title:
An open dataset for research on audio field recording archives:
  freefield1010

abstract:
  We introduce a free and open dataset of 7690 audio clips sampled from the
field-recording tag in the Freesound audio archive. The dataset is designed for
use in research related to data mining in audio archives of field recordings /
soundscapes. Audio is standardised, and audio and metadata are Creative Commons
licensed. We describe the data preparation process, characterise the dataset
descriptively, and illustrate its use through an auto-tagging experiment.


title: Reversible work extraction in a hybrid opto-mechanical system

abstract:
  With the progress of nano-technology, thermodynamics also has to be scaled
down, calling for specific protocols to extract and measure work. Usually, such
protocols involve the action of an external, classical field (the battery) of
infinite energy, that controls the energy levels of a small quantum system (the
calorific fluid). Here we suggest a realistic device to reversibly extract work
in a battery of finite energy : a hybrid optomechanical system. Such devices
consist in an optically active two-level quantum system interacting strongly
with a nano-mechanical oscillator that provides and stores mechanical work,
playing the role of the battery. We identify protocols where the battery
exchanges large, measurable amounts of work with the quantum emitter without
getting entangled with it. When the quantum emitter is coupled to a thermal
bath, we show that thermodynamic reversibility is attainable with
state-of-the-art devices, paving the road towards the realization of a full
cycle of information-to-energy conversion at the single bit level.


title:
Rigidity for $C^1$ actions on the interval arising from hyperbolicity I:
  solvable groups

abstract:
  We consider Abelian-by-cyclic groups for which the cyclic factor acts by
hyperbolic automorphisms on the Abelian subgroup. We show that if such a group
acts faithfully by $C^1$ diffeomorphisms of the closed interval with no global
fixed point at the interior, then the action is topologically conjugated to
that of an affine group. Moreover, in case of non-Abelian image, we show a
rigidity result concerning the multipliers of the homotheties, despite the fact
that the conjugacy is not necessarily smooth. Some consequences for
non-solvable groups are proposed. In particular, we give new proofs/examples
yielding the existence of finitely-generated, locally-indicable groups with no
faithful action by $C^1$ diffeomorphisms of the interval.


title:
Measurement of Collins asymmetries in inclusive production of charged
  pion pairs in e^+e^- annihilation at BABAR

abstract:
  We present measurements of Collins asymmetries in the inclusive process e+e-
-->pi pi X, where pi stands for charged pions, at a center-of-mass energy of
10.6 GeV. We use a data sample of 468 fb-1 collected by the BABAR experiment at
the PEP-II B factory at SLAC, and consider pairs of charged pions produced in
opposite hemispheres of hadronic events. We observe clear asymmetries in the
distributions of the azimuthal angles in two distinct reference frames. We
study the dependence of the asymmetry on several kinematic variables, finding
that it increases with increasing pion momentum and momentum transverse to the
analysis axis, and with increasing angle between the thrust and beam axis.


title:
Two rigidity percolation transitions on binary Bethe networks and the
  intermediate phase in glass

abstract:
  Rigidity Percolation is studied analytically on randomly bonded networks with
two types of nodes, respectively with coordination numbers $z_1$ and $z_2$, and
with $g_1$ and $g_2$ degrees of freedom each. For certain cases that model
chalcogenide glass networks, two transitions, both of first order, are found,
with the first transition usually rather weak. The ensuing intermediate pase,
although is not isostatic in its entirety, has very low self-stress. Our
results suggest a possible mechanism for the appearance of intermediate phases
in glass, that does not depend on a self-organization principle.


title: On the real representations of the Poincare group

abstract:
  The formulation of quantum mechanics with a complex Hilbert space is
equivalent to a formulation with a real Hilbert space and particular density
matrix and observables. We study the real representations of the Poincare
group, motivated by the fact that the localization of complex unitary
representations of the Poincare group is incompatible with causality, Poincare
covariance and energy positivity.
  We review the map from the complex to the real irreducible
representations---finite-dimensional or unitary---of a Lie group on a Hilbert
space. Then we show that all the finite-dimensional real representations of the
identity component of the Lorentz group are also representations of the parity,
in contrast with many complex representations.
  We show that any localizable unitary representation of the Poincare group,
compatible with Poincare covariance, verifies: 1) it is a direct sum of
irreducible representations which are massive or massless with discrete
helicity. 2) it respects causality; 3) if it is complex it contains necessarily
both positive and negative energy subrepresentations 4) it is an irreducible
representation of the Poincare group (including parity) if and only if it is:
a)real and b)massive with spin 1/2 or massless with helicity 1/2. Finally, the
energy positivity problem is discussed in a many-particles context.


title: Quantum chaotic subdiffusion in random potentials

abstract:
  Two interacting particles (TIP) in a disordered chain propagate beyond the
single particle localization length $\xi_1$ up to a scale $\xi_2 > \xi_1$. An
initially strongly localized TIP state expands almost ballistically up to
$\xi_1$. The expansion of the TIP wave function beyond the distance $\xi_1 \gg
1$ is governed by highly connected Fock states in the space of noninteracting
eigenfunctions. The resulting dynamics is subdiffusive, and the second moment
grows as $m_2 \sim t^{1/2}$, precisely as in the strong chaos regime for
corresponding nonlinear wave equations. This surprising outcome stems from the
huge Fock connectivity and resulting quantum chaos. The TIP expansion finally
slows down towards a complete halt -- in contrast to the nonlinear case.


title:
On solutions for derivations of a Noetherian k-algebra and local
  simplicity

abstract:
  We introduce a general notion of solution for a Noetherian differential
$k$-algebra and study its relationship with simplicity, where k is an
algebraically closed field; then we analyze conditions under which such
solutions may exist and be unique, with special emphasis in the cases of
k-algebras of finite type and formal series rings over k. Using that notion we
generalize a criterion for simplicity due to Brumatti-Lequain-Levcovitz and
give a geometric characterization of that; as an application we give a new
proof of a classification theorem for local simplicity due to Hart and obtain a
general result for simplicity of formal series rings over k


title:
Control of ferromagnetism by manipulating the carrier wavefunction in
  ferromagnetic semiconductor (In,Fe)As quantum wells

abstract:
  We demonstrated the control of ferromagnetism in a surface quantum well
containing a 5-nm-thick n-type ferromagnetic semiconductor (In,Fe)As layer
sandwiched between two InAs layers, by manipulating the carrier wavefunction.
The Curie temperature (Tc) of the (In,Fe)As layer was effectively changed by up
to 12 K ({\Delta}Tc/Tc = 55%). Our calculation using the mean-field Zener
theory reveals an unexpectedly large s-d exchange interaction in (In,Fe)As. Our
results establish an effective way to control the ferromagnetism in quantum
heterostructures of n-type FMSs, as well as require reconsideration on the
current understanding of the s-d exchange interaction in narrow gap FMSs.


title:
Extremely correlated Fermi liquid theory meets Dynamical mean-field
  theory: Analytical insights into the doping-driven Mott transition

abstract:
  We consider a doped Mott insulator in the large dimensionality limit within
both the recently developed Extremely Correlated Fermi Liquid (ECFL) theory and
the Dynamical Mean-Field Theory (DMFT). We show that the general structure of
the ECFL sheds light on the rich frequency-dependence of the DMFT self-energy.
Using the leading Fermi-liquid form of the two key auxiliary functions
introduced in the ECFL theory, we obtain an analytical ansatz which provides a
good quantitative description of the DMFT self-energy down to hole doping level
0.2. In particular, the deviation from Fermi-liquid behavior and the
corresponding particle-hole asymmetry developing at a low energy scale are well
reproduced by this ansatz. The DMFT being exact at large dimensionality, our
study also provides a benchmark of the ECFL in this limit. We find that the
main features of the self-energy and spectral line-shape are well reproduced by
the ECFL calculations in the O(\lambda^2) `minimal scheme', for not too low
doping level >0.3. The DMFT calculations reported here are performed using a
state-of-the-art numerical renormalization-group impurity solver, which yields
accurate results down to an unprecedentedly small doping level 0.001.


title: New Approach to Derive the Value Function of a Firm with Exit Option

abstract:
  In this paper we propose a new way of proving the value of a firm that is
currently producing a certain product and faces the option to exit the market.
  The problem of optimal exiting is an optimal stopping problem, that can be
solved using the dynamic programming principle. This approach leads to a
partial differential equation, called the Hamilton-Jacobi-Bellman equation.
  This is a free-boundary problem, and therefore, we propose an approximation
for the original model. We prove the convergence of the solution of the
approximated problem to the original one and finally, using the Implicit
Function Theorem, we obtain this solution.


title:
On the connection between radio and gamma rays. Variability and
  polarization properties in relativistic jets

abstract:
  Relativistic jets are one of the most powerful manifestations of the release
of energy produced around supermassive black holes at the centre of active
galactic nuclei (AGN). Their emission is observed across the entire
electromagnetic spectrum, from the radio band to gamma rays. Despite decades of
efforts, many aspects of the physics of relativistic jets remain elusive. In
particular, the location and the mechanisms responsible for the high-energy
emission and the connection of the variability at different wavelengths are
among the greatest challenges in the study of AGN. From the comparison of the
radio and gamma-ray light curves of gamma-ray flaring objects, there is
evidence that some flares, either in radio or in gamma rays, have not an
obvious connection at the other extreme of the electromagnetic spectrum, like
in the case of the Narrow-Line Seyfert 1 SBS 0846+513. An intriguing aspect
pointed out by high resolution radio observations is the change of the
polarization properties close in time with some high energy flares. In
particular, in PKS 1510-089 and 3C 454.3 a rotation of almost 90 degrees has
been observed after strong gamma-ray flares. The swing of the polarization
angle may be related either to the propagation of a shock along the jet that
orders the magnetic field, or a change of the opacity regime.


title:
Ground state and Spin-Wave dynamics in Brownmillerite SrCoO2.5, A
  combined Hybrid Functional and LSDAU study

abstract:
  We theoretically investigate the ground state magnetic properties of the
brownmillerite phase of SrCoO2.5. Strong correlations within Co d electrons are
treated within the local spin density approximations of Density Functional
theory (DFT) with Hubbard U corrections (LSDAU) and results are compared with
the Heyd Scuzeria Ernzerhof (HSE) functional. The parameters computed with a U
value of 7.5 eV are found to match closely to those computed within the HSE
functional. A G type antiferromagnetic structure is found to be the most stable
one, consistent with experimental observation. By mapping the total energies of
different magnetic configurations onto a Heisenberg Hamiltonian we compute the
magnetic exchange interaction parameters, J, between the nearest neighbor Co
atoms. The J s obtained are then used to compute the spin wave frequencies and
inelastic neutron scattering intensities. Among four spin wave branches, the
lowest energy mode was found to have the largest scattering intensity at the
magnetic zone center, while the other modes becomes dominant at different
momenta. These predictions can be tested by experimentally.


