title: Spin-Orbital Driven Ferroelectricity

abstract:
  Proposing a general formulism in terms of local coordinates representing the
tilting of the ligands' octahedra, we evaluate the electric polarization in a
chain of transition metal ions with unpolar octahedron rotation. We find the
orbital ordering produced by the ligands's rotation and the spin order,
together, determine the polarization features, manifesting that nonvannishing
polarization appears in collinear spin order and the direction of polarization
is no more restricted in the plane of spin rotation in cycloidal ordering.


title: KONUS Beam Dynamics Design of Uranium DTL for HIAF

abstract:
  KONUS beam dynamics design of uranium DTL with LORASR code is presented. The
238U34+ beam, whose current is 5.0emA, is accelerated from injection energy of
0.35MeV/u to output energy of 1.3MeV/u by IH-DTL operated at 81.25MHz in HIAF
project at IMP of CAS. It achieves transmission efficiency of 94.95% with the
cavity length 267.8cm. Optimization aims are the reduction of emittance growth,
of beam loss and of project costs. Because of the requirements of CW mode
operation,the designed average acceleration gradient is about 2.48MV/m. Maximum
axial filed is 10.2MV/m, meanwhile Kilpatrick breakdown field is 10.56MV/m at
81.25MHz.


title:
Magnetic Nonpotentiality in Photospheric Active Regions as a Predictor
  of Solar Flares

abstract:
  Based on several magnetic nonpotentiality parameters obtained from the vector
photospheric active region magnetograms obtained with the Solar Magnetic Field
Telescope at the Huairou Solar Observing Station over two solar cycles, a
machine learning model has been constructed to predict the occurrence of flares
in the corresponding active region within a certain time window. The Support
Vector Classifier, a widely used general classifier, is applied to build and
test the prediction models. Several classical verification measures are adopted
to assess the quality of the predictions. We investigate different flare levels
within various time windows, and thus it is possible to estimate the rough
classes and erupting times of flares for particular active regions. Several
combinations of predictors have been tested in the experiments. The True Skill
Statistics are higher than 0.36 in 97% of cases and the Heidke Skill Scores
range from 0.23 to 0.48. The predictors derived from longitudinal magnetic
fields do perform well, however they are less sensitive in predicting large
flares. Employing the nonpotentiality predictors from vector fields improves
the performance of predicting large flares of magnitude $\geq$M5.0 and
$\geq$X1.0.


title:
Transport in Suspended Monolayer and Bilayer Graphene Under Strain: A
  New Platform for Material Studies

abstract:
  We develop two types of graphene devices based on nanoelectromechanical
systems (NEMS), that allows transport measurement in the presence of in situ
strain modulation. Different mobility and conductance responses to strain were
observed for single layer and bilayer samples. These types of devices can be
extended to other 2D membranes such as MoS2, providing transport, optical or
other measurements with in situ strain.


title:
The minimal dimensions of faithful representations for Heisenberg Lie
  superalgebras

abstract:
  This paper aims to characterize the minimal dimensions and super-dimensions
of faithful representations for the Heisenberg Lie superalgebras over an
algebraically closed field of characteristic zero.


title: Seismology of the Wounded Sun

abstract:
  Active regions are open wounds in the Sun's surface. Seismic oscillations
from the interior pass through them into the atmosphere, changing their nature
in the process to fast and slow magneto-acoustic waves. The fast waves then
partially reflect and partially mode convert to upgoing and downgoing Alfv\'en
waves. The reflected fast and downgoing Alfv\'en waves then re-enter the
interior through the active regions that spawned them, infecting the surface
seismology with signatures of the atmosphere. Using numerical simulations of
waves in uniform magnetic fields, we calculate the upward acoustic and
Alfv\'enic losses in the atmosphere as functions of field inclination and wave
orientation as well as the Time-Distance `travel time' perturbations, and show
that they are related. Travel time perturbations relative to quiet Sun can
exceed 40 seconds in 1 kG magnetic field. It is concluded that active region
seismology is indeed significantly infected by waves leaving and re-entering
the interior through magnetic wounds, with differing travel times depending on
the orientation of the wave vector relative to the magnetic field. This
presages a new directional-time-distance seismology.


title: The asymptotic enhanced negative type of finite ultrametric spaces

abstract:
  Negative type inequalities arise in the study of embedding properties of
metric spaces, but they often reduce to intractable combinatorial problems. In
this paper we study more quantitative versions of these inequalities involving
the so-called $p$-negative type gap. In particular, we focus our attention on
the class of finite ultrametric spaces which are important in areas such as
phylogenetics and data mining.
  Let $(X,d)$ be a given finite ultrametric space with minimum non-zero
distance $\alpha$. Then the $p$-negative type gap $\Gamma_{X}(p)$ of $(X,d)$ is
positive for all $p \geq 0$. In this paper we compute the value of the limit
\begin{eqnarray*} \Gamma_{X}(\infty) & = & \lim\limits_{p \rightarrow \infty}
\frac{\Gamma_{X}(p)}{\alpha^{p}}. \end{eqnarray*} It turns out that this value
is positive and it may be given explicitly by an elegant combinatorial formula.
On the basis of our calculations we are then able to characterize when
$\Gamma_{X}(p)/ \alpha^{p}$ is constant on $[0, \infty)$.
  The determination of $\Gamma_{X}(\infty)$ also leads to new, asymptotically
sharp, families of enhanced $p$-negative type inequalities for $(X,d)$. Indeed,
suppose that $G \in (0, \Gamma_{X}(\infty))$. Then, for all sufficiently large
$p$, we have \begin{eqnarray*} \frac{G \cdot \alpha^{p}}{2} \left(
\sum\limits_{k=1}^{n} |\zeta_{k}| \right)^{2} + \sum\limits_{j,i =1}^{n}
d(z_{j},z_{i})^{p} \zeta_{j} \zeta_{i} & \leq & 0 \end{eqnarray*} for each
finite subset $\{ z_{1}, \ldots, z_{n} \} \subseteq X$ and each choice of real
numbers $\zeta_{1}, \ldots, \zeta_{n}$ with $\zeta_{1} + \cdots + \zeta_{n} =
0$. We note that these results do not extend to general finite metric spaces.


title:
Generalized Linear Cellular Automata in Groups and Difference Galois
  Theory

abstract:
  Generalized non-autonomous linear celullar automata are systems of linear
difference equations with many variables that can be seen as convolution
equations in a discrete group. We study those systems from the stand point of
the Galois theory of difference equations and discrete Fourier transform.


title: Spatial-Aware Dictionary Learning for Hyperspectral Image Classification

abstract:
  This paper presents a structured dictionary-based model for hyperspectral
data that incorporates both spectral and contextual characteristics of a
spectral sample, with the goal of hyperspectral image classification. The idea
is to partition the pixels of a hyperspectral image into a number of spatial
neighborhoods called contextual groups and to model each pixel with a linear
combination of a few dictionary elements learned from the data. Since pixels
inside a contextual group are often made up of the same materials, their linear
combinations are constrained to use common elements from the dictionary. To
this end, dictionary learning is carried out with a joint sparse regularizer to
induce a common sparsity pattern in the sparse coefficients of each contextual
group. The sparse coefficients are then used for classification using a linear
SVM. Experimental results on a number of real hyperspectral images confirm the
effectiveness of the proposed representation for hyperspectral image
classification. Moreover, experiments with simulated multispectral data show
that the proposed model is capable of finding representations that may
effectively be used for classification of multispectral-resolution samples.


title:
Comment On "A modified Lennard-Jones-type equation of state for solids
  strictly satisfying the spinodal condition"

abstract:
  The cohesive energies of solids calculated using mGLJ EOS proposed by Sun
Jiuxun (Sun Jiuxun, J. Phys.: Condens. Matter 17, L103 (2005)) are seen to be
erroneous. Also we observed that the thermodynamic properties calculated using
the mGLJ potential diverge for materials whose pressure derivative of bulk
modulus at equilibrium is less than 5. Thus the mGLJ potential cannot be used
in liquid state theories and molecular simulations to obtain thermodynamic
properties.


title: A toy model for the pseudogap state of cuprates

abstract:
  A toy model is developed to capture "dance of pre-formed pairs" in the
pseudogap state of high temperature cuprate superconductors. The model is a
crude description of a hypothetical situation in which spin-driven spatial
organization of the pre-formed pairs is analyzed. Within a mean-field theory (a
slight generalization of Bragg-Williams theory) we examined the behaviour of
heat capacity and an "order parameter" which captures the short range
correlations between the pre-formed pairs. Below a transition temperature these
short range correlations enhance and leads to a long range order (spin-density
wave). This is examined through the breakdown of statistical independence.


title: Noncoercive Ricci flow invariant curvature cones

abstract:
  This note is a study of nonnegativity conditions on curvature which are
preserved by the Ricci flow. We focus on specific kinds of curvature conditions
which we call noncoercive, these are the conditions for which nonnegative
curvature and vanishing scalar curvature doesn't imply flatness. We show that,
in dimensions greater than 4, if a Ricci flow invariant condition is weaker
than "Einstein with nonnegative scalar curvature", then this condition has to
be "nonnegative scalar curvature". As a corollary, we obtain that a Ricci flow
invariant curvature condition which is stronger than "nonnegative scalar
curvature" cannot be (strictly) satisfied by compact Einstein symmetric spaces
such as S^2xS^2 or CP^2. We also investigate conditions which are satisfied by
all conformally flat manifolds with nonnegative scalar curvature.


title:
Critical exponent of metal-insulator transition in doped semiconductors:
  the relevance of the Coulomb interaction

abstract:
  We report a simulation of the metal-insulator transition in a model of a
doped semiconductor that treats disorder and interactions on an equal footing.
The model is analyzed using density functional theory. From a multi-fractal
analysis of the Kohn-Sham eigenfunctions, we find $\nu \approx 1.3$ for the
critical exponent of the correlation length. This differs from that of
Anderson's model of localization and suggests that the Coulomb interaction
changes the universality class of the transition.


title:
Anomalous crossed Andreev reflection in mesoscopic superconducting ring
  hosting Majorana fermions

abstract:
  We investigate the Majorana physics and its effect on the electron transport
in the non-topological superconductor(NS)-topological superconductor(TS) double
junctions of a ring geometry. We find that, depending on the ratio between the
lengths of two topologically different regions and the localization lengths of
the Majorana fermions formed between them, two completely different transport
mechanisms are working: perfect crossed Andreev reflection (CAR) for the short
NS region and perfect normal Andreev reflection for the short TS region. The
difference is explained in terms of the topologically distinct properties of
subgap states in the NS-TS double junction system, which have not been revealed
so far. The exotic dependence of the CAR process on the magnetic flux threading
the ring is uncovered and can be used to detect the Majorana fermions.


