title:
Magnetostrictive Fe73Ga27 nanocontacts for low field conductance
  switching

abstract:
  The electrical conductance G of magnetostrictive nanocontacts made from
Galfenol Fe73Ga27 can be reproducibly switched between on and off states in a
low magnetic field of 20 to 30 mT at 10 K. The switching behavior is in
agreement with the magnetic field dependence of the magnetostriction inferred
from the magnetization behavior, causing a positive magnetostrictive strain
along the magnetic field. The repeated magneticfield cycling leads to a stable
contact geometry and to a robust contact configuration with a very low
hysteresis of 1 mT between opening and closing the contact due to a training
effect. Nonintegral multiples of the conductance quantum G0 observed for G is
greater than G0 are attributed to electron backscattering at defect sites in
the electrodes near the contact interface. When the contact is closed either
mechanically or by magnetic field, the conductance shows an exponential
behavior below G0 due to electron tunneling. This allows to estimate the
magnetostriction at 10 K. The results demonstrate that such magnetostrictive
devices are suitable for the remote control of the conductance by low magnetic
fields in future nanotechnology applications.


title: The unicity of types for depth-zero supercuspidal representations

abstract:
  We establish the unicity of types for depth-zero supercuspidal
representations of an arbitrary $p$-adic group $G$, showing that each
depth-zero supercuspidal representation of $G$ contains a unique conjugacy
class of typical representations of maximal compact subgroups of $G$. As a
corollary, we obtain an inertial Langlands correspondence for these
representations, via the Langlands correspondence of DeBacker and Reeder.


title:
Intensity asymmetries in the dusk sector of the poleward auroral oval
  due to IMF $\mathit{B}_{x}$

abstract:
  In the exploration of global-scale features of the Earth's aurora, little
attention has been given to the radial component of the Interplanetary Magnetic
Field (IMF). This study investigates the global auroral response in both
hemispheres when the IMF is southward and lies in the $\textit{xz}$ plane. We
present a statistical study of the average auroral response in the 12-24
magnetic local time (MLT) sector to an $\textit{x}$ component in the IMF. Maps
of auroral intensity in both hemispheres for two IMF $\mathit{B}_{x}$ dominated
conditions($ \pm $ IMF $\mathit{B}_{x}$) are shown during periods of negative
IMF $\mathit{B}_{z}$, small IMF $\mathit{B}_{y}$, and local winter. This is
obtained by using global imaging from the Wideband Imaging Camera on the IMAGE
satellite. The analysis indicates a significant asymmetry between the two IMF
$\mathit{B}_{x}$ dominated conditions in both hemispheres. In the Northern
Hemisphere the aurora is brighter in the 15-19 MLT region during negative IMF
$\mathit{B}_{x}$. In the Southern Hemisphere the aurora is brighter in the
16-20 MLT sector during positive IMF $\mathit{B}_{x}$. We interpret the results
in the context of a more efficient solar wind dynamo in one hemisphere. Both
the intensity asymmetry and its location are consistent with this idea. This
has earlier been suggested from case studies of simultaneous observations of
the aurora in both hemispheres, but hitherto never been observed to have a
general impact on global auroral brightness in both hemispheres from a
statistical study. The observed asymmetries between the two IMF
$\mathit{B}_{x}$ cases are not large; however, the difference is significant
with a 95% confidence level. As the solar wind conditions examined in the study
are rather common (37% of the time) the accumulative effect of this small
influence may be important for the total energy budget.


title: Polyhedra with few 3-cuts are hamiltonian

abstract:
  In 1956, Tutte showed that every planar 4-connected graph is hamiltonian. In
this article, we will generalize this result and prove that polyhedra with at
most three 3-cuts are hamiltonian. In 2002 Jackson and Yu have shown this
result for the subclass of triangulations. We also prove that polyhedra with at
most four 3-cuts have a hamiltonian path. It is well known that for each $k \ge
6$ non-hamiltonian polyhedra with $k$ 3-cuts exist. We give computational
results on lower bounds on the order of a possible non-hamiltonian polyhedron
for the remaining open cases of polyhedra with four or five 3-cuts.


title:
Magnetocaloric effect and nature of magnetic transition in low
  dimensional DyCu2

abstract:
  In this manuscript, we propose a method to prepare small flakes of DyCu2. On
top of that we also report on the magnetocaloric effect and nature of magnetic
transition of a strongly anisotropic DyCu2 in its low dimension. Magnetization
measurements were carried out in the temperature range of 5 to 100 K and up to
the maximum magnetic field strength of 50 kOe. Magnetic entropy change delta SM
is estimated using the well known Maxwells equations and is found to be 4.31 J
per kg K. Indeed, the delta SM peak broadened marginally compared with its bulk
DyCu2 and such a broadening can be attributed to significant increase in the
total grain boundary volume. As these small flakes consists larger delta SM
values at temperatures higher than the Neel temperature TN, one can use them as
a magnetic refrigerant material in a broad temperature range. We also plotted
the M2 vs H by M in order to find the nature of magnetic transition. Arrott
plots infer that indeed there exists nonlinearity in M2 vs H by M behavior and
such nonlinear behavior is ascribed to the random anisotropy or a random field
that is present in the system.


title: Plethystic Vertex Operators and Boson-Fermion Correspondences

abstract:
  We study the algebraic properties of plethystic vertex operators, introduced
in J. Phys. A: Math. Theor. 43 405202 (2010), underlying the structure of
symmetric functions associated with certain generalized universal character
rings of subgroups of the general linear group, defined to stabilize tensors of
Young symmetry type characterized by a partition of arbitrary shape \pi. Here
we establish an extension of the well-known boson-fermion correspondence
involving Schur functions and their associated (Bernstein) vertex operators:
for each \pi, the modes generated by the plethystic vertex operators and their
suitably constructed duals, satisfy the anticommutation relations of a complex
Clifford algebra. The combinatorial manipulations underlying the results
involve exchange identities exploiting the Hopf-algebraic structure of certain
symmetric function series and their plethysms.


title: Probabilistic Model to Treat Flexibility in Molecular Contacts

abstract:
  Evaluating accessible conformational space is computationally expensive and
thermal motions are partly neglected in computer models of molecular
interactions. This produces error into the estimates of binding strength. We
introduce a method for modelling interactions so that structural flexibility is
inherently taken into account. It has a statistical model for 3D properties of
'nonlocal' contacts and a physics based description of 'local' interactions,
based on mechanical torque. The form of the torque barrier is derived using a
representation of the local electronic structure, which is presumed to improve
transferability, compared to traditional force fields. The nonlocal contacts
are more distant than 1-4 interactions and Target-atoms are represented by 3D
probability densities. Probability mass quantifies strength of contact and is
calculated as an overlap integral. Repulsion is described by negative
probability density, allowing probability mass to be used as the descriptor of
contact preference. As a result, we are able to transform the high-dimensional
problem into a simpler evaluation of three-dimensional integrals. We outline
how this scoring function gives a tool to study the enthalpy--entropy
compensation and demonstrate the feasibility of our approach by evaluating
numerical probability masses for chosen side chain to main chain contacts in a
lysine dipeptide structure.


title: Neutrino masses and mixing in $A_5$ with flavour antisymmetry

abstract:
  We discuss consequences of assuming that the (Majorana) neutrino mass matrix
$M_\nu$ and the charged lepton mass matrix $M_l$ satisfy, $S_\nu^T M_\nu
S_\nu=-M_\nu~,T_l^\dagger M_lM_l^\dagger T_l=M_lM_l^\dagger$ with respect to
some discrete groups $S_\nu,T_l$ contained in $A_5$. These assumptions lead to
a neutrino mass spectrum with two degenerate and one massless neutrino and also
constrain mixing among them. We derive possible mixing patterns following from
the choices $S_\nu=Z_2,~ Z_2\times Z_2$ and $T_l=Z_2, ~ Z_2\times Z_2, ~Z_3,
~Z_5$ as subgroups of $A_5$. One predicts the maximal atmospheric neutrino
mixing angle $\theta_{23}$ and $\mu$-$\tau$ reflection symmetry in large number
of cases but it is also possible to obtain non-maximal values for
$\theta_{23}$. Only the third column of the neutrino mixing matrix can be
obtained at the leading order due to degeneracy in masses of two of the
neutrinos. We take up a specific example within $A_5$ group and identify Higgs
vacuum expectations values which realize the above assumptions. Non-leading
terms present in this example are shown to lead to splitting among degenerate
pairs and a consistent description of both neutrino masses and mixing angles.


title:
Band gap tuning and orbital mediated electron phonon coupling in
  $HoFe_{1-x}Cr_xO_3$

abstract:
  We report on the evidenced orbital mediated electron phonon coupling and band
gap tuning in HoFe1-xCrxO3 compounds. From the room temperature Raman
scattering, it is apparent that the electron-phonon coupling is sensitive to
the presence of both the Fe and Cr at the B-site. Essentially, an Ag like local
oxygen breathing mode is activated due to the charge transfer between Fe3+ -
Cr3+ at around 670 cm-1, this observation is explained on the basis of
Franck-Condon (FC) mechanism. Optical absorption studies infer that there
exists a direct band gap in the HoFe1-xCrxO3 compounds. Decrease in band gap
until x = 0.5 is ascribed to the broadening of the oxygen p orbitals as a
result of the induced spin disorder due to Fe3+ and Cr3+ at B site. In
contrast, the increase in band gap above x = 0.5 is explained on the basis of
the reduction in the available unoccupied d - orbitals of Fe3+ at the
conduction band. We believe that above results would be helpful for the
development of the optoelectronic devices based on the ortho-ferrites.


title: Probing the magnetic field of the nearby galaxy pair Arp 269

abstract:
  We present a multiwavelength radio study of the nearby galaxy pair Arp 269
(NGC 4490/85). High sensitivity to extended structures gained by using the
merged interferometric and single- dish maps allowed us to reveal a previously
undiscovered extension of the radio continuum emission. Its direction is
significantly different from that of the neutral gas tail, suggesting that
different physical processes might be involved in their creation. The
population of radio- emitting electrons is generally young, signifying an
ongoing, vigorous star formation -- this claim is supported by strong magnetic
fields (over 20 {\mu}G), similar to the ones found in much larger spiral
galaxies. From the study of the spectral energy distribution, we conclude that
the electron population in the intergalactic bridge between member galaxies
originates from the disc areas, and therefore its age (approximately 3.7--16.9
Myr, depending on the model used) reflects the time-scale of the interaction.
We have also discovered an angularly near compact steep source -- which is a
member of a different galaxy pair -- at a redshift of approximately 0.125.