title:
Steadfast perpendicular exchange coupling in an ultrathin CoO/PtFe
  double-layer: strain and spin orientation

abstract:
  We report on the exchange coupling and magnetic properties of a strained
ultrathin CoO/PtFe double-layer with perpendicular magnetic anisotropy. The
cobalt oxide growth by reactive molecular beam epitaxy on a Pt-terminated
PtFe/Pt(001) surface gives rise to an hexagonal surface and a monoclinic
distorted CoO 3nm film at room temperature. This distorted ultrathin CoO layer
couples with the PtFe(001) layer establishing a robust perpendicular exchange
bias shift. Soft x-ray absorption spectroscopy provides a full description of
the spin orientations in the CoO/PtFe doublelayer. The exchange bias shift is
preserved up to the Neel antiferromagnetic ordering temperature of TN=293 K.
This unique example of selfsame value for blocking and ordering temperatures,
yet identical to the bulk ordering temperature, is likely related to the
original strain induced distortion and strengthened interaction between the two
well-ordered spin layers.


title:
Magnetic Geometry and Physics of Advanced Divertors: The X-Divertor and
  the Snowflake

abstract:
  Advanced divertors are magnetic geometries where a second X-point is added in
the divertor region to address the serious challenges of burning plasma power
exhaust. Invoking physical arguments, numerical work, and detailed model
magnetic field analysis, we investigate the magnetic field structure of
advanced divertors in the physically relevant region for power exhaust - the
Scrape-Off Layer (SOL). A primary result of our analysis is the emergence of a
physical "metric", the Divertor Index DI, that quantifies the flux expansion
increase as one goes from the main X-point to the strike point. It clearly
separates three geometries with distinct consequences for divertor physics -
the Standard Divertor (SD, DI = 1), and two advanced geometries: the X-Divertor
(XD, DI > 1) and the Snowflake (SFD, DI < 1). The XD, therefore, cannot be
classified as one variant of the Snowflake. By this measure, recent NSTX and
DIIID experiments are X-Divertors, not Snowflakes.


title: An introduction to the Europe Media Monitor family of applications

abstract:
  Most large organizations have dedicated departments that monitor the media to
keep up-to-date with relevant developments and to keep an eye on how they are
represented in the news. Part of this media monitoring work can be automated.
In the European Union with its 23 official languages, it is particularly
important to cover media reports in many languages in order to capture the
complementary news content published in the different countries. It is also
important to be able to access the news content across languages and to merge
the extracted information. We present here the four publicly accessible systems
of the Europe Media Monitor (EMM) family of applications, which cover between
19 and 50 languages (see http://press.jrc.it/overview.html). We give an
overview of their functionality and discuss some of the implications of the
fact that they cover quite so many languages. We discuss design issues
necessary to be able to achieve this high multilinguality, as well as the
benefits of this multilinguality.


title:
The effects of magnetic field, age, and intrinsic luminosity on
  Crab-like pulsar wind nebulae

abstract:
  We investigate the time-dependent behavior of Crab-like pulsar wind nebulae
(PWNe) generating a set of models using 4 different initial spin-down
luminosities ($L_0 =\{1,0.1,0.01,0.001\} \times L_{0, {\rm Crab}}$), 8 values
of magnetic fraction ($\eta =$ 0.001, 0.01, 0.03, 0.1, 0.5, 0.9, 0.99, and
0.999, i.e., from fully particle dominated to fully magnetically dominated
nebulae), and 3 distinctive ages: 940, 3000, and 9000 years. We find that the
self-synchrotron Compton (SSC) contribution is irrelevant for $L_{SD}$=0.1, 1,
and 10% of the Crab power, disregarding the age and the magnetic fraction. SSC
only becomes relevant for highly energetic ($\sim 70%$ of the Crab), particle
dominated nebulae at low ages (of less than a few kyr), located in a FIR
background with relatively low energy density. Since no pulsar other than Crab
is known to have these features, these results clarify why the Crab Nebula, and
only it, is SSC dominated. No young PWN would be detectable at TeV energies if
the pulsar's spin-down power is 0.1% Crab or lower. For 1% of the Crab
spin-down, only particle dominated nebulae can be detected by H.E.S.S.-like
telescopes when young enough (with details depending on the precise injection
and environmental parameters). Above 10% of the Crab's power, all PWNe are
detectable by H.E.S.S.-like telescopes if they are particle dominated, no
matter the age. The impact of the magnetic fraction on the final SED is varied
and important, generating order of magnitude variations in the luminosity
output for systems that are otherwise the same (equal $P$, $\dot P$, injection,
and environment).


title: Speeding up Deciphering by Hypergraph Ordering

abstract:
  The "Gluing Algorithm" of Semaev [Des.\ Codes Cryptogr.\ 49 (2008), 47--60]
--- that finds all solutions of a sparse system of linear equations over the
Galois field $GF(q)$ --- has average running time $O(mq^{\max \left\vert
\cup_{1}^{k}X_{j}\right\vert -k}), $ where $m$ is the total number of
equations, and $\cup_{1}^{k}X_{j}$ is the set of all unknowns actively
occurring in the first $k$ equations. Our goal here is to minimize the exponent
of $q$ in the case where every equation contains at most three unknowns.
%Applying hypergraph-theoretic methods we prove The main result states that if
the total number $\left\vert \cup_{1}^{m}X_{j}\right\vert$ of unknowns is equal
to $m$, then the best achievable exponent is between $c_1m$ and $c_2m$ for some
positive constants $c_1$ and $c_2.$


title: Fourth-order dispersive systems on the one-dimensional torus

abstract:
  We present the necessary and sufficient conditions of the well-posedness of
the initial value problem for certain fourth-order linear dispersive systems on
the one-dimensional torus. This system is related with a dispersive flow for
closed curves into compact Riemann surfaces. For this reason, we study not only
the general case but also the corresponding special case in detail. We apply
our results on the linear systems to the fourth-order dispersive flows. We see
that if the sectional curvature of the target Riemann surface is constant, then
the equation of the dispersive flow satisfies our conditions of the
well-posedness.


title: Coexistence and Transition between Shear Zones in Slow Granular Flows

abstract:
  We report experiments on slow granular flows in a split-bottom Couette cell
that show novel strain localization features. Nontrivial flow profiles have
been observed which are shown to be the consequence of simultaneous formation
of shear zones in the bulk and at the boundaries. The fluctuating band model
based on a minimization principle can be fitted to the experiments over a large
variation of morphology and filling height with one single fit parameter, the
relative friction coefficient between wall and bulk. The possibility of
multiple shear zone formation is controlled by the relative friction. Moreover,
we observe that the symmetry of an initial state, with coexisting shear zones
at both side walls, breaks spontaneously below a threshold value of the shear
velocity. A dynamical transition between two asymmetric flow states happens
over a characteristic time scale which depends on the shear strength.


title: On detection of the free inner core nutation from VLBI data

abstract:
  Several attempts to discover the FICN signal in VLBI nutation series made
during last years failed. In this paper, we present some results of our further
steps in this direction, unfortunately not successful either. We investigated
several VLBI CPO series by means of spectral and wavelet analysis. It has been
shown that there are several periodic signals with close amplitude around the
expected FICN period without any prevailing one that can be reliably associated
with the FICN. The most interesting for further analysis is a relatively stable
oscillation with period of 800 days, which is, however, beyond the intervals
predicted in other studies cited above. It seems to be necessary to improve
theoretical estimates of the FICN period to make its search in the
observational data more promising.


title: Diophantine approximation on lines with prime constraints

abstract:
  We study the problem of Diophantine approximation on lines in R^2 with prime
numerator and denominator.


title:
JLab Measurement of the $^4$He Charge Form Factor at Large Momentum
  Transfers

abstract:
  The charge form factor of $^$4He has been extracted in the range 29 fm$^{-2}$
$\le Q^2 \le 77$ fm$^{-2}$ from elastic electron scattering, detecting $^4$He
nuclei and electrons in coincidence with the High Resolution Spectrometers of
the Hall A Facility of Jefferson Lab. The results are in qualitative agreement
with realistic meson-nucleon theoretical calculations. The data have uncovered
a second diffraction minimum, which was predicted in the $Q^2$ range of this
experiment, and rule out conclusively long-standing predictions of dimensional
scaling of high-energy amplitudes using quark counting.


title: On the Galactic aberration constant

abstract:
  In this work, we analyzed all available determinations of the Galactic
rotation parameters $R_0$ and $\Omega_0$ made during last 10 years to derive
the most probable value of the Galactic aberration constant $A = R_0
\Omega_0^2/c$. We used several statistical methods to obtain reliable estimates
of $R_0$ and $\Omega_0$ and their realistic errors. In result, we have obtained
the value of $A = 5.0 \pm 0.3$ $\mu$as/yr as the current best estimate of the
GA constant. We suggest that the proposed value of the GA constant can be
safely used in practice during coming years.


title: Confinement and duality in supersymmetric gauge theories

abstract:
  In this thesis we review the Seiberg-Witten solution of four dimensional N=2
gauge theories, the six-dimensional construction of these models recently
proposed by Gaiotto and the BPS quiver technique for the determination of the
BPS spectrum of N=2 theories. We then study how these recent developments allow
to better understand nonperturbative aspects such as confinement and dynamical
symmetry breaking in the N=1 theories obtained starting from N=2 SQCD and
adding a mass term for the chiral multiplet in the adjoint of the gauge group.
We find an unusual realization of the 't Hooft-Mandelstam mechanism, in which
confinement and dynamical symmetry breaking are due to the condensation of
different degrees of freedom.