title: How is entropy production rate related to chemical reaction rate?

abstract:
  The entropy production rate is a key quantity in irreversible thermodynamics.
In this work, we concentrate on the realization of entropy production rate in
chemical reaction systems in terms of the experimentally measurable reaction
rate. Both triangular and linear networks have been studied. They attain either
thermodynamic equilibrium or a non-equilibrium steady state, under suitable
external constraints. We have shown that the entropy production rate is
proportional to the square of the reaction velocity only around equilibrium and
not any arbitrary non-equilibrium steady state. This feature can act as a guide
in revealing the nature of a steady state, very much like the minimum entropy
production principle. A discussion on this point has also been presented.


title:
Oblique breathers generated by a flow of two-component Bose-Einstein
  condensate past a polarized obstacle

abstract:
  We predict that oblique breathers can be generated by a flow of two-component
Bose-Einstein condensate past a polarized obstacle which attracts one component
of the condensate and repels the other one. The breather exists if
intra-species interaction constants differ from the inter-species interaction
constant and it corresponds to the nonlinear excitation of the so-called
polarization mode with domination of the relative motion of the components.
Approximate analytical theory is developed for the case of small-amplitude
breathers that is in reasonable agreement with the exact numerical results.


title:
Multichannel Deconvolution with Long Range Dependence: Upper bounds on
  the $L^p$-risk $(1 \le p < \infty)$

abstract:
  We consider multichannel deconvolution in a periodic setting with long-memory
errors under three different scenarios for the convolution operators, i.e.,
super-smooth, regular-smooth and box-car convolutions. We investigate global
performances of linear and hard-thresholded non-linear wavelet estimators for
functions over a wide range of Besov spaces and for a variety of loss functions
defining the risk. In particular, we obtain upper bounds on convergence rates
using the $L^p$-risk $(1 \le p < \infty)$. Contrary to the case where the
errors follow independent Brownian motions, it is demonstrated that
multichannel deconvolution with errors that follow independent fractional
Brownian motions with different Hurst parameters results in a much more
involved situation. An extensive finite-sample numerical study is performed to
supplement the theoretical findings.


title: The Group Lasso for Design of Experiments

abstract:
  We introduce an application of the group lasso to design of experiments. Note
that we are NOT trying to explain experimental design for the group lasso.
Conversely, we explain how we can use the idea of the group lasso in
experimental design, showing that the problem of constructing an optimal design
matrix can be transformed into a problem of the group lasso. In some numerical
examples, we show that we can obtain the orthogonal arrays as the solutions of
the group lasso problems.


title:
Simulation of energy scan of pion interferometry in central Au + Au
  collisions at relativistic energies

abstract:
  We present a systematic analysis of two-pion interferometry for the central
Au+Au collisions at $\sqrt{S_{NN}}$ = 3, 5, 7, 11, 17, 27, 39, 62, 130 and 200
GeV/c with the help of a multiphase transport (AMPT) model. Emission
source-size radius parameters $R_{long}$, $R_{out}$, $R_{side}$ and the chaotic
parameter $\lambda$ are extracted and compared with the experimental data.
Transverse momentum and azimuthal angle dependencies of the HBT radii are also
discussed for central Au+Au collisions at 200 GeV/c. The results show that the
HBT radii in central collisions do not change much above 7 GeV/c. For central
collisions at 200GeV/c, the radii decrease with the increasing of transverse
momentum $p_{T}$ but not sensitive to the azimuthal angle. These results
provide a theoretical reference for the energy scan program of the RHIC-STAR
experiment.


title:
Chirality from interfacial spin-orbit coupling effects in magnetic
  bilayers

abstract:
  As nanomagnetic devices scale to smaller sizes, spin-orbit coupling due to
the broken structural inversion symmetry at interfaces becomes increasingly
important. Here we study interfacial spin-orbit coupling effects in magnetic
bilayers using a simple Rashba model. The spin-orbit coupling introduces
chirality into the behavior of the electrons and through them into the
energetics of the magnetization. In the derived form of the magnetization
dynamics, all of the contributions that are linear in the spin-orbit coupling
follow from this chirality, considerably simplifying the analysis. For these
systems, an important consequence is a correlation between the
Dzyaloshinskii-Moriya interaction and the spin-orbit torque. We use this
correlation to analyze recent experiments.


title: Intensional view of General Single Processor Operating Systems

abstract:
  Operating systems are currently viewed ostensively. As a result they mean
different things to different people. The ostensive character makes it is hard
to understand OSes formally. An intensional view can enable better formal work,
and also offer constructive support for some important problems, e.g. OS
architecture. This work argues for an intensional view of operating systems. It
proposes to overcome the current ostensive view by defining an OS based on
formal models of computation, and also introduces some principles. Together
these are used to develop a framework of algorithms of single processor OS
structure using an approach similar to function level programming. In this
abridged paper we illustrate the essential approach, discuss some advantages
and limitations and point out some future possibilities.


title:
Isoscalar giant monopole resonance in Sn isotopes using a quantum
  molecular dynamics model

abstract:
  The isoscalar giant monopole resonance (ISGMR) in Sn isotopes and other
nuclei is investigated in the framework of the isospin-dependent quantum
molecular dynamics (IQMD) model. The spectrum of GMR is calculated by taking
the root-mean-square (RMS) radius of a nucleus as its monopole moment. The peak
energy, the full width at half maximum (FWHM), and the strength of GMR
extracted by a Gaussian fit to the spectrum have been studied. The GMR peak
energies for Sn isotopes from the calculations using a mass-number dependent
Gaussian wave-packet width $\sigma_r$ for nucleons are found to be
overestimated and show a weak dependence on the mass number compared with the
experimental data. However, it is found that experimental data of the GMR peak
energies for $^{56}$Ni, $^{90}$Zr, and $^{208}$Pb as well as Sn isotopes can be
nicely reproduced after taking into account the isospin dependence in isotope
chains in addition to the mass number dependence of $\sigma_r$ for nucleons in
the IQMD model calculation.


title: Controllability Metrics, Limitations and Algorithms for Complex Networks

abstract:
  This paper studies the problem of controlling complex networks, that is, the
joint problem of selecting a set of control nodes and of designing a control
input to steer a network to a target state. For this problem (i) we propose a
metric to quantify the difficulty of the control problem as a function of the
required control energy, (ii) we derive bounds based on the system dynamics
(network topology and weights) to characterize the tradeoff between the control
energy and the number of control nodes, and (iii) we propose an open-loop
control strategy with performance guarantees. In our strategy we select control
nodes by relying on network partitioning, and we design the control input by
leveraging optimal and distributed control techniques. Our findings show
several control limitations and properties. For instance, for Schur stable and
symmetric networks: (i) if the number of control nodes is constant, then the
control energy increases exponentially with the number of network nodes, (ii)
if the number of control nodes is a fixed fraction of the network nodes, then
certain networks can be controlled with constant energy independently of the
network dimension, and (iii) clustered networks may be easier to control
because, for sufficiently many control nodes, the control energy depends only
on the controllability properties of the clusters and on their coupling
strength. We validate our results with examples from power networks, social
networks, and epidemics spreading.


title: Colour octet potential to three loops

abstract:
  We consider the interaction between two static sources in the colour octet
configuration and compute the potential to three loops. Special emphasis is put
on the treatment of pinch contributions and two methods are applied to reduce
their evaluation to diagrams without pinches.


title: Dark Matter from Conformal Sectors

abstract:
  We show that a conformal-invariant dark sector, interacting conformally with
the Standard Model (SM) fields through the Higgs portal, provides a viable
framework where cold dark matter (CDM) and invisible Higgs decays can be
addressed concurrently. Conformal symmetry naturally subsumes the Z_2 symmetry
needed for stability of the CDM. It also guarantees that the weaker the
couplings of the dark sector fields to the SM Higgs field, the smaller the
masses they acquire through elektroweak breaking. The model comfortably
satisfies the bounds from Large Hadron Collider (LHC) and Planck Space
Telescope (Planck 2013).


title: Complexity and Unwinding for Intransitive Noninterference

abstract:
  The paper considers several definitions of information flow security for
intransitive policies from the point of view of the complexity of verifying
whether a finite-state system is secure. The results are as follows. Checking
(i) P-security (Goguen and Meseguer), (ii) IP-security (Haigh and Young), and
(iii) TA-security (van der Meyden) are all in PTIME, while checking TO-security
(van der Meyden) is undecidable, as is checking ITO-security (van der Meyden).
The most important ingredients in the proofs of the PTIME upper bounds are new
characterizations of the respective security notions, which also lead to new
unwinding proof techniques that are shown to be sound and complete for these
notions of security, and enable the algorithms to return simple
counter-examples demonstrating insecurity. Our results for IP-security improve
a previous doubly exponential bound of Hadj-Alouane et al.


title: Thermodynamic potential for compactified bosonic strings

abstract:
  We discuss the inclusion of chemical potentials of the Kaluza-Klein charges
in the partition function of the bosonic string with a compactified dimension
on a circle. The construction of the thermodynamic potential is achieved by the
path integral method at one-loop level. Duality symmetry in the dependence on
compactification scale is examined. A modular-invariant expression for the
thermodynamic potential is also presented.


title:
Generation of Secret Key for Physical Layer to Evaluate Channel
  Characteristics in Wireless Communications

abstract:
  This manuscript aims to generate a secret key for a PHY layer to evaluate the
channel characteristics in wireless communications. An algorithmic approach is
adopted for multimedia encryption to generate a secret key between two entities
communicating with each other in a real time simulation environment such as
MATLAB. Two classes of PHY key generation schemes are analyzed for designing
the algorithm such as received-signal-strength-based and channel- phase-based
protocols. We present a performance comparison of them in terms of key
disagreement probability, key generation rate, key bit randomness, scalability,
and implementation issues.


title: Electron-Hole Entanglement in a Quantum Spin Hall Insulator

abstract:
  We demonstrate that entangled electron-hole pairs can be produced and
detected in a quantum spin Hall insulator with a constriction that allows for a
weak inter-edge tunneling. A violation of a Bell inequality, which can be
constructed in terms of low-frequency nonlocal current-current correlations,
serves as a detection of the entanglement. We show that the maximum violation
of a Bell inequality can be naturally achieved in this setup, without a need to
fine tune tunneling parameters. This may provide a viable route to producing
spin entanglement in the absence of any correlations and pairing, where
spin-to-charge conversion is enabled by the helical edge structure of a quantum
spin Hall insulator.