title: Gated Word-Character Recurrent Language Model

abstract:
  We introduce a recurrent neural network language model (RNN-LM) with long
short-term memory (LSTM) units that utilizes both character-level and
word-level inputs. Our model has a gate that adaptively finds the optimal
mixture of the character-level and word-level inputs. The gate creates the
final vector representation of a word by combining two distinct representations
of the word. The character-level inputs are converted into vector
representations of words using a bidirectional LSTM. The word-level inputs are
projected into another high-dimensional space by a word lookup table. The final
vector representations of words are used in the LSTM language model which
predicts the next word given all the preceding words. Our model with the gating
mechanism effectively utilizes the character-level inputs for rare and
out-of-vocabulary words and outperforms word-level language models on several
English corpora.


title: Regularizing Bayesian Predictive Regressions

abstract:
  We show that regularizing Bayesian predictive regressions provides a
framework for prior sensitivity analysis. We develop a procedure that jointly
regularizes expectations and variance-covariance matrices using a pair of
shrinkage priors. Our methodology applies directly to vector autoregressions
(VAR) and seemingly unrelated regressions (SUR). The regularization path
provides a prior sensitivity diagnostic. By exploiting a duality between
regularization penalties and predictive prior distributions, we reinterpret two
classic Bayesian analyses of macro-finance studies: equity premium
predictability and forecasting macroeconomic growth rates. We find there exist
plausible prior specifications for predictability in excess S&P 500 index
returns using book-to-market ratios, CAY (consumption, wealth, income ratio),
and T-bill rates. We evaluate the forecasts using a market-timing strategy, and
we show the optimally regularized solution outperforms a buy-and-hold approach.
A second empirical application involves forecasting industrial production,
inflation, and consumption growth rates, and demonstrates the feasibility of
our approach.


title:
New perspectives in the ultrafast spectroscopy of many-body excitations
  in correlated materials

abstract:
  Ultrafast spectroscopies constitute a fundamental tool to investigate the
dynamics of non-equilibrium many-body states in correlated materials.
Two-pulses (pump-probe) experiments have shed new light on the interplay
between high-energy electronic excitations and the emerging low-energy
properties, such as superconductivity and charge-order, in many interesting
materials. Here we will review some recent results on copper oxides and we will
propose the use of high-resolution multi-dimensional techniques to investigate
the decoherence processes of optical excitations in these systems. This novel
piece of information is expected to open a new route toward the understanding
of the fundamental interactions that lead to the exotic electronic and magnetic
properties of correlated materials.


title:
Enhanced spin reorientation temperature and origin of magnetocapacitance
  in HoFeO3

abstract:
  We report on the increase in the spin reorientation temperature in
HoFe0.5Cr0.5O3 compound by isovalent substitution Cr3+ at the Fe-site and the
magnetocapacitance in the HoFeO3 compound. Spin reorientation transition is
evident around 50 K and 150 K for the x = 0 and x = 0.5 compounds respectively.
The increase in the spin reorientation transition temperature in case of x =
0.5 compound can be attributed to the domination of the Ho3+ to Fe3+
interaction over the Fe3+ to Fe3+ interaction. Decrease in Neel temperature
from 643 K (x = 0) to 273 K (x = 0.5) can be ascribed to the decrease in the
interaction between antiferromagnetically aligned Fe3+ moments as a result of
the dilution of the Fe3+ moments with the Cr3+ addition. From the magnetization
M vs magnetic field H variation it is evident that the coercivity, HC decreases
for x = 0.5 compound, hinting the magnetic softening of the HoFeO3 compound.
Observed magnetocapacitance could be due to lossy dielectric mechanism in the
present compound. Indeed, present results would be helpful in understanding the
physics behind rare- earth orthoferrites.


title: An Uncertainty Principle of Paley and Wiener on Euclidean Motion Group

abstract:
  A classical result due to Paley and Wiener characterizes the existence of a
non-zero function in $L^2(\mathbb{R})$, supported on a half line, in terms of
the decay of its Fourier transform. In this paper we prove an analogue of this
result for compactly supported continuous functions on the Euclidean motion
group $M(n)$. We also relate this result to a uniqueness property of solutions
to the initial value problem for time-dependent Schr\"odinger equation on
$M(n)$.


title:
Enhanced harmonic generation and wave-mixing via two-color multiphoton
  excitation of atoms/molecules

abstract:
  We consider harmonics generation and wave-mixing by two-color multi photon
resonant excitation of three-level atoms/molecules in strong laser fields. The
coherent part of the spectra corresponding to multicolor harmonics generation
is investigated. The obtained analytical results on the basis of generalized
rotating wave approximation are in a good agreement with numerical
calculations. The results applied to the hydrogen atom and homonuclear diatomic
molecular ion show that one can achieve efficient generation of moderately high
multicolor harmonics via multiphoton resonant excitation by appropriate laser
pulses.


title: Parabolic Lipschitz truncation and Caloric Approximation

abstract:
  We develop an improved version of the parabolic Lipschitz truncation, which
allows qualitative control of the distributional time derivative and the
preservation of zero boundary values. As a consequence, we establish a new
caloric approximation lemma. We show functions. The distance is measured in
terms of spatial gradients as well as almost uniformly in time. Both results
are extended to the setting of Orlicz growth.


title:
Studying the SGR 1806-20/Cl* 1806-20 region using the \emph{Fermi} Large
  Area Telescope

abstract:
  The region around SGR 1806-20 and its host stellar cluster Cl* 1806-20 is a
potentially important site of particle acceleration. The soft $\gamma-$ray
repeater and Cl* 1806-20, which also contains several very massive stars
including a luminous blue variable hypergiant LBV 1806-20, are capable of
depositing a large amount of energy to the surroundings. Using the data taken
with the \emph{Fermi} Large Area Telescope (LAT), we identified an extended LAT
source to the south-west of Cl* 1806-20. The centroid of the 1-50~GeV emission
is consistent with that of HESS J1808-204 (until now unidentified). The LAT
spectrum is best-fit by a broken power-law with the break energy
$E_\mathrm{b}=297\pm15$ MeV. The index above $E_\mathrm{b}$ is $2.60\pm0.04$,
and is consistent with the flux and spectral index above 100 GeV for HESS
J1808-204, suggesting an association between the two sources. Meanwhile, the
interacting supernova remnant SNR G9.7-0.0 is also a potential contributor to
the LAT flux. A tentative flux enhancement at the MeV band during a 45-day
interval (2011 Jan 21 - 2011 Mar 7) is also reported. We discuss possible
origins of the extended LAT source in the context of both leptonic and hadronic
scenarios.


title: Quantifying Permission-Creep in the Google Play Store

abstract:
  Although there are over 1,600,000 third-party Android apps in the Google Play
Store, little has been conclusively shown about how their individual (and
collective) permission usage has evolved over time. Recently, Android 6
overhauled the way permissions are granted by users, by switching to run-time
permission requests instead of install-time permission requests. This is a
welcome change, but recent research has shown that many users continue to
accept run-time permissions blindly, leaving them at the mercy of third-party
app developers and adversaries. Beyond intentionally invading privacy, highly
privileged apps increase the attack surface of smartphones and are more
attractive targets for adversaries. This work focuses exclusively on dangerous
permissions, i.e., those permissions identified by Android as guarding access
to sensitive user data. By taking snapshots of the Google Play Store over a
20-month period, we characterise changes in the number and type of dangerous
permissions used by Android apps when they are updated, to gain a greater
understanding of the evolution of permission usage. We found that approximately
25,000 apps asked for additional permissions every three months. Worryingly, we
made statistically significant observations that free apps and highly popular
apps were more likely to ask for additional permissions when they were updated.
By looking at patterns in dangerous permission usage, we find evidence that
suggests developers may still be failing to correctly specify the permissions
their apps need.


title:
Comeback of epitaxial graphene for electronics: large-area growth of
  bilayer-free graphene on SiC

abstract:
  We present a new fabrication method for epitaxial graphene on SiC which
enables the growth of ultra-smooth defect- and bilayer-free graphene sheets
with an unprecedented reproducibility, a necessary prerequisite for wafer-scale
fabrication of high quality graphene-based electronic devices. The inherent but
unfavorable formation of high SiC surface terrace steps during high temperature
sublimation growth is suppressed by rapid formation of the graphene buffer
layer which stabilizes the SiC surface. The enhanced nucleation is enforced by
decomposition of polymer adsorbates which act as a carbon source. With most of
the steps well below 0.75 nm pure monolayer graphene without bilayer inclusions
is formed with lateral dimensions only limited by the size of the substrate.
This makes the polymer assisted sublimation growth technique the most promising
method for commercial wafer scale epitaxial graphene fabrication. The
extraordinary electronic quality is evidenced by quantum resistance metrology
at 4.2 K with until now unreached precision and high electron mobilities on mm
scale devices.


title: Single-edge transport in an InAs/GaSb quantum spin Hall insulator

abstract:
  We report transport measurements in a single edge channel of an InAs/GaSb
quantum spin Hall insulator, where the conduction occurs through only one pair
of counterpropagating edge modes. By using a specific sample design involving
highly asymmetric current paths, we electrically isolate a single edge channel
of the two-dimensional topological insulator from the other edge. This enables
us to probe a single edge by multiterminal measurements. Both two-terminal and
four-terminal resistances show a nearly quantized plateau around $h/e^2$ for a
4-$\mu$m-long edge, indicating quasiballistic transport. Our approach is
advantageous in that it allows us to gain insight into a microscopic region
from local measurements.


title: Evolution of gossip-based indirect reciprocity on a bipartite network

abstract:
  Cooperation can be supported by indirect reciprocity via reputation.Thanks to
gossip, reputations are built and circulated and humans can identify defectors
and ostracise them. However, the evolutionary stability of gossip is allegedly
undermined by the fact that it is more error-prone that direct observation,
whereas ostracism could be ineffective if the partner selection mechanism is
not robust. The aim of this work is to investigate the conditions under which
the combination of gossip and ostracism might support cooperation in groups of
different sizes. We are also interested in exploring the extent to which errors
in transmission might undermine the reliability of gossip as a mechanism for
identifying defectors. Our results show that a large quantity of gossip is
necessary to support cooperation, and that group structure can mitigate the
effects of errors in transmission.


