title:
MUIT: A Middleware for Adaptive Mobile Web-based User Interfaces in
  WS-BPEL

abstract:
  In enterprise organizations, the Bring-Your-Own-Device (BYOD) requirement has
become prevalent as employees use their own mobile devices to process the
workflow-oriented tasks. Consequently, it calls for approaches that can quickly
develop and integrate mobile user interactions into existing business
processes, and adapt to various contexts. However, designing, developing and
deploying adaptive and mobile-oriented user interfaces for existing process
engines are non-trivial, and require significant systematic efforts. To address
this issue, we present a novel middleware-based approach, called MUIT, to
developing and deploying the Mobility, User Interactions and Tasks into WS-BPEL
engines. MUIT can be seamlessly into WS-BPEL without intrusions of existing
process instances. MUIT provides a Domain-Specific Language (DSL) that provides
some intuitive APIs to support the declarative development of adaptive,
mobile-oriented, and Web-based user interfaces in WS-BPEL. The DSL can
significantly improve the development of user interactions by preventing
arbitrarily mixed codes, and its runtime supports satisfactory user
experiences. We implement a proof- of-concept prototype by integrating MUIT
into the commodity WS-BPEL-based Apusic Platform, and evaluate the performance
and usability of MUIT platform.


title: Phi meson spectral moments and QCD condensates in nuclear matter

abstract:
  A detailed analysis of the lowest two moments of the $\phi$ meson spectral
function in vacuum and nuclear matter is performed. The consistency is examined
between the constraints derived from finite energy QCD sum rules and the
spectra computed within an improved vector dominance model, incorporating the
coupling of kanonic degrees of freedom with the bare $\phi$ meson. In the
vacuum, recent accurate measurements of the $e^+ e^- \to K^+ K^-$ cross section
allow us to determine the spectral function with high precision. In nuclear
matter, the modification of the spectral function can be described by the
interactions of the kaons from $\phi \rightarrow K\bar{K}$ with the surrounding
nuclear medium. This leads primarily to a strong broadening and an asymmetric
deformation of the $\phi$ meson peak structure. We confirm that, both in vacuum
and nuclear matter, the zeroth and first moments of the corresponding spectral
functions satisfy the requirements of the finite energy sum rules to a
remarkable degree of accuracy. Limits on the strangeness sigma term of the
nucleon are examined in this context. Applying our results to the second moment
of the spectrum, we furthermore discuss constraints on four-quark condensates
and the validity of the commonly used ground state saturation approximation.


title: Edge-Stable Equimatchable Graphs

abstract:
  A graph $G$ is \emph{equimatchable} if every maximal matching of $G$ has the
same cardinality. We are interested in equimatchable graphs such that the
removal of any edge from the graph preserves the equimatchability. We call an
equimatchable graph $G$ \emph{edge-stable} if $G\setminus {e}$, that is the
graph obtained by the removal of edge $e$ from $G$, is also equimatchable for
any $e \in E(G)$. After noticing that edge-stable equimatchable graphs are
either 2-connected factor-critical or bipartite, we characterize edge-stable
equimatchable graphs. This characterization yields an $O(\min(n^{3.376},
n^{1.5}m))$ time recognition algorithm. Lastly, we introduce and shortly
discuss the related notions of edge-critical, vertex-stable and vertex-critical
equimatchable graphs. In particular, we emphasize the links between our work
and the well-studied notion of shedding vertices, and point out some open
questions.


title: Adjusted Empirical Likelihood for Time Series Models

abstract:
  Empirical likelihood method has been applied to dependent observations by
Monti (1997) through the Whittle's estimation method. Similar asymptotic
distribution of the empirical likelihood ratio statistic for stationary time
series has been derived to construct the confidence regions for the parameters.
However, required numerical problem of computing profile empirical likelihood
function which involves constrained maximization has no solution sometimes,
which leads to the drawbacks of using the original version of the empirical
likelihood ratio. In this paper, we propose an adjusted empirical likelihood
ratio statistic to modify the one proposed by Monti so that it guarantees the
existence of the solution of the required maximization problem, while
maintaining the similar asymptotic properties as Monti obtained. Simulations
have been conducted to illustrate the coverage probabilities obtained by the
adjusted version for different time series models which are better than the
ones obtained by Monti's version, especially for small sample sizes.


title: Double occupancy in DMFT and the Dual Boson approach

abstract:
  We discuss the calculation of the double occupancy using Dynamical Mean-Field
Theory (DMFT) in finite dimensions. The double occupancy can be determined from
the susceptibility of the auxiliary impurity model or from the lattice
susceptibility. The former method underestimates, whereas the latter
overestimates the double occupancy. We illustrate this for the square-lattice
Hubbard model. We propose an approach for which both methods lead to identical
results by construction and which resolves this ambiguity. This self-consistent
dual boson scheme results in a double occupancy that is numerically close to
benchmarks available in the literature.


title:
Modular Tracking Framework: A Unified Approach to Registration based
  Tracking

abstract:
  This paper presents a modular, extensible and highly efficient open source
framework for registration based tracking called Modular Tracking Framework
(MTF). Targeted at robotics applications, it is implemented entirely in C++ and
designed from the ground up to easily integrate with systems that support any
of several major vision and robotics libraries including OpenCV, ROS, ViSP and
Eigen. It implements more methods, is faster, and more precise than other
existing systems. Further, the theoretical basis for its design is a new way to
conceptualize registration based trackers that decomposes them into three
constituent sub modules - Search Method (SM), Appearance Model (AM) and State
Space Model (SSM).
  In the process, we integrate many important advances published after Baker \&
Matthews' landmark work in 2004. In addition to being a practical solution for
fast and high precision tracking, MTF can also serve as a useful research tool
by allowing existing and new methods for any of the sub modules to be studied
better. When a new method is introduced for one of these, the breakdown can
help to experimentally find the combination of methods for the others that is
optimum for it. By extensive use of generic programming, MTF makes it easy to
plug in a new method for any of the sub modules so that it can not only be
tested comprehensively with existing methods but also become immediately
available for deployment in any project that uses the framework. With 16 AMs,
11 SMs and 13 SSMs implemented already, MTF provides over 2000 distinct single
layer trackers. It also allows two or more of these to be combined together in
several ways to create a practically unlimited variety of novel multi layer
trackers.


title:
Mid-infrared interferometry of Seyfert galaxies: Challenging the
  Standard Model

abstract:
  Aims: We aim to find torus models that explain the observed high-resolution
mid-infrared (MIR) measurements of active galactic nuclei (AGN). Our goal is to
determine the general properties of the circumnuclear dusty environments.
  Methods: We used the MIR interferometric data of a sample of AGNs provided by
the instrument MIDI/VLTI and followed a statistical approach to compare the
observed distribution of the interferometric data with the distributions
computed from clumpy torus models. We mainly tested whether the diversity of
Seyfert galaxies can be described using the Standard Model idea. In addition to
line-of-sight (LOS) effects, we performed different realizations of the same
model to include possible variations that are caused by the stochastic nature
of the dusty models.
  Results: We find that our entire sample of AGNs, which contains both Seyfert
types, cannot be explained merely by an inclination effect and by including
random variations of the clouds. Instead, we find that each subset of Seyfert
type can be explained by different models, where the filling factor at the
inner radius seems to be the largest difference. For type I objects we find
that about two thirds of our objects could also be described using a dusty
torus similar to the type II objects. For the remaining third, it was not
possible to find a good description using models with high filling factors,
while we found good fits with models with low filling factors.
  Conclusions: Within our model assumptions, we did not find one single set of
model parameters that could simultaneously explain the MIR data of all 21 AGN
with LOS effects and random variations alone. We conclude that at least two
distinct cloud configurations are required to model the differences in Seyfert
galaxies, with volume-filling factors differing by a factor of about 5-10. A
continuous transition between the two types cannot be excluded.


title:
Continuous Analogues for the Binomial Coefficients and the Catalan
  Numbers

abstract:
  Using techniques from the theories of convex polytopes, lattice paths, and
indirect influences on directed manifolds, we construct continuous analogues
for the binomial coefficients and the Catalan numbers. Our approach for
constructing these analogues can be applied to a wide variety of combinatorial
sequences. As an application we develop a continuous analogue for the binomial
distribution.