title: Noether symmetries in extended gravity quantum cosmology

abstract:
  We summarize the use of Noether symmetries in Minisuperspace Quantum
Cosmology. In particular, we consider minisuperspace models, showing that the
existence of conserved quantities gives selection rules that allow to recover
classical behaviors in cosmic evolution according to the so called Hartle
criterion. Such a criterion selects correlated regions in the configuration
space of dynamical variables whose meaning is related to the emergence of
classical observable universes. Some minisuperspace models are worked out
starting from Extended Gravity, in particular coming from scalar tensor, f(R)
and f(T) theories. Exact cosmological solutions are derived.


title:
Scaling theory vs exact numerical results for spinless resonant level
  model

abstract:
  The continuous-time quantum Monte Carlo method is applied to the interacting
resonant level model (IRLM) using double expansion with respect to Coulomb
interaction Ufc and hybridization V. Thermodynamics of the IRLM without spin is
equivalent to the anisotropic Kondo model in the low-energy limit. Exact
dynamics and thermodynamics of the IRLM are derived numerically for a wide
range of Ufc with a given value of V. For negative Ufc, excellent agreement
including a quantum critical point is found with a simple scaling formula that
deals with V in the lowest-order, and Ufc up to infinite order. As Ufc becomes
positive and large, lower order scaling results deviate from exact numerical
results. Possible relevance of the results is discussed to certain Samarium
compounds with unusual heavy-fermion behavior.


title:
Cavity-based robustness analysis of interdependent networks: Influences
  of intranetwork and internetwork degree-degree correlations

abstract:
  We develop a methodology for analyzing the percolation phenomena of two
mutually coupled (interdependent) networks based on the cavity method of
statistical mechanics. In particular, we take into account the influence of
degree-degree correlations inside and between the networks on the network
robustness against targeted attacks and random failures. We show that the
developed methodology is reduced to the well-known generating function
formalism in the absence of degree-degree correlations. The validity of the
developed methodology is confirmed by a comparison with the results of
numerical experiments. Our analytical results imply that the robustness of the
interdependent networks depends considerably on both the intra- and
internetwork degree-degree correlations in the case of targeted attacks,
whereas the significance of the degree-degree correlations is relatively low
for random failures.


title:
Identification of Finite Dimensional Linear Systems Driven by Levy
  processes

abstract:
  Levy processes are widely used in financial mathematics, telecommunication,
economics, queueing theory and natural sciences for modelling. A typical model
is obtained by considering finite dimensional linear stochastic SISO systems
driven by a Levy process. In this paper we consider a discrete-time version of
this model driven by the increments of a Levy process, such a system will be
called Levy system. We focus on the problem of identifying the dynamics and the
noise characteristics of such a Levy system. The special feature of this
problem is that the statistical description of the noise is given by the
characteristic function (c.f.) of the driving noise not by its density
function. As an alternative to the maximum likelihood (ML) method we develop
and analyze a novel identification method by adapting the so-called empirical
characteristic function method (ECF) originally devised for estimating
parameters of c.f.-s from i.i.d. samples. Precise characterization of the
errors of these estimators will be given, and their asymptotic covariance
matrices will be obtained. We also demonstrate that the arguments implying
asymptotic efficiency for the i.i.d. case can be adapted for the present case.


title: Online Algorithms for Basestation Allocation

abstract:
  Design of {\it online algorithms} for assigning mobile users to basestations
is considered with the objective of maximizing the sum-rate, when all users
associated to any one basestation equally share each basestation's resources.
Each user on its arrival reveals the rates it can obtain if connected to each
of the basestations, and the problem is to assign each user to any one
basestation irrevocably so that the sum-rate is maximized at the end of all
user arrivals, without knowing the future user arrival or rate information or
its statistics at each user arrival. Online algorithms with constant factor
loss in comparison to offline algorithms (that know both the user arrival and
user rates profile in advance) are derived. The proposed online algorithms are
motivated from the famous online k-secretary problem and online maximum weight
matching problem.


title: Finite-time thermodynamics of port-Hamiltonian systems

abstract:
  In this paper, we identify a class of time-varying port-Hamiltonian systems
that is suitable for studying problems at the intersection of statistical
mechanics and control of physical systems. Those port-Hamiltonian systems are
able to modify their internal structure as well as their interconnection with
the environment over time. The framework allows us to prove the First and
Second laws of thermodynamics, but also lets us apply results from optimal and
stochastic control theory to physical systems. In particular, we show how to
use linear control theory to optimally extract work from a single heat source
over a finite time interval in the manner of Maxwell's demon. Furthermore, the
optimal controller is a time-varying port-Hamiltonian system, which can be
physically implemented as a variable linear capacitor and transformer. We also
use the theory to design a heat engine operating between two heat sources in
finite-time Carnot-like cycles of maximum power, and we compare those two heat
engines.


title: Opportunistic Spectrum Sensing and Transmissions

abstract:
  Nowadays, cognitive radio is one of the most promising paradigms in the arena
of wireless communications, as it aims at the proficient use of radio
resources. Proper utilization of the radio spectrum requires dynamic spectrum
accessing. To this end, spectrum sensing is undoubtedly necessary. In this
chapter, various approaches for dynamic spectrum access scheme are presented,
together with a survey of spectrum sensing methodologies for cognitive radio.
Moreover, the challenges are analyzed that are associated with spectrum sensing
and dynamic spectrum access techniques. Sensing beacon transmitted from
different cognitive terminals creates significant interference to the primary
users if proper precautions have not be not taken into consideration.
Consequently, cognitive radio transmitter power control will be finally
addressed to analyze energy efficiency aspects.


title: Vandermonde Nets

abstract:
  The second author recently suggested to identify the generating matrices of a
digital $(t,m,s)$-net over the finite field $F_q$ with an $s \times m$ matrix
$C$ over $F_{q^m}$. More exactly, the entries of $C$ are determined by
interpreting the rows of the generating matrices as elements of $F_{q^m}$. This
paper introduces so-called Vandermonde nets, which correspond to
Vandermonde-type matrices $C$, and discusses the quality parameter and the
discrepancy of such nets. The methods that have been successfully used for the
investigation of polynomial lattice point sets and hyperplane nets are applied
to this new class of digital nets. In this way, existence results for small
quality parameters and good discrepancy bounds are obtained. Furthermore, a
first step towards component-by-component constructions is made. A novelty of
this new class of nets is that explicit constructions of Vandermonde nets over
$F_q$ in dimensions $s \le q+1$ with best possible quality parameter can be
given. So far, good explicit constructions of the competing polynomial lattice
point sets are known only in dimensions $s \le 2$.


title: Mixed-field orientation of molecules without rotational symmetry

abstract:
  The mixed-field orientation of an asymmetric-rotor molecule with its
permanent dipole moment non-parallel to the principal axes of polarizability is
investigated experimentally and theoretically. We find that for the typical
case of a strong, nonresonant laser field and a weak static electric field
complete 3D orientation is induced if the laser field is elliptically polarized
and if its major and minor polarization axes are not parallel to the static
field. For a linearly polarized laser field solely the dipole moment component
along the most polarizable axis of the molecule is relevant resulting in 1D
orientation even when the laser polarization and the static field are non
parallel. Simulations show that the dipole moment component perpendicular to
the most-polarizable axis becomes relevant in a strong dc electric field
combined with the laser field. This offers an alternative approach to 3D
orientation by combining a linearly-polarized laser field and a strong dc
electric field arranged at an angle equal to the angle between the most
polarizable axis of the molecule and its permanent dipole moment.


title:
Solving highly-oscillatory NLS with SAM: numerical efficiency and
  geometric properties

abstract:
  In this paper, we present the Stroboscopic Averaging Method (SAM), recently
introduced in [7,8,10,12], which aims at numerically solving highly-oscillatory
differential equations. More specifically, we first apply SAM to the
Schr\"odinger equation on the 1-dimensional torus and on the real line with
harmonic potential, with the aim of assessing its efficiency: as compared to
the well-established standard splitting schemes, the stiffer the problem is,
the larger the speed-up grows (up to a factor 100 in our tests). The geometric
properties of SAM are also explored: on very long time intervals, symmetric
implementations of the method show a very good preservation of the mass
invariant and of the energy. In a second series of experiments on 2-dimensional
equations, we demonstrate the ability of SAM to capture qualitatively the
long-time evolution of the solution (without spurring high oscillations).


title: AGN behind the SMC selected from radio and X-ray surveys

abstract:
  The XMM-Newton survey of the Small Magellanic Cloud (SMC) revealed 3053 X-ray
sources with the majority expected to be active galactic nuclei (AGN) behind
the SMC. However, the high stellar density in this field often does not allow
assigning unique optical counterparts and hinders source classification. On the
other hand, the association of X-ray point sources with radio emission can be
used to select background AGN with high confidence, and to constrain other
object classes like pulsar wind nebula. To classify X-ray and radio sources, we
use clear correlations of X-ray sources found in the XMM-Newton survey with
radio-continuum sources detected with ATCA and MOST. Deep radio-continuum
images were searched for correlations with X-ray sources of the XMM-Newton
SMC-survey point-source catalogue as well as galaxy clusters seen with extended
X-ray emission. Eighty eight discrete radio sources were found in common with
the X-ray point-source catalogue in addition to six correlations with extended
X-ray sources. One source is identified as a Galactic star and eight as
galaxies. Eight radio sources likely originate in AGN that are associated with
clusters of galaxies seen in X-rays. One source is a PWN candidate. We obtain
43 new candidates for background sources located behind the SMC. A total of 24
X-ray sources show jet-like radio structures.


title: Analysis of models for quantum transport of electrons in graphene layers

abstract:
  We present and analyze two mathematical models for the self consistent
quantum transport of electrons in a graphene layer. We treat two situations.
First, when the particles can move in all the plane $\RR^2$, the model takes
the form of a system of massless Dirac equations coupled together by a
selfconsistent potential, which is the trace in the plane of the graphene of
the 3D Poisson potential associated to surface densities. In this case, we
prove local in time existence and uniqueness of a solution in $H^s(\RR^2)$, for
$s > 3/8$ which includes in particular the energy space $H^{1/2}(\RR^2)$. The
main tools that enable to reach $s\in (3/8,1/2)$ are the dispersive Strichartz
estimates that we generalized here for mixed quantum states. Second, we
consider a situation where the particles are constrained in a regular bounded
domain $\Omega$. In order to take into account Dirichlet boundary conditions
which are not compatible with the Dirac Hamiltonian $H_{0}$, we propose a
different model built on a modified Hamiltonian displaying the same energy band
diagram as $H_{0}$ near the Dirac points. The well-posedness of the system in
this case is proved in $H^s_{A}$, the domain of the fractional order Dirichlet
Laplacian operator, for $1/2\leq s<5/2$.