title:
On q-deformed symmetries as Poisson-Lie symmetries and application to
  Yang-Baxter type models

abstract:
  Yang-Baxter type models are integrable deformations of integrable field
theories, such as the principal chiral model on a Lie group $G$ or
$\sigma$-models on (semi-)symmetric spaces $G/F$. The deformation has the
effect of breaking the global $G$-symmetry of the original model, replacing the
associated set of conserved charges by ones whose Poisson brackets are those of
the $q$-deformed Poisson-Hopf algebra $\mathscr U_q(\mathfrak g)$. Working at
the Hamiltonian level, we show how this $q$-deformed Poisson algebra originates
from a Poisson-Lie $G$-symmetry. The theory of Poisson-Lie groups and their
actions on Poisson manifolds, in particular the formalism of the non-abelian
moment map, is reviewed. For a coboundary Poisson-Lie group $G$, this
non-abelian moment map must obey the Semenov-Tian-Shansky bracket on the dual
group $G^*$, up to terms involving central quantities. When the latter vanish,
we develop a general procedure linking this Poisson bracket to the defining
relations of the Poisson-Hopf algebra $\mathscr U_q(\mathfrak g)$, including
the $q$-Poisson-Serre relations. We consider reality conditions leading to $q$
being either real or a phase. We determine the non-abelian moment map for
Yang-Baxter type models. This enables to compute the corresponding action of
$G$ on the fields parametrising the phase space of these models.


title:
Nonequilibrium mechanisms underlying de novo biogenesis of Golgi
  cisternae

abstract:
  A central issue in cell biology is the physico-chemical basis of organelle
biogenesis in intracellular trafficking pathways, its most impressive
manifestation being the biogenesis of Golgi cisternae. At a basic level, such
morphologically and chemically distinct compartments should arise from an
interplay between the molecular transport and chemical maturation. Here, we
formulate analytically tractable, minimalist models, that incorporate this
interplay between transport and chemical progression in physical space, and
explore the conditions for de novo biogenesis of distinct cisternae. We propose
new quantitative measures that can discriminate between the various models of
transport in a qualitative manner- this includes measures of the dynamics in
steady state and the dynamical response to perturbations of the kind amenable
to live-cell imaging.


title: Characteristics of the flankmagnetopause: Cluster observations

abstract:
  The magnetopause is a current sheet forming the boundary between the
geomagnetic field on one side and the shocked solar wind on the other side.
This paper discusses properties of the low-latitude dawn and dusk flanks of the
magnetopause. The reported results are based on a large number of measurements
obtained by the Cluster satellites during magnetopause traversals. Using a
combination of single-spacecraft and multispacecraft techniques, we calculated
macroscopic features such as thickness, location, and motion of the
magnetopause. The results show that the typical flank magnetopause is
significantly thicker than the dayside magnetopause and also possesses a
pronounced and persistent dawn-dusk asymmetry. Thicknesses vary from 150 to
5000 km, with an median thickness of around 1400 km at dawn and around 1150 km
at dusk. Current densities are on average higher on dusk, suggesting that the
total current at dawn and dusk are similar. Solar wind conditions and the
interplanetary magnetic field cannot fully explain the observed dawn-dusk
asymmetry. For a number of crossings we were also able to derive detailed
current density profiles. The profiles show that the magnetopause often
consists of two or more adjacent current sheets, each current sheet typically
several ion gyroradii thick and often with different current direction. This
demonstrates that the flank magnetopause has a structure that is more complex
than the thin, one-dimensional current sheet described by a Chapman-Ferraro
layer.


title: On Dirichlet Products Evaluated at Fibonacci Numbers

abstract:
  In this work we discuss Dirichlet products evaluated at Fibonacci numbers. As
first applications of the results we get a representation of Fibonacci numbers
in terms of Euler's totient function, an upper bound on the number of primitive
prime divisors and representations of some related Euler products. Moreover, we
sum functions over all primitive divisors of a Fibonacci number and obtain a
non--trivial fixed point of this operation.


title:
Towards a first design of a Newtonian-noise cancellation system for
  Advanced LIGO

abstract:
  Newtonian gravitational noise from seismic fields is predicted to be a
limiting noise source at low frequency for second generation gravitational-wave
detectors. Mitigation of this noise will be achieved by Wiener filtering using
arrays of seismometers deployed in the vicinity of all test masses. In this
work, we present optimized configurations of seismometer arrays using a variety
of simplified models of the seismic field based on seismic observations at LIGO
Hanford. The model that best fits the seismic measurements leads to noise
reduction limited predominantly by seismometer self-noise. A first simplified
design of seismic arrays for Newtonian-noise cancellation at the LIGO sites is
presented, which suggests that it will be sufficient to monitor surface
displacement inside the buildings.


title:
Observation of two-species vortex lattices in a mixture of
  mass-imbalance Bose and Fermi superfluids

abstract:
  The superfluid mixture of interacting Bose and Fermi species is a remarkable
many-body quantum system. Dilute degenerate atomic gases, especially for two
species of distinct masses, are excellent candidates for exploring fundamental
features of superfluid mixture. However, producing a mass-imbalance Bose-Fermi
superfluid mixture, providing an unambiguous visual proof of two-species
superfluidity and probing inter-species interaction effects remain challenging.
Here, we report the realization of a two-species superfluid of lithium-6 and
potassium-41. By rotating the dilute gases, we observe the simultaneous
existence of vortex lattices in both species, and thus present a definitive
visual evidence for the simultaneous superfluidity of the two species.
Pronounced effects of the inter-species interaction are demonstrated through a
series of precision measurements on the formation and decay of two-species
vortices. Our system provides a new platform for studying novel macroscopic
quantum phenomena in vortex matter of interacting species.


title:
A sharp regularization error estimate for bang-bang solutions for an
  iterative Bregman regularization method for optimal control problems

abstract:
  In the present work, we present numerical results for an iterative method for
solving an optimal control problem with inequality contraints. The method is
based on generalized Bregman distances. Under a combination of a source
condition and a regularity condition on the active sets convergence results are
presented. Furthermore we show by numerical examples that the provided a-priori
estimate is sharp in the bang-bang case.


title:
On the Synchronization of Intermittently Powered Wireless Embedded
  Systems

abstract:
  Battery-free computational RFID platforms, such as WISP (Wireless
Identification and Sensing Platform), are emerging intermittently powered
devices designed for replacing existing battery-powered sensor networks. As
their applications become increasingly complex, we anticipate that
synchronization (among others) to appear as one of crucial building blocks for
collaborative and coordinated actions. With this paper we aim at providing
initial observations regarding the synchronization of intermittently powered
systems. In particular, we design and implement the first and very initial
synchronization protocol for the WISP platform that provides explicit
synchronization among individual WISPs that reside inside the communication
range of a common RFID reader. Evaluations in our testbed showed that with our
mechanism a synchronization error of approximately 1.5 milliseconds can be
ensured between the RFID reader and a WISP tag.


title: Proof nets for the Displacement calculus

abstract:
  We present a proof net calculus for the Displacement calculus and show its
correctness. This is the first proof net calculus which models the Displacement
calculus directly and not by some sort of translation into another formalism.
The proof net calculus opens up new possibilities for parsing and proof search
with the Displacement calculus.


title: Less is More: Micro-expression Recognition from Video using Apex Frame

abstract:
  Despite recent interest and advances in facial micro-expression research,
there is still plenty room for improvement in terms of micro-expression
recognition. Conventional feature extraction approaches for micro-expression
video consider either the whole video sequence or a part of it, for
representation. However, with the high-speed video capture of micro-expressions
(100-200 fps), are all frames necessary to provide a sufficiently meaningful
representation? Is the luxury of data a bane to accurate recognition? A novel
proposition is presented in this paper, whereby we utilize only two images per
video: the apex frame and the onset frame. The apex frame of a video contains
the highest intensity of expression changes among all frames, while the onset
is the perfect choice of a reference frame with neutral expression. A new
feature extractor, Bi-Weighted Oriented Optical Flow (Bi-WOOF) is proposed to
encode essential expressiveness of the apex frame. We evaluated the proposed
method on five micro-expression databases: CAS(ME)$^2$, CASME II, SMIC-HS,
SMIC-NIR and SMIC-VIS. Our experiments lend credence to our hypothesis, with
our proposed technique achieving a state-of-the-art F1-score recognition
performance of 61% and 62% in the high frame rate CASME II and SMIC-HS
databases respectively.


title:
A Constructive Proof of Coherence for Symmetric Monoidal Categories
  Using Rewriting

abstract:
  A symmetric monoidal category is a category equipped with an associative and
commutative (binary) product and an object which is the unit for the product.
In fact, those properties only hold up to natural isomorphisms which satisfy
some coherence conditions. The coherence theorem asserts the commutativity of
all linear diagrams involving the left and right unitors, the associator and
the braiding.
  We prove the coherence for symmetric monoidal categories using a homotopical
method based on rewriting. For that scope, we detail the con vergence proof of
Lafont's string diagram rewriting system which presents the isomorphisms of
these theories.


title: Connecting Atomistic and Continuous Models of Elastodynamics

abstract:
  We prove long-time existence of solutions for the equations of atomistic
elastodynamics on a bounded domain with time-dependent boundary values as well
as their convergence to a solution of continuum nonlinear elastodynamics as the
interatomic distances tend to zero. Here, the continuum energy density is given
by the Cauchy-Born rule. The models considered allow for general finite range
interactions. To control the stability of large deformations we also prove a
new atomistic G{\aa}rding inequality.


title:
Self-similar extinction for a diffusive Hamilton-Jacobi equation with
  critical absorption

abstract:
  The behavior near the extinction time is identified for non-negative
solutions to the diffusive Hamilton-Jacobi equation with critical gradient
absorption $\partial_t u - \Delta_p u + |\nabla u|^{p-1} = 0$ in $(0, \infty)
\times \mathbb{R}^N$, and fast diffusion $2N/(N + 1) < p < 2$. Given a
non-negative and radially symmetric initial condition with a non-increasing
profile which decays sufficiently fast as $|x| \to \infty$, it is shown that
the corresponding solution $u$ to the above equation approaches a uniquely
determined separate variable solution of the form $U(t, x) = (T_e -
t)^{1/(2-p)} f_* (|x|), (t, x) \in (0, T_e) \times \mathbb{R}^N$, as $t \to
T_e$, where $T_e$ denotes the finite extinction time of $u$. A cornerstone of
the convergence proof is an underlying variational structure of the equation.
Also, the selected profile $f_*$ is the unique non-negative solution to a
second order ordinary differential equation which decays exponentially at
infinity. A complete classification of solutions to this equation is provided,
thereby describing all separate variable solutions of the original equation.
One important difficulty in the uniqueness proof is that no monotonicity
argument seems to be available and it is overcome by the construction of an
appropriate Pohozaev functional.


title:
On Complete Convergence in Mean for Double Sums of Independent Random
  Elements in Banach Spaces

abstract:
  In this work, conditions are provided under which a normed double sum of
independent random elements in a real separable Rademacher type $p$ Banach
space converges completely to $0$ in mean of order $p$. These conditions for
the complete convergence in mean of order $p$ are shown to provide an exact
characterization of Rademacher type $p$ Banach spaces. In case the Banach space
is not of Rademacher type $p$, it is proved that the complete convergence in
mean of order $p$ of a normed double sum implies a strong law of large numbers.