title: Experimental temporal quantum steering

abstract:
  Temporal steering is a form of temporal correlation between the initial and
final state of a quantum system. It is a temporal analogue of the famous
Einstein-Podolsky-Rosen (spatial) steering. We demonstrate, by measuring the
photon polarization, that temporal steering allows two parties to verify if
they have been interacting with the same particle, even if they have no
information about what happened with the particle in between the measurements.
This is the first experimental study of temporal steering. We also performed
experimental tests, based on the violation of temporal steering inequalities,
of the security of two quantum key distribution protocols against individual
attacks. Thus, these results can lead to applications for secure quantum
communications and quantum engineering.


title: The Capacity of Private Information Retrieval

abstract:
  In the private information retrieval (PIR) problem a user wishes to retrieve,
as efficiently as possible, one out of $K$ messages from $N$ non-communicating
databases (each holds all $K$ messages) while revealing nothing about the
identity of the desired message index to any individual database. The
information theoretic capacity of PIR is the maximum number of bits of desired
information that can be privately retrieved per bit of downloaded information.
For $K$ messages and $N$ databases, we show that the PIR capacity is
$(1+1/N+1/N^2+\cdots+1/N^{K-1})^{-1}$. A remarkable feature of the capacity
achieving scheme is that if we eliminate any subset of messages (by setting the
message symbols to zero), the resulting scheme also achieves the PIR capacity
for the remaining subset of messages.


title: Photon Mass Limits from Fast Radio Bursts

abstract:
  The frequency-dependent time delays in fast radio bursts (FRBs) can be used
to constrain the photon mass, if the FRB redshifts are known, but the
similarity between the frequency dependences of dispersion due to plasma
effects and a photon mass complicates the derivation of a limit on $m_\gamma$.
The dispersion measure (DM) of FRB 150418 is known to $\sim 0.1$%, and there is
a claim to have measured its redshift with an accuracy of $\sim 2$%, but the
strength of the constraint on $m_\gamma$ is limited by uncertainties in the
modelling of the host galaxy and the Milky Way, as well as possible
inhomogeneities in the intergalactic medium (IGM). Allowing for these
uncertainties, the recent data on FRB 150418 indicate that $m_\gamma \lesssim
1.8 \times 10^{-14}$eV c$^{-2}$ ($3.2 \times 10^{-50}$kg), if FRB 150418 indeed
has a redshift $z = 0.492$ as initially reported. In the future, the different
redshift dependences of the plasma and photon mass contributions to DM can be
used to improve the sensitivity to $m_\gamma$ if more FRB redshifts are
measured. For a fixed fractional uncertainty in the extra-galactic contribution
to the DM of an FRB, one with a lower redshift would provide greater
sensitivity to $m_\gamma$.


title: Residues for flags of holomorphic foliations

abstract:
  In this work we prove a Baum-Bott type residue theorem for flags of
holomorphic foliations. We prove some relations between the residues of the
flag and the residues of their correspondent foliations. We define the Nash
residue for flags and we give a partial answer to the Baum-Bott type
rationality conjecture in this context .


title:
Numerical Modeling of Orbit-Spin Coupling Accelerations in a Mars
  General Circulation Model: Implications for Global Dust Storm Activity

abstract:
  We employ the MarsWRF general circulation model (GCM) to test the predictions
of a new physical hypothesis: a weak coupling of the orbital and rotational
angular momenta of extended bodies is predicted to give rise to cycles of
intensification and relaxation of circulatory flows within atmospheres. The
dynamical core of the GCM has been modified to include the orbit-spin coupling
accelerations due to solar system dynamics for the years 1920-2030. The
modified GCM is first subjected to extensive testing and validation. We compare
forced and unforced model outcomes for large-scale zonal and meridional flows,
and for near-surface wind velocities and surface wind stresses. The predicted
cycles of circulatory intensification and relaxation within the modified GCM
are observed. Most remarkably, the modified GCM reproduces conditions favorable
for the occurrence of perihelion-season global-scale dust storms on Mars in
years in which such storms were observed. A strengthening of the meridional
overturning (Hadley) circulation during the dust storm season occurs in the GCM
in all previously known years with perihelion-season global-scale dust storms.
The increased upwelling produced in the southern hemisphere in southern summer
may facilitate the transport of dust to high altitudes in the Mars atmosphere
during the dust storm season, where radiative heating may further strengthen
the circulation. Significantly increased surface winds and surface wind
stresses are also obtained. These may locally facilitate saltation and dust
lifting from the surface. The numerical simulations constitute proof of concept
for the orbit-spin coupling hypothesis under evaluation.


title: Experimental overview on small collision systems at the LHC

abstract:
  These conferences proceedings summarize the experimental findings obtained in
small collision systems at the LHC, as presented in the special session on "QGP
in small systems?" at the Quark Matter 2015 conference. (The arXiv version is
significantly longer than the printed proceedings, with more details and a
short discussion.)


title:
On the real-rootedness of the Veronese construction for rational formal
  power series

abstract:
  We study real sequences $\{a_{n}\}_{n\in \mathbb{N}}$ that eventually agree
with a polynomial. We show that if the numerator polynomial of its rational
generating series is of degree $s$ and has only nonnegative coefficients, then
the numerator polynomial of the subsequence $\{ a_{rn+i}\}_{n\in \mathbb{N}}$,
$0\leq i<r$, has only nonpositive, real roots for all $r\geq s-i$. We apply our
results to combinatorially positive valuations on polytopes and to Hilbert
functions of Veronese submodules of graded Cohen-Macaulay algebras. In
particular, we prove that the Ehrhart $h^\ast$-polynomial of the $r$-th dilate
of a $d$-dimensional polytope has only distinct, negative, real roots if $r\geq
\min \{s+1,d\}$. This proves a conjecture of Beck and Stapledon (2010).


title:
Information Reconciliation for Continuous-Variable Quantum Key
  Distribution using Non-Binary Low-Density Parity-Check Codes

abstract:
  An information reconciliation method for continuous-variable quantum key
distribution with Gaussian modulation that is based on non-binary low-density
parity-check (LDPC) codes is presented. Sets of regular and irregular LDPC
codes with different code rates over the Galois fields $GF(8)$, $GF(16)$,
$GF(32)$, and $GF(64)$ have been constructed. We have performed simulations to
analyze the efficiency and the frame error rate using the sum-product
algorithm. The proposed method achieves an efficiency between $0.94$ and $0.98$
if the signal-to-noise ratio is between $4$ dB and $24$ dB.


title:
OGLE-ing the Magellanic System: Three-Dimensional Structure of the
  Clouds and the Bridge Using Classical Cepheids

abstract:
  We analyzed a sample of 9418 fundamental-mode and first-overtone Classical
Cepheids from the OGLE-IV Collection of Classical Cepheids. The distance to
each Cepheid was calculated using the period-luminosity relation for the
Wesenheit magnitude, fitted to our data.
  The classical Cepheids in the LMC are situated mainly in the bar and in the
northern arm. The eastern part of the LMC is closer to us and the plane fit to
the whole LMC sample yields the inclination $i=24.2\pm0.7$ deg and position
angle ${\rm P.A.}=151.4\pm1.7$ deg. We redefined the LMC bar by extending it in
the western direction and found no offset from the plane of the LMC contrary to
previous studies. On the other hand, we found that the northern arm is offset
from a plane by about $-0.5$ kpc, which was not observed before. The age
distribution of the LMC Cepheids shows one maximum at about 100 Myr.
  We demonstrate that the SMC has a non-planar structure and can be described
as an extended ellipsoid. We identified two large ellipsoidal off-axis
structures in the SMC. The northern one is located closer to us and is younger,
while the south-western is farther and older. The age distribution of the SMC
Cepheids is bimodal with one maximum at 110 Myr, and another one at 220 Myr.
Younger stars are located in the closer part of this galaxy while older ones
are more distant.
  We classified nine Cepheids from our sample as Magellanic Bridge objects.
These Cepheids show a large spread in three-dimensions although five of them
form a connection between the Clouds. The closest one is closer than any of the
LMC Cepheids, while the farthest one -- farther than any SMC Cepheid. All but
one Cepheids in the Magellanic Bridge are younger than 300 Myr. The oldest one
can be associated with the SMC Wing.