title:
Correct nonlinearity and hysteresis of volt-ampere characteristics of
  spin valves, magnetic tunnel junctions and memristors

abstract:
  There are essential achievements in synthesis of interesting for creation of
compact electronic memory switched by own current structures of spin valves and
magnetic tunnel junctions with hysteretic current dependences of resistance. In
the offered message the attention to discrepancy to physical principles of a
hysteresis of resistance represented in publications is paid. It is
schematically presented how the dependences of resistance on current should
look not contradicting the energy conservation law for hysteresis dependence of
resistance on current and corresponding volt-ampere characteristic.


title:
Asymmetric connectedness of stocks: How does bad and good volatility
  spill over the U.S. stock market?

abstract:
  Asymmetries in volatility spillovers are highly relevant to risk valuation
and portfolio diversification strategies in financial markets. Yet, the large
literature studying information transmission mechanisms ignores the fact that
bad and good volatility may spill over at different magnitudes. This paper
fills this gap with two contributions. One, we suggest how to quantify
asymmetries in volatility spillovers due to bad and good volatility. Two, using
high frequency data covering most liquid U.S. stocks in seven sectors, we
provide ample evidence of the asymmetric connectedness of stocks. We
universally reject the hypothesis of symmetric connectedness at the
disaggregate level but in contrast, we document the symmetric transmission of
information in an aggregated portfolio. We show that bad and good volatility is
transmitted at different magnitudes in different sectors, and the asymmetries
sizably change over time. While negative spillovers are often of substantial
magnitudes, they do not strictly dominate positive spillovers. We find that the
overall intra-market connectedness of U.S. stocks increased substantially with
the increased uncertainty of stock market participants during the financial
crisis.


title:
Stability, Tunneling and Flux Changing de Sitter Transitions in the
  Large Volume String Scenario

abstract:
  We study the non-perturbative stability of the Large Volume Scenario (LVS) of
IIB string compactifications, by analysing transitions mediated by the
Brown-Teitelboim (BT) brane nucleations and by Coleman De Luccia tunneling
(CDL). We find that, as long as the effective field theory description holds,
the LVS AdS minima are stable despite being non-supersymmetric. This opens the
possibility of having a CFT dual. Metastable de Sitter vacua behave differently
depending on the uplifting mechanism. We find explicit expressions for the
different decay rates in terms of exponentials of the volume. Among the
transitions of dS to dS those with increasing volume and decreasing vacuum
energy are preferred, though dS decays to AdS (big-crunch sinks) have higher
probability. However, the probability of transitions via the CDL mechanism to
decompactification are exponentially much larger compared to these. The BT
decays correspond to flux/D3 brane transitions mediated by the nucleation of
D5/NS5 branes. We compare our results with previous analysis for KKLT, type
IIA, and 6D Einstein-Maxwell studies. In particular we find no indication for a
bubble of nothing decay.


title: Electronic structure and magnetic properties of Gd-doped and Eu-rich EuO

abstract:
  The effects of Gd doping and O vacancies on the magnetic interaction and
Curie temperature of EuO are studied using first-principles calculations.
Linear response calculations in the virtual crystal approximation show a broad
maximum in the Curie temperature as a function of doping, which results from
the combination of the saturating contribution from indirect exchange and a
decreasing contribution from the f-d hopping mechanism. Non-Heisenberg
interaction at low doping levels and its effect on the Curie temperature are
examined. The electronic structure of a substitutional Gd and of an O vacancy
in EuO are evaluated. When the 4f spins are disordered, the impurity state goes
from single to double occupation, but correlated bound magnetic polarons are
not ruled out. At higher vacancy concentrations typical for Eu-rich EuO films,
the impurity states broaden into bands and remain partially filled. To go
beyond the homogeneous doping picture, magnetostructural cluster expansions are
constructed, which describe the modified exchange parameters near Gd dopants or
O vacancies. Thermodynamic properties are studied using Monte Carlo
simulations. The Curie temperature for Gd-doped EuO agrees with the results of
the virtual crystal approximation and shows a maximum of about 150 K. At 3.125%
vacancy concentration the Curie temperature increases to 120 K, consistent with
experimental data for Eu-rich film samples.


title: Benchmarking Soundtrack Recommendation Systems with SRBench

abstract:
  In this work, a benchmark to evaluate the retrieval performance of soundtrack
recommendation systems is proposed. Such systems aim at finding songs that are
played as background music for a given set of images. The proposed benchmark is
based on preference judgments, where relevance is considered a continuous
ordinal variable and judgments are collected for pairs of songs with respect to
a query (i.e., set of images). To capture a wide variety of songs and images,
we use a large space of possible music genres, different emotions expressed
through music, and various query-image themes. The benchmark consists of two
types of relevance assessments: (i) judgments obtained from a user study, that
serve as a "gold standard" for (ii) relevance judgments gathered through
Amazon's Mechanical Turk. We report on an analysis of relevance judgments based
on different levels of user agreement and investigate the performance of two
state-of-the-art soundtrack recommendation systems using the proposed
benchmark.


title:
Electron rescattering at metal nanotips induced by ultrashort laser
  pulses

abstract:
  We theoretically investigate the interaction of moderate intensity
near-infrared few cycle laser pulses with nano-scale metal tips. Local field
enhancement in a nanometric region around the tip apex triggers coherent
electron emission on the nanometer length and femtosecond time scale. The
quantum dynamics at the surface are simulated with time-dependent density
functional theory (TDDFT) and interpreted based on the simple man's model. We
investigate the dependence of the emitted electron spectra on the laser
wavelength.


title: Optomechanical self-structuring in cold atomic gases

abstract:
  The rapidly developing field of optomechanics aims at the combined control of
optical and mechanical (solid-state or atomic) modes. In particular, laser
cooled atoms have been used to exploit optomechanical coupling for
self-organization in a variety of schemes where the accessible length scales
are constrained by a combination of pump modes and those associated to a second
imposed axis, typically a cavity axis. Here, we consider a system with many
spatial degrees of freedom around a single distinguished axis, in which two
symmetries - rotations and translations in the plane orthogonal to the pump
axis - are spontaneously broken. We observe the simultaneous spatial
structuring of the density of a cold atomic cloud and an optical pump beam. The
resulting patterns have hexagonal symmetry. The experiment demonstrates the
manipulation of matter by opto-mechanical self-assembly with adjustable length
scales and can be potentially extended to quantum degenerate gases.

categories: physics.atom-ph cond-mat.quant-gas nlin.PS physics.optics


title: The Peccei-Quinn Symmetry from a Gauged Discrete R Symmetry

abstract:
  The axion solution to the strong CP problem calls for an explanation as to
why the Lagrangian should be invariant under the global Peccei-Quinn symmetry,
U(1)_PQ, to such a high degree of accuracy. In this paper, we point out that
the U(1)_PQ can indeed survive as an accidental symmetry in the low-energy
effective theory, if the standard model gauge group is supplemented by a gauged
and discrete R symmetry, Z_N^R, forbidding all dangerous operators that
explicitly break the Peccei-Quinn symmetry. In contrast to similar approaches,
the requirement that the Z_N^R symmetry be anomaly-free forces us, in general,
to extend the supersymmetric standard model by new matter multiplets.
Surprisingly, we find a large landscape of viable scenarios that all
individually fulfill the current experimental constraints on the QCD vacuum
angle as well as on the axion decay constant. In particular, choosing the
number of additional multiplets appropriately, the order N of the Z_N^R
symmetry can take any integer value larger than 2. This has interesting
consequences with respect to possible solutions of the mu problem, collider
searches for vector-like quarks and axion dark matter.


title: Coalgebraic Characterizations of Context-Free Languages

abstract:
  In this article, we provide three coalgebraic characterizations of the class
of context-free languages, each based on the idea of adding coalgebraic
structure to an existing algebraic structure by specifying output-derivative
pairs. Final coalgebra semantics then gives an interpretation function into the
final coalgebra of all languages with the usual output and derivative
operations. The first characterization is based on systems, where each
derivative is given as a finite language over the set of nonterminals; the
second characterization on systems where derivatives are given as elements of a
term-algebra; and the third characterization is based on adding coalgebraic
structure to a class of closed (unique) fixed point expressions. We prove
equivalences between these characterizations, discuss the generalization from
languages to formal power series, as well as the relationship to the
generalized powerset construction.


title: Water and Ice Dielectric Spectra Scaling at 0 {\deg}C

abstract:
  Dielectric spectra (10^4-10^11 Hz) of water and ice at 0 {\deg}C are
considered in terms of proton conductivity and compared to each other. In this
picture, the Debye relaxations, centered at 1/{\tau}_W ~ 20 GHz (in water) and
1/{\tau}_I ~ 5 kHz (in ice), are seen as manifestations of diffusion of
separated charges in the form of H3O+ and OH- ions. The charge separation
results from the self-dissociation of H2O molecules, and is accompanied by
recombination in order to maintain the equilibrium concentration, N. The charge
recombination is a diffusion-controlled process with characteristic lifetimes
of {\tau}_W and {\tau}_I, for water and ice respectively. The static
permittivity, {\epsilon}(0), is solely determined by N. Both, N and
{\epsilon}(0), are roughly constant at the water-ice phase transition, and both
increase, due to a slowing down of the diffusion rate, as the temperature is
lowered. The transformation of the broadband dielectric spectra at 0 {\deg}C
with the drastic change from {\tau}_W to {\tau}_I is mainly due to an abrupt
(by 0.4 eV) change of the activation energy of the charge diffusion.


title:
On the nature of the hard X-ray sources SWIFTJ1907.3-2050,
  IGRJ12123-5802 and IGRJ19552+0044

abstract:
  The INTEGRAL and Swift hard X-ray surveys have identified a large number of
new sources, among which many are proposed as Cataclysmic Variables (CVs). Here
we present the first detailed study of three X-ray selected CVs, Swift
J1907.3-2050, IGRJ12123-5802, and IGRJ19552+0044 based on XMM-Newton, Suzaku,
Swift observations and ground based optical and archival nIR/IR data. Swift
J1907.3-2050 is highly variable from hours to months-years at all wavelengths.
No coherent X-ray pulses are detected but rather transient features. The X-ray
spectrum reveals a multi-temperature optically thin plasma absorbed by complex
neutral material and a soft black body component arising from a small area.
These characteristics are remarkably similar to those observed in magnetic CVs.
A supra-solar abundance of nitrogen could arise from nuclear processed material
from the donor star. Swift J1907.3-2050 could be a peculiar magnetic CV with
the second longest (20.82 h) binary period. IGRJ12123-5802 is variable in the
X-rays on a timescale of ~7.6 h. No coherent pulsations are detected, but its
spectral characteristics suggest that it could be a magnetic CV of the
Intermediate Polar (IP) type. IGRJ19552+0044 shows two X-ray periods, 1.38 h
and 1.69 h and a X-ray spectrum characterized by a multi-temperature plasma
with little absorption.We derive a low accretion rate, consistent with a CV
below the orbital period gap. Its peculiar nIR/IR spectrum suggests a
contribution from cyclotron emission. It could either be a pre-polar or an IP
with the lowest degree of asynchronism.