title: Amenability and representation theory of pro-Lie groups

abstract:
  We develop a semigroup approach to representation theory for pro-Lie groups
satisfying suitable amenability conditions. As an application of our approach,
we establish a one-to-one correspondence between equivalence classes of unitary
irreducible representations and coadjoint orbits for a class of pro-Lie groups
including all connected locally compact nilpotent groups and arbitrary infinite
direct products of nilpotent Lie groups. The usual $C^*$-algebraic approach to
group representation theory positivey breaks down for infinite direct products
of non-compact locally compact groups, hence the description of their unitary
duals in terms of coadjoint orbits is particularly important whenever it is
available, being the only description known so far.


title:
Hochschild cohomology of group extensions of quantum complete
  intersections

abstract:
  We formulate the Gerstenhaber algebra structure of Hochschild cohomology of
finite group extensions of some quantum complete intersections. When the group
is trivial, this work characterizes the graded Lie brackets on Hochschild
cohomology of these quantum complete intersections, previously only known for a
few cases. As an example, we compute the algebra structure for two generator
quantum complete intersections extended by select groups.


title:
Non-Markovian property of afterpulsing effect in single-photon avalanche
  detector

abstract:
  The single-photon avalanche photodiode(SPAD) has been widely used in research
on quantum optics. The afterpulsing effect, which is an intrinsic character of
SPAD, affects the system performance in most experiments and needs to be
carefully handled. For a long time, afterpulsing has been presumed to be
determined by the pre-ignition avalanche. We studied the afterpulsing effect of
a commercial InGaAs/InP SPAD (The avalanche photodiode model is: Princeton
Lightwave PGA-300) and demonstrated that its afterpulsing is non-Markovian,
with a memory effect in the avalanching history. Theoretical analysis and
experimental results clearly indicate that the embodiment of this memory effect
is the afterpulsing probability, which increases as the number of
ignition-avalanche pulses increase. This conclusion makes the principle of the
afterpulsing effect clearer and is instructive to the manufacturing processes
and afterpulsing evaluation of high-count-rate SPADs. It can also be regarded
as a fundamental premise to handle the afterpulsing signals in many
applications, such as quantum communication and quantum random number
generation.


title:
Excitonic Emission in Organic-Inorganic Lead Iodide Perovskite Single
  Crystals

abstract:
  Hybrid perovskite thin films have demonstrated impressive performance for
solar energy conversion and optoelectronic applications. However, further
progress will benefit from a better knowledge of the intrinsic photophysics of
materials. Here, the low temperature emission properties of CH3NH3PbI3 single
crystals are investigated and compared to those of thin polycrystalline films
by means of steady-state and time-resolved photoluminescence spectroscopy.
While the emission properties of thin films and crystals appear relatively
similar at room temperature, low temperature photoluminescence spectroscopy
reveals striking differences between the two materials. Single crystals
photoluminescence exhibits a sharp excitonic emission at high energy, with Full
Width at Half Maximum of only 5 meV, assigned to free excitonic recombination
and a broad band at low energy. We analyzed the thermal evolution of the free
excitonic intensity and linewidth. An excitonic binding energy of 28 meV is
extracted from the quenching of the photoluminescence. We highlight a strong
broadening of the emission due to LO phonon coupling. The free excitonic
emission turned to be very short-lived with a sub-nanosecond dynamics, mainly
induced by the fast trapping of the excitons. The free excitonic emission is
completely absent of the thin films spectra, which are dominated by trap states
band. The trap states energies, width and recombination dynamics present
important similarities between films and crystals. These results suggest that
the trap states are formed at the surface and grain interface of perovskites.


title:
What is the appropriate coordinate system for magnetometer data when
  analyzing ionospheric currents?

abstract:
  In this paper we investigate which coordinate representation is most
appropriate when analyzing ground magnetometer data in terms of ionospheric
currents, in particular the westward electrojet. The $\textit{AL}$ and the
recently introduced $\textit{SML}$ index are frequently used as monitors of the
westward electrojet. Both indices are based on ground magnetometers at auroral
latitudes. From these magnetometers, the largest perturbation in the southward
direction is selected as the $\textit{ AL/SML }$ index at 1 min cadence. The
southward component is defined as antiparallel to the orientation of the
horizontal part of the Earths' main field, $\textbf{B}_{0, \textit{H}}$. The
implicit assumption when using these indices as a monitor of the westward
electrojet is that the electrojet flows perpendicular to $\textbf{B}_{0,
\textit{H}}$. However, $\textbf{B}_{0, \textit{H}}$ is, in general, not
perpendicular to the westward direction in coordinate systems that take
nondipole terms of the Earth's magnetic field into account, such as apex and
the Altitude Adjusted Corrected Geomagnetic coordinate systems. In this paper
we derive a new $\textit{SML}$ index, based on apex coordinates. We find that
the new index has less variation with longitude and universal time (UT),
compared to the traditionally defined $\textit{SML}$. We argue that when
analyzing ionospheric currents using magnetometers, it is appropriate to
convert the components to a corrected geomagnetic system. This is most
important when considering longitudinal or UT variations, or when data from a
limited region are used.


title: Examples of flag-wise positively curved spaces

abstract:
  A Finsler space $(M,F)$ is called flag-wise positively curved, if for any
$x\in M$ and any tangent plane $\mathbf{P}\subset T_xM$, we can find a nonzero
vector $y\in \mathbf{P}$, such that the flag curvature $K^F(x,y,
\mathbf{P})>0$. Though compact positively curved spaces are very rare in both
Riemannian and Finsler geometry, flag-wise positively curved metrics should be
easy to be found. A generic Finslerian perturbation for a non-negatively curved
homogeneous metric may have a big chance to produce flag-wise positively curved
metrics. This observation leads our discovery of these metrics on many compact
manifolds. First we prove any Lie group $G$ such that its Lie algebra
$\mathfrak{g}$ is compact non-Abelian and $\dim\mathfrak{c}(\mathfrak{g})\leq
1$ admits flag-wise positively curved left invariant Finsler metrics. Similar
techniques can be applied to our exploration for more general compact coset
spaces. We will prove, whenever $G/H$ is a compact simply connected coset
space, $G/H$ and $S^1\times G/H$ admit flag-wise positively curved Finsler
metrics. This provides abundant examples for this type of metrics, which are
not homogeneous in general.


title: Quenching parameter in a holographic thermal QCD

abstract:
  We have calculated the quenching parameter, $\hat{q}$ in a model-independent
way using the gauge-gravity duality. In earlier calculations, the geometry in
the gravity side at finite temperature was usually taken as the pure AdS
blackhole metric for which the dual gauge theory becomes conformally invariant
unlike QCD. Therefore we use a metric which incorporates the fundamental quarks
by embedding the coincident D7 branes in the Klebanov-Tseytlin background and a
finite temperature is switched on by inserting a black hole into the
background, known as OKS-BH metric. Further inclusion of an additional UV cap
to the metric prepares the dual gauge theory to run similar to thermal QCD.
Moreover $\hat{q}$ is usually defined in the literature from the Glauber-model
perturbative QCD evaluation of the Wilson loop, which has no reasons to hold if
the coupling is large and is thus against the main idea of gauge-gravity
duality. Thus we use an appropriate definition of $\hat{q}$: $\hat{q} L^- =
1/L^2$, where $L$ is the separation for which the Wilson loop is equal to some
specific value. The above two refinements cause $\hat{q}$ to vary with the
temperature as $T^4$ always and to depend linearly on the light-cone time $L^-$
with an additional ($1/L^-$) correction term in the short-distance limit
whereas in the long-distance limit, it depends only linearly on $L^-$ with no
correction term. These observations agree with other holographic calculations
directly or indirectly.


title: Dissipative Entanglement of Quantum Spin Fluctuations

abstract:
  We consider two non-interacting infinite quantum spin chains immersed in a
common thermal environment and undergoing a local dissipative dynamics of
Lindblad type. We study the time evolution of collective mesoscopic quantum
spin fluctuations that, unlike macroscopic mean-field observables, retain a
quantum character in the thermodynamical limit. We show that the microscopic
dissipative dynamics is able to entangle these mesoscopic degrees of freedom,
through a purely mixing mechanism. Further, the behaviour of the dissipatively
generated quantum correlations between the two chains is studied as a function
of temperature and dissipation strength.


title:
The different origins of high- and low-ionization broad emission lines
  revealed by gravitational microlensing in the Einstein cross

abstract:
  We investigate the kinematics and ionization structure of the broad emission
line region of the gravitationally lensed quasar QSO2237+0305 (the Einstein
cross) using differential microlensing in the high- and low-ionization broad
emission lines. We combine visible and near-infrared spectra of the four images
of the lensed quasar and detect a large-amplitude microlensing effect
distorting the high-ionization CIV and low-ionization H$\alpha$ line profiles
in image A. While microlensing only magnifies the red wing of the Balmer line,
it symmetrically magnifies the wings of the CIV emission line. Given that the
same microlensing pattern magnifies both the high- and low-ionization broad
emission line regions, these dissimilar distortions of the line profiles
suggest that the high- and low-ionization regions are governed by different
kinematics. Since this quasar is likely viewed at intermediate inclination, we
argue that the differential magnification of the blue and red wings of
H$\alpha$ favors a flattened, virialized, low-ionization region whereas the
symmetric microlensing effect measured in CIV can be reproduced by an emission
line formed in a polar wind, without the need of fine-tuned caustic
configurations.


title: Integrated perception with recurrent multi-task neural networks

abstract:
  Modern discriminative predictors have been shown to match natural
intelligences in specific perceptual tasks in image classification, object and
part detection, boundary extraction, etc. However, a major advantage that
natural intelligences still have is that they work well for "all" perceptual
problems together, solving them efficiently and coherently in an "integrated
manner". In order to capture some of these advantages in machine perception, we
ask two questions: whether deep neural networks can learn universal image
representations, useful not only for a single task but for all of them, and how
the solutions to the different tasks can be integrated in this framework. We
answer by proposing a new architecture, which we call "MultiNet", in which not
only deep image features are shared between tasks, but where tasks can interact
in a recurrent manner by encoding the results of their analysis in a common
shared representation of the data. In this manner, we show that the performance
of individual tasks in standard benchmarks can be improved first by sharing
features between them and then, more significantly, by integrating their
solutions in the common representation.