title: The MUSCLES Treasury Survey I: Motivation and Overview

abstract:
  Ground- and space-based planet searches employing radial velocity techniques
and transit photometry have detected thousands of planet-hosting stars in the
Milky Way. The chemistry of these atmospheres is controlled by the shape and
absolute flux of the stellar spectral energy distribution, however, flux
distributions of relatively inactive low-mass stars are poorly known at
present. To better understand exoplanets orbiting low-mass stars, we have
executed a panchromatic (X-ray to mid-IR) study of the spectral energy
distributions of 11 nearby planet hosting stars, the {\it Measurements of the
Ultraviolet Spectral Characteristics of Low-mass Exoplanetary Systems}
(MUSCLES) Treasury Survey. The MUSCLES program consists of contemporaneous
observations at X-ray, UV, and optical wavelengths. We show that energetic
radiation (X-ray and ultraviolet) is present from magnetically active stellar
atmospheres at all times for stars as late as M5. Emission line luminosities of
\ion{C}{4} and \ion{Mg}{2} are strongly correlated with band-integrated
luminosities. We find that while the slope of the spectral energy distribution,
FUV/NUV, increases by approximately two orders of magnitude form early K to
late M dwarfs ($\approx$~0.01~to~1), the absolute FUV and XUV flux levels at
their corresponding habitable zone distances are constant to within factors of
a few, spanning the range 10~--~70 erg cm$^{-2}$ s$^{-1}$ in the habitable
zone. Despite the lack of strong stellar activity indicators in their optical
spectra, several of the M dwarfs in our sample show spectacular flare emission
in their UV light curves. Finally, we interpret enhanced $L(line)$/$L_{Bol}$
ratios for \ion{C}{4} and \ion{N}{5} as tentative observational evidence for
the interaction of planets with large planetary mass-to-orbital distance ratios
($M_{plan}$/$a_{plan}$) with the transition regions of their host stars.


title: Towards a Systematic Development Process of Optimization Methods

abstract:
  The ultimate goal of all optimization methods is to solve real-world
problems. For a successful project execution, knowledge about optimization and
the application has to be pooled. As it is too inefficient to highly train one
person in both fields, a team of experts is usually put together.
Unfortunately, communication errors must be expected when several people
collaborate. In this work, we deal with the avoidance and the repair of these
communication errors. The tools proposed in this regard are, among others, the
algorithm engineering cycle, checklists for structuring communication, and
knowledge databases. The discussion is enriched with examples from continuous
optimization, but most tools have a much wider applicability, even beyond
optimization.


title: The Fourier structure of low degree polynomials

abstract:
  We study the structure of the Fourier coefficients of low degree multivariate
polynomials over finite fields. We consider three properties: (i) the number of
nonzero Fourier coefficients; (ii) the sum of the absolute value of the Fourier
coefficients; and (iii) the size of the linear subspace spanned by the nonzero
Fourier coefficients. For quadratic polynomials, tight relations are known
between all three quantities. In this work, we extend this relation to higher
degree polynomials. Specifically, for degree $d$ polynomials, we show that the
three quantities are equivalent up to factors exponential in $d$.


title: Comment on "Catalytic Coherence"

abstract:
  Aberg has claimed in a recent Letter," Phys. Rev. Lett. 113, 150402 (2014)",
that the coherence of a reservoir can be used repeatedly to perform coherent
operations without ever diminishing in power to do so. The claim has particular
relevance for quantum thermodynamics because, as shown in "Phys. Rev. Lett.
113, 150402 (2014)", latent energy that is locked by coherence may be
extractable without incurring any additional cost. We show here, however, that
repeated use of the reservoir gives an overall coherent operation of diminished
accuracy and is necessarily accompanied by an increased thermodynamic cost.


title: The ternary Goldbach problem with primes in positive density sets

abstract:
  Let $\mathcal{P}$ denote the set of all primes. $P_{1},P_{2},P_{3}$ are three
subsets of $\mathcal{P}$. Let $\underline{\delta}(P_{i})$ $(i=1,2,3)$ denote
the lower density of $P_{i}$ in $\mathcal{P}$, respectively. It is proved that
if $\underline{\delta}(P_{1})>5/8$, $\underline{\delta}(P_{2})\geq5/8$, and
$\underline{\delta}(P_{3})\geq5/8$, then for every sufficiently large odd
integer n, there exist $p_{i} \in P_{i}$ such that $n=p_{1}+p_{2}+p_{3}$. The
condition is the best possible.


title: CLIC Muon Sweeper Design

abstract:
  There are several background sources which may affect the analysis of data
and detector performans at the CLIC project. One of the important background
source is halo muons, which are generated along the beam delivery system (BDS),
for the detector performance. In order to reduce muon background, magnetized
muon sweepers have been used as a shielding material that is already described
in a previous study for CLIC [1]. The realistic muon sweeper has been designed
with OPERA. The design parameters of muon sweeper have also been used to
estimate muon background reduction with BDSIM Monte Carlo simulation code [2,
3].


title: Partitioning Hadamard vectors into Hadamard matrices

abstract:
  We will show that in a space of dimension $m$, any family of $2^{m-1}$
distinct Hadamard vectors (where you can choose x or -x but not both) can be
partitioned into Hadamard matrices if and only if $m=2^n$ for some n. We will
solve this problem with a simple algorithm for assigning the vectors to the
Hadamard matrices.


title:
Computational Complex Dynamics of $\displaystyle{f_{\alpha, \beta,
  \gamma, \delta}(z)=\frac{\alpha z + \beta}{\gamma z^2 +\delta z}}$

abstract:
  The dynamics of the family of maps $\displaystyle{f_{\alpha, \beta, \gamma,
\delta}(z)=\frac{\alpha z + \beta}{\gamma z^2 +\delta z}}$ in complex plane is
investigated computationally. This dynamical system $z_{n+1}=f_{\alpha, \beta,
\gamma, \delta}(z_n)=\frac{\alpha z_n + \beta}{\gamma z_n^2 +\delta z_n}$ has
periodic solutions with higher periods which was absent in the real line
scenario. It is also found that there are chaotic fractal and non-fractal like
solutions of the dynamical systems. A few special cases of parameters are also
have been taken care.


title:
Performance of new 8-inch photomultiplier tube used for the Tibet
  muon-detector array

abstract:
  A new hybrid experiment has been constructed to measure the chemical
composition of cosmic rays around the "knee" in the wide energy range by the
Tibet AS$\gamma$ collaboration at Tibet, China, since 2014. They consist of a
high-energy air-shower-core array (YAC-II), a high-density air-shower array
(Tibet-III) and a large underground water-Cherenkov muon-detector array (MD).
In order to obtain the primary proton, helium and iron spectra and their "knee"
positions in the energy range lower than $10^{16}$ eV, each of PMTs equipped to
the MD cell is required to measure the number of photons capable of covering a
wide dynamic range of 100 - $10^{6}$ photoelectrons (PEs) according to Monte
Carlo simulations. In this paper, we firstly compare the characteristic
features between R5912-PMT made by Japan Hamamatsu and CR365-PMT made by
Beijing Hamamatsu. This is the first comparison between R5912-PMT and
CR365-PMT. If there exists no serious difference, we will then add two
8-inch-in-diameter PMTs to meet our requirements in each MD cell, which are
responsible for the range of 100 - 10000 PEs and 2000 - 1000000 PEs,
respectively. That is, MD cell is expected to be able to measure the number of
muons over 6 orders of magnitude.


title: Recent status of FPCCD vertex detector R&D

abstract:
  The Fine Pixel CCD (FPCCD) is one of the candidate sensor technologies for
the ILC vertex detector. It will be located near interaction point and require
high radiation tolerance. It will thus be operated at -40 degree C to improve
radiation tolerance. In this paper, we report on the status of neutron
radiation tests, on a cooling system using two-phase CO2 with a gas compressor
for circulation, and on the mechanical structure of the FPCCD ladders.


title: Compact, CO2-stabilized tuneable laser at 2.05 microns

abstract:
  We demonstrate a compact fibre-based laser system at 2.05 microns stabilized
to a CO2 transition using frequency modulation spectroscopy of a gas-filled
hollow-core fibre. The laser exhibits an absolute frequency accuracy of 5 MHz,
a frequency stability noise floor of better than 7 kHz or 5e-11 and is tunable
within +/-200 MHz from the molecular resonance frequency while retaining
roughly this stability and accuracy.


title: Extremal Betti numbers of graded modules

abstract:
  Let $S$ be a polynomial ring in $n$ variables over a field $K$ of
characteristic $0$. A numerical characterization of all possible extremal Betti
numbers of any graded submodule of a finitely generated graded free $S$-module
is given.


title:
Explicit formulae for one-part double Hurwitz numbers with completed
  3-cycles

abstract:
  We prove two explicit formulae for one-part double Hurwitz numbers with
completed 3-cycles. We define "combinatorial Hodge integrals" from these
numbers in the spirit of the celebrated ELSV formula. The obtained results
imply some explicit formulae and properties of the combinatorial Hodge
integrals.