title: Charge-transfer from Regularized Symmetry-Adapted Perturbation Theory

abstract:
  The charge-transfer (CT) together with the polarization energy appears at
second and higher orders in symmetry-adapted perturbation theory (SAPT). At
present there is no theoretically compelling way of isolating the
charge-transfer energy that is simultaneously basis-set independent and
applicable for arbitrary intermolecular separation. We argue that the
charge-transfer can be interpreted as a tunneling phenomenon, and can therefore
be defined via regularized SAPT. This leads to a physically convincing,
basis-independent definition of the charge-transfer energy that captures
subtleties of the process, such as the asymmetry in the forward and backward
charge transfer, as well as secondary transfer effects. With this definition of
the charge-transfer the damping needed for polarization models can be
determined with a level of confidence hitherto not possible.


title: Broadband ferromagnetic resonance characterization of GaMnAs thin films

abstract:
  The precessional magnetization dynamics of GaMnAs thin films are
characterized by broadband network analyzer ferromagnetic resonance (FMR) in a
coplanar geometry at cryogenic temperatures. The FMR frequencies are
characterized as function of in-plane field angle and field amplitude. Using an
extended Kittel model of the FMR dispersion the magnetic film parameters such
as saturation magnetization and anisotropies are derived. The modification of
the FMR behavior and of the magnetic parameters of the thin film upon annealing
is analyzed.


title: Static Solutions of Einstein's Equations with Spherical Symmetry

abstract:
  The Schwarzschild solution is a complete solution of Einstein's field
equations for a static spherically symmetric field. The Einstein's field
equations solutions appear in the literature, but in different ways
corresponding to different definitions of the radial coordinate. We attempt to
compare them to the solutions with nonvanishing energy density and pressure. We
also calculate some special cases with changes in spherical symmetry.


title: An Electric Analogue to Gravity Induced Vacuum Dominance

abstract:
  It is shown that when a strong electric field is turned on as a background in
a charged scalar field, the vacuum state of the scalar field becomes
exponentially amplified. This is an analogue to gravity induced vacuum
amplification, where the vacuum state becomes exponentially amplified for some
geometries.


title: Lecture Notes on Turbulent Instability of Anti-de Sitter Spacetime

abstract:
  In these lecture notes we discuss recently conjectured instability of anti-de
Sitter space, resulting in gravitational collapse of a large class of
arbitrarily small initial perturbations. We uncover the technical details used
in the numerical study of spherically symmetric Einstein-massless scalar field
system with negative cosmological constant that led to the conjectured
instability.


title: Nucleon spin structure at very high-x

abstract:
  Dyson-Schwinger equation treatments of the strong interaction show that the
presence and importance of nonpointlike diquark correlations within the nucleon
are a natural consequence of dynamical chiral symmetry breaking. Using this
foundation, we deduce a collection of simple formulae, expressed in terms of
diquark appearance and mixing probabilities, from which one may compute ratios
of longitudinal-spin-dependent u- and d-quark parton distribution functions on
the domain x =1. A comparison with predictions from other approaches plus a
consideration of extant and planned experiments shows that the measurement of
nucleon longitudinal spin asymmetries on x =1 can add considerably to our
capacity for discriminating between contemporary pictures of nucleon structure.


title:
Page's Sequential Procedure for Change-Point Detection in Time Series
  Regression

abstract:
  In a variety of different settings cumulative sum (CUSUM) procedures have
been applied for the sequential detection of structural breaks in the
parameters of stochastic models. Yet their performance depends strongly on the
time of change and is best under early-change scenarios. For later changes
their finite sample behavior is rather questionable. We therefore propose
modified CUSUM procedures for the detection of abrupt changes in the regression
parameter of multiple time series regression models, that show a higher
stability with respect to the time of change than ordinary CUSUM procedures.
The asymptotic distributions of the test statistics and the consistency of the
procedures are provided. In a simulation study it is shown that the proposed
procedures behave well in finite samples. Finally the procedures are applied to
a set of capital asset pricing data related to the Fama-French extension of the
capital asset pricing model.


title: Velocity-Field Theory, Boltzmann's Transport Equation and Geometry

abstract:
  Boltzmann equation describes the time development of the velocity
distribution in the continuum fluid matter. We formulate the equation using the
field theory where the {\it velocity-field} plays the central role. The matter
(constituent particles) fields appear as the density and the viscosity. {\it
Fluctuation} is examined, and is clearly discriminated from the quantum effect.
The time variable is {\it emergently} introduced through the computational
process step. The collision term, for the (velocity)**4 potential (4-body
interaction), is explicitly obtained and the (statistical) fluctuation is
closely explained. The present field theory model does {\it not} conserve
energy and is an open-system model. (One dimensional) Navier-Stokes equation or
Burger's equation, appears. In the latter part, we present a way to directly
define the distribution function by use of the geometry, appearing in the
mechanical dynamics, and Feynman's path-integral.


title: Chemical mechanical polishing of thin film diamond

abstract:
  The demonstration that Nanocrystalline Diamond (NCD) can retain the superior
Young's modulus (1,100 GPa) of single crystal diamond twinned with its ability
to be grown at low temperatures (<450 {\deg}C) has driven a revival into the
growth and applications of NCD thin films. However, owing to the competitive
growth of crystals the resulting film has a roughness that evolves with film
thickness, preventing NCD films from reaching their full potential in devices
where a smooth film is required. To reduce this roughness, films have been
polished using Chemical Mechanical Polishing (CMP). A Logitech Tribo CMP tool
equipped with a polyurethane/polyester polishing cloth and an alkaline
colloidal silica polishing fluid has been used to polish NCD films. The
resulting films have been characterised with Atomic Force Microscopy, Scanning
Electron Microscopy and X-ray Photoelectron Spectroscopy. Root mean square
roughness values have been reduced from 18.3 nm to 1.7 nm over 25 {\mu}m$^2$,
with roughness values as low as 0.42 nm over ~ 0.25 {\mu}m$^2$. A polishing
mechanism of wet oxidation of the surface, attachment of silica particles and
subsequent shearing away of carbon has also been proposed.


title: Effects of Multi-Field Phantom Inflation in Big Rip

abstract:
  In this paper we study the behavior of the multi-field in phantom inflation,
when massive scalar fields work collectively, in which the scale factor is a
power law. We evaluate its parameter values by applying certain constraints on
our model parameters, and we investigate that before the Big Rip singularity
occurs the universe is in phantom inflationary phase. Furthermore, we calculate
these values for this period then compare with current observations of CMB, BAO
and observational Hubble data. We find that results may be consistent with
observations. This implies that in the dark-energy equation of state (EOS)
parameter $\omega_{DE}$ at the Big Rip remains finite, with the divergence of
pressure and dark energy density.


title: Asymptotic Distribution of the Delay Time in Page's Sequential Procedure

abstract:
  In this paper the asymptotic distribution of the stopping time in Page's
sequential cumulative sum (CUSUM) procedure is presented. Page as well as
ordinary cumulative sums are considered as detectors for changes in the mean of
observations satisfying a weak invariance principle. The main results on the
stopping times derived from these detectors extend a series of results on the
asymptotic normality of stopping times of CUSUM-type procedures. In particular
the results quantify the superiority of the Page CUSUM procedure to ordinary
CUSUM procedures in late change scenarios. The theoretical results are
illustrated by a small simulation study, including a comparison of the
performance of ordinary and Page CUSUM detectors.


title:
On the Veltman Condition, the Hierarchy Problem and High-Scale
  Supersymmetry

abstract:
  In this paper we have considered the possibility that the Standard Model, and
its minimal extension with the addition of singlets, merges with a high-scale
supersymmetric theory at a scale satisfying the Veltman condition and therefore
with no sensitivity to the cutoff. The matching of the Standard Model is
achieved at Planckian scales. In its complex singlet extension the matching
scale depends on the strength of the coupling between the singlet and Higgs
fields. For order one values of the coupling, still in the perturbative region,
the matching scale can be located in the TeV ballpark. Even in the absence of
quadratic divergences there remains a finite adjustment of the parameters in
the high-energy theory which should guarantee that the Higgs and the singlets
in the low-energy theory are kept light. This fine-tuning (unrelated to
quadratic divergences) is the entire responsibility of the ultraviolet theory
and remains as the missing ingredient to provide a full solution to the
hierarchy problem.


title: Geometric embeddings of braid groups do not merge conjugacy classes

abstract:
  An embedding of the m-times punctured disc into the n-times punctured disc,
for n>m, yields an embedding of the braid group on m strands B_m into the braid
group on n strands B_n, called a geometric embedding. The main example consists
of adding n-m trivial strands to the right of each braid on m strands. We show
that geometric embeddings do not merge conjugacy classes, meaning that if the
images of two elements in B_m by a geometric embedding are conjugate in B_n,
the original elements are conjugate in B_m. We also show that the result does
not hold, in general, for geometric embeddings of mapping class groups.


title:
PTF11agg as the First Evidence for Reverse Shock Emission from a
  Postmerger Millisecond Magnetar

abstract:
  Based on the stiff equations of state of neutron stars (NS) and the discovery
of high-mass NSs, a NS-NS merger will leave behind, with high probabilities, a
rapidly rotating massive magnetar. The central magnetar will dissipate its
rotational energy to the outflow by injecting Poynting flux, which will become
lepton-dominated so that a long-lasting reverse shock (RS) is developed. We
calculate the emission of the RS as well as the emission of forward shock (FS)
and find that in most cases the RS emission is stronger than FS emission. It is
found that the recently discovered transient, PTF11agg, can be neatly accounted
for by the RS emission powered by a millisecond magnetar. Other alternative
models have been considered and cannot explain the observed light curves well.
We therefore suggest that PTF11agg be the first evidence for RS emission from a
postmerger millisecond magnetar.