title:
Measurement of the double-differential high-mass Drell-Yan cross section
  in pp collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector

abstract:
  This paper presents a measurement of the double-differential cross section
for the Drell-Yan $Z/\gamma^{*} \rightarrow \ell^{+} \ell^{-}$ and
photon-induced $\gamma\gamma \rightarrow \ell^{+} \ell^{-}$ processes where
$\ell$ is an electron or muon. The measurement is performed for invariant
masses of the lepton pairs, $m_{\ell\ell}$, between 116 GeV and 1500 GeV, using
a sample of 20.3 fb$^{-1}$ of pp collisions data at centre-of-mass energy of
$\sqrt{s}$ = 8 TeV collected by the ATLAS detector at the LHC in 2012. The data
are presented double differentially in invariant mass and absolute dilepton
rapidity as well as in invariant mass and absolute pseudorapidity separation of
the lepton pair. The single-differential cross section as a function of
$m_{\ell\ell}$ is also reported. The electron and muon channel measurements are
combined and a total experimental precision of better than 1% is achieved at
low $m_{\ell\ell}$. A comparison to next-to-next-to-leading order perturbative
QCD predictions using several recent parton distribution functions and
including next-to-leading order electroweak effects indicates the potential of
the data to constrain parton distribution functions. In particular, a large
impact of the data on the photon PDF is demonstrated.


title:
Computational design of nanophotonic structures using an adaptive finite
  element method

abstract:
  We consider the problem of the construction of the nanophotonic structures of
arbitrary geometry with prescribed desired properties. We reformulate this
problem as an optimization problem for the Tikhonov functional which is
minimized on adaptively locally refined meshes. These meshes are refined only
in places where the nanophotonic structure should be designed. Our special
symmetric mesh refinement procedure allows the construction of different
nanophotonic structures. We illustrate efficiency of our adaptive optimization
algorithm on the construction of nanophotonic structure in two dimensions.


title:
Longitudinal electromagnetic waves in the framework of standard
  classical electrodynamics

abstract:
  Theoretical comment for the registration of longitudinal electric waves in
interacting laser beams is given. Recent information on longitudinal electric
and scalar waves in plasma, plasmons, waveguides, antennas and nano-structures
is considered. The link between the longitudinal electromagnetic waves and the
system of Maxwell equations is demonstrated. The longitudinal wave component of
the electric field strength vector is found as the exact solution of the
standard Maxwell equations with specific gradient-type case of electric current
and charge densities. The corresponded scalar wave is found as well. The
necessary comment on the paper of K.J. van Vlaenderen and A. Waser is given.
The possible experimental situation is discussed briefly. Following the
Bialynicki-Birula's proposition to give the name for the well known complex
3-vector of electromagnetic field strengths, the suggestion to call the much
more interesting 4-vector of this kind as Riemann--Silberstein--Darwin vector
is given.


title:
Two-sided bounds of eigenvalues - local efficiency and convergence of
  adaptive algorithm

abstract:
  We generalize and analyse the method for computing lower bounds of the
principal eigenvalue proposed in our previous paper (I. Sebestova, T.
Vejchodsky, SIAM J. Numer. Anal. 2014). This method is suitable for symmetric
elliptic eigenvalue problems with mixed boundary conditions of Dirichlet,
Neumann, and Robin type and it is based on a posteriori error analysis using
flux reconstructions. We improve the original result in several aspects. We
show how to obtain lower bounds even for higher eigenvalues. We present a local
approach for the flux reconstruction enabling efficient implementation. We
prove the equivalence of the resulting estimator with the classical residual
estimator and consequently its local efficiency. We also prove the convergence
of the corresponding adaptive algorithm. Finally, we illustrate the practical
performance of the method by numerical examples.


title:
Microgrid Revenue Maximization by Charging Scheduling of EVs in Multiple
  Parking Stations

abstract:
  Nowadays, there has been a rapid growth in global usage of the electronic
vehicles (EV). Despite apparent environmental and economic advantages of EVs,
their high demand charging jobs pose an immense challenge to the existing
electricity grid infrastructure. In microgrids, as the small-scale version of
traditional power grid, however, the EV charging scheduling is more
challenging. This is because, the microgrid owner, as a large electricity
customer, is interested in shaving its global peak demand, i.e., the aggregated
demand over multiple parking stations, to reduce total electricity cost. While
the EV charging scheduling problem in single station scenario has been studied
extensively in the previous research, the microgrid-level problem with multiple
stations subject to a global peak constraint is not tackled. This paper aims to
propose a near-optimal EV charging scheduling mechanism in a microgrid governed
by a single utility provider with multiple charging stations. The goal is to
maximize the total revenue while respecting both local and global peak
constraints. The underlying problem, however, is a NP-hard mixed integer linear
problem which is difficult to tackle and calls for approximation algorithm
design. We design a primaldual scheduling algorithm which runs in polynomial
time and achieves bounded approximation ratio. Moreover, the proposed global
scheduling algorithm applies a valley-filling strategy to further reduce the
global peak. Simulation results show that the performance of the proposed
algorithm is 98% of the optimum, which is much better than the theoretical
bound obtained by our approximation analysis. Our algorithm reduces the peak
demand obtained by the existing alternative algorithm by 16% and simultaneously
achieves better resource utilization.


title: Mass of the bottom quark from Upsilon(1S) at NNNLO: an update

abstract:
  We update our perturbative determination of MSbar bottom quark mass mb(mb),
by including the recently obtained four-loop coefficient in the relation
between the pole and MSbar mass. First the renormalon subtracted (RS or RS')
mass is determined from the known mass of the Upsilon(1S) meson, where we use
the renormalon residue Nm obtained from the asymptotic behavior of the
coefficient of the 3-loop static singlet potential. MSbar mass is then obtained
using the 4-loop renormalon-free relation between the RS (RS') and MSbar mass.
We argue that the effects of the charm quark mass are accounted for by
effectively using Nf=3 in the mass relations. The extracted value is mb(mb) =
4222(40) MeV, where the uncertainty is dominated by the renormalization scale
dependence.


title: Adaptive Distributed Top-k Query Processing

abstract:
  ADiT is an adaptive approach for processing distributed top-$k$ queries over
peer-to-peer networks optimizing both system load and query response time. This
approach considers the size of the peer to peer network, the amount $k$ of
searched objects, the network capabilities of a connected peer, i.e. the
transmission rate, the amount of objects stored on each peer, and the speed of
a peer in processing a local top-$k$ query. In extensive experiments with a
variety of scenarios we could show that ADiT outperforms state of the art
distributed query processing techniques.


title: X-ray flashes powered by the spindown of long-lived neutron stars

abstract:
  X-ray flashes (XRFs) are a class of high-energy transients whose nature is
still open to question. Similar in many aspects to common gamma-ray bursts
(GRBs), their strong X-ray emission is accompanied by very low or absent
emission in the gamma-ray band. Despite this key difference, a number of
indications have consolidated the idea that XRFs and GRBs share a common
origin, including a number of potential XRF/supernova associations and the
consistency of some XRFs with the Amati relation for long GRBs. However, the
difficulties in explaining XRFs as off-axis or intrinsically weak GRBs still
cast doubts on this interpretation. Here we explore the possibility that some
XRFs are instead powered by the spindown of a long-lived neutron star (NS)
formed in a binary NS (BNS) merger or, possibly, in a core-collapse supernova.
Focusing on XRF 020903 and a few other cases observed by HETE-2, we show that
their lack of gamma-ray emission, spectral properties, duration and X-ray
luminosity find a natural explanation within our hypothesis. Moreover, we point
out that the agreement of XRF 020903 with the Amati and Ghirlanda relations for
long GRBs is respectively only marginal and problematic. Assuming a BNS merger
origin for the long-lived NS, we use XRF observations to estimate a lower limit
on the rate of BNS mergers accompanied by a potentially observable XRF signal.
Within the reach of the advanced LIGO and Virgo gravitational wave detectors,
we find >0.02-0.05 1/yr. Finally, we discuss the implications of a supernova
association for the XRF events considered.


title:
Transit Timing Observations from Kepler. IX. Catalog of the Full
  Long-Cadence Data Set

abstract:
  We present a new transit timing catalog of 2599 Kepler Objects of Interest
(=KOIs), using the PDC-MAP long-cadence light curves that include the full
seventeen quarters of the mission (ftp://wise-
ftp.tau.ac.il/pub/tauttv/TTV/ver_112). The goal is to produce an easy-to-use
catalog that can stimulate further analyses of interesting systems. For 779
KOIs with high enough SNRs, we derived the timing, duration and depth of 69,914
transits. For 1820 KOIs with lower SNR, we derived only the timing of 225,273
transits. After removal of outlier timings, we derived various statistics for
each KOI that were used to indicate significant variations. Including systems
found by previous works, we have detected 260 KOIs which showed significant
TTVs with long-term variations (>100 day), and another fourteen KOIs with
periodic modulations shorter than 100 day and small amplitudes. For five of
those, the periodicity is probably due to the crossing of rotating stellar
spots by the transiting planets.


title:
Computing the generator polynomials of
  $\mathbb{Z}_2\mathbb{Z}_4$-additive cyclic codes

abstract:
  A ${\mathbb{Z}}_2{\mathbb{Z}}_4$-additive code ${\cal
C}\subseteq{\mathbb{Z}}_2^\alpha\times{\mathbb{Z}}_4^\beta$ is called cyclic if
the set of coordinates can be partitioned into two subsets, the set of
${\mathbb{Z}}_2$ and the set of ${\mathbb{Z}}_4$ coordinates, such that any
simultaneous cyclic shift of the coordinates of both subsets leaves invariant
the code. These codes can be identified as submodules of the
$\mathbb{Z}_4[x]$-module
$\mathbb{Z}_2[x]/(x^\alpha-1)\times\mathbb{Z}_4[x]/(x^\beta-1)$. Any
$\mathbb{Z}_2\mathbb{Z}_4$-additive cyclic code ${\cal C}$ is of the form
$\langle (b(x)\mid{ 0}), (\ell(x) \mid f(x)h(x) +2f(x)) \rangle$ for some
$b(x), \ell(x)\in\mathbb{Z}_2[x]/(x^\alpha-1)$ and $f(x),h(x)\in
{\mathbb{Z}}_4[x]/(x^\beta-1)$. A new algorithm is presented to compute the
generator polynomials for ${\mathbb{Z}}_2{\mathbb{Z}}_4$-additive cyclic codes.


title: Unsupervised classification of children's bodies using currents

abstract:
  Object classification according to their shape and size is of key importance
in many scientific fields. This work focuses on the case where the size and
shape of an object is characterized by a current}. A current is a mathematical
object which has been proved relevant to the modeling of geometrical data, like
submanifolds, through integration of vector fields along them. As a consequence
of the choice of a vector-valued Reproducing Kernel Hilbert Space (RKHS) as a
test space for integrating manifolds, it is possible to consider that shapes
are embedded in this Hilbert Space. A vector-valued RKHS is a Hilbert space of
vector fields; therefore, it is possible to compute a mean of shapes, or to
calculate a distance between two manifolds. This embedding enables us to
consider size-and-shape classification algorithms.
  These algorithms are applied to a 3D database obtained from an anthropometric
survey of the Spanish child population with a potential application to online
sales of children's wear.