title: Improvement of photon reconstruction in PandoraPFA

abstract:
  This paper presents the overview of improving photon reconstruction in
PandoraPFA. We have reduced the fragmentation and improved the photon
separation resolution. As a result, the reconstructed photons have a greater
completeness and purity, and the jet energy resolution has improved for high
energy jets.


title:
Adams-Spanne type estimates for the commutators of fractional type
  sublinear operators in generalized Morrey spaces on Heisenberg groups

abstract:
  In this paper we give BMO (bounded mean oscillation) space estimates for
commutators of fractional type sublinear operators in generalized Morrey spaces
on Heisenberg groups. The boundedness conditions are also formulated in terms
of Zygmund type integral inequalities.


title: Fast Control Latency Uncertainty Elimination for the BESIII ETOF Upgrade

abstract:
  A new fanning topology is proposed to precisely fan out fast control signals
in the Beijing Spectrometer (BES III) end-cap time-of-flight (ETOF)
electronics. However, uncertainty in transfer latency is introduced by the new
fanning channel, which will degrade the precision of fast control. In this
paper, latency uncertainty elimination for the BESIII ETOF upgrade is
introduced. The latency uncertainty is determined by a Time-Digital-Converter
(TDC) embedded in a Field-Programmable Gate Array (FPGA) and is eliminated by
re-capturing at synchronous and determinate time. Compared with the existing
method of Barrel-cap TOF (BTOF), it has advantages of flexible structure, easy
calibration and good adaptability. Field tests on the BES III ETOF system show
that this method effectively eliminates transfer latency uncertainty.


title: SiPM Gain Stabilization Studies for Adaptive Power Supply

abstract:
  We present herein gain stabilization studies of SiPMs using a climate chamber
at CERN. We present results for four detectors not tested before, three from
Hamamatsu and one from KETEK. Two of the Hamamatsu SiPMs are novel sensors with
trenches that reduce cross talk. We use an improved readout system with a
digital oscilloscope controlled with a dedicated LabView program. We improved
and automized the analysis to deal with large datasets. We have measured the
gain-versus-bias-voltage dependence at fixed temperature and
gain-versus-temperature dependence at fixed bias voltage to determine the bias
voltage dependence on temperature $V(T)$ for stable gain. We show that the gain
remains stable to better than $\pm 0.5\%$ in the $20^\circ \rm C - 30^\circ C$
temperature range if the bias voltage is properly adjusted with temperature.


title: Universal optical conductivity of a disordered Weyl semimetal

abstract:
  Topological Weyl semimetals, besides manifesting chiral anomaly, can also
accommodate a disorder-driven unconventional quantum phase transition into a
metallic phase. A fundamentally and practically important question in this
regard concerns an experimentally measurable quantity that can clearly
distinguish these two phases. We show that the optical conductivity while
serving this purpose can also play the role of a bonafide order parameter
across such disorder-driven semimetal-metal quantum phase transition by virtue
of displaying distinct scaling behavior in semimetallic and metallic phases, as
well as inside the quantum critical fan supporting a non-Fermi liquid. We
demonstrate that the correction to dielectric constant and optical conductivity
in a dirty Weyl semimetal due to weak disorder is independent of the actual
nature of point-like impurity scatterers. Therefore, optical conductivity can
be used as an experimentally measurable quantity to study the critical
properties and to pin the universality class of the disorder-driven quantum
phase transition in Weyl semimetals.


title: Large, Extra Dimensions at the Deep Underground Neutrino Experiment

abstract:
  We investigate the potential of the long-baseline Deep Underground Neutrino
Experiment (DUNE) to study large-extra-dimension (LED) models originally
proposed to explain the smallness of neutrino masses by postulating that
right-handed neutrinos, unlike all standard model fermion fields, can propagate
in the bulk. The massive Kaluza-Klein (KK) modes of the right-handed neutrino
fields modify the neutrino oscillation probabilities and can hence affect their
propagation. We show that, as far as DUNE is concerned, the LED model is
indistinguishable from a $(3 + 3N)$-neutrino framework for modest values of
$N$; $N$ = 1 is usually a very good approximation. Nonetheless, there are no
new sources of $CP$-invariance violation other than one $CP$-odd phase that can
be easily mapped onto the $CP$-odd phase in the standard three-neutrino
paradigm. We analyze the sensitivity of DUNE to the LED framework, and explore
the capability of DUNE to differentiate the LED model from the three-neutrino
scenario and from a generic $(3 + 1)$-neutrino model.


title:
Quantifying the (X/Peanut)-Shaped Structure in Edge-on Disc Galaxies:
  Length, Strength, and Nested Peanuts

abstract:
  X-shaped or peanut-shaped (X/P) bulges are observed in more than 40% of
(nearly) edge-on disc galaxies, though to date a robust method to quantify them
is lacking. Using Fourier harmonics to describe the deviation of galaxy
isophotes from ellipses, we demonstrate with a sample of 11 such galaxies
(including NGC 128) that the sixth Fourier component ($B_6$) carries physical
meaning by tracing this X/P structure. We introduce five quantitative
diagnostics based on the radial $B_6$ profile, namely: its `peak' amplitude
($\Pi_{\rm max}$); the (projected major-axis) `length' where this peak occurs
($R_{\Pi,max}$); its vertical `height' above the disc plane ($z_{\Pi,max}$);
the $B_6$ profile's integrated `strength' ($S_{\Pi}$); and the $B_6$ peak
`width' ($W_{\Pi}$). We also introduce different `classes' of $B_6$ profile
shape. Furthermore, we convincingly detect and measure the properties of
multiple (nested) X/P structures in individual galaxies which additionally
display the signatures of multiple bars in their surface brightness profiles,
thus consolidating further the scenario in which peanuts are associated with
bars. We reveal that the peanut parameter space (`length', `strength' and
`height') for real galaxies is not randomly populated, but the 3 metrics are
inter-correlated (both in kpc and disc scale-length $h$). Additionally, the X/P
`length' and `strength' appear to correlate with $v_{rot}/\sigma_*$, lending
further support to the notion that peanuts `know' about the galactic disc in
which they reside. Such constraints are important for simulations, as they
provide a direct link between peanuts and their host disc. Our diagnostics
reveal a spectrum of X/P properties and could provide a means of distinguishing
between different peanut formation scenarios. Moreover, nested peanuts, as
remnants of bar buckling events, can provide insights into the disc and bar
instability history.


title:
A Super-Jupiter Microlens Planet Characterized by High-Cadence KMTNet
  Microlensing Survey Observations of OGLE-2015-BLG-0954

abstract:
  We report the characterization of a massive (m_p=3.9 +- 1.4 M_jup)
microlensing planet (OGLE-2015-BLG-0954Lb) orbiting an M dwarf host (M=0.33 +-
0.12 M_sun) at a distance toward the Galactic bulge of 0.6 (+0.4,-0.2) kpc,
which is extremely nearby by microlensing standards. The planet-host projected
separation is a_perp ~ 1.2 AU. The characterization was made possible by the
wide-field (4 sq. deg.) high cadence (Gamma = 6/hr) monitoring of the Korea
Microlensing Telescope Network (KMTNet), which had two of its three telescopes
in commissioning operations at the time of the planetary anomaly. The source
crossing time t_* = 16 min is among the shortest ever published. The
high-cadence, wide-field observations that are the hallmark of KMTNet are the
only way to routinely capture such short crossings. High-cadence resolution of
short caustic crossings will preferentially lead to mass and distance
measurements for the lens. This is because the short crossing time typically
implies a nearby lens, which enables the measurement of additional effects
(bright lens and/or microlens parallax). When combined with the measured
crossing time, these effects can yield planet/host masses and distance.


title:
Supermassive black hole pairs in clumpy galaxies at high redshift:
  delayed binary formation and concurrent mass growth

abstract:
  Massive gas-rich galaxy discs at $z \sim 1-3$ host massive star-forming
clumps with typical baryonic masses in the range $10^7-10^8$~M$_{\odot}$ which
can affect the orbital decay and concurrent growth of supermassive black hole
(BH) pairs. Using a set of high-resolution simulations of isolated clumpy
galaxies hosting a pair of unequal-mass BHs, we study the interaction between
massive clumps and a BH pair at kpc scales, during the early phase of the
orbital decay. We find that both the interaction with massive clumps and the
heating of the cold gas layer of the disc by BH feedback tend to delay
significantly the orbital decay of the secondary, which in many cases is
ejected and then hovers for a whole Gyr around a separation of 1--2 kpc. In the
envelope, dynamical friction is weak and there is no contribution of disc
torques: these lead to the fastest decay once the orbit of the secondary BH has
circularised in the disc midplane. In runs with larger eccentricities the delay
is stronger, although there are some exceptions. We also show that, even in
discs with very sporadic transient clump formation, a strong spiral pattern
affects the decay time-scale for BHs on eccentric orbits. We conclude that,
contrary to previous belief, a gas-rich background is not necessarily conducive
to a fast BH decay and binary formation, which prompts more extensive
investigations aimed at calibrating event-rate forecasts for ongoing and future
gravitational-wave searches, such as with Pulsar Timing Arrays and the future
evolved Laser Interferometer Space Antenna.