title: Thermodynamics of quantum coherence

abstract:
  Quantum decoherence is seen as an undesired source of irreversibility that
destroys quantum resources. Quantum coherences seem to be a property that
vanishes at thermodynamic equilibrium. Away from equilibrium, quantum
coherences challenge the classical notions of a thermodynamic bath in a Carnot
engines, affect the efficiency of quantum transport, lead to violations of
Fourier's law, and can be used to dynamically control the temperature of a
state. However, the role of quantum coherence in thermodynamics is not fully
understood. Here we show that the relative entropy of a state with quantum
coherence with respect to its decohered state captures its deviation from
thermodynamic equilibrium. As a result, changes in quantum coherence can lead
to a heat flow with no associated temperature, and affect the entropy
production rate. From this, we derive a quantum version of the Onsager
reciprocal relations that shows that there is a reciprocal relation between
thermodynamic forces from coherence and quantum transport. Quantum decoherence
can be useful and offers new possibilities of thermodynamic control for quantum
transport.


title:
Bounded-Choice Statements for User Interaction in Imperative and
  Object-Oriented Programming

abstract:
  Adding versatile interactions to imperative programming -- C, Java and
Android -- is an essential task. Unfortunately, existing languages provide only
limited constructs for user interaction. These constructs are usually in the
form of $unbounded$ quantification. For example, existing languages can take
the keyboard input from the user only via the $read(x)/scan(x)$ construct. Note
that the value of $x$ is unbounded in the sense that $x$ can have any value.
This construct is thus not useful for applications with bounded inputs. To
support bounded choices, we propose new bounded-choice statements for user
interation. Each input device (the keyboard, the mouse, the touch, $...$)
naturally requires a new bounded-choice statement. To make things simple,
however, we focus on a bounded-choice statement for keyboard -- kchoose -- to
allow for more controlled and more guided participation from the user. It is
straightforward to adjust our idea to other input devices. We illustrate our
idea via Java(BI), an extension of the core Java with a new bounded-choice
statement for the keyboard.


title: The Need for an R&D and Upgrade Program for CMS Software and Computing

abstract:
  Over the next ten years, the physics reach of the Large Hadron Collider (LHC)
at the European Organization for Nuclear Research (CERN) will be greatly
extended through increases in the instantaneous luminosity of the accelerator
and large increases in the amount of collected data. Due to changes in the way
Moore's Law computing performance gains have been realized in the past decade,
an aggressive program of R&D is needed to ensure that the computing capability
of CMS will be up to the task of collecting and analyzing this data.


title:
GeV Emission during X-Ray Flares from Late Internal Shocks: Application
  to GRB 100728A

abstract:
  Recently, the GeV radiation during the X-ray flare activity in GRB 100728A
was detected by Feimi/LAT. Here we study the dynamics and emission properties
of collision between two homogeneous shells based on the late internal shock
model. The GeV photons can be produced from X-ray flare photons up-scattered by
relativistic electrons accelerated by forward-reverse shocks, where involved
radiative processes include synchrotron self-Compton and crossing
inverse-Compton scattering. By analytical and numerical calculations, the
observed spectral properties in GRB 100728A can be well explained.


title:
Charged lepton electric dipole moment enhancement in the Lorentz
  violated extension of the standard model

abstract:
  We consider the Lorentz violated extension of the standard model. In this
framework, there are terms that explicitly violate CP-symmetry. We examine the
CPT-even $d_{\mu\nu}$-term to find the electric dipole moment of charged
leptons. We show that the form factors besides the momentum transfer, depend on
a new Lorentz-scalar, constructing by $d_{\mu\nu}$ and the four momenta of the
lepton, as well. Such an energy dependence of the electric dipole form factor
leads to an enhancement of the lepton electric dipole moment at high energy,
even at the zero momentum transfer. We show that at $\frac{|d|p^2}{m^2_l}\sim
1$ the electric dipole moment of the charged lepton can be as large as
$10^{-14} e\,\,cm$.


title: Closures of positive braids and the Morton-Franks-Williams inequality

abstract:
  We study the Morton-Franks-Williams inequality for closures of simple braids
(also known as positive permutation braids). This allows to prove, in a simple
way, that the set of simple braids is a orthonormal basis for the inner product
of the Hecke algebra of the braid group defined by K\'alm\'an, who first
obtained this result by using an interesting connection with Contact Topology.
  We also introduce a new technique to study the Homflypt polynomial for
closures of positive braids, namely resolution trees whose leaves are simple
braids. In terms of these simple resolution trees, we characterize closed
positive braids for which the Morton-Franks-Williams inequality is strict. In
particular, we determine explicitly the positive braid words on three strands
whose closures have braid index three.


title: Towards a dynamical mass of the ultraluminous X-ray source NGC 5408 X-1

abstract:
  We obtained multi-epoch Very Large Telescope (VLT) optical spectroscopic data
in 2011 and 2012 on the ultraluminous X-ray source (ULX) NGC 5408 X-1. We
confirm that the HeII\lambda4686 line has a broad component with an average
FWHM of v=780\pm64 km/s with a variation of ~13% during observations spanning
over 4 years, and is consistent with the origin in the accretion disc. The
deepest optical spectrum does not reveal any absorption line from a donor star.
Our aim was to measure the radial velocity curve and estimate the parameters of
the binary system. We find an upper limit on the semi-amplitude of the radial
velocity of K=132\pm42 km/s. A search for a periodic signal in the data
resulted in no statistically significant period. The mass function and
constraints on the binary system imply a black hole mass of less than ~510
M_sun. Whilst, a disc irradiation model may imply a black hole mass smaller
than ~431-1985 M_sun, depending on inclination. Our data can also be consistent
with an unexplored orbital period range from a couple of hours to a few days,
thus with a stellar-mass black hole and a subgiant companion.


title:
The human and mammalian cerebrum scale by computational power and
  information resistance

abstract:
  The cerebrum of mammals spans a vast range of sizes and yet has a very
regular structure. The amount of folding of the cortical surface and the
proportion of white matter gradually increase with size, but the underlying
mechanisms remain elusive. Here, two laws are derived to fully explain these
cerebral scaling relations. The first law holds that the long-range information
flow in the cerebrum is determined by the total cortical surface (i.e., the
number of neurons) and the increasing information resistance of long-range
connections. Despite having just one free parameter, the first law fits the
mammalian cerebrum better than any existing function, both across species and
within humans. According to the second law, the white matter volume scales,
with a few minor corrections, to the cortical surface area. It follows from the
first law that large cerebrums have much local processing and little global
information flow. Moreover, paradoxically, a further increase in long-range
connections would decrease the efficiency of information flow.


title: Self-organized criticality in X-ray flares of gamma-ray burst afterglows

abstract:
  X-ray flares detected in nearly half of gamma-ray burst (GRB) afterglows are
one of the most intriguing phenomena in high-energy astrophysics. All the
observations indicate that the central engines of bursts, after the gamma-ray
emission has ended, still have long periods of activity, during which energetic
explosions eject relativistic materials, leading to late-time X-ray emission.
It is thus expected that X-ray flares provide important clues to the nature of
the central engines of GRBs, and more importantly, unveil the physical
mechanism of the flares themselves, which has so far remained mysterious. Here
we report statistical results of X-ray flares of GRBs with known redshifts, and
show that X-ray flares and solar flares share three statistical properties:
power-law frequency distributions for energies, durations, and waiting times.
All of the distributions can be well understood within the physical framework
of a self-organized criticality (SOC) system. The statistical properties of
X-ray flares of GRBs are similar to solar flares, and thus can both be
attributed to a SOC process. Both types of flares may be driven by a magnetic
reconnection process, but X-ray flares of GRBs are produced in ultra-strongly
magnetized millisecond pulsars or long-term hyperaccreting disks around
stellar-mass black holes.


title:
Mirror Energy Differences at Large Isospin Studied through Direct
  Two-Nucleon Knockout

abstract:
  The first spectroscopy of excited states in 52Ni (Tz=2) and 51Co (Tz=-3/2)
has been obtained using the highly selective two-neutron knockout reaction.
Mirror energy differences between isobaric analogue states in these nuclei and
their mirror partners are interpreted in terms of isospin nonconserving
effects. A comparison between large scale shell-model calculations and data
provides the most compelling evidence to date that both electromagnetic and an
additional isospin nonconserving interactions for J=2 couplings, of unknown
origin, are required to obtain good agreement.


title: Rate in Template-directed Polymer Synthesis

abstract:
  We discuss temporal efficiency of template-directed polymer synthesis, such
as DNA replication and transcription, under a given template string. To weigh
the synthesis speed and accuracy on the same scale, we propose a
template-directed synthesis (TDS) rate, which contains an expression analogous
to that for the Shannon entropy. Increasing the synthesis speed accelerates the
TDS rate, but the TDS rate is lowered if the produced sequences are
diversified. We apply the TDS rate to some production system models and
investigate how the balance between the speed and the accuracy is affected by
changes in the system conditions.


title:
Topological invariant for generic 1D time reversal symmetric
  superconductors in class DIII

abstract:
  A one dimensional time reversal symmetric topological superconductor
(symmetry class DIII) features a single Kramers pair of Majorana bound states
at each of its ends. These holographic quasiparticles are non-Abelian anyons
that obey Ising-type braiding statistics. In the special case where an
additional U(1) spin rotation symmetry is present, this state can be understood
as two copies of a Majorana wire in symmetry class D, one copy for each spin
block. We present a manifestly gauge invariant construction of the topological
invariant for the generic case, i.e., in the absence of any additional
symmetries like spin rotation symmetry. Furthermore, we show how the presence
of inversion symmetry simplifies the calcuation of the topological invariant.
The proposed scheme is suitable for the classification of both interacting and
disordered systems and allows for a straightforward numerical evaluation of the
invariant since it does not rely on fixing a continuous phase relation between
Bloch functions. Finally, we apply our method to compute the topological phase
diagram of a Rashba wire with competing s-wave and p-wave superconducting
pairing terms.


title: Diffusion Dynamics with Changing Network Composition

abstract:
  We analyze information diffusion using empirical data that tracks online
communication around two instances of mass political mobilization, including
the year that lapsed in-between the protests. We compare the global properties
of the topological and dynamic networks through which communication took place
as well as local changes in network composition. We show that changes in
network structure underlie aggregated differences on how information diffused:
an increase in network hierarchy is accompanied by a reduction in the average
size of cascades. The increasing hierarchy affects not only the underlying
communication topology but also the more dynamic structure of information
exchange; the increase is especially noticeable amongst certain categories of
nodes (or users). This suggests that the relationship between the structure of
networks and their function in diffusing information is not as straightforward
as some theoretical models of diffusion in networks imply.