title: Periodic and Aperoidic Variability in the Molecular Cloud \rho Ophiuchus

abstract:
  Presented are the results of a near-IR photometric survey on 1678 stars in
the direction of the \rho Ophiuchus (\rho Oph) star forming region using data
from the 2MASS Calibration Database. For each target in this sample, up to 1584
individual J, H and K_s band photometric measurements with a cadence of ~1 day
are obtained over 3 observing seasons spanning ~2.5 years; it is the most
intensive survey of stars in this region to date. This survey identifies 101
variable stars with \Delta K_s band amplitudes from 0.044 to 2.31 mag and
\Delta(J-K_s) color amplitudes ranging from 0.053 to 1.47 mag. Of the 72 young
\rho Oph star cluster members included in this survey, 79% are variable; in
addition, 22 variable stars are identified as candidate members. Based on the
temporal behavior of the K_s time-series, the variability is distinguished as
either periodic, long time-scale or irregular. This temporal behavior coupled
with the behavior of stellar colors is used to assign a dominant variability
mechanism. A new period-searching algorithm finds periodic signals in 32
variable stars with periods between 0.49 to 92 days.


title: Well-Structured Futures and Cache Locality

abstract:
  In fork-join parallelism, a sequential program is split into a directed
acyclic graph of tasks linked by directed dependency edges, and the tasks are
executed, possibly in parallel, in an order consistent with their dependencies.
A popular and effective way to extend fork-join parallelism is to allow threads
to create futures. A thread creates a future to hold the results of a
computation, which may or may not be executed in parallel. That result is
returned when some thread touches that future, blocking if necessary until the
result is ready.
  Recent research has shown that while futures can, of course, enhance
parallelism in a structured way, they can have a deleterious effect on cache
locality. In the worst case, futures can incur $\Omega(P T_\infty + t
T_\infty)$ deviations, which implies $\Omega(C P T_\infty + C t T_\infty)$
additional cache misses, where $C$ is the number of cache lines, $P$ is the
number of processors, $t$ is the number of touches, and $T_\infty$ is the
\emph{computation span}. Since cache locality has a large impact on software
performance on modern multicores, this result is troubling.
  In this paper, however, we show that if futures are used in a simple,
disciplined way, then the situation is much better: if each future is touched
only once, either by the thread that created it, or by a thread to which the
future has been passed from the thread that created it, then parallel
executions with work stealing can incur at most $O(C P T^2_\infty)$ additional
cache misses, a substantial improvement. This structured use of futures is
characteristic of many (but not all) parallel applications.


title: Critical Ising interfaces in multiply-connected domains

abstract:
  We prove a general result on convergence of interfaces in the critical planar
Ising model to conformally invariant curves absolutely continuous with respect
to SLE(3). Our setup includes multiple interfaces on arbitrary finitely
connected domains, and we also treat the radial SLE case. In the case of simply
and doubly connected domains, the limiting processes are described explicitly
in terms of rational and elliptic functions, respectively.


title:
Approximate solutions for mhd squeezing fluid flow by reproducing kernel
  Hilbert space method

abstract:
  In this paper, a steady axisymmetric MHD flow of two dimensional in-
compressible fluids has been investigated. Reproducing Kernel Hilbert Space
Method (RKHSM) is implemented to obtain solution of reduced fourth order
nonlinear boundary value problem. Numerical results have been compared with the
resutls that obtained by the Range-Kutta Method (RK-4) and Optimal Homotopy
Asymptotic Method (OHAM).


title:
Adaptive model predictive control with exploring property for
  constrained linear systems that uses basis function model parametrization

abstract:
  This manuscript contains technical details of recent results developed by the
authors on adaptive model predictive control for constrained linear systems
that exhibits exploring property and uses basis function model parametrization.


title:
Kinematic Morphology of Large-scale Structure: Evolution from Potential
  to Rotational Flow

abstract:
  As an alternative way of describing the cosmological velocity field, we
discuss the evolution of rotational invariants constructed from the velocity
gradient tensor. Compared with the traditional divergence-vorticity
decomposition, these invariants, defined as coefficients of characteristic
equation of the velocity gradient tensor, enable a complete classification of
all possible flow patterns in the dark-matter comoving frame, including both
potential and vortical flows. We show that this tool, first introduced in
turbulence two decades ago, proves to be very useful in understanding the
evolution of the cosmic web structure, and in classifying its morphology.
Before shell-crossing, different categories of potential flow are highly
associated with cosmic web structure, because of the coherent evolution of
density and velocity. This correspondence is even preserved at some level when
vorticity is generated after shell-crossing. The evolution from the potential
to vortical flow can be traced continuously by these invariants. With the help
of this tool, we show that the vorticity is generated in a particular way that
is highly correlated with the large-scale structure. This includes a distinct
spatial distribution and different types of alignment between cosmic web and
vorticity direction for various vortical flows. Incorporating shell-crossing
into closed dynamical systems is highly non-trivial, but we propose a possible
statistical explanation for some of these phenomena relating to the internal
structure of the three-dimensional invariants space.


title:
Application of Finite Strain Landau Theory To High Pressure Phase
  Transitions

abstract:
  In this paper we explain how to set up what is in fact the only possible
consistent construction scheme for a Landau theory of high pressure phase
transitions that systematically allows to take into account elastic
nonlinearities. We also show how to incorporate available information on the
pressure dependence of elastic constants taken from experiment or simulation.
We apply our new theory to the example of the high pressure cubic-tetragonal
phase transition in Strontium Titanate, a model perovskite that has played a
central role in the development of the theory of structural phase transitions.
Armed with pressure dependent elastic constants calculated by density
functional theory, we give a both qualitatively as well as quantitatively
satisfying description of recent high precision experimental data. Our
nonlinear theory also allows to predict a number of additional elastic
transition anomalies that are accessible to experiment.


title: Top quark Physics at the LHC

abstract:
  An overview of recent results on top quark properties and interactions is
given, obtained using data collected with the CMS and ATLAS experiments during
the years 2011 and 2012 at 7 TeV and 8 TeV centre-of-mass energies.
Measurements of top quark pair production cross sections in several top quark
final states are reported. Moreover, cross sections for the electroweak
production of single top quarks in both t- and tW-channels are shown. The mass
of the top quark is extracted using several methods. Presented results also
include measurements of the W helicity in top decays, the top pair charge
asymmetry, the top quark charge and the search for anomalous couplings.
Experimental outcomes are compared with standard model predictions and a
combination of measurements between the different LHC experiments is reported
when available.


title:
What is the difference? Blazhko and non-Blazhko RRab stars and the
  special case of V123 in M3

abstract:
  In an extended photometric campaign of RR Lyrae variables of the globular
cluster M3, an aberrant light-curve, non-Blazhko RRab star, V123, was detected.
Based on its brightness, colors and radial velocity curve, V123 is a bona fide
member of M3. The light curve of V123 exhibits neither a bump preceding light
minimum, nor a hump on the rising branch, and has a longer than normal rise
time, with a convex shape. Similar shape characterizes the mean light curves of
some large-modulation-amplitude Blazhko stars, but none of the regular RRab
variables with similar pulsation periods. This peculiar object thus mimics
Blazhko variables without showing any evidence of periodic amplitude and/or
phase modulation. We cannot find any fully convincing answer to the peculiar
behavior of V123, however, the phenomenon raises again the possibility that
rotation and aspect angle might play a role in the explanation of the Blazhko
phenomenon, and some source of inhomogeneity acts (magnetic field, chemical
inhomogeneity) that deforms the radial pulsation of Blazhko stars during the
modulation.


title: Single-valued periods and multiple zeta values

abstract:
  The values at 1 of single-valued multiple polylogarithms span a certain
subalgebra of multiple zeta values. In this paper, the properties of this
algebra are studied from the point of view of motivic periods.


title:
Conditioning of Random Block Subdictionaries with Applications to
  Block-Sparse Recovery and Regression

abstract:
  The linear model, in which a set of observations is assumed to be given by a
linear combination of columns of a matrix, has long been the mainstay of the
statistics and signal processing literature. One particular challenge for
inference under linear models is understanding the conditions on the dictionary
under which reliable inference is possible. This challenge has attracted
renewed attention in recent years since many modern inference problems deal
with the "underdetermined" setting, in which the number of observations is much
smaller than the number of columns in the dictionary. This paper makes several
contributions for this setting when the set of observations is given by a
linear combination of a small number of groups of columns of the dictionary,
termed the "block-sparse" case. First, it specifies conditions on the
dictionary under which most block subdictionaries are well conditioned. This
result is fundamentally different from prior work on block-sparse inference
because (i) it provides conditions that can be explicitly computed in
polynomial time, (ii) the given conditions translate into near-optimal scaling
of the number of columns of the block subdictionaries as a function of the
number of observations for a large class of dictionaries, and (iii) it suggests
that the spectral norm and the quadratic-mean block coherence of the dictionary
(rather than the worst-case coherences) fundamentally limit the scaling of
dimensions of the well-conditioned block subdictionaries. Second, this paper
investigates the problems of block-sparse recovery and block-sparse regression
in underdetermined settings. Near-optimal block-sparse recovery and regression
are possible for certain dictionaries as long as the dictionary satisfies
easily computable conditions and the coefficients describing the linear
combination of groups of columns can be modeled through a mild statistical
prior.


title:
Phenomenology of threshold corrections for inclusive jet production at
  hadron colliders

abstract:
  We study one-jet inclusive hadro-production and compute the QCD threshold
corrections for large transverse momentum of the jet in the soft-gluon
resummation formalism at next-to-leading logarithmic accuracy. We use the
resummed result to generate approximate QCD corrections at next-to-next-to
leading order, compare with results in the literature and present rapidity
integrated distributions of the jet's transverse momentum for Tevatron and LHC.
For the threshold approximation we investigate its kinematical range of
validity as well as its dependence on the jet's cone size and kinematics.


title:
Lattice polytopes, finite abelian subgroups in $\SL(n,\C)$ and coding
  theory

abstract:
  We consider $d$-dimensional lattice polytopes $\Delta$ with $h^*$-polynomial
$h^*_\Delta=1+h_k^*t^k$ for $1<k<(d+1)/2$ and relate them to some abelian
subgroups of $\SL_{d+1}(\C)$ of order $1+h_k^*=p^r$ where $p$ is a prime
number. These subgroups can be investigate by means of coding theory as special
linear constant weight codes in $\F_p^{d+1}$. If $p =2$, then the classication
of these codes and corresponding lattice polytopes can be obtained using a
theorem of Bonisoli. If $p > 2$, the main technical tool in the classification
of these linear codes is the non-vanishing theorem for generalized Bernoulli
numbers $B_{1,\chi}^{(r)}$ associated with odd characters $\chi:\F_q^*\to\C^*$
where $q=p^r$. Our result implies a complete classification of all lattice
polytopes whose $h^*$-polynomial is a binomial.