title: Higher-spin Interactions from CFT: The Complete Cubic Couplings

abstract:
  In this letter we provide a complete holographic reconstruction of the cubic
couplings in the minimal bosonic higher-spin theory in AdS$_{d+1}$. For this
purpose we also determine the OPE coefficients of all single-trace conserved
currents in the $d$-dimensional free scalar $O\left(N\right)$ vector model, and
compute the tree-level three-point Witten diagram amplitudes for a generic
cubic interaction of higher-spin gauge fields in the metric-like formulation.


title: Non-thermal WIMPs and Primordial Black Holes

abstract:
  Non-thermal histories for the early universe have received notable attention
as they are a rich source of phenomenology, while also being well motivated by
top-down approaches to beyond the Standard Model physics. The early (pre-BBN)
matter phase in these models leads to enhanced growth of density perturbations
on sub-Hubble scales. Here we consider whether primordial black hole formation
associated with the enhanced growth is in conflict with existing observations.
Such constraints depend on the tilt of the primordial power spectrum, and we
find that non-thermal histories are tightly constrained in the case of a
significantly blue spectrum. Alternatively, if dark matter is taken to be of
non-thermal origin we can restrict the primordial power spectrum on scales
inaccessible to CMB and LSS observations. We establish constraints for a wide
range of scalar masses (reheat temperatures) with the most stringent bounds
resulting from the formation of $10^{15}$ g black holes. These black holes
would be evaporating today and are constrained by FERMI observations. We also
consider whether the breakdown of the coherence of the scalar oscillations on
sub-horizon scales can lead to a Jean's pressure preventing black hole
formation and relaxing our constraints. Our main conclusion is that primordial
black hole constraints, combined with existing constraints on non-thermal
WIMPs, favor a primordial spectrum closer to scale invariance or a red tilted
spectrum.


title: Faking SM Photons by Displaced Dark Photon Decays

abstract:
  A light meta-stable dark photon decaying into collimated electron/positron
pair can fake a photon, either converted or unconverted, at the LHC. The
detailed object identification relies on the specifics of the detector and
strategies for the reconstruction. We study the fake rate based on the
ATLAS(CMS) detector geometry and show that it can be O(1) with a generic choice
of parameters. Especially, the probability of being registered as a photon is
angular dependent. Such detector effects can induce bias to measurements on
certain properties of new physics. In this paper, we consider the scenario
where dark photons in final states are from a heavy resonance decay.
Consequently, the detector effects can dramatically affect the results when
determine the spin of a resonance. Further, if the decay products from the
heavy resonance are one photon and one dark photon, which has a large
probability to fake a diphoton event, the resonance is allowed to be a vector.
Due to the difference in detector, the cross sections measured in ATLAS and CMS
do not necessarily match. Furthermore, if the diphoton signal is given by the
dark photons, the SM $Z\gamma$ and $ZZ$ final states do not necessarily come
with the $\gamma\gamma$ channel, which is a unique signature in our scenario.
The issue studied here is relevant also for any future new physics searches
with photon(s) in the final state. We discuss possible ways of distinguishing
dark photon decay and real photon in the future.


title:
Full-lifetime simulations of multiple unequal-mass planets across all
  phases of stellar evolution

abstract:
  We know that planetary systems are just as common around white dwarfs as
around main sequence stars. However, self-consistently linking a planetary
system across these two phases of stellar evolution through the violent giant
branch poses computational challenges, and previous studies restricted
architectures to equal-mass planets. Here, we remove this constraint and
perform over 450 numerical integrations over a Hubble time (14 Gyr) of packed
planetary systems with unequal-mass planets. We characterize the resulting
trends as a function of planet order and mass. We find that intrusive radial
incursions in the vicinity of the white dwarf become less likely as the
dispersion amongst planet masses increases. The orbital meandering which may
sustain a sufficiently dynamic environment around a white dwarf to explain
observations is more dependent on the presence of terrestrial-mass planets than
any variation in planetary mass. Triggering unpacking or instability during the
white dwarf phase is comparably easy for systems of unequal-mass planets and
systems of equal-mass planets; instabilities during the giant branch phase
remain rare and require fine-tuning of initial conditions. We list the key
dynamical features of each simulation individually as a potential guide for
upcoming discoveries.


title: The X-shaped Bulge of the Milky Way revealed by WISE

abstract:
  The Milky Way bulge has a boxy/peanut morphology and an X-shaped structure.
This X-shape has been revealed by the `split in the red clump' from star counts
along the line of sight toward the bulge, measured from photometric surveys.
This boxy, X-shaped bulge morphology is not unique to the Milky Way and such
bulges are observed in other barred spiral galaxies. N-body simulations show
that boxy and X-shaped bulges are formed from the disk via dynamical
instabilities. It has also been proposed that the Milky Way bulge is not
X-shaped, but rather, the apparent split in the red clump stars is a
consequence of different stellar populations, in an old classical spheroidal
bulge. We present a WISE image of the Milky Way bulge, produced by downsampling
the publicly available "unWISE" coadds. The WISE image of the Milky Way bulge
shows that the X-shaped nature of the Milky Way bulge is self-evident and
irrefutable. The X-shape morphology of the bulge in itself and the fraction of
bulge stars that comprise orbits within this structure has important
implications for the formation history of the Milky Way, and, given the
ubiquity of boxy X-shaped bulges, spiral galaxies in general.


title:
Thinking outside the ROCs: Designing Decorrelated Taggers (DDT) for jet
  substructure

abstract:
  We explore the scale-dependence and correlations of jet substructure
observables to improve upon existing techniques in the identification of highly
Lorentz-boosted objects. Modified observables are designed to remove
correlations from existing theoretically well-understood observables, providing
practical advantages for experimental measurements and searches for new
phenomena. We study such observables in $W$ jet tagging and provide
recommendations for observables based on considerations beyond signal and
background efficiencies.


title: A Unified Universe

abstract:
  We present a unified evolution of the universe from very early times until
the present epoch by including both the leading local correction $R^2$ and the
leading non-local term $R\frac{1}{\square^2}R$ to the classical gravitational
action. We find that the inflationary phase driven by $R^2$ term gracefully
exits in a transitory regime characterized by coherent oscillations of the
Hubble parameter. The universe then naturally enters into a radiation dominated
epoch followed by a matter dominated era. At sufficiently late times after
radiation-matter equality, the non-local term starts to dominate inducing an
accelerated expansion of the universe at the present epoch. We further exhibit
the fact that both the leading local and non-local terms can be obtained within
the covariant effective field theory of gravity. This scenario thus provides a
unified picture of inflation and dark energy in a single framework by means of
a purely gravitational action without the usual need of a scalar field.


title:
Collision velocity of dust grains in self-gravitating protoplanetary
  discs

abstract:
  We have conducted the first comprehensive numerical investigation of the
relative velocity distribution of dust particles in self-gravitating
protoplanetary discs with a view to assessing the viability of planetesimal
formation via direct collapse in such environments. The viability depends
crucially on the large sizes that are preferentially collected in pressure
maxima produced by transient spiral features (Stokes numbers, $St \sim 1$);
growth to these size scales requires that collision velocities remain low
enough that grain growth is not reversed by fragmentation. We show that, for a
single sized dust population, velocity driving by the disc's gravitational
perturbations is only effective for $St > 3$, while coupling to the gas
velocity dominates otherwise. We develop a criterion for understanding this
result in terms of the stopping distance being of order the disc scale height.
Nevertheless, the relative velocities induced by differential radial drift in
multi-sized dust populations are too high to allow the growth of silicate dust
particles beyond $St \sim 10^{-2}$ or $10^{-1}$ ($10\,\mathrm{cm}$ to
$\mathrm{m}$ sizes at $30\,\mathrm{au}$), such Stokes numbers being
insufficient to allow concentration of solids in spiral features. However, for
icy solids (which may survive collisions up to several
$10\,\mathrm{m\,s}^{-1}$), growth to $St \sim 1$ ($10\,\mathrm{m}$ size) may be
possible beyond $30\,\mathrm{au}$ from the star. Such objects would be
concentrated in spiral features and could potentially produce larger icy
planetesimals/comets by gravitational collapse. These planetesimals would
acquire moderate eccentricities and remain unmodified over the remaining
lifetime of the disc.