title: Neutron electric dipole moment in the minimal 3-3-1 model

abstract:
  We calculate the electric dipole moment (EDM) for the neutron in the
framework of the minimal 3-3-1 model. We assume that the only source of $CP$
violation arises from a complex trilinear coupling constant and two complex
vacuum expectation values. However, from the constraint equations obtained from
the potential, only one physical phase remains. We find some constraints on the
possible values of this phase and masses of the exotic particles.


title: Genealogy of the extremal process of the branching random walk

abstract:
  The extremal process of a branching random walk is the point measure
recording the position of particles alive at time $n$, shifted around the
expected position of the minimal position. Madaule proved that this point
measure converges, as $n \to \infty$, toward a randomly shifted, decorated
Poisson point process. In this article, we study the joint convergence of the
extremal process together with its genealogical informations. This result is
then used to describe the law of the decoration in the limiting process, as
well as to study the supercritical Gibbs measures of the branching random walk.


title:
A gamma approximation to the Bayesian posterior distribution of a
  discrete parameter of the Generalized Poisson model

abstract:
  Let $X$ have a Generalized Poisson distribution with mean $kb$, where $b$ is
a known constant in the unit interval and $k$ is a discrete, non-negative
parameter. We show that if an uninformative uniform prior for $k$ is assumed,
then the posterior distribution of $k$ can be approximated using the gamma
distribution when $b$ is small.


title:
On the Degrees of Freedom of MIMO X Networks with Non-Cooperation
  Transmitters

abstract:
  Due to limited backhaul/feedback link capacity and channel state information
(CSI) feedback delay, obtaining global and instantaneous channel state
information at the transmitter (CSIT) is a main obstacle in practice. In this
paper, novel transmission schemes are proposed for a class of interference
networks that can achieve new trade-off regions between the sum of degrees of
freedom (sum-DoF) and CSI feedback delay with distributed and
temperately-delayed CSIT. More specifically, a distributed space-time
interference alignment (STIA) scheme is proposed for the two-user
multiple-input multiple-output (MIMO) X channel via a novel precoding method
called Cyclic Zero-padding. The achieved sum-DoFs herein for certain antenna
configurations are greater than the best known sum-DoFs in literature with
delayed CSIT. Furthermore, we propose a distributed retrospective interference
alignment (RIA) scheme that achieves more than 1 sum-DoF for the K-user
single-input single-output (SISO) X network. Finally, we extend the distributed
STIA to the MxN user multiple-input single-output (MISO) X network where each
transmitter has N-1 antennas and each receiver has a single antenna, yielding
the same sum-DoF as that in the global and instantaneous CSIT case. The
discussion and the result of the MISO X network can be extended to the MIMO
case due to spatial scale invariance property.


title:
Odd length for even hyperoctahedral groups and signed generating
  functions

abstract:
  We define a new statistic on the even hyperoctahedral groups which is a
natural analogue of the odd length statistic recently defined and studied on
Coxeter groups of types $A$ and $B$. We compute the signed (by length)
generating function of this statistic over the whole group and over its maximal
and some other quotients and show that it always factors nicely. We also
present some conjectures.


title:
A $Herschel-SPIRE$ Survey of the Mon R2 Giant Molecular Cloud: Analysis
  of the Gas Column Density Probability Density Function

abstract:
  We present a far-IR survey of the entire Mon R2 GMC with $Herschel-SPIRE$
cross-calibrated with $Planck-HFI$ data. We fit the SEDs of each pixel with a
greybody function and an optimal beta value of 1.8. We find that mid-range
column densities obtained from far-IR dust emission and near-IR extinction are
consistent. For the entire GMC, we find that the column density histogram, or
N-PDF, is lognormal below $\sim$10$^{21}$ cm$^{-2}$. Above this value, the
distribution takes a power law form with an index of -2.16. We analyze the gas
geometry, N-PDF shape, and YSO content of a selection of subregions in the
cloud. We find no regions with pure lognormal N-PDFs. The regions with a
combination of lognormal and one power law N-PDF have a YSO cluster and a
corresponding centrally concentrated gas clump. The regions with a combination
of lognormal and two power law N-PDF have significant numbers of typically
younger YSOs but no prominent YSO cluster. These regions are composed of an
aggregate of closely spaced gas filaments with no concentrated dense gas clump.
We find that for our fixed scale regions, the YSO count roughly correlates with
the N-PDF power law index. The correlation appears steeper for single power law
regions relative to two power law regions with a high column density cut-off,
as a greater dense gas mass fraction is achieved in the former. A stronger
correlation is found between embedded YSO count and the dense gas mass among
our regions.


title: Mathematical Modeling of General Inaccurate Adders

abstract:
  Inaccurate circuits make possible the conservation of limited resources, such
as energy. But effective design of such circuits requires an understanding of
resulting tradeoffs between accuracy and design parameters, such as voltages
and speed of execution. Although studies of tradeoffs have been done on
specific circuits, the applicability of those studies is narrow. This paper
presents a comprehensive and mathematically rigorous method for analyzing a
large class of inaccurate circuits for addition. Furthermore, it presents new,
fast algorithms for the computation of key statistical measures of inaccuracy
in such adders, thus helping hardware architects explore the design space with
greater confidence.


title:
A Graph Partitioning Algorithm for Leak Detection in Water Distribution
  Networks

abstract:
  Leak detection in urban water distribution networks (WDNs) is challenging
given their scale, complexity, and limited instrumentation. We present an
algorithm for leak detection in WDNs, which involves making additional flow
measurements on-demand, and repeated use of water balance. Graph partitioning
is used to determine the location of flow measurements, with the objective to
minimize the measurement cost. We follow a multi-stage divide and conquer
approach. In every stage, a section of the WDN identified to contain the leak
is partitioned into two or more sub-networks, and water balance is used to
trace the leak to one of these sub-networks. This process is recursively
continued until the desired resolution is achieved. We investigate different
methods for solving the arising graph partitioning problem like integer linear
programming (ILP) and spectral bisection. The proposed methods are tested on
large scale benchmark networks, and our results indicate that on average, less
than 3% of the pipes need to be measured for finding the leak in large
networks.


title: Quantum simulations with circuit quantum electrodynamics

abstract:
  Superconducting circuits have become a leading quantum technology for testing
fundamentals of quantum mechanics and for the implementation of advanced
quantum information protocols. In this chapter, we revise the basic concepts of
circuit network theory and circuit quantum electrodynamics for the sake of
digital and analog quantum simulations of quantum field theories, relativistic
quantum mechanics, and many-body physics, involving fermions and bosons. Based
on recent improvements in scalability, controllability, and measurement,
superconducting circuits can be considered as a promising quantum platform for
building scalable digital and analog quantum simulators, enjoying unique and
distinctive properties when compared to other advanced platforms as trapped
ions, quantum photonics and optical lattices.


title: Rotor-Router Walk on a Semi-infinite Cylinder

abstract:
  We study the rotor-router walk with the clockwise ordering of outgoing edges
on the semi-infinite cylinder. Imposing uniform conditions on the boundary of
the cylinder, we consider growth of the cluster of visited sites and its
internal structure. The average width of the surface region of the cluster
evolves with time to the stationary value by a scaling law whose parameters are
close to the standard KPZ exponents. We introduce characteristic labels
corresponding to closed clockwise contours formed by rotors and show that the
sequence of labels has in average an ordered helix structure.


title:
VLBA determination of the distance to nearby star-forming regions VII.
  Monoceros R2

abstract:
  We present a series of sixteen Very Long Baseline Array (VLBA) high angular
resolution observations of a cluster of suspected low-mass young stars in the
Monoceros R2 region. Four compact and highly variable radio sources are
detected; three of them in only one epoch, the fourth one a total of seven
times. This latter source is seen in the direction to the previously known
\UCHII\ region VLA~1, and has radio properties that resemble those of
magnetically active stars; we shall call it VLA~1$^\star$. We model its
displacement on the celestial sphere as a combination of proper motion and
trigonometric parallax. The fit obtained using a uniform proper motion yields a
parallax $\varpi$ = 1.10 $\pm$ 0.18 mas, but with a fairly high post-fit
dispersion. If acceleration terms (probably due to an undetected companion) are
included, the quality of the fit improves dramatically, and the best estimate
of the parallax becomes $\varpi$ = 1.12 $\pm$ 0.05 mas. The magnitude of the
fitted acceleration suggest an orbital period of order a decade. The measured
parallax corresponds to a distance $d$ = 893$^{+44}_{-40}$ pc, in very good
agreement with previous, indirect, determinations.


title:
Hopeful windows and fractals in cellular automata and combinatorial
  games

abstract:
  This paper studies 2-player impartial combinatorial games, where the outcomes
correspond to updates of cellular automata (CA) which generalize Wolfram's
elementary rule 60 and rule 110 (Cook 2004). The games extend the class of
\emph{triangle placing games} (Larsson 2013) where at each stage of the game
the previous player has the option to block certain hopeful moves of the next
player. We also study fractals and partial convergence in a subclass of the CA.


title:
Performance Analysis of $L$-Branch Scan-and-Wait Combining (SWC) over
  Arbitrarily Correlated Nakagami-$m$ Fading Channels

abstract:
  The performance of $L$-branch scan-and-wait combining (SWC) reception systems
over arbitrarily correlated and not necessarily identically distributed
Nakagami-$m$ fading channels is analyzed and evaluated. Firstly, a fast
convergent infinite series representation for the SWC output signal-noise ratio
(SNR) is presented. This expression is used to obtain analytical expressions in
the form of infinite series for the average error probability performance of
various modulation schemes for integer values of $m$ as well as the average
number of paths estimation and average waiting time (AWT) of $L$-branch SWC
receivers for arbitrary values of $m$. The numerically obtained results have
shown that the performance expressions converge very fast to their exact
analytical values. It was found that the convergence speed depends on the
correlation and operating SNR values as well as the Nakagami $m$-parameter. In
addition to the analytical results, complementary computer simulated
performance evaluation results have been obtained by means of Monte Carlo error
counting techniques. The match between these two sets of results has verified
the accuracy of the proposed mathematical analysis. Furthermore, it is revealed
that, at the expense of a negligible AWT, the average error probability
performance of SWC receivers is always superior to that of switched-and-examine
combining receivers and in certain cases to that of maximal-ratio combining
receivers.