title:
Heavy quark pair production in high energy pA collisions: Open heavy
  flavors

abstract:
  We study open heavy flavor meson production in proton-nucleus (pA) collisions
at RHIC and LHC energies within the Color Glass Condensate framework. We use
the unintegrated gluon distribution at small Bjorken's x in the proton obtained
by solving the Balitsky-Kovchegov equation with running coupling correction and
constrained by global fitting of HERA data. We change the initial saturation
scale of the gluon distribution for the heavy nucleus. The gluon distribution
with McLerran-Venugopalan model initial condition is also used for comparison.
We present transverse momentum spectra of single D and B productions in pA
collisions, and the so-called nuclear modification factor. The azimuthal angle
correlation of open heavy flavor meson pair is also computed to study the
modification due to the gluon saturation in the heavy nucleus at the LHC.


title:
On Characterization of Elementary Trapping Sets of Variable-Regular LDPC
  Codes

abstract:
  In this paper, we study the graphical structure of elementary trapping sets
(ETS) of variable-regular low-density parity-check (LDPC) codes. ETSs are known
to be the main cause of error floor in LDPC coding schemes. For the set of LDPC
codes with a given variable node degree $d_l$ and girth $g$, we identify all
the non-isomorphic structures of an arbitrary class of $(a,b)$ ETSs, where $a$
is the number of variable nodes and $b$ is the number of odd-degree check nodes
in the induced subgraph of the ETS. Our study leads to a simple
characterization of dominant classes of ETSs (those with relatively small
values of $a$ and $b$) based on short cycles in the Tanner graph of the code.
For such classes of ETSs, we prove that any set ${\cal S}$ in the class is a
layered superset (LSS) of a short cycle, where the term "layered" is used to
indicate that there is a nested sequence of ETSs that starts from the cycle and
grows, one variable node at a time, to generate ${\cal S}$. This
characterization corresponds to a simple search algorithm that starts from the
short cycles of the graph and finds all the ETSs with LSS property in a
guaranteed fashion. Specific results on the structure of ETSs are presented for
$d_l = 3, 4, 5, 6$, $g = 6, 8$ and $a, b \leq 10$ in this paper. The results of
this paper can be used for the error floor analysis and for the design of LDPC
codes with low error floors.


title: Synchronization for discrete mean-field rotators

abstract:
  We analyze a non-reversible mean-field jump dynamics for discrete q-valued
rotators and show in particular that it exhibits synchronization. The dynamics
is the mean-field analogue of the lattice dynamics investigated by the same
authors in [26] which provides an example of a non-ergodic interacting particle
system on the basis of a mechanism suggested by Maes and Shlosman [32]. Based
on the correspondence to an underlying model of continuous rotators via a
discretization transformation we show the existence of a locally attractive
periodic orbit of rotating measures. We also discuss global attractivity, using
a free energy as a Lyapunov function and the linearization of the ODE which
describes typical behavior of the empirical distribution vector.


title: Representations of affine superalgebras and mock theta functions

abstract:
  We show that the normalized supercharacters of principal admissible modules
over the affine Lie superalgebra $\hat{s\ell}_{2|1}$ (resp.
$\hat{ps\ell}_{2|2}$) can be modified, using Zwegers' real analytic
corrections, to form a modular (resp. $S$-) invariant family of functions.
Applying the quantum Hamiltonian reduction, this leads to a new family of
positive energy modules over the N=2 (resp. N=4) superconformal algebras with
central charge $3(1-\frac{2m+2}{M})$, where $m \in \mathbb{Z}_{\geq 0}$, $M\in
\mathbb{Z}_{\geq 2}$, $\gcd(2m+2,M)=1$ if $m>0$ (resp. $6(\frac{m}{M}-1)$,
where $m \in \mathbb{Z}_{\geq 1}, M\in \mathbb{Z}_{\geq 2}$, $\gcd(2m,M)=1$ if
$m>1$), whose modified characters and supercharacters form a modular invariant
family.


title:
Pattern recognition issues on anisotropic smoothed particle
  hydrodynamics

abstract:
  This is a preliminary theoretical discussion on the computational
requirements of the state of the art smoothed particle hydrodynamics (SPH) from
the optics of pattern recognition and artificial intelligence. It is pointed
out in the present paper that, when including anisotropy detection to improve
resolution on shock layer, SPH is a very peculiar case of unsupervised machine
learning. On the other hand, the free particle nature of SPH opens an
opportunity for artificial intelligence to study particles as agents acting in
a collaborative framework in which the timed outcomes of a fluid simulation
forms a large knowledge base, which might be very attractive in computational
astrophysics phenomenological problems like self-propagating star formation.


title: Criteria for posterior consistency

abstract:
  Frequentist conditions for asymptotic suitability of Bayesian procedures
focus on lower bounds for prior mass in Kullback-Leibler neighbourhoods of the
data distribution. The goal of this paper is to investigate the flexibility in
criteria for posterior consistency with i.i.d. data. We formulate a versatile
posterior consistency theorem that applies both to well- and mis-specified
models and which we use to re-derive Schwartz's theorem, consider
Kullback-Leibler consistency and formulate consistency theorems in which priors
charge metric balls. It is generalized to sieved models with Barron's
negligible prior mass condition and to separable models with variations on
Walker's consistency theorem. Results also apply to marginal semi-parametric
consistency: support boundary estimation is considered explicitly and
consistency is proved in a model for which Kullback-Leibler priors do not
exist. Other examples include consistent density estimation in mixture models
with Dirichlet or Gibbs-type priors of full weak support. Regarding posterior
convergence at a rate, it is shown that under a mild integrability condition,
the second-order Ghosal-Ghosh-van der Vaart prior mass condition can be relaxed
to a lower bound to the prior mass in Schwartz's Kullback-Leibler
neighbourhoods. The posterior rate of convergence is derived in a simple,
parametric model for heavy-tailed distributions in which the Ghosal-Ghosh-van
der Vaart condition cannot be satisfied by any prior.


title:
A Multidimensional Hilbert-Type Integral Inequality Related to the
  Riemann Zeta Function

abstract:
  In this paper,using methods of weight functions and techniques of real
analysis, we provide a multidimensional Hilbert-type integral inequality with a
homogeneous kernel of degree 0 as well as a best possible constant factor
related to the Riemann zeta function. Some equivalent representations and
certain reverses are obtained. Furthermore, we also consider operator
expressions with the norm and some particular results.


title: AdS vacua with scale separation from IIB supergravity

abstract:
  Only two kinds of compactification are known that lead to four-dimensional
supersymmetric AdS vacua with moduli stabilisation and separation of scales at
tree-level. The most studied ones are compactifications of massive IIA
supergravity on SU(3) structures with smeared O6 planes, for which a general
ten-dimensional expression for the solution in terms of the SU(3) structure was
found. Less studied are compactifications of IIB supergravity with smeared
O5/O7 planes. In this paper we derive a general ten-dimensional expression for
the smeared O5/O7 solutions in terms of SU(2) structures. For a specific choice
of orientifold projections, we recover the known examples and we also provide
new explicit solutions.


title:
Unitary representations of GL(n,K) distinguished by a Galois involution,
  for K a p-adic field

abstract:
  Let $F$ be a $p$-adic field, and $K$ a quadratic extension of $F$. Using
Tadic's classification of the unitary dual of $GL(n,K)$, we give the list of
irreducible unitary representations of this group distinguished by $GL(n,F)$,
in terms of distinguished discrete series. As it is known that a generalised
Steinberg representation $St(k,\rho)$ is distinguished if and only if the
cuspidal representation $\rho$ is $\eta^{k-1}$-distinguished, for $\eta$ the
character of $F^*$ with kernel the norms of $K^*$, this actually gives a
classification of distinguished unitary representations in terms of
distinguished cuspidal representations.


title:
Projective normality and the generation of the ideal of an Enriques
  surface

abstract:
  We give necessary and sufficient criteria for a smooth Enriques surface S in
P^r to be scheme-theoretically an intersection of quadrics. Moreover we prove
in many cases that, when S contains plane cubic curves, the intersection of the
quadrics containing S is the union of S and the 2-planes spanned by the plane
cubic curves. We also give a new (very quick) proof of the projective normality
of S if the degree of S is at least 12.


title:
Primordial black hole production during preheating in a chaotic
  inflationary model

abstract:
  In this paper we review the production of primordial black holes (PBHs)
during preheating after a chaotic inflationary model. All relevant equations of
motion are solved numerically in a modified version of HLattice, and we then
calculate the mass variance to determine structure formation during preheating.
It is found that production of PBHs can be a generic result of the model, even
though the results seem to be sensitive to the values of the smoothing scale.
We consider a constraint for overproduction of PBHs that could uncover some
stress between inflation-preheating models and observations.


title:
On b-bit min-wise hashing for large-scale regression and classification
  with sparse data

abstract:
  Large-scale regression problems where both the number of variables, $p$, and
the number of observations, $n$, may be large and in the order of millions or
more, are becoming increasingly more common. Typically the data are sparse:
only a fraction of a percent of the entries in the design matrix are non-zero.
Nevertheless, often the only computationally feasible approach is to perform
dimension reduction to obtain a new design matrix with far fewer columns and
then work with this compressed data.
  $b$-bit min-wise hashing (Li and Konig, 2011) is a promising dimension
reduction scheme for sparse matrices which produces a set of random features
such that regression on the resulting design matrix approximates a kernel
regression with the resemblance kernel. In this work, we derive bounds on the
prediction error of such regressions. For both linear and logistic models we
show that the average prediction error vanishes asymptotically as long as $q
\|\beta^*\|_2^2 /n \rightarrow 0$, where $q$ is the average number of non-zero
entries in each row of the design matrix and $\beta^*$ is the coefficient of
the linear predictor.
  We also show that ordinary least squares or ridge regression applied to the
reduced data can in fact allow us fit more flexible models. We obtain
non-asymptotic prediction error bounds for interaction models and for models
where an unknown row normalisation must be applied in order for the signal to
be linear in the predictors.


title: PT-symmetry and Transparency

abstract:
  It is known that the perfect absorption of two identical waves incident on a
complex potential from left and right can occur at a fixed real energy and that
the time-reversed setting of this system would act as a laser at threshold at
the same energy. Here, we argue and show that PT-symmetric potentials are
exceptional in this regard which do not allow Coherent Perfect Absorption
without lasing as the modulus of the determinant of the $S$-matrix, $|\det S|$,
becomes 1, for all positive energies. Next we show that in the parametric
regimes where the PT-symmetry is unbroken, the eigenvalues, $s_\pm$ of $S$, can
become unitary (uni-modular) for all energies. Then the potential becomes
coherent perfect emitter on both sides for any energy of coherent injection. We
call this property Transparency.