title: Little Conformal Symmetry

abstract:
  We explore a new class of natural models which ensure the one-loop
divergences in the Higgs mass are cancelled. The top-partners that cancel the
top loop are new gauge bosons, and the symmetry relation that ensures the
cancellation arises at an infrared fixed point. Such a cancellation mechanism
can, a la Little Higgs models, push the scale of new physics that completely
solves the hierarchy problem up to 5-10 TeV. When embedded in a supersymmetric
model, the stop and gaugino masses provide the cutoffs for the loops, and the
mechanism ensures a cancellation between the stop and gaugino mass dependence
of the Higgs mass parameter.


title:
Superconducting quantum criticality in three-dimensional Luttinger
  semimetals

abstract:
  We study a simple model of three-dimensional fermions close to a quadratic
band touching point, built from the celebrated Luttinger single-particle
Hamiltonian and an attractive contact interaction between the particles. Such a
system displays a novel quantum critical point between the semimetallic and an
s-wave superconducting phase at which the low-energy "Luttinger fermions" are
inextricably coupled to the order parameter fluctuations. The quantum critical
point is perturbatively accessible near four spatial dimensions, where it
features nontrivial scaling with dynamical exponent 1<z<2 and emergent
rotational and particle-hole symmetries. Some features of the criticality, such
as oscillatory corrections to scaling and its enhanced symmetry, are discussed.

categories: cond-mat.str-el cond-mat.stat-mech cond-mat.supr-con hep-th


title:
Constraining ultra-compact dwarf galaxy formation with galaxy clusters
  in the local universe

abstract:
  We compare the predictions of a semi-analytic model for ultra-compact dwarf
galaxy (UCD) formation by tidal stripping to the observed properties of
globular clusters (GCs) and UCDs in the Fornax and Virgo clusters. For Fornax
we find the predicted number of stripped nuclei agrees very well with the
excess number of GCs$+$UCDs above the GC luminosity function. GCs$+$UCDs with
masses $>10^{7.3}$ M$_\odot$ are consistent with being entirely formed by tidal
stripping. Stripped nuclei can also account for Virgo UCDs with masses
$>10^{7.3}$ M$_\odot$ where numbers are complete by mass. For both Fornax and
Virgo, the predicted velocity dispersions and radial distributions of stripped
nuclei are consistent with that of UCDs within $\sim$50-100 kpc but disagree at
larger distances where dispersions are too high and radial distributions too
extended. Stripped nuclei are predicted to have radially biased anisotropies at
all radii, agreeing with Virgo UCDs at clustercentric distances larger than 50
kpc. However, ongoing disruption is not included in our model which would cause
orbits to become tangentially biased at small radii. We find the predicted
metallicities and central black hole masses of stripped nuclei agree well with
the metallicities and implied black hole masses of UCDs for masses $>10^{6.5}$
M$_\odot$. The predicted black hole masses also agree well with that of
M60-UCD1, the first UCD with a confirmed central black hole. These results
suggest that observed GC$+$UCD populations are a combination of genuine GCs and
stripped nuclei, with the contribution of stripped nuclei increasing toward the
high-mass end.


title:
Rapidly evolving faint transients from stripped-envelope
  electron-capture supernovae

abstract:
  We investigate the expected rates and bolometric light-curve properties of
stripped-envelope electron-capture supernovae (ECSNe) using stellar models from
the Binary Population and Spectral Synthesis (BPASS) code. We find that 0.8 per
cent (Z = 0.020) and 1.2 per cent (Z = 0.004) of core-collapse supernovae are
stripped-envelope ECSNe. Their typical ejecta masses are estimated to be about
0.3 Msun (Z = 0.020) and 0.6 Msun (Z = 0.004). Assuming ECSN explosion
properties from numerical explosion simulations, an explosion energy of 1.5e50
erg and a 56Ni mass of 2.5e-3 Msun, we find that stripped-envelope ECSNe have a
typical rise time of around 7 days (Z = 0.020) or 13 days (Z = 0.004) and peak
luminosity of around 1e41 erg/s (-13.8 mag, Z = 0.020) or 7e40 erg/s (-13.4
mag, Z = 0.004). Their typical ejecta velocities are around 7000 km/s (Z =
0.020) or 5000 km/s (Z = 0.004). Thus, stripped-envelope ECSNe are observed as
rapidly-evolving faint transients with relatively small velocities. SN
2008ha-like supernovae, which are the faintest kind of SN 2002cx-like (a.k.a.
Type Iax) supernovae, may be related to stripped-envelope ECSNe.


title:
The Aurora radiation-hydrodynamical simulations of reionization:
  calibration and first results

abstract:
  We introduce a new suite of radiation-hydrodynamical simulations of galaxy
formation and reionization called Aurora. The Aurora simulations make use of a
spatially adaptive radiative transfer technique that lets us accurately capture
the small-scale structure in the gas at the resolution of the hydrodynamics, in
cosmological volumes. In addition to ionizing radiation, Aurora includes
galactic winds driven by star formation and the enrichment of the universe with
metals synthesized in the stars. Our reference simulation uses 2x512^3 dark
matter and gas particles in a box of size 25 comoving Mpc/h with a force
softening scale of at most 0.28 kpc/h. It is accompanied by simulations in
larger and smaller boxes and at higher and lower resolution, employing up to
2x1024^3 particles, to investigate numerical convergence. All simulations are
calibrated to yield simulated star formation rate (SFR) functions in close
agreement with observational constraints at redshift z = 7 and to achieve
reionization at z = 8.3, which is consistent with the observed optical depth to
reionization. We focus on the design and calibration of the simulations and
present some first results. The median stellar metallicities of low-mass
galaxies at z = 6 are consistent with the metallicities of dwarf galaxies in
the Local Group, which are believed to have formed most of their stars at high
redshifts. After reionization, the mean photoionization rate decreases
systematically with increasing resolution. This coincides with a systematic
increase in the abundance of neutral hydrogen absorbers in the IGM.


title:
Broad Hbeta Emission-Line Variability in a Sample of 102 Local Active
  Galaxies

abstract:
  A sample of 102 local (0.02 < z < 0.1) Seyfert galaxies with black hole
masses MBH > 10^7 M_sun was selected from the Sloan Digital Sky Survey (SDSS)
and observed using the Keck 10-m telescope to study the scaling relations
between MBH and host galaxy properties. We study profile changes of the broad
Hbeta emission line within the ~3-9 year time-frame between the two sets of
spectra. The variability of the broad Hbeta emission line is of particular
interest, not only since it is used to estimate MBH, but also since its
strength and width is used to classify Seyfert galaxies into different types.
At least some form of broad-line variability (in either width or flux) is
observed in the majority (~66%) of the objects, resulting in a Seyfert-type
change for ~38% of the objects, likely driven by variable accretion and/or
obscuration. The broad Hbeta line virtually disappears in 3/102 (~3%) extreme
cases. We discuss potential causes for these changing-look AGNs. While similar
dramatic transitions have previously been reported in the literature, either on
a case-by-case basis or in larger samples focusing on quasars at higher
redshifts, our study provides statistical information on the frequency of
H$\beta$ line variability in a sample of low-redshift Seyfert galaxies.


title:
The Diverse Origins of Neutron-Capture Elements in the Metal-Poor Star
  HD 94028: Possible Detection of Products of i-process Nucleosynthesis

abstract:
  We present a detailed analysis of the composition and nucleosynthetic origins
of the heavy elements in the metal-poor ([Fe/H]=-1.62+/-0.09) star HD94028.
Previous studies revealed that this star is mildly enhanced in elements
produced by the slow neutron-capture process (s-process; e.g.,
[Pb/Fe]=+0.79+/-0.32) and rapid neutron-capture process (r-process; e.g.,
[Eu/Fe]=+0.22+/-0.12), including unusually large molybdenum
([Mo/Fe]=+0.97+/-0.16) and ruthenium ([Ru/Fe]=+0.69+/-0.17) enhancements.
However, this star is not enhanced in carbon ([C/Fe]=-0.06+/-0.19). We analyze
an archival near-ultraviolet spectrum of HD94028, collected using the Space
Telescope Imaging Spectrograph on board the Hubble Space Telescope, and other
archival optical spectra collected from ground-based telescopes. We report
abundances or upper limits derived from 64 species of 56 elements. We compare
these observations with s-process yields from low-metallicity AGB evolution and
nucleosynthesis models. No combination of s- and r-process patterns can
adequately reproduce the observed abundances, including the super-solar [As/Ge]
ratio (+0.99+/-0.23) and the enhanced [Mo/Fe] and [Ru/Fe] ratios. We can fit
these features when including an additional contribution from the intermediate
neutron-capture process (i process), which perhaps operated by the ingestion of
H in He-burning convective regions in massive stars, super-AGB stars, or
low-mass AGB stars. Currently, only the i process appears capable of
consistently producing the super-solar [As/Ge] ratios and ratios among
neighboring heavy elements found in HD94028. Other metal-poor stars also show
enhanced [As/Ge] ratios, hinting that operation of the i process may have been
common in the early Galaxy.


title:
Unique Fock quantization of a massive fermion field in a cosmological
  scenario

abstract:
  It is well known that the Fock quantization of field theories in general
spacetimes suffers from an infinite ambiguity, owing to the inequivalent
possibilities in the selection of a representation of the canonical commutation
or anticommutation relations, but also owing to the freedom in the choice of
variables to describe the field among all those related by linear
time-dependent transformations, including the dependence through functions of
the background. In this work we remove this ambiguity (up to unitary
equivalence) in the case of a massive Dirac free field propagating in a
spacetime with homogeneous and isotropic spatial sections of spherical
topology. Two physically reasonable conditions are imposed in order to arrive
to this result: (a) The invariance of the vacuum under the spatial isometries
of the background, and (b) the unitary implementability of the dynamical
evolution that dictates the Dirac equation. We characterize the Fock
quantizations with a non trivial fermion dynamics that satisfy these two
conditions. Then, we provide a complete proof of the unitary equivalence of the
representations in this class under very mild requirements on the time
variation of the background, once a criterion to discern between particles and
antiparticles has been set.


title:
Focused Azimuthally Polarized Vector Beam and Spatial Magnetic
  Resolution below the Diffraction Limit

abstract:
  An azimuthally electric-polarized vector beam (APB), with a polarization
vortex, has a salient feature that it contains a magnetic-dominant region
within which electric field ideally has a null while longitudinal magnetic
field is maximum. Fresnel diffraction theory and plane-wave spectral (PWS)
calculations are applied to quantify field features of such a beam upon
focusing through a lens. The diffraction-limited full width at half maximum
(FWHM) of the beam's longitudinal magnetic field intensity profile and
complementary FWHM (CFWHM) of the beam's annular-shaped total electric field
intensity profile are examined at the lens's focal plane as a function of the
lens's paraxial focal distance. Then, we place a subwavelength dense dielectric
Mie scatterer in the minimum-waist plane of a self-standing converging APB and
demonstrate for the first time that a very high resolution magnetic field at
optical frequency is achieved with total magnetic field FWHM of 0.23{\lambda}
(i.e., magnetic field spot area of 0.04{\lambda}^2) within a magnetic-dominant
region. The theory shown here is valuable for development of optical microscopy
and spectroscopy systems based on magnetic dipolar transitions which are in
general much weaker than their electric counterparts.


title:
Higher derivative corrections to BPS black hole attractors in 4d gauged
  supergravity

abstract:
  We analyze BPS black hole attractors in 4d gauged supergravity in the
presence of higher derivative supersymmetric terms, including a
Weyl-squared-type action, and determine the resulting corrections to the
Bekenstein-Hawking entropy. The near-horizon geometry AdS$_2 \times$S$^2$ (or
other Riemann surface) preserves half of the supercharges in $N=2$ supergravity
with Fayet-Iliopoulos gauging. We derive a relation between the entropy and the
black hole charges that suggests via AdS/CFT how subleading corrections
contribute to the supersymmetric index in the dual microscopic picture.
  Depending on the model, the attractors are part of full black hole solutions
with different asymptotics, such as Minkowski, AdS$_4$, and hvLif$_4$. We give
explicit examples for each of the asymptotic cases and comment on the
implications. Among other results, we find that the Weyl-squared terms spoil
the exact two-derivative relation to non-BPS asymptotically flat black holes in
ungauged supergravity.


title: Model-Based Iterative Reconstruction for Radial Fast Spin-Echo MRI

abstract:
  In radial fast spin-echo MRI, a set of overlapping spokes with an
inconsistent T2 weighting is acquired, which results in an averaged image
contrast when employing conventional image reconstruction techniques. This work
demonstrates that the problem may be overcome with the use of a dedicated
reconstruction method that further allows for T2 quantification by extracting
the embedded relaxation information. Thus, the proposed reconstruction method
directly yields a spin-density and relaxivity map from only a single radial
data set. The method is based on an inverse formulation of the problem and
involves a modeling of the received MRI signal. Because the solution is found
by numerical optimization, the approach exploits all data acquired. Further, it
handles multi-coil data and optionally allows for the incorporation of
additional prior knowledge. Simulations and experimental results for a phantom
and human brain in vivo demonstrate that the method yields spin-density and
relaxivity maps that are neither affected by the typical artifacts from TE
mixing, nor by streaking artifacts from the incomplete k-space coverage at
individual echo times.


title:
How to infer non-Abelian statistics and topological invariants from
  tunneling conductance properties of realistic Majorana nanowires

abstract:
  We consider a simple conceptual question with respect to Majorana zero modes
in semiconductor nanowires: Can the measured non-ideal values of the
zero-bias-conductance-peak in the tunneling experiments be used as a
characteristic to predict the underlying topological nature of the proximity
induced nanowire superconductivity? In particular, we define and calculate the
topological visibility, which is a variation of the topological invariant
associated with the scattering matrix of the system as well as the
zero-bias-conductance-peak heights in the tunneling measurements, in the
presence of dissipative broadening, using realistic nanowire parameters to
connect the topological invariants with the zero bias tunneling conductance
values. This dissipative broadening is present in both (the existing) tunneling
measurements and also (any future) braiding experiments as an inevitable
consequence of a finite braiding time. The connection between the topological
visibility and the conductance allows us to obtain the visibility of realistic
braiding experiments in nanowires, and to conclude that the current
experimentally accessible systems with non-ideal zero bias conductance peaks
may indeed manifest (with rather low visibility) non-Abelian statistics for the
Majorana zero modes. In general, we find that large (small) superconducting gap
(Majorana peak splitting) is essential for the manifestation of the non-Abelian
braiding statistics, and in particular, a zero bias conductance value of around
half the ideal quantized Majorana value should be sufficient for the
manifestation of non-Abelian statistics in experimental nanowires.


title: A Transiting Jupiter Analog

abstract:
  Decadal-long radial velocity surveys have recently started to discover
analogs to the most influential planet of our solar system, Jupiter. Detecting
and characterizing these worlds is expected to shape our understanding of our
uniqueness in the cosmos. Despite the great successes of recent transit
surveys, Jupiter analogs represent a terra incognita, owing to the strong
intrinsic bias of this method against long orbital periods. We here report on
the first validated transiting Jupiter analog, Kepler-167e (KOI-490.02),
discovered using Kepler archival photometry orbiting the K4-dwarf KIC-3239945.
With a radius of $(0.91\pm0.02)$ $R_{\mathrm{Jup}}$, a low orbital eccentricity
($0.06_{-0.04}^{+0.10}$) and an equilibrium temperature of $(131\pm3)$ K,
Kepler-167e bears many of the basic hallmarks of Jupiter. Kepler-167e is
accompanied by three Super-Earths on compact orbits, which we also validate,
leaving a large cavity of transiting worlds around the habitable-zone. With two
transits and continuous photometric coverage, we are able to uniquely and
precisely measure the orbital period of this post snow-line planet
($1071.2323\pm0.0006$ d), paving the way for follow-up of this $K=11.8$ mag
target.


title:
Witnesses of causal nonseparability: an introduction and a few case
  studies

abstract:
  It was recently realised that quantum theory allows for so-called causally
nonseparable processes, which are incompatible with any definite causal order.
This was first suggested on a rather abstract level by the formalism of process
matrices, which only assumes that quantum theory holds locally in some
observers' laboratories, but does not impose a global causal structure; it was
then shown, on a more practical level, that the quantum switch---a new resource
for quantum computation that goes beyond causally ordered circuits---provided
precisely a physical example of a causally nonseparable process. To demonstrate
that a given process is causally nonseparable, we introduced in [Ara\'ujo et
al., New J. Phys. 17, 102001 (2015)] the concept of witnesses of causal
nonseparability. Here we present a shorter introduction to this concept, and
concentrate on some explicit examples to show how to construct and use such
witnesses in practice.


title:
Remarks about the thermodynamics of astrophysical systems in mutual
  interaction and related notions

abstract:
  General aspects about the thermodynamics of astrophysical systems are
discussed, overall, those concerning to astrophysical systems in mutual
interaction (or the called \emph{open astrophysical systems}). A special
interest is devoted along the paper to clarify several misconceptions that are
still common in the recent literature, such as the direct application to the
astrophysical scenario of notions and theoretical frameworks that were
originally conceived to deal with extensive systems of the everyday practice
(large systems with short-range interactions).


title: Integral dimension of a noetherian ring

abstract:
  In this paper, we introduce a new notion, called the integral dimension, for
noetherian rings. It can be regarded as the weak Briancon-Skoda numbers of
rings. The point is that every noetherian local ring has finite integral
dimension.


title:
The chirally rotated Schr\"odinger functional: theoretical expectations
  and perturbative tests

abstract:
  The chirally rotated Schr\"odinger functional ($\chi$SF) with massless
Wilson-type fermions provides an alternative lattice regularization of the
Schr\"odinger functional (SF), with different lattice symmetries and a common
continuum limit expected from universality. The explicit breaking of flavour
and parity symmetries needs to be repaired by tuning the bare fermion mass and
the coefficient of a dimension 3 boundary counterterm. Once this is achieved
one expects the mechanism of automatic O($a$) improvement to be operational in
the $\chi$SF, in contrast to the standard formulation of the SF. This is
expected to significantly improve the attainable precision for step-scaling
functions of some composite operators. Furthermore, the $\chi$SF offers new
strategies to determine finite renormalization constants which are
traditionally obtained from chiral Ward identities. In this paper we consider a
complete set of fermion bilinear operators, define corresponding correlation
functions and explain the relation to their standard SF counterparts. We
discuss renormalization and O($a$) improvement and then use this set-up to
formulate the theoretical expectations which follow from universality.
Expanding the correlation functions to one-loop order of perturbation theory we
then perform a number of non-trivial checks. In the process we obtain the
action counterterm coefficients to one-loop order and reproduce some known
perturbative results for renormalization constants of fermion bilinears. By
confirming the theoretical expectations, this perturbative study lends further
support to the soundness of the $\chi$SF framework and prepares the ground for
non-perturbative applications.


title: Strictly commutative complex orientation theory

abstract:
  For a multiplicative cohomology theory E, complex orientations are in
bijective correspondence with multiplicative natural transformations to E from
complex bordism cohomology MU. If E is represented by a spectrum with a highly
structured multiplication, we give an iterative process for lifting an
orientation MU -> E to a map respecting this extra structure, based on work of
Arone-Lesh. The space of strictly commutative orientations is the limit of an
inverse tower of spaces parametrizing partial lifts; stage 1 corresponds to
ordinary complex orientations, and lifting from stage (m-1) to stage m is
governed by the existence of a orientation for a family of E-modules over a
fixed base space F_m.
  When E is p-local, we can say more. We find that this tower only changes when
m is a power of p, and if E is E(n)-local the tower is constant after stage
p^n. Moreover, if the coefficient ring E^* is p-torsion free, the ability to
lift from stage 1 to stage p is equivalent to a condition on the associated
formal group law that was shown necessary by Ando.


title: Non-random structures in universal compression and the Fermi paradox

abstract:
  We study the hypothesis of information panspermia assigned recently among
possible solutions of the Fermi paradox ("where are the aliens?"). It suggests
that the expenses of alien signaling can be significantly reduced, if their
messages contain compressed information. To this end we consider universal
compression and decoding mechanisms (e.g. the Lempel-Ziv-Welch algorithm) that
can reveal non-random structures in compressed bit strings. The efficiency of
Kolmogorov stochasticity parameter for detection of non-randomness is
illustrated, along with the Zipf's law. The universality of these methods, i.e.
independence on data details, can be principal in searching for intelligent
messages.

categories: astro-ph.IM cs.IT math.IT physics.data-an


title: Dynamics of annulus maps III: completeness

abstract:
  Consider a continuous surjective self map of the open annulus with degree d >
1. It is proved that the number of Nielsen classes of periodic points is
maximum possible whenever f has a completely invariant essential continuum. The
same result is obtained in negative degree |d| > 1 and for just forward
invariant essential continua, provided that the continuum is locally connected.
We also deal with the problem of wether there is a representative of each
Nielsen class in the filled set of the invariant continuum. Moreover, if the
map extends continuously to the boundary of the annulus and both boundary
components are either attracting or repelling, the hypothesis on the existence
of the invariant continuum is no longer needed for obtaining all the periodic
points in the interior of the annulus.


title:
Learning, Visualizing, and Exploiting a Model for the Intrinsic Value of
  a Batted Ball

abstract:
  We present an algorithm for learning the intrinsic value of a batted ball in
baseball. This work addresses the fundamental problem of separating the value
of a batted ball at contact from factors such as the defense, weather, and
ballpark that can affect its observed outcome. The algorithm uses a Bayesian
model to construct a continuous mapping from a vector of batted ball parameters
to an intrinsic measure defined as the expected value of a linear weights
representation for run value. A kernel method is used to build nonparametric
estimates for the component probability density functions in Bayes theorem from
a set of over one hundred thousand batted ball measurements recorded by the
HITf/x system during the 2014 major league baseball (MLB) season.
Cross-validation is used to determine the optimal vector of smoothing
parameters for the density estimates. Properties of the mapping are visualized
by considering reduced-dimension subsets of the batted ball parameter space. We
use the mapping to derive statistics for intrinsic quality of contact for
batters and pitchers which have the potential to improve the accuracy of player
models and forecasting systems. We also show that the new approach leads to a
simple automated measure of contact-adjusted defense and provides insight into
the impact of environmental variables on batted balls.


title: Algebraic Method in Tilings

abstract:
  In this paper we introduce a new algebraic method in tilings. Combining this
method with Hilbert's Nullstellensatz we obtain a necessary condition for
tiling $n$-space by translates of a cluster of cubes. Further, the polynomial
method will enable us to show that if there exists a tiling of $n$-space by
translates of a cluster $V$ of prime size then there is a lattice tiling by $V$
as well. Finally, we provide supporting evidence for a conjecture that each
tiling by translates of a prime size cluster $V$ is lattice if $V$ generates
$n$-space.


title: Self-forces on static bodies in arbitrary dimensions

abstract:
  We derive exact expressions for the scalar and electromagnetic self-forces
and self-torques acting on arbitrary static extended bodies in arbitrary static
spacetimes with any number of dimensions. Non-perturbatively, our results are
identical in all dimensions. Meaningful point particle limits are quite
different in different dimensions, however. These limits are defined and
evaluated, resulting in simple "regularization algorithms" which can be used in
concrete calculations. In these limits, self-interaction is shown to be
progressively less important in higher numbers of dimensions; it generically
competes in magnitude with increasingly high-order extended-body effects.
Conversely, we show that self-interaction effects can be relatively large in
$1+1$ and $2+1$ dimensions. Our motivations for this work are twofold: First,
no previous derivation of the self-force has been provided in arbitrary
dimensions, and heuristic arguments presented by different authors have
resulted in conflicting conclusions. Second, the static self-force problem in
arbitrary dimensions provides a valuable testbed with which to continue the
development of general, non-perturbative methods in the theory of motion.
Several new insights are obtained in this direction, including a significantly
improved understanding of the renormalization process. We also show that there
is considerable freedom to use different "effective fields" in the laws of
motion---a freedom which can be exploited to optimally simplify specific
problems. Different choices give rise to different inertias, gravitational
forces, and electromagnetic or scalar self-forces, but there is a sense in
which none of these quantities are individually accessible to experiment.
Certain combinations are observable, however, and these remain invariant under
all possible field redefinitions.


title:
Stable Ergodicity and Accessibility for certain Partially Hyperbolic
  Diffeomorphisms with Bidimensional Center Leaves

abstract:
  We consider classes of partially hyperbolic diffeomorphism $f:M\to M$ with
splitting $TM=E^s\oplus E^c\oplus E^u$ and $\dim E^c=2$. These classes include
for instance (perturbations of) the product of Anosov and conservative surface
diffeomorphisms, skew products of surface diffeomorphisms over Anosov,
partially hyperbolic symplectomorphisms on manifolds of dimension four with
bidimensional center foliation whose center leaves are all compact. We prove
that accessibility holds in these classes for $C^1$ open and $C^r$ dense
subsets and moreover they are stably ergodic.


title:
BosonSampling with single-photon Fock states from a bright solid-