title: Comparison of analytic and numerical bond-order potentials for W and Mo

abstract:
  Bond-order potentials (BOPs) are derived from the tight-binding (TB)
approximation and provide a linearly-scaling computation of the energy and
forces for a system of interacting atoms. While the numerical BOPs involve the
numerical integration of the response (Green's) function, the expressions for
the energy and interatomic forces are analytical within the formalism of the
analytic BOPs. In this paper we present a detailed comparison of numerical and
analytic BOPs. We use established parametrisations for the bcc refractory
metals W and Mo and test structural energy differences; tetragonal, trigonal,
hexagonal and orthorhombic deformation paths; formation energies of point
defects as well as phonon dispersion relations. We find that the numerical and
analytic BOPs generally are in very good agreement for the calculation of
energies. Different from the numerical BOPs, the forces in the analytic BOPs
correspond exactly to the negative gradients of the energy. This makes it
possible to use the analytic BOPs in dynamical simulations and leads to
improved predictions of defect energies and phonons as compared to the
numerical BOPs.


title:
A multi-resolution, multi-epoch low radio frequency survey of the Kepler
  K2 mission Campaign 1 field

abstract:
  We present the first dedicated radio continuum survey of a Kepler K2 mission
field, Field 1 covering the North Galactic Cap. The survey is wide field,
contemporaneous, multi-epoch, and multi-resolution in nature and was conducted
at low radio frequencies between 140 and 200 MHz. The multi-epoch and ultra
wide field (but relatively low resolution) part of the survey was provided by
15 nights of observation with the Murchison Widefield Array (MWA) over a period
of approximately a month, contemporaneous with K2 observations of the field.
The multi-resolution aspect of the survey was provided by the low resolution
(4') MWA imaging, complemented by non-contemporaneous but much higher
resolution (20") observations using the Giant Metrewave Radio Telescope (GMRT).
The survey is therefore sensitive to the details of radio structures across a
wide range of angular scales. Consistent with other recent low radio frequency
surveys, no significant radio transients or variables were detected in the
survey. The resulting source catalogs consist of 1,085 and 1,468 detections in
the two MWA observation bands (centered at 154 and 185 MHz, respectively) and
7,445 detections in the GMRT observation band (centered at 148 MHz), over 314
square degrees. The survey is presented as a significant resource for
multi-wavelength investigations of the more than 21,000 target objects in the
K2 field. We briefly examine our survey data against K2 target lists for dwarf
star types (stellar types M and L) that have been known to produce radio
flares.


title:
A catalog of 1.5273 micron diffuse interstellar bands based on APOGEE
  hot telluric calibrators

abstract:
  High resolution stellar spectroscopic surveys provide massive amounts of
diffuse interstellar bands (DIBs) measurements. Data can be used to study the
distribution of the DIB carriers and those environmental conditions that favor
their formation. In parallel, recent studies have also proved that DIBs
extracted from stellar spectra constitute new tools for building the 3D
structure of the Galactic Interstellar Medium (ISM). The amount of details on
the structure depends directly on the quantity of available lines of sight
(LOS). Therefore there is a need to construct databases of high-quality DIB
measurements as large as possible. We aim at providing the community with a
catalog of high-quality measurements of the 1.5273 micron DIB towards a large
fraction of the Apache Point Observatory Galactic Evolution Experiment (APOGEE)
hot stars observed to correct for the telluric absorption and not used for ISM
studies so far. This catalog would complement the extensive database recently
extracted from the APOGEE observations and used for 3D ISM mapping. We devised
a method to fit the stellar continuum of the hot calibration stars and
extracted the DIB from the normalized spectrum. Severe selection criteria based
on the absorption characteristics are applied to the results. In particular
limiting constraints on the DIB widths and Doppler shifts are deduced from the
HI 21 cm measurements, following a new technique of decomposition of the
emission spectra. From ~16 000 available hot telluric spectra we have extracted
~ 6700 DIB measurements and their associated uncertainties. The statistical
properties of the extracted absorptions are examined and our selection criteria
are shown to provide a robust dataset. The resulting catalog contains the DIB
total equivalent widths, central wavelengths and widths. We briefly illustrate
its potential use for the stellar and interstellar communities.


title:
A Constructive Proof of Cut Elimination for a System of Full Second
  Order Logic

abstract:
  In this paper we present a constructive proof of cut elimination for a system
of full second order logic with the structural rules absorbed and using sets
instead of sequences. The standard problem of the cutrank growth is avoided by
using a new parameter for the induction, the cutweight. This technique can also
be applied to first order logic.


title:
Outside nested decompositions of skew diagrams and Schur function
  determinants

abstract:
  In this paper we describe the thickened strips and the outside nested
decompositions of any skew shape $\lambda/\mu$. For any such decomposition
$\Phi=(\Theta_1,\Theta_2,\ldots,\Theta_g)$ of the skew shape $\lambda/\mu$
where $\Theta_i$ is a thickened strip for every $i$, if $r$ is the number of
boxes that are contained in any two distinct thickened strips of $\Phi$, we
establish a determinantal formula of the function
$s_{\lambda/\mu}(X)p_{1^r}(X)$ with the Schur functions of thickened strips as
entries, where $s_{\lambda/\mu}(X)$ is the Schur function of the skew shape
$\lambda/\mu$ and $p_{1^r}(X)$ is the power sum symmetric function index by the
partition $(1^r)$. This generalizes Hamel and Goulden's theorem on the outside
decompositions of the skew shape $\lambda/\mu$. As an application of our
theorem, we derive the number of $m$-strip tableaux which was first counted by
Baryshnikov and Romik via extending the transfer operator approach due to
Elkies.


title: Entropy of $C^1$ diffeomorphisms without a dominated splitting

abstract:
  A classical construction due to Newhouse creates horseshoes from hyperbolic
periodic orbits with large period and weak domination through local
$C^1$-perturbations. Our main theorem shows that, when one works in the $C^1$
topology, the entropy of such horseshoes can be made arbitrarily close to an
upper bound deriving from Ruelle's inequality, i.e., the sum of the positive
Lyapunov exponents (or the same for the inverse diffeomorphism, whichever is
smaller). Adapting classical techniques, we use perturbations that are local
and can be chosen to preserve volume or symplectic form or a homoclinic
connection.
  This optimal entropy creation yields a number of consequences for
$C^1$-generic diffeomorphisms, especially in the absence of a dominated
splitting. For instance, in the conservative settings, we find formulas for the
topological entropy, deduce that the topological entropy is continuous but not
locally constant at the generic diffeomorphism and we prove that these generic
diffeomorphisms have no measure of maximum entropy. In the dissipative setting,
we show the locally generic existence of infinitely many homoclinic classes
with entropy bounded away from zero.


title: Symmetric and skew-symmetric block-Kronecker linearizations

abstract:
  Many applications give rise to structured matrix polynomials. The problem of
constructing structure-preserving strong linearizations of structured matrix
polynomials is revisited in this work and in the forthcoming ones
\cite{PartII,PartIII}. With the purpose of providing a much simpler framework
for structure-preserving linearizations for symmetric and skew-symmetric matrix
polynomial than the one based on Fiedler pencils with repetition, we introduce
in this work the families of (modified) symmetric and skew-symmetric block
Kronecker pencils. These families provide a large arena of structure-preserving
strong linearizations of symmetric and skew-symmetric matrix polynomials. When
the matrix polynomial has degree odd, these linearizations are strong
regardless of whether the matrix polynomial is regular or singular, and many of
them give rise to structure-preserving companion forms. When some generic
nonsingularity conditions are satisfied, they are also strong linearizations
for even-degree regular matrix polynomials. Many examples of
structure-preserving linearizations obtained from Fiedler pencils with
repetitions found in the literature are shown to belong (modulo permutations)
to these families of linearizations. In particular, this is shown to be true
for the well-known block-tridiagonal symmetric and skew-symmetric companion
forms. Since the families of symmetric and skew-symmetric block Kronecker
pencils belong to the recently introduced set of minimal bases pencils
\cite{Fiedler-like}, they inherit all its desirable properties for numerical
applications. In particular, it is shown that eigenvectors, minimal indices,
and minimal bases of matrix polynomials are easily recovered from those of any
of the linearizations constructed in this work.


title: Weak invariants of time-dependent quantum dissipative systems

abstract:
  The concept of weak invariant is introduced. Then, the weak invariants
associated with time-dependent quantum dissipative systems are discussed in the
context of master equations of the Lindblad type. In particular, with the help
of the su(1,1) Lie-algebraic structure, the weak invariant is explicitly
constructed for the quantum damped harmonic oscillator with the time-dependent
frequency and friction coefficient. This generalizes the Lewis-Riesenfeld
invariant to the case of nonunitary dynamics in the Markovian approximation.


title:
Classical - Quantum Arbitrarily Varying Wiretap Channel: Common
  Randomness Assisted Code and Continuity

abstract:
  We determine the secrecy capacities under common randomness assisted coding
of arbitrarily varying classical-quantum wiretap channels.Furthermore, we
determine the secrecy capacity of a mixed channel model which is compound from
the sender to the legal receiver and varies arbitrarily from the sender to the
eavesdropper. As an application we examine when the secrecy capacity is a
continuous function of the system parameters and show that resources, i.e.,
having access to a perfect copy of the outcome of a random experiment. are
helpful for channel stability.


title:
Inspiral waveforms for spinning compact binaries in a new precessing
  convention

abstract:
  It is customary to use a precessing convention, based on Newtonian orbital
angular momentum ${\bf L}_{\rm N}$, to model inspiral gravitational waves from
generic spinning compact binaries. A key feature of such a precessing
convention is its ability to remove all spin precession induced modulations
from the orbital phase evolution. However, this convention usually employs a
post-Newtonian (PN) accurate precessional equation, appropriate for the PN
accurate orbital angular momentum ${\bf L}$, to evolve the ${\bf L}_{\rm
N}$-based precessing source frame. This motivated us to develop inspiral
waveforms for spinning compact binaries in a precessing convention that
explicitly use ${\bf L}$ to describe the binary orbits. Our approach introduces
certain additional 3PN order terms in the orbital phase and frequency evolution
equations with respect to the usual ${\bf L}_{\rm N}$-based implementation of
the precessing convention. The implications of these additional terms are
explored by computing the match between inspiral waveforms that employ ${\bf
L}$ and ${\bf L}_{\rm N}$-based precessing conventions. We found that the match
estimates are smaller than the optimal value, namely 0.97, for a non-negligible
fraction of unequal mass spinning compact binaries.


title: Light-Cone Fluctuations in the Cosmic String Spacetime

abstract:
  In this paper we consider light-cone fluctuations arising as a consequence of
the nontrivial topology of the locally flat cosmic string spacetime. By setting
the light-cone along the z-direction we are able to develop a full analysis to
calculate the renormalized graviton two-point function, as well as the mean
square fluctuation in the geodesic interval function and the time delay (or
advance) in the propagation of a light-pulse. We found that all these
expressions depend upon the parameter characterizing the conical topology of
the cosmic string spacetime and vanish in the absence of it. We also point out
that at large distances from the cosmic string the mean square fluctuation in
the geodesic interval function is extremely small while in the opposite limit
it logarithmically increases, improving the signal and thus, making possible
the detection of such quantity.