title:
A new model of filtration and macromolecules transport across capillary
  walls

abstract:
  Metabolic substrates, such as oxygen and glucose, are rapidly delivered to
the cell through filtration across microvessels walls. Modelling this important
process is complicated by the coupling between flow and transport equations,
which are linked through the osmotic pressure induced by the colloidal plasma
proteins. Microvessel wall is a composite media with the internal glycocalyx
layer exerting a remarkable sieving effect on macromolecules, with respect to
the external layer composed by endothelial cells. The physiological structure
of microvessel is represented as the superimposition of two membranes with
different properties; the inner membrane represents the glycocalyx, while the
outer membrane represents the surrounding endothelial cells. Application of
mass conservation principle and thermodynamic considerations lead to a model
composed by two coupled second-order partial differential equations in the
hydrostatic and osmotic pressures, one expressing volumetric mass conservation
and the other, which is non-linear, expressing macromolecules mass
conservation. Despite system complexity, the assumption that the properties of
the layers are piece-wise constant allows us to obtain analytical solutions for
the two pressures. This solution is in agreement with experimental
observations, which contrary to common belief, show that flow reversal cannot
occur in steady state unless luminal hydrostatic pressure drops below
physiologically plausible values. The observed variations of volumetric and
solute mass flux in case of a significant reduction of luminal hydrostatic
pressure are in qualitative agreement with observed variations during
experiments reported in the literature. On the other hand, homogenising
microvessel wall into a single-layer membrane with equivalent properties leads
to a different distribution of pressure across microvessel wall, not consistent
with observations.


title:
AD 775 Pulse of Cosmogenic Radionuclides Production as Imprint of a
  Galactic Gamma-Ray Burst

abstract:
  We suggest an explanation of a sharp increase in the abundance of cosmogenic
radiocarbon found in tree rings dated AD 775. The increase could originate from
high-energy irradiation of the atmosphere by a galactic gamma-ray burst. We
argue that, unlike a cosmic ray event, a gamma-ray burst does not necessarily
result in a substantial increase in long-lived 10Be atmospheric production. At
the same time, the 36Cl nuclide would be generated in the amounts detectable in
the corresponding ice core samples from Greenland and Antarctica. These
peculiar features allow experimental discrimination of nuclide effects caused
by gamma-ray bursts and by powerful proton events.


title:
Lithium incorporation at the MoS2/graphene interface: an ab initio
  investigation

abstract:
  Based on ab initio calculations, we examine the incorporation of Li atoms in
the MoS2/graphene interface. We find that the intercalated Li atoms are
energetically more stable than Li atoms adsorbed on the MoS2 surface. The
intercalated atoms interact with both graphene sheet and MoS2 layer, increasing
the Li binding energies. However, the equilibrium geometries are ruled by the
MoS2 layer, where the intercalated Li atoms lie on the top (Li_T) and hollow
(Li_H) sites of the MoS2 layer. We calculate the Li diffusion barriers, along
the Li_T -> Li_H diffusion path, where we find similar energy barriers compared
with that obtained for Li adatoms on the MoS2 surface. Our results allow us to
infer that the Li storage capacity increases at MoS2/G interfaces, in
comparison with Li adatoms on the MoS2 surface, however, with no reduction on
the mobility of the intercalated Li atoms. Those properties are
interesting/useful to the development of Li batteries based on MoS2.


title:
Electron-Cloud Effects in past and future machines - walk through 50
  years of Electron-Cloud studies

abstract:
  Past electron-cloud (e-cloud) observations, studies and mitigation techniques
are quickly reviewed along with some ongoing code developments, the preceding
ECLOUD workshops, recent contacts with the spacecraft community, the important
role of Francesco Ruggiero, and a few current electron-cloud topics discussed
at ECLOUD12 in La Biodola.


title: Dual Representation of Minimal Supersolutions of Convex BSDEs

abstract:
  We give a dual representation of minimal supersolutions of BSDEs with
non-bounded, but integrable terminal conditions and under weak requirements on
the generator which is allowed to depend on the value process of the equation.
Conversely, we show that any dynamic risk measure satisfying such a dual
representation stems from a BSDE. We also give a condition under which a
supersolution of a BSDE is even a solution.


title:
Affinoids in the Lubin-Tate perfectoid space and simple supercuspidal
  representations I: tame case

abstract:
  We construct a family of affinoids in the Lubin-Tate perfectoid space and
their formal models such that the middle cohomology of the reductions of the
formal models realizes the local Langlands correspondence and the local
Jacquet-Langlands correspondence for simple supercuspidal representations in
the case where the dimension of Galois representations is prime to the residue
characteristic. The reductions of the formal models are isomorphic to the
perfections of Artin-Schreier varieties associated to quadratic forms.


title:
Branching fraction and CP asymmetry of the decays $B^+ \to K_{\rm
  \scriptscriptstyle S}^0 \pi^+$ and $B^+ \to K_{\rm \scriptscriptstyle S}^0
  K^+$

abstract:
  An analysis of $B^+ \to K_{\rm \scriptscriptstyle S}^0 \pi^+$ and $B^+ \to
K_{\rm \scriptscriptstyle S}^0 K^+$ decays is performed with the LHCb
experiment. The $pp$ collision data used correspond to integrated luminosities
of $1{\,fb}^{-1}$ and $2{\,fb}^{-1}$ collected at centre-of-mass energies of
$\sqrt{s}=7\mathrm{\,Te\kern -0.1em V}$ and $\sqrt{s}=8\mathrm{\,Te\kern -0.1em
V}$, respectively. The ratio of branching fractions and the direct {\it CP}
asymmetries are measured to be $\mathcal{B}(B^+ \to K_{\rm \scriptscriptstyle
S}^0 K^+)/\mathcal{B}(B^+ \to K_{\rm \scriptscriptstyle S}^0 \pi^+) = 0.064 \pm
0.009\textrm{(stat.)} \pm 0.004\textrm{(syst.)}$, $\mathcal{A}^{\it CP}(B^+ \to
K_{\rm \scriptscriptstyle S}^0 \pi^+) = -0.022 \pm 0.025\textrm{(stat.)} \pm
0.010\textrm{(syst.)}$ and $\mathcal{A}^{\it CP}(B^+ \to K_{\rm
\scriptscriptstyle S}^0 K^+) = -0.21 \pm 0.14\textrm{(stat.)} \pm
0.01\textrm{(syst.)}$. The data sample taken at $\sqrt{s}=7\mathrm{\,Te\kern
-0.1em V}$ is used to search for $B_c^+ \to K_{\rm \scriptscriptstyle S}^0 K^+$
decays and results in the upper limit $(f_c\cdot\mathcal{B}(B_c^+ \to K_{\rm
\scriptscriptstyle S}^0 K^+))/(f_u\cdot\mathcal{B}(B^+ \to K_{\rm
\scriptscriptstyle S}^0 \pi^+)) < 5.8\times10^{-2}\textrm{at 90% confidence
level}$, where $f_c$ and $f_u$ denote the hadronisation fractions of a
$\bar{b}$ quark into a $B_c^+$ or a $B^+$ meson, respectively.


title: Second Order Standard Model

abstract:
  We rewrite the Lagrangian of the fermionic sector of the Standard Model in a
novel compact form. The new Lagrangian is second order in derivatives, and is
obtained from the usual first order Lagrangian by integrating out all primed
(or dotted) 2-component spinors. The Higgs field enters the new Lagrangian
non-polynomially, very much like the metric enters the Einstein-Hilbert
Lagrangian of General Relativity. We also discuss unification in the second
order formalism, and describe a natural in this framework SU(2)xSU(4) unified
theory.


title: Barycentric Coordinates as Interpolants

abstract:
  Barycentric coordinates are frequently used as interpolants to shade computer
graphics images. A simple equation transforms barycentric coordinates from
screen space into eye space in order to undo the perspective transformation and
permit accurate interpolative shading of texture maps. This technique is
amenable to computation using a block-normalized integer representation.


title:
A double neutron star merger origin for the cosmological relativistic
  fading source PTF11agg?

abstract:
  The Palomar Transient Factory (PTF) team recently reported the discovery of a
rapidly fading optical transient source, PTF11agg. A long-lived scintillating
radio counterpart was identified, but the search for a high energy counterpart
showed negative results. The PTF team speculated that PTF11agg may represent a
new class of relativistic outbursts. Here we suggest that a neutron star
(NS)-NS merger system with a supra-massive magnetar central engine could be a
possible source to power such a transient, if our line of sight is not on the
jet axis direction of the system. These systems are also top candidates for
gravitational wave sources to be detected in the advanced LIGO/Virgo era. We
find that the PTF11agg data could be explained well with such a model,
suggesting that at least some gravitational wave bursts due to NS-NS mergers
may be associated with such a bright electromagnetic counterpart without a
\gamma-ray trigger.


title: Global Life Patterns: A Methodology for Designing a Personal Global Life

abstract:
  In this paper, we propose the Global Life Patterns, a methodology to support
people to maintain individuality and design their own actions in respect to the
"globalizing" society - a Global Life. Today, globalization requires each
person to maintain individuality in respect to Globalization. Because methods
to acquire such ability are tacit, a clarified methodology to live a Global
Life is needed.This methodology is based on the format of a Pattern Language -
specifically, this methodology is in the format of the Pattern Language 3.0
(Iba, 2012).


title: X-ray variability and energy spectra from NGC5408 X-1 with XMM-Newton

abstract:
  The notion of source states characterizing the X-ray emission from black hole
binaries has revealed to be a very useful tool to disentangle the complex
spectral and aperiodic phenomenology displayed by those classes of accreting
objects. We seek to use the same tools for Ultra-Luminous X-ray (ULX) sources.
We analyzed the data from the longest observations obtained from the ULX source
in NGC 5408 (NGC 5408 X-1) taken by XMM-Newton. We performed a study of the
timing and spectral properties of the source. In accordance with previous
studies on similar sources, the intrinsic energy spectra of the source are well
described by a cold accretion disc emission plus a curved high-energy emission
component. We studied the broad-band noise variability of the source and found
an anti-correlation between the root mean square variability in the
0.0001-0.2Hz and intensity, similarly to what is observed in black-hole
binaries during the hard states. We discuss the physical processes responsible
for the X-ray features observed and suggest that NGC 5408 X-1 harbors a black
hole accreting in an unusual bright hard-intermediate state.