title:
Hitchin's conjecture for simply-laced Lie algebras implies that for any
  simple Lie algebra

abstract:
  Let $\g$ be any simple Lie algebra over $\mathbb{C}$. Recall that there
exists an embedding of $\mathfrak{sl}_2$ into $\g$, called a principal TDS,
passing through a principal nilpotent element of $\g$ and uniquely determined
up to conjugation. Moreover, $\wedge (\g^*)^\g$ is freely generated (in the
super-graded sense) by primitive elements $\omega_1, \dots, \omega_\ell$, where
$\ell$ is the rank of $\g$. N. Hitchin conjectured that for any primitive
element $\omega \in \wedge^d (\g^*)^\g$, there exists an irreducible
$\mathfrak{sl}_2$-submodule $V_\omega \subset \g$ of dimension $d$ such that
$\omega$ is non-zero on the line $\wedge^d (V_\omega)$. We prove that the
validity of this conjecture for simple simply-laced Lie algebras implies its
validity for any simple Lie algebra.
  Let G be a connected, simply-connected, simple, simply-laced algebraic group
and let $\sigma$ be a diagram automorphism of G with fixed subgroup K. Then, we
show that the restriction map R(G) \to R(K) is surjective, where R denotes the
representation ring over $\mathbb{Z}$. As a corollary, we show that the
restriction map in the singular cohomology H^*(G)\to H^*(K) is surjective. Our
proof of the reduction of Hitchin's conjecture to the simply-laced case relies
on this cohomological surjectivity.


title:
Conjugacy in Baumslag's group, generic case complexity, and division in
  power circuits

abstract:
  The conjugacy problem belongs to algorithmic group theory. It is the
following question: given two words x, y over generators of a fixed group G,
decide whether x and y are conjugated, i.e., whether there exists some z such
that zxz^{-1} = y in G. The conjugacy problem is more difficult than the word
problem, in general. We investigate the complexity of the conjugacy problem for
two prominent groups: the Baumslag-Solitar group BS(1,2) and the
Baumslag(-Gersten) group G(1,2). The conjugacy problem in BS(1,2) is
TC^0-complete. To the best of our knowledge BS(1,2) is the first natural
infinite non-commutative group where such a precise and low complexity is
shown. The Baumslag group G(1,2) is an HNN-extension of BS(1,2). We show that
the conjugacy problem is decidable (which has been known before); but our
results go far beyond decidability. In particular, we are able to show that
conjugacy in G(1,2) can be solved in polynomial time in a strongly generic
setting. This means that essentially for all inputs conjugacy in G(1,2) can be
decided efficiently. In contrast, we show that under a plausible assumption the
average case complexity of the same problem is non-elementary. Moreover, we
provide a lower bound for the conjugacy problem in G(1,2) by reducing the
division problem in power circuits to the conjugacy problem in G(1,2). The
complexity of the division problem in power circuits is an open and interesting
problem in integer arithmetic.


title:
Universal electric-field-driven resistive transition in narrow-gap Mott
  insulators

abstract:
  One of today's most exciting research frontier and challenge in condensed
matter physics is known as Mottronics, whose goal is to incorporate strong
correlation effects into the realm of electronics. In fact, taming the Mott
insulator-to-metal transition (IMT), which is driven by strong electronic
correlation effects, holds the promise of a commutation speed set by a quantum
transition, and with negligible power dissipation. In this context, one
possible route to control the Mott transition is to electrostatically dope the
systems using strong dielectrics, in FET-like devices. Another possibility is
through resistive switching, that is, to induce the insulator-to-metal
transition by strong electric pulsing. This action brings the correlated system
far from equilibrium, rendering the exact treatment of the problem a difficult
challenge. Here, we show that existing theoretical predictions of the
off-equilibrium manybody problem err by orders of magnitudes, when compared to
experiments that we performed on three prototypical narrow gap Mott systems
V2-xCrxO3, NiS2-xSex and GaTa4Se8, and which also demonstrate a striking
universality of this Mott resistive transition (MRT). We then introduce and
numerically study a model based on key theoretically known physical features of
the Mott phenomenon in the Hubbard model. We find that our model predictions
are in very good agreement with the observed universal MRT and with a
non-trivial timedelay electric pulsing experiment, which we also report. Our
study demonstrates that the MRT can be associated to a dynamically directed
avalanche.


title:
A modeling approach to design a software sensor and analyze agronomical
  features - Application to sap flow and grape quality relationship

abstract:
  This work proposes a framework using temporal data and domain knowledge in
order to analyze complex agronomical features. The expertise is first
formalized in an ontology, under the form of concepts and relationships between
them, and then used in conjunction with raw data and mathematical models to
design a software sensor. Next the software sensor outputs are put in relation
to product quality, assessed by quantitative measurements. This requires the
use of advanced data analysis methods, such as functional regression. The
methodology is applied to a case study involving an experimental design in
French vineyards. The temporal data consist of sap flow measurements, and the
goal is to explain fruit quality (sugar concentration and weight), using vine's
water courses through the various vine phenological stages. The results are
discussed, as well as the method genericity and robustness.


title: Contraction analysis of nonlinear random dynamical systems

abstract:
  In order to bring contraction analysis into the very fruitful and topical
fields of stochastic and Bayesian systems, we extend here the theory describes
in \cite{Lohmiller98} to random differential equations. We propose new
definitions of contraction (almost sure contraction and contraction in mean
square) which allow to master the evolution of a stochastic system in two
manners. The first one guarantees eventual exponential convergence of the
system for almost all draws, whereas the other guarantees the exponential
convergence in $L_2$ of to a unique trajectory. We then illustrate the relative
simplicity of this extension by analyzing usual deterministic properties in the
presence of noise. Specifically, we analyze stochastic gradient descent, impact
of noise on oscillators synchronization and extensions of combination
properties of contracting systems to the stochastic case. This is a first step
towards combining the interesting and simplifying properties of contracting
systems with the probabilistic approach.


title:
A prelie algebra associated to a linear endomorphism and related
  algebraic structures

abstract:
  We attach to any linear endomorphism f of any vector space V a structure of
prelie algebra on the shuffle algebra T(V); we describe its enveloping algebra,
the dual Hopf algebra and the associated group of characters. For f=Id\_V, we
find the algebra of formal diffeomorphisms, seen as a subalgebra of the
Connes-Kreimer Hopf algebra of rooted trees in the context of QFT; for other
well-chosen f, we obtain the groups of Fliess operators in Control Theory. An
algebraic structures of these Com-Prelie Hopf algebras is carried out:
gradations, group of automorphisms, subobject generated by V, etc.


title:
Recognizing Speech in a Novel Accent: The Motor Theory of Speech
  Perception Reframed

abstract:
  The motor theory of speech perception holds that we perceive the speech of
another in terms of a motor representation of that speech. However, when we
have learned to recognize a foreign accent, it seems plausible that recognition
of a word rarely involves reconstruction of the speech gestures of the speaker
rather than the listener. To better assess the motor theory and this
observation, we proceed in three stages. Part 1 places the motor theory of
speech perception in a larger framework based on our earlier models of the
adaptive formation of mirror neurons for grasping, and for viewing extensions
of that mirror system as part of a larger system for neuro-linguistic
processing, augmented by the present consideration of recognizing speech in a
novel accent. Part 2 then offers a novel computational model of how a listener
comes to understand the speech of someone speaking the listener's native
language with a foreign accent. The core tenet of the model is that the
listener uses hypotheses about the word the speaker is currently uttering to
update probabilities linking the sound produced by the speaker to phonemes in
the native language repertoire of the listener. This, on average, improves the
recognition of later words. This model is neutral regarding the nature of the
representations it uses (motor vs. auditory). It serve as a reference point for
the discussion in Part 3, which proposes a dual-stream neuro-linguistic
architecture to revisits claims for and against the motor theory of speech
perception and the relevance of mirror neurons, and extracts some implications
for the reframing of the motor theory.


title: Ground Energy of the Magnetic Laplacian in Polyhedral Bodies

abstract:
  The asymptotic behavior of the first eigenvalues of magnetic Laplacian
operators with large magnetic fields and Neumann realization in polyhedral
domains is characterized by a hierarchy of model problems. We investigate
properties of the model problems (continuity, semi-continuity, existence of
generalized eigenfunctions). We prove estimates for the remainders of our
asymptotic formula. Lower bounds are obtained with the help of a classical IMS
partition based on adequate coverings of the polyhedral domain, whereas upper
bounds are established by a novel construction of quasimodes, qualified as
sitting or sliding according to spectral properties of local model problems.


title: Unimodality of hitting times for stable processes

abstract:
  We show that the hitting times for points of real $\alpha-$stable L\'evy
processes ($1<\alpha\le 2$) are unimodal random variables. The argument relies
on strong unimodality and several recent multiplicative identities in law. In
the symmetric case we use a factorization of Yano et al., whereas in the
completely asymmetric case we apply an identity of the second author. The
method extends to the general case thanks to a fractional moment evaluation due
to Kuznetsov et al.


title:
Singular Bohr-Sommerfeld conditions for 1D Toeplitz operators:
  hyperbolic case

abstract:
  In this article, we state the Bohr-Sommerfeld conditions around a singular
value of hyperbolic type of the principal symbol of a self-adjoint
semiclassical Toeplitz operator on a compact connected K\"{a}hler surface.
These conditions allow the description of the spectrum of the operator in a
fixed size neighbourhood of the singularity. We provide numerical computations
for three examples, each associated to a different topology.


title: From Metadynamics to Dynamics

abstract:
  Metadynamics is a commonly used and successful enhanced sampling method. By
the introduction of a history dependent bias which depends on a restricted
number of collective variables(CVs) it can explore complex free energy surfaces
characterized by several metastable states separated by large free energy
barriers. Here we extend its scope by introducing a simple yet powerful method
for calculating the rates of transition between different metastable states.
The method does not rely on a previous knowledge of the transition states or
reaction co-ordinates, as long as CVs are known that can distinguish between
the various stable minima in free energy space. We demonstrate that our method
recovers the correct escape rates out of these stable states and also preserves
the correct sequence of state-to-state transitions, with minimal extra
computational effort needed over ordinary metadynamics. We apply the formalism
to three different problems and in each case find excellent agreement with the
results of long unbiased molecular dynamics runs.