title: The Picard Rank of an Enriques Surface

abstract:
  In this note, we use crystalline methods and the Tate-conjecture to give a
short proof that the Picard rank of an Enriques surface is equal to its second
Betti number.


title:
$\gamma_{5}$ algebra ambiguities in Feynman amplitudes: momentum routing
  invariance and anomalies in $D=4$ and $D=2$

abstract:
  We address the subject of chiral anomalies in two and four dimensional
theories. Ambiguities associated with the $\gamma_5$ algebra within divergent
integrals are identified, even though the physical dimension is not altered in
the process of regularization. We present a minimal prescription that leads to
unique results and apply it to a series of examples. For the particular case of
abelian theories with effective chiral vertices, we show: 1- Its implication on
the way to display the anomalies democratically in the Ward identities. 2- The
possibility to fix an arbitrary surface term in such a way that a momentum
routing independent result emerges. This leads to a reinterpretation of the
role of momentum routing in the process of choosing the Ward identity to be
satisfied in an anomalous process. 3- Momentum Routing Invariance (MRI) is a
necessary and sufficient condition to assure vectorial gauge invariance of
effective chiral Abelian gauge theories. We also briefly discuss the case of
complete chiral theories, using the Chiral Schwinger Model as an example.


title: Drag of electrons in graphene by substrate surface polar phonons

abstract:
  It is known that electron scattering by surface polar phonons (SPPs) of the
substrate reduces their mobility in supported graphene. However, there is no
experimental evidence for contribution of drag of electrons by SPP to
thermoelectric phenomena in graphene: graphene thermopower exhibits good
agreement with Mott's law, which means that the diffusion contribution to the
thermopower is dominant in a wide range of carrier densities and temperatures.
Here we develop a complete theory of drag of electrons in graphene by SPP. By
solving Boltzmann transport equation for electrons scattered by SPPs we derive
SPP drag contribution to the thermopower in graphene. Compared to diffusion
thermopower, obtained values appear to be one order of magnitude lower for
various substrates. This can be explained by low occupation number of the SPPs
and short mean free path of such phonons stemming from their small group
velocity. We conclude that experiments on thermopower in graphene can be
treated within the framework of Mott's law.


title: Variability in the Near-Infrared Synchrotron Emission From Cassiopeia A

abstract:
  We present multi-epoch Ks band imaging of the supernova remnant Cassiopeia A
(Cas A). The morphology of the emission in this band is generally diffuse and
filamentary, consistent with synchrotron radiation observed at radio
wavelengths. However, in one region to the southwest of the remnant, compact
knots of emission appear to be entrained in the ejecta and have the same proper
motion as ejecta observed at similar projected radii. The presence of these
knots suggests that material with high magnetic field strength contributes
significantly to synchrotron emission at these wavelengths. We analyze these
knots at J, H, and Ks bands as well as in 3.5-8 micron emission and at 6 cm
where synchrotron emission is dominant and we find that the Ks band emission
falls along the expected synchrotron spectrum. Using multi-epoch data, we
calculate the magnetic field strength and electron density for a population of
near-infrared synchrotron-emitting electrons. We find electron densities from
1,000-15,000 cm$^{-3}$ and magnetic field strengths from 1.3-5.8 mG. These
magnetic field strengths are an order of magnitude higher than inferred from
the much lower angular resolution gamma-ray observations toward Cas A. We
conclude that dense knots of post-shock material behind the Cas A shock front
are emitting synchrotron emission in a compressed and enhanced magnetic field.


title: Modeling the RV jitter of early M dwarfs using tomographic imaging

abstract:
  In this paper we show how tomographic imaging (Zeeman Doppler Imaging, ZDI)
can be used to characterize stellar activity and magnetic field topologies,
ultimately allowing to filter out the radial velocity (RV) activity jitter of
M-dwarf moderate rotators. This work is based on spectropolarimetric
observations of a sample of five weakly-active early M-dwarfs (GJ 205, GJ 358,
GJ 410, GJ479, GJ 846) with HARPS-Pol and NARVAL. These stars have v sin i and
RV jitters in the range 1-2 km/s and 2.7-10.0 m/s rms respectively. Using a
modified version of ZDI applied to sets of phase-resolved Least-Squares- Decon-
volved (LSD) profiles of unpolarized spectral lines, we are able to
characterize the distribution of active regions at the stellar surfaces. We
find that darks spots cover less than 2% of the total surface of the stars of
our sample. Our technique is e cient at modeling the rotationally mod- ulated
component of the activity jitter, and succeeds at decreasing the amplitude of
this com- ponent by typical factors of 2-3 and up to 6 in optimal cases. From
the rotationally modulated time-series of circularly polarized spectra and with
ZDI, we also reconstruct the large-scale magnetic field topology. These fields
suggest that bi-stability of dynamo processes observed in active M dwarfs may
also be at work for moderately active M dwarfs. Comparing spot distributions
with field topologies suggest that dark spots causing activity jitter
concentrate at the magnetic pole and/or equator, to be confirmed with future
data on a larger sample.


title: Topological realizations of line arrangements

abstract:
  A venerable problem in combinatorics and geometry asks whether a given
incidence relation may be realized by a configuration of points and lines. The
classic version of this would ask for algebraic lines over some field or
possibly real pseudolines: embedded circles (isotopic to $RP^1$) in the real
projective plane. In this paper we investigate whether a configuration is
realized by a collection of $2$-spheres embedded, in the symplectic, smooth, or
topological (locally flat) categories, in the complex projective plane. We find
obstructions to realizability in the topological category, which apply to
configurations specified by all projective planes over a finite field. Such
obstructions are used to show that certain contact graph manifolds are not
(strongly) symplectically fillable. We also show that a configuration of real
pseudolines can be complexified to give a configuration of smooth, indeed
symplectically embedded, $2$-spheres.


title:
The panchromatic spectroscopic evolution of the classical CO nova V339
  Del (Nova Del 2013) until X-ray turnoff

abstract:
  Classical novae are the product of thermonuclear runaway-initiated explosions
occurring on accreting white dwarfs. V339 Del (Nova Delphinus 2013) was one of
the brightest classical novae of the last hundred years. Spectroscopy and
photometry are available from $\gamma$-rays through infrared at stages that
have frequently not been well observed. The complete data set is intended to
provide a benchmark for comparison with modeling and for understanding more
sparsely monitored historical classical and recurrent novae. This paper is the
first in the series of reports on the development of the nova. We report here
on the early stages of the outburst, through the X-ray active stage. A time
sequence of optical, flux calibrated high resolution spectra was obtained with
the Nordic Optical Telescope (NOT) using FIES simultaneously, or
contemporaneously, with the Space Telescope Imaging Spectrograph (STIS) aboard
the Hubble Space Telescope during the early stages of the outburst. These were
supplemented with MERCATOR/HERMES optical spectra. High resolution IUE
ultraviolet spectra of OS And 1986, taken during the Fe curtain phase, served
as a template for the distance determination. We used standard plasma
diagnostics (e.g., [O III] and [N II] line ratios, and the H$\beta$ line flux)
to constrain electron densities and temperatures of the ejecta. Using Monte
Carlo modeling of the ejecta, we derived the structure, filling factor, and
mass from comparisons of the optical and ultraviolet line profiles.


title:
Ax-Schanuel type theorems and geometry of strongly minimal sets in
  differentially closed fields

abstract:
  Let $(K;+,\cdot, ', 0, 1)$ be a differentially closed field. In this paper we
explore the connection between Ax-Schanuel type theorems (predimension
inequalities) for a differential equation $E(x,y)$ and the geometry of the set
$U:=\{ y:E(t,y) \wedge y' \neq 0 \}$ where $t$ is an element with $t'=1$. We
show that certain types of predimension inequalities imply strong minimality
and geometric triviality of $U$. Moreover, the induced structure on Cartesian
powers of $U$ is given by special subvarieties. If $E$ has some special form
then all fibres $U_s:=\{ y:E(s,y) \wedge y' \neq 0 \}$ (with $s$ non-constant)
have the same properties. In particular, since the $j$-function satisfies an
Ax-Schanuel theorem of the required form (due to Pila and Tsimerman), our
results will give another proof for a theorem of Freitag and Scanlon stating
that the differential equation of $j$ defines a strongly minimal set with
trivial geometry (which is not $\aleph_0$-categorical though).


title:
Exploring the cosmological consequences of JLA supernova data with
  improved flux-averaging technique

abstract:
  In this work, we explore the cosmological consequences of the "Joint
Light-curve Analysis" (JLA) supernova (SN) data by using an improved
flux-averaging (FA) technique, in which only the type Ia supernovae (SNe Ia) at
high redshift are flux-averaged. Adopting the criterion of figure of Merit
(FoM) and considering six dark energy (DE) parameterizations, we search the
best FA recipe that gives the tightest DE constraints in the $(z_{cut}, \Delta
z)$ plane, where $z_{cut}$ and $\Delta z$ are redshift cut-off and redshift
interval of FA, respectively. Then, based on the best FA recipe obtained, we
discuss the impacts of varying $z_{cut}$ and varying $\Delta z$, revisit the
evolution of SN color luminosity parameter $\beta$, and study the effects of
adopting different FA recipe on parameter estimation. We find that: (1) The
best FA recipe is $(z_{cut} = 0.6, \Delta z=0.06)$, which is insensitive to a
specific DE parameterization. (2) Flux-averaging JLA samples at $z_{cut} \geq
0.4$ will yield tighter DE constraints than the case without using FA. (3)
Using FA can significantly reduce the redshift-evolution of $\beta$. (4) The
best FA recipe favors a larger fractional matter density $\Omega_{m}$. In
summary, we present an alternative method of dealing with JLA data, which can
reduce the systematic uncertainties of SNe Ia and give the tighter DE
constraints at the same time. Our method will be useful in the use of SNe Ia
data for precision cosmology.


title: Little Earth Experiment: an instrument to model planetary cores

abstract:
  In this paper, we present a new experimental facility, Little Earth
Experiment, designed to study the hydrodynamics of liquid planetary cores. The
main novelty of this apparatus is that a transparent electrically conducting
electrolyte is subject to extremely high magnetic fields (up to 10T) to produce
electromagnetic effects comparable to those produced by moderate magnetic
fields in planetary cores. This technique makes it possible to visualise for
the first time the coupling between the principal forces in a convection-driven
dynamo by means of Particle Image Velocimetry (PIV) in a geometry relevant to
planets. We first present the technology that enables us to generate these
forces and implement PIV in a high magnetic field environment. We then show
that the magnetic field drastically changes the structure of convective plumes
in a configuration relevant to the tangent cylinder region of the Earth's core.