Gabor filters of different size
and orientation and a combination of morphological operations on filtered image
with enhanced contrast.


title: Flexible Visual Quality Inspection in Discrete Manufacturing

abstract:
  Most visual quality inspections in discrete manufacturing are composed of
length, surface, angle or intensity measurements. Those are implemented as
end-user configurable inspection tools that should not require an image
processing expert to set up. Currently available software solutions providing
such capability use a flowchart based programming environment, but do not fully
address an inspection flowchart robustness and can require a redefinition of
the flowchart if a small variation is introduced. In this paper we propose an
acquire-register-analyze image processing pattern designed for discrete
manufacturing that aims to increase the robustness of the inspection flowchart
by consistently addressing variations in product position, orientation and
size. A proposed pattern is transparent to the end-user and simplifies the
flowchart. We describe a developed software solution that is a practical
implementation of the proposed pattern. We give an example of its real-life use
in industrial production of electric components.


title:
Using the Random Sprays Retinex Algorithm for Global Illumination
  Estimation

abstract:
  In this paper the use of Random Sprays Retinex (RSR) algorithm for global
illumination estimation is proposed and its feasibility tested. Like other
algorithms based on the Retinex model, RSR also provides local illumination
estimation and brightness adjustment for each pixel and it is faster than other
path-wise Retinex algorithms. As the assumption of the uniform illumination
holds in many cases, it should be possible to use the mean of local
illumination estimations of RSR as a global illumination estimation for images
with (assumed) uniform illumination allowing also the accuracy to be easily
measured. Therefore we propose a method for estimating global illumination
estimation based on local RSR results. To our best knowledge this is the first
time that RSR algorithm is used to obtain global illumination estimation. For
our tests we use a publicly available color constancy image database for
testing. The results are presented and discussed and it turns out that the
proposed method outperforms many existing unsupervised color constancy
algorithms. The source code is available at
http://www.fer.unizg.hr/ipg/resources/color_constancy/.