categories: cond-mat.stat-mech cond-mat.mtrl-sci physics.chem-ph physics.comp-ph q-bio.BM


title: From Toda to KdV

abstract:
  For periodic Toda chains with a large number $N$ of particles we consider
states which are $N^{-2}$-close to the equilibrium and constructed by
discretizing arbitrary given $C^2-$functions with mesh size $N^{-1}.$ Our aim
is to describe the spectrum of the Jacobi matrices $L\_N$ appearing in the Lax
pair formulation of the dynamics of these states as $N \to \infty$. To this end
we construct two Hill operators $H\_\pm$ -- such operators come up in the Lax
pair formulation of the Korteweg-de Vries equation -- and prove by methods of
semiclassical analysis that the asymptotics as $N \rightarrow \infty $ of the
eigenvalues at the edges of the spectrum of $L\_N$ are of the form $\pm
(2-(2N)^{-2} \lambda ^\pm \_n + \cdots )$ where $(\lambda ^\pm \_n)\_{n \geq
0}$ are the eigenvalues of $H\_\pm $. In the bulk of the spectrum, the
eigenvalues are $o(N^{-2})$-close to the ones of the equilibrium matrix. As an
application we obtain asymptotics of a similar type of the discriminant,
associated to $L\_N$.


title: Drawbacks of the use of fidelity to assess quantum resources

abstract:
  Fidelity is a figure of merit widely employed in quantum technology in order
to quantify similarity between quantum states and, in turn, to assess quantum
resources or reconstruction techniques. Fidelities higher than, say, 0.9 or
0.99, are usually considered as a piece of evidence to say that two states are
very close in the Hilbert space. On the other hand, on the basis of several
examples for qubits and continuous variable systems, we show that such high
fidelities may be achieved by pairs of states with considerably different
physical properties, including separable and entangled states or classical and
nonclassical ones. We conclude that fidelity as a tool to assess quantum
resources should be employed with caution, possibly combined with additional
constraints restricting the pool of achievable states, or only as a mere
summary of a full tomographic reconstruction.


title: Low rank perturbations of large elliptic random matrices

abstract:
  We study the asymptotic behavior of outliers in the spectrum of bounded rank
perturbations of large random matrices. In particular, we consider
perturbations of elliptic random matrices which generalize both Wigner random
matrices and non-Hermitian random matrices with iid entries. As a consequence,
we recover the results of Capitaine, Donati-Martin, and F\'eral for perturbed
Wigner matrices as well as the results of Tao for perturbed random matrices
with iid entries. Along the way, we prove a number of interesting results
concerning elliptic random matrices whose entries have finite fourth moment;
these results include a bound on the least singular value and the asymptotic
behavior of the spectral radius.


title:
Prospects for Charged Current Deep-Inelastic Scattering off Polarized
  Nucleons at a Future Electron-Ion Collider

abstract:
  We present a detailed phenomenological study of charged-current-mediated
deep-inelastic scattering off longitudinally polarized nucleons at a future
Electron-Ion Collider. A new version of the event generator package DJANGOH,
extended by capabilities to handle processes with polarized nucleons, is
introduced and used to simulate charged current deep-inelastic scattering
including QED, QCD, and electroweak radiative effects. We carefully explore the
range of validity and the accuracy of the Jacquet-Blondel method to reconstruct
the relevant kinematic variables from the measured hadronic final state in
charged current events, assuming realistic detector performance parameters.
Finally, we estimate the impact of the simulated charged current single-spin
asymmetries on determinations of helicity parton distributions in the context
of a global QCD analysis at next-to-leading order accuracy.


title: Fluctuation theory for upwards skip-free L\'evy chains

abstract:
  A fluctuation theory and, in particular, a theory of scale functions is
developed for upwards skip-free L\'evy chains, i.e. for right-continuous random
walks embedded into continuous time as compound Poisson processes. This is done
by analogy to the spectrally negative class of L\'evy processes -- several
results, however, can be made more explicit/exhaustive in our compound Poisson
setting. In particular, the scale functions admit a linear recursion, of
constant order when the support of the jump measure is bounded, by means of
which they can be calculated -- some examples are considered.


title: Matroids with a modular 4-point line

abstract:
  A result of Seymour implies that any 3-connected matroid with a modular
3-point line is binary. We prove a similar characterization for 3-connected
matroids with modular 4-point lines. We show that such a matroid is either
representable over GF(3) or GF(4) or has an $F_7$-minor and either an
$(F_7^-)$- or $(F_7^-)^*$-minor.


title:
Efficient Continuous-Duty Bitter-Type Electromagnets for Cold Atom
  Experiments

abstract:
  We present the design, construction and characterization of Bitter-type
electromagnets which can generate high magnetic fields under continuous
operation with efficient heat removal for cold atom experiments. The
electromagnets are constructed from a stack of alternating layers consisting of
copper arcs and insulating polyester spacers. Efficient cooling of the copper
is achieved via parallel rectangular water cooling channels between copper
layers with low resistance to flow; a high ratio of the water-cooled surface
area to the volume of copper ensures a short length scale ~1 mm to extract
dissipated heat. High copper fraction per layer ensures high magnetic field
generated per unit energy dissipated. The ensemble is highly scalable and
compressed to create a watertight seal without epoxy. From our measurements, a
peak field of 770 G is generated 14 mm away from a single electromagnet with a
current of 400 A and a total power dissipation of 1.6 kW. With cooling water
flowing at 3.8 l/min, the coil temperature only increases by 7 degrees Celsius
under continuous operation.


title:
Surface-resistance measurements using superconducting stripline
  resonators

abstract:
  We present a method to measure the absolute surface resistance of conductive
samples at a set of GHz frequencies with superconducting lead stripline
resonators at temperatures 1- 6K. The stripline structure can easily be applied
for bulk samples and allows direct calculation of the surface resistance
without the requirement of additional calibration measurements or sample
reference points. We further describe a correction method to reduce
experimental background on high-Q resonance modes by exploiting TEM-properties
of the external cabling. We then show applications of this method to the
reference materials gold, tantalum, and tin, which include the anomalous skin
effect and conventional superconductivity. Furthermore, we extract the complex
optical conductivity for an all-lead stripline resonator to find a coherence
peak and the superconducting gap of lead.


title: Homothety Curvature Homogeneity

abstract:
  We examine the difference between several notions of curvature homogeneity
and show that the notions introduced by Kowalski and Van\v{z}urov\'a are
genuine generalizations of the ordinary notion of $k$-curvature homogeneity.
The homothety group plays an essential role in the analysis.


title:
Power Grid Simulation using Matrix Exponential Method with Rational
  Krylov Subspaces

abstract:
  One well adopted power grid simulation methodology is to factorize matrix
once and perform only backward forward substitution with a deliberately chosen
step size along the simulation. Since the required simulation time is usually
long for the power grid design, the costly factorization is amortized. However,
such fixed step size cannot exploit larger step size for the low frequency
response in the power grid to speedup the simulation. In this work, we utilize
the matrix exponential method with the rational Krylov subspace approximation
to enable adaptive step size in the power grid simulation. The kernel operation
in our method only demands one factorization and backward forward
substitutions. Moreover, the rational Krylov subspace approximation can relax
the stiffness constraint of the previous works. The cheap computation of
adaptivity in our method could exploit the long low frequency response in a
power grid and significantly accelerate the simulation. The experimental
results show that our method achieves up to 18X speedup over the trapezoidal
method with fixed step size.


title: Resistive Switching Assisted by Noise

abstract:
  We extend results by Stotland and Di Ventra on the phenomenon of resistive
switching aided by noise. We further the analysis of the mechanism underlying
the beneficial role of noise and study the EPIR (Electrical Pulse Induced
Resistance) ratio dependence with noise power. In the case of internal noise we
find an optimal range where the EPIR ratio is both maximized and independent of
the preceding resistive state. However, when external noise is considered no
beneficial effect is observed.


title: Landau Levels in Lattices with Long Range Hopping

abstract:
  In the presence of a periodic potential Landau levels (LLs) are broadened,
forming a barrier for accurate simulation of fractional quantum Hall effect
using cold atoms in optical lattices. Recently, it has been shown that the
degeneracy of the lowest Landau level (LLL) can be restored in a tight binding
lattice, if a particular form of long range hopping is introduced [E. Kapit and
E. J. Mueller, Phys. Rev. Lett. 105, 215303 (2010)]. In this paper, we
investigate three problems related to such quantum Hall parent Hamiltonians in
lattices. First, we show that there are infinitely many long range hopping
models in which a massively degenerate manifold is formed by lattice
discretizations of wavefunctions in the continuum LLL. We then give a general
method to construct such models, which is applicable to not only the LLL but
also higher LLs. We use this method to give an analytic expression for the
hoppings that restore the LLL, and an integral expression for the next LL. We
also consider whether the space spanned by discretized LL wavefunctions is as
large as the space spanned by continuum wavefunctions and find the constraints
on magnetic field for this condition to be satisfied. Finally, using these
constraints and first Chern numbers, we identify the bands of the Hofstadter
butterfly that correspond to continuum LLs.


title: Odd K_3,3 subdivisions in bipartite graphs

abstract:
  We prove that every internally 4-connected non-planar bipartite graph has an
odd K_3,3 subdivision; that is, a subgraph obtained from K_3,3 by replacing its
edges by internally disjoint odd paths with the same ends. The proof gives rise
to a polynomial-time algorithm to find such a subdivision. (A bipartite graph G
is internally 4-connected if it is 3-connected, has at least five vertices, and
there is no partition (A,B,C) of V(G) such that |A|,|B|>1, |C|=3 and G has no
edge with one end in A and the other in B.)


title:
Change Point Analysis of Histone Modifications Reveals Epigenetic Blocks
  Linking to Physical Domains

abstract:
  Histone modification is a vital epigenetic mechanism for transcriptional
control in eukaryotes. High-throughput techniques have enabled whole-genome
analysis of histone modifications in recent years. However, most studies assume
one combination of histone modification invariantly translates to one
transcriptional output regardless of local chromatin environment. In this study
we hypothesize that, the genome is organized into local domains that manifest
similar enrichment pattern of histone modification, which leads to orchestrated
regulation of expression of genes with relevant bio- logical functions. We
propose a multivariate Bayesian Change Point (BCP) model to segment the
Drosophila melanogaster genome into consecutive blocks on the basis of
combinatorial patterns of histone marks. By modeling the sparse distribution of
histone marks across the chromosome with a zero-inflated Gaussian mixture, our
partitions capture local BLOCKs that manifest relatively homogeneous enrichment
pattern of histone modifications. We further characterized BLOCKs by their
transcription levels, distribution of genes, degree of co-regulation and GO
enrichment. Our results demonstrate that these BLOCKs, although inferred merely
from histone modifications, reveal strong relevance with physical domains,
which suggest their important roles in chromatin organization and coordinated
gene regulation.


title: Non-perturbative quantum time evolution on the light-front

abstract:
  This paper introduces "time-dependent basis light-front quantization", which
is a covariant, nonperturbative, and first principles numerical approach to
time-dependent problems in quantum field theory. We demonstrate this approach
by evaluating photon emission from an electron in a strong, time and space
dependent external field. We study the acceleration of the electron in
combination with the evolution of the invariant mass of the electron-photon
system, in real time and at the amplitude level. Successive excitations of the
electron-photon system are evident.


title: Experimental Tests of Classical and Quantum Dimensions

abstract:
  We report on an experimental test of classical and quantum dimension. We have
used a dimension witness which can distinguish between quantum and classical
systems of dimension 2,3 and 4 and performed the experiment for all five cases.
The witness we have chosen is a base of semi-device independent cryptographic
and randomness expansion protocols. Therefore, the part of the experiment, in
which qubits were used, is a realization of these protocols. In our work we
also present an analytic method for finding the maximal quantum value of the
witness along with corresponding measurements and preparations. This method is
quite general and can be applied to any linear dimension witness.


title: Sorption Isotherms and Probability Theory of Complex Systems

abstract:
  We show that most of the empirical or semi-empirical isotherms proposed to
extend the Langmuir formula to sorption (adsorption, chimisorption and
biosorption) on heterogeneous surfaces in the gaseous and liquid phase belong
to the family and subfamily of the Burr_{XII} cumulative distribution
functions. As a consequence they obey relatively simple differential equations
which describe birth and death phenomena resulting from mesoscopic and
microscopic physicochemical processes. Using the probability theory, it is thus
possible to give a physical meaning to their empirical coefficients, to
calculate well defined quantities and to compare the results obtained from
different isotherms. Another interesting consequence of this finding is that it
is possible to relate the shape of the isotherm to the distribution of sorption
energies which we have calculated for each isotherm. In particular, we show
that the energy distribution corresponding to the Brouers-Sotolongo (BS)
isotherm [1] is the Gumbel extreme value distribution Finally we propose a
generalized GBS isotherm, calculate its relevant statistical properties and
recover all the previous results by giving well defined values to its
coefficients. In the course of the discussion we make contact with the Tsallis
nonextensive theory [2] and the noninteger order reaction and fractal kinetics
theory [3]. In the spirits of the present and previous publications, we propose
an alternative formula to include fractality in the Michealis-Menten enzyme
catalysis theory. Finally we suggest that the stochastic cluster model
introduced by K.Weron [4] to account for the universal character of relaxation
in disordered systems should be relevant for other phenomena in particular for
heterogeneous sorption


title:
Magnetic induction measurements using an all-optical $^{87}$Rb atomic
  magnetometer

abstract:
  In this work we propose, and experimentally demonstrate, the use of a
self-oscillating all-optical atomic magnetometer for magnetic induction
measurements. Given the potential for miniaturization of atomic magnetometers,
and their extreme sensitivity, the present work shows that atomic magnetometers
may play a key role in the development of instrumentation for magnetic
induction tomography.


title: Fano varieties with small non-klt locus

abstract:
  Let X be a Fano variety of index k such that the non-klt locus Nklt(X) is not
empty. We prove that Nklt(X) has dimension at least k-1 and equality holds if
and only if Nklt(X) is a linear projective space P^{k-1}. In this case X has lc
singularities and is a generalised cone with Nklt(X) as vertex. If X has lc
singularities and Nklt(X) has dimension k we describe the non-klt locus and the
global geometry of X. Moreover, we construct examples to show that all the
classification results are effective.


title: Using Cosmology to Establish the Quantization of Gravity

abstract:
  While many aspects of general relativity have been tested, and general
principles of quantum dynamics demand its quantization, there is no direct
evidence for that. It has been argued that development of detectors sensitive
to individual gravitons is unlikely, and perhaps impossible. We argue here,
however, that measurement of polarization of the Cosmic Microwave Background
due to a long wavelength stochastic background of gravitational waves from
Inflation in the Early Universe would firmly establish the quantization of
gravity.


title: A Comparative Usability Study of Two-Factor Authentication

abstract:
  Two-factor authentication (2F) aims to enhance resilience of password-based
authentication by requiring users to provide an additional authentication
factor, e.g., a code generated by a security token. However, it also introduces
non-negligible costs for service providers and requires users to carry out
additional actions during the authentication process. In this paper, we present
an exploratory comparative study of the usability of 2F technologies. First, we
conduct a pre-study interview to identify popular technologies as well as
contexts and motivations in which they are used. We then present the results of
a quantitative study based on a survey completed by 219 Mechanical Turk users,
aiming to measure the usability of three popular 2F solutions: codes generated
by security tokens, one-time PINs received via email or SMS, and dedicated
smartphone apps (e.g., Google Authenticator). We record contexts and
motivations, and study their impact on perceived usability. We find that 2F
technologies are overall perceived as usable, regardless of motivation and/or
context of use. We also present an exploratory factor analysis, highlighting
that three metrics -- ease-of-use, required cognitive efforts, and
trustworthiness -- are enough to capture key factors affecting 2F usability.


title:
Relativistic wave equations of n-body systems of fermions and
  antifermions of various masses in quantum electrodynamics

abstract:
  The variational method in a reformulated Hamiltonian formalism of Quantum
Electrodynamics is used to derive relativistic wave equations for systems
consisting of n fermions and antifermions of various masses. The derived
interaction kernels of these equations include one-photon exchange
interactions. The equations have the expected Schroedinger non-relativistic
limit. Application to some exotic few lepton systems is discussed briefly.


title:
Limit cycles for a class of quintic $\mathbb{Z}_6-$equivariant systems
  without infinite critical points

abstract:
  We analyze the dynamics of a 4-parameter family of planar ordinary
differential equations, given by a polynomial of degree 5 that is equivariant
under a symmetry of order 6. We obtain the number of limit cycles as a function
of the parameters, and provide criteria for proving in some cases uniqueness
and hyperbolicity of the limit cycle surrounding either 1, 7 or 13 critical
points, the origin being always one of these points. The method used is the
reduction of the problem to an Abel equation.


title:
Exponential Decay and Fermi's Golden Rule from an Uncontrolled Quantum
  Zeno Effect

abstract:
  We modify the theory of the Quantum Zeno Effect to make it consistent with
the postulates of quantum mechanics. This modification allows one, throughout a
sequence of observations of an excited system, to address the nature of the
observable and thereby to distinguish survival from non-decay, which is
necessary whenever excited states are degenerate. As a consequence, one can
determine which types of measurements can possibly inhibit the exponential
decay of the system. We find that continuous monitoring taken as the limit of a
sequence of ideal measurements will only inhibit decay in special cases, such
as in well-controlled experiments. Uncontrolled monitoring of an unstable
system, however, can cause exponentially decreasing non-decay probability at
all times. Furthermore, calculating the decay rate for a general sequence of
observations leads to a straightforward derivation of Fermi's Golden Rule, that
avoids many of the conceptual difficulties normally encountered. When multiple
decay channels are available, the derivation reveals how the total decay rate
naturally partitions into a sum of the decay rates for the various channels, in
agreement with observations. Continuous and unavoidable monitoring of an
excited system by an uncontrolled environment may therefore be a mechanism by
which to explain the exponential decay law.


title: Generic circuits sets and general initial ideals with respect to weights

abstract:
  We study the set of circuits of a homogeneous ideal and that of its
truncations, and introduce the notion of generic circuits set. We show how this
is a well-defined invariant that can be used, in the case of initial ideals
with respect to weights, as a counterpart of the (usual) generic initial ideal
with respect to monomial orders. As an application we recover the existence of
the generic fan introduced by R\"omer and Schmitz for studying generic tropical
varieties. We also consider general initial ideals with respect to weights and
show, in analogy to the fact that generic initial ideals are Borel-fixed, that
these are fixed under the action of certain Borel subgroups of the general
linear group.


title: The double-power approach to spherically symmetric astrophysical systems

abstract:
  In this paper, we present two simple approaches for deriving anisotropic
distribution functions for a wide range of spherical models. The first method
involves multiplying and dividing a basic augmented density with polynomials in
$r$ and constructing more complex augmented densities in the process, from
which we obtain the double-power distribution functions. This procedure is
applied to a specific case of the Veltmann models that is known to closely
approximate the Navarro-Frenk-White (NFW) profile, and also to the Plummer and
Hernquist profiles (in the appendix). The second part of the paper is concerned
with obtaining hypervirial distribution functions, i.e. distribution functions
that satisfy the local virial theorem, for several well-known models. In order
to construct the hypervirial augmented densities and the corresponding
distribution functions, we start with an appropriate ansatz for the former and
proceed to determine the coefficients appearing in that ansatz by expanding the
potential--density pair as a series, around $r=0$ and $r=\infty$. By doing so,
we obtain hypervirial distribution functions, valid in these two limits, that
can generate the potential--density pairs of these models to an arbitrarily
high degree of accuracy. This procedure is explicitly carried out for the
H\'enon isochrone, Jaffe, Dehnen and NFW models and the accuracy of this
procedure is established. Finally, we derive some universal properties for
these hypervirial distribution functions, involving the asymptotic behaviour of
the anisotropy parameter and its relation to the density slope in this regime.
In particular, we show that the cusp slope--central anisotropy inequality is
saturated.


title:
Long-range Scanning Tunneling Microscope for the study of nanostructures
  on insulating substrates

abstract:
  The Scanning Tunneling Microscope is a powerful tool for studying the
electronic properties at the atomic level, however it's relatively small
scanning range and the fact that it can only operate on conducting samples
prevents its application to study heterogeneous samples consisting on
conducting and insulating regions. Here we present a long-range scanning
tunneling microscope capable of detecting conducting micro and nanostructures
on insulating substrates using a technique based on the capacitance between the
tip and the sample and performing STM studies.


title: Human Resource Management System

abstract:
  The paper titled HUMAN RESOURCE MANAGEMENT SYSTEM is basically concerned with
managing the Administrator of HUMAN RESOURCE Department in a company. A Human
Resource Management System, refers to the systems and processes at the
intersection between human resource management and information technology. It
merges HRM as a discipline and in particular its basic HR activities and
processes with the information technology field, whereas the programming of
data processing systems evolved into standardized routines and packages of
enterprise resource planning software. The main objective of this paper is to
reduce the effort of Administrator to keep the daily events such as attendance,
projects, works, appointments, etc. This paper deals with the process of
identifying the employees, recording their attendance hourly and calculating
their effective payable hours or days. This paper should maintain the records
of each and every employee and their time spend in to company, which can be
used for performance appraisal. Based on that transfer, removal, promotion can
be done.


title: Sequential Selection Procedures and False Discovery Rate Control

abstract:
  We consider a multiple hypothesis testing setting where the hypotheses are
ordered and one is only permitted to reject an initial contiguous block,
H_1,\dots,H_k, of hypotheses. A rejection rule in this setting amounts to a
procedure for choosing the stopping point k. This setting is inspired by the
sequential nature of many model selection problems, where choosing a stopping
point or a model is equivalent to rejecting all hypotheses up to that point and
none thereafter. We propose two new testing procedures, and prove that they
control the false discovery rate in the ordered testing setting. We also show
how the methods can be applied to model selection using recent results on
p-values in sequential model selection settings.


title:
Wetting in a two-dimensional capped capillary. Part I: Wetting
  temperature and capillary prewetting

abstract:
  In this two-part study we investigate the phase behaviour of a fluid
spatially confined in a semi-infinite rectangular pore formed by three
orthogonal walls and connected to a reservoir maintaining constant values of
pressure and temperature in the fluid. Far from the capping wall this
prototypical two-dimensional system reduces to a one-dimensional slit pore.
However, the broken translational symmetry leads to a wetting behavior
strikingly different from that of a slit pore. Using a realistic model of an
atomic fluid with long-ranged Lennard-Jones fluid-fluid and fluid-substrate
interactions, we present for the first time detailed computations of full phase
diagrams of two-dimensional capped capillaries. Our analysis is based on the
statistical mechanics of fluids, in particular density functional theory. We
show the existence of capillary wetting temperature, which is a property of the
pore, and relatively to the fluid temperature determines whether capillary
condensation is a first-order or a continuous phase transition. We also report
for the first time a first-order capillary wetting transition, which can be
preceded by a first-order capillary prewetting. A full parametric study is
undertaken and we support our findings with exhaustive examples of density
profiles, adsorption and free energy isotherms, as well as full phase diagrams.


title:
Families of hyperfinite subfactors with the same standard invariant and
  prescribed fundamental group

abstract:
  We construct irreducible hyperfinite subfactors of index 6 with a prescribed
fundamental group from a large family containing all countable and many
uncountable subgroups of R_+. We also prove that there are unclassifiably many
irreducible hyperfinite group-type subfactors of index 6 that all have the same
standard invariant. More precisely, we associate such a subfactor to every
ergodic measure preserving automorphism of the interval [0,1] and prove that
the resulting subfactors are isomorphic if and only if the automorphisms are
conjugate.


title:
Wetting in a two-dimensional capped capillary. Part II: Three-phase
  coexistence

abstract:
  In Part II of this study we consider two cases of three-phase coexistence.
First, the capped capillary may allow for vapour, drop-like, and slab-like
phases to coexist at the same values of temperature and chemical potential.
Second, the slit pore forming the bulk of the capped capillary may allow for
the coexistence between vapour, planar prewetting film and capillary-liquid.
While the consideration of the former case allows us to summarise the
phenomenology presented in Part I and to show that the transition line of wedge
prewetting is shifted in capillary-like geometries by a constant value,
depending on the capillary width, the careful examination of the latter case
allows us to uncover a new phase transition in confined fluids, a continuous
planar prewetting transition. A planar prewetting transition is known to be a
distinctly first-order phenomenon, and typically taking place on the scale of
several atomic diameters. A continuous prewetting transition, on the other
hand, is scale invariant. Thus, apart from being of fundamental significance,
this finding has potential for facilitating experimental detection as well as
measurements of planar prewetting. Further, we provide proof for the existence
of a tri-critical point of the three-phase coexistence line of the capped
capillary while by considering a dynamic model of wetting we show how the
relaxation of the system can be pinned by a metastable state. We present a full
parametric study of our model system and support our findings with exhaustive
examples of density profiles, adsorption and free energy isotherms, and full
phase diagrams.


title: A theory of explicit finite-difference schemes

abstract:
  Conventional finite-difference schemes for solving partial differential
equations are based on approximating derivatives by finite-differences. In this
work, an alternative theory is proposed which view finite-difference schemes as
systematic ways of matching up to the operator solution of the partial
differential equation. By completely abandon the idea of approximating
derivatives directly, the theory provides a unified description of explicit
finite-difference schemes for solving a general linear partial differential
equation with constant coefficients to any time-marching order. As a result,
the stability of the first-order algorithm for an entire class of linear
equations can be determined all at once. Because the method is based on
solution-matching, it can also be used to derive any order schemes for solving
the general nonlinear advection equation.


title:
Development of Comprehensive Devnagari Numeral and Character Database
  for Offline Handwritten Character Recognition

abstract:
  In handwritten character recognition, benchmark database plays an important
role in evaluating the performance of various algorithms and the results
obtained by various researchers. In Devnagari script, there is lack of such
official benchmark. This paper focuses on the generation of offline benchmark
database for Devnagari handwritten numerals and characters. The present work
generated 5137 and 20305 isolated samples for numeral and character database,
respectively, from 750 writers of all ages, sex, education, and profession. The
offline sample images are stored in TIFF image format as it occupies less
memory. Also, the data is presented in binary level so that memory requirement
is further reduced. It will facilitate research on handwriting recognition of
Devnagari script through free access to the researchers.


title: The Circuit Quantum Electrodynamical Josephson Interferometer

abstract:
  Arrays of circuit cavities offer fascinating perspectives for exploring
quantum many-body systems in a driven dissipative regime where excitation
losses are continuously compensated by coherent input drives. Here we
investigate a system consisting of three transmission line resonators, where
the two outer ones are driven by coherent input sources and the central
resonator interacts with a superconducting qubit. Whereas a low excitation
number regime of such a device has been considered previously with a numerical
integration, we here specifically address the high excitation density regime.
We present analytical approximations to these regimes in the form of two
methods. The first method is a Bogoliubov or linear expansion in quantum
fluctuations which can be understood as an approximation for weak
nonlinearities. As the second method we introduce a combination of mean-field
decoupling for the photon tunneling with an exact approach to a driven Kerr
nonlinearity which can be understood as an approximation for low tunneling
rates. In contrast to the low excitation regime we find that for high
excitation numbers the anti-bunching of output photons from the central cavity
does not monotonously disappear as the tunnel coupling between the resonators
is increased.


title: Spontaneous Emission from a Two-Level Atom in a Rectangular Waveguide

abstract:
  Quantum mechanical treatment of light inside dielectric media is important to
understand the behavior of an optical system. In this paper, a two-level atom
embedded in a rectangular waveguide surrounded by a perfect electric conductor
is considered. Spontaneous emission, propagation, and detection of a photon are
described by the second quantization formalism. The quantized modes for light
are divided into two types: photonic propagating modes and localized modes with
exponential decay along the direction of waveguide. Though spontaneous emission
depends on all possible modes including the localized modes, detection far from
the source only depends on the propagating modes. This discrepancy of dynamical
behaviors gives two different decay rates along space and time in the
correlation function of the photon detection.


title:
An inverse problem for the differential operator on the graph with a
  cycle with different orders on different edges

abstract:
  We consider a variable order differential operator on a graph with a cycle.
We study the inverse spectral problem for this operator by the system of
spectra. The main results of the paper are the uniqueness theorem and the
constructive procedure for the solution of the inverse problem.


title: The smooth cyclotron line in Her X-1 as seen with NuSTAR

abstract:
  Her X-1, one of the brightest and best studied X-ray binaries, shows a
cyclotron resonant scattering feature (CRSF) near 37 keV. This makes it an
ideal target for detailed study with the Nuclear Spectroscopic Telescope Array
(NuSTAR), taking advantage of its excellent hard X-ray spectral resolution. We
observed Her X-1 three times, coordinated with Suzaku, during one of the high
flux intervals of its 35d super-orbital period. This paper focuses on the shape
and evolution of the hard X-ray spectrum. The broad-band spectra can be fitted
with a powerlaw with a high-energy cutoff, an iron line, and a CRSF. We find
that the CRSF has a very smooth and symmetric shape, in all observations and at
all pulse-phases. We compare the residuals of a line with a Gaussian optical
depth profile to a Lorentzian optical depth profile and find no significant
differences, strongly constraining the very smooth shape of the line. Even
though the line energy changes dramatically with pulse phase, we find that its
smooth shape does not. Additionally, our data show that the continuum is only
changing marginally between the three observations. These changes can be
explained with varying amounts of Thomson scattering in the hot corona of the
accretion disk. The average, luminosity-corrected CRSF energy is lower than in
past observations and follows a secular decline. The excellent data quality of
NuSTAR provides the best constraint on the CRSF energy to date.


title: The role of neighbours selection on cohesion and order of swarms

abstract:
  We introduce a multi-agent model for exploring how selection of neighbours
determines some aspects of order and cohesion in swarms. The model algorithm
states that every agents' motion seeks for an optimal distance from the nearest
topological neighbour encompassed in a limited attention field. Despite the
great simplicity of the implementation, varying the amplitude of the attention
landscape, swarms pass from cohesive and regular structures towards fragmented
and irregular configurations. Interestingly, this movement rule is an ideal
candidate for implementing the selfish herd hypothesis which explains
aggregation of alarmed group of social animals.


title: Dynamical Measurements of the Interior Structure of Exoplanets

abstract:
  Giant gaseous planets often reside on orbits in sufficient proximity to their
host stars for the planetary quadrupole gravitational field to become
non-negligible. In presence of an additional planetary companion, a precise
characterization of the system's orbital state can yield meaningful constraints
on the transiting planet's interior structure. However, such methods can
require a very specific type of system. This paper explores the dynamic range
of applicability of these methods and shows that interior structure
calculations are possible for a wide array of orbital architectures. The
HAT-P-13 system is used as a case study, and the implications of perturbations
arising from a third distant companion on the feasibility of an interior
calculation are discussed. We find that the method discussed here is likely to
be useful in studying other planetary systems, allowing the possibility of an
expanded survey of the interiors of exoplanets.


title:
Broad Absorption Line Variability on Multi-Year Timescales in a Large
  Quasar Sample

abstract:
  We present a detailed investigation of the variability of 428 C IV and 235 Si
IV Broad Absorption Line (BAL) troughs identified in multi-epoch observations
of 291 quasars by the Sloan Digital Sky Survey-I/II/III. These observations
primarily sample rest-frame timescales of 1-3 yr over which significant
rearrangement of the BAL wind is expected. We derive a number of observational
results on, e.g., the frequency of BAL variability, the velocity range over
which BAL variability occurs, the primary observed form of BAL-trough
variability, the dependence of BAL variability upon timescale, the frequency of
BAL strengthening vs. weakening, correlations between BAL variability and
BAL-trough profiles, relations between C IV and Si IV BAL variability,
coordinated multi-trough variability, and BAL variations as a function of
quasar properties. We assess implications of these observational results for
quasar winds. Our results support models where most BAL absorption is formed
within an order-of-magnitude of the wind-launching radius, although a
significant minority of BAL troughs may arise on larger scales. We estimate an
average lifetime for a BAL trough along our line-of-sight of a few thousand
years. BAL disappearance and emergence events appear to be extremes of general
BAL variability, rather than being qualitatively distinct phenomena. We derive
the parameters of a random-walk model for BAL EW variability, finding that this
model can acceptably describe some key aspects of EW variability. The
coordinated trough variability of BAL quasars with multiple troughs suggests
that changes in "shielding gas" may play a significant role in driving general
BAL variability.


title: Mixed axion/neutralino dark matter in the SUSY DFSZ axion model

abstract:
  We examine mixed axion/neutralino cold dark matter production in the SUSY
DFSZ axion model where an axion superfield couples to Higgs superfields. We
calculate a wide array of axino and saxion decay modes along with their decay
temperatures, and thermal and non-thermal production rates. For a SUSY
benchmark model with a standard underabundance (SUA) of Higgsino-like dark
matter (DM), we find for the PQ scale f_a< 10^{12} GeV that the DM abundance is
mainly comprised of axions as the saxion/axino decay occurs before the standard
neutralino freeze-out and thus its abundance remains suppressed. For 10^{12}<~
f_a<~ 10^{14} GeV, the saxion/axino decays occur after neutralino freeze-out so
that the neutralino abundance is enhanced by the production via decay and
subsequent re-annihilation. For f_a>~ 10^{14} GeV, both neutralino dark matter
and dark radiation are typically overproduced. For judicious parameter choices,
these can be suppressed and the combined neutralino/axion abundance brought
into accord with measured values. A SUSY benchmark model with a standard
overabundance (SOA) of bino DM is also examined and typically remains excluded
due at least to too great a neutralino DM abundance for f_a<~ 10^{15} GeV. For
f_a>~ 10^{15} GeV and lower saxion masses, large entropy production from saxion
decay can dilute all relics and the SOA model can be allowed by all
constraints.


title:
Relativistic jets in narrow-line Seyfert 1 galaxies. New discoveries and
  open questions

abstract:
  Before the launch of the Fermi satellite only two classes of AGNs were known
to produce relativistic jets and thus emit up to the gamma-ray energy range:
blazars and radio galaxies, both hosted in giant elliptical galaxies. The first
four years of observations by the Large Area Telescope on board Fermi confirmed
that these two are the most numerous classes of identified sources in the
extragalactic gamma-ray sky, but the discovery of gamma-ray emission from 5
radio-loud narrow-line Seyfert 1 galaxies revealed the presence of a possible
emerging third class of AGNs with relativistic jets. Considering that
narrow-line Seyfert 1 galaxies seem to be typically hosted in spiral galaxy,
this finding poses intriguing questions about the nature of these objects, the
onset of production of relativistic jets, and the cosmological evolution of
radio-loud AGN. Here, we discuss the radio-to-gamma-rays properties of the
gamma-ray emitting narrow-line Seyfert 1 galaxies, also in comparison with the
blazar scenario.


title:
Comment on "Nature of the Epidemic Threshold for the
  Susceptible-Infected-Susceptible Dynamics in Networks" [arXiv:1305.4819]

abstract:
  Recently, Bogu\~{n}\'{a} {\it et. al.} [Phys. Rev. Lett. {\bf 111}, 068701
(2013), arXiv:1305.4819] claimed that the epidemic threshold of the
susceptible-infected-susceptible (SIS) model is zero on random scale-free (SF)
networks with the small-world (SW) property. They drew the conclusion by taking
into account a long-range reinfection mechanism. In this Comment, we will show
that such an effect is too weak to guarantee an endemic phase with a {\em
finite} fraction of infected nodes. Consequently, the epidemic threshold can be
finite in random SF networks.


title: Intrinsic brightness temperatures of blazar jets at 15 GHz

abstract:
  We have developed a new Bayesian Markov Chain Monte Carlo method to
deconvolve light curves of blazars into individual flares, including proper
estimation of the fit errors. We use the method to fit 15\,GHz light curves
obtained within the OVRO 40-m blazar monitoring program where a large number of
AGN have been monitored since 2008 in support of the Fermi Gamma-Ray Space
Telescope mission. The time scales obtained from the fitted models are used to
calculate the variability brightness temperature of the sources. Additionally,
we have calculated brightness temperatures of a sample of these objects using
Very Long Baseline Array data from the MOJAVE survey. Combining these two data
sets enables us to study the intrinsic brightness temperature distribution in
these blazars at 15 GHz. Our preliminary results indicate that the mean
intrinsic brightness temperature in a sample of 14 sources is near the
equipartition brightness temperature of $\sim 10^{11}$K.


title:
Self-similar solutions for active scalar equations in
  Fourier-Besov-Morrey spaces

abstract:
  We are concerned with a family of dissipative active scalar equation with
velocity fields coupled via multiplier operators that can be of high-order. We
consider sub-critical values for the fractional diffusion and prove global
well-posedness of solutions with small initial data belonging to a framework
based on Fourier transform, namely Fourier-Besov-Morrey spaces. Since the
smallness condition is with respect to the weak norm of this space, some
initial data with large $L^{2}$-norm can be considered. Self-similar solutions
are obtained depending on the homogeneity of the initial data and couplings.
Also, we show that solutions are asymptotically self-similar at infinity. Our
results can be applied in a unified way for a number of active scalar PDEs like
1D models on dislocation dynamics in crystals, Burguer's equations, 2D
vorticity equation, 2D generalized SQG, 3D magneto geostrophic equations, among
others.


title:
A Significantly Low CO Abundance Toward the TW Hya Protoplanetary Disk:
  A Path to Active Carbon Chemistry?

abstract:
  In this Letter we report the CO abundance relative to H2 derived toward the
circumstellar disk of the T-Tauri star TW Hya from the HD (1-0) and C18O (2-1)
emission lines. The HD (1-0) line was observed by the Herschel Space
Observatory Photodetector Array Camera and Spectrometer whereas C18O (2-1)
observations were carried out with the Submillimeter Array at a spatial
resolution of 2.8" x 1.9" (corresponding to 142 x 97 AU). In the disk's warm
molecular layer (T>20 K) we measure a disk-averaged gas-phase CO abundance
relative to H2 of $\chi{\rm(CO)}=(0.1-3)x10^{-5}$, substantially lower than the
canonical value of $\chi{\rm(CO)}=10^{-4}$. We infer that the best explanation
of this low $\chi$(CO) is the chemical destruction of CO followed by rapid
formation of carbon chains, or perhaps CO2, that can subsequently freeze-out,
resulting in the bulk mass of carbon locked up in ice grain mantles and oxygen
in water. As a consequence of this likely time-dependent carbon sink mechanism,
CO may be an unreliable tracer of H2 gas mass.


title:
Bayesian reweighting of nuclear PDFs and constraints from proton-lead
  collisions at the LHC

abstract:
  New hard-scattering measurements from the LHC proton-lead run have the
potential to provide important constraints on the nuclear parton distributions
and thus contributing to a better understanding of the initial state in heavy
ion collisions. In order to quantify these constraints, as well as to assess
the compatibility with available nuclear data from fixed target experiments and
from RHIC, the traditional strategy is to perform a global fit of nuclear PDFs.
This procedure is however time consuming and technically challenging, and
moreover can only be performed by the PDF fitters themselves. In the case of
proton PDFs, an alternative approach has been suggested that uses Bayesian
inference to propagate the effects of new data into the PDFs without the need
of refitting. In this work, we apply this reweighting procedure to study the
impact on nuclear PDFs of low-mass Drell-Yan and single-inclusive
hadroproduction pseudo-data from proton-lead collisions at the LHC as
representative examples. In the hadroproduction case, in addition we assess the
possibility of discriminating between the DGLAP and CGC production frameworks.
We find that the LHC proton-lead data could lead to a substantial reduction of
the uncertainties on nuclear PDFs, in particular for the small-x gluon PDF
where uncertainties could decrease by up to a factor two. The Monte Carlo
replicas of EPS09 used in the analysis are released as a public code for
general use. It can be directly used, in particular, by the experimental
collaborations to check, in a straightforward manner, the degree of
compatibility of the new data with the global nPDF analyses.


title: Extensible Generic Data Management Software

abstract:
  Extensibility mechanisms constitute a form of knowledge capture that is
essential for software re-use. The Data Intensive Cyber Environments (DICE)
group has collaborated with twenty-five science and engineering domains on the
application of the iRODS policy-based data management system. Based on these
collaborations, three types of extensibility mechanisms are sufficient to
capture the domain knowledge needed for interaction with domain resources:
computer actionable rules that control management policies; computer executable
micro-services that encapsulate operations or interaction protocols; and
middleware servers that apply standard operations at remote locations. These
mechanisms enable the creation of generic data management software that is
capable of implementing collections, data grids for sharing data, digital
libraries for publishing data, processing pipelines, and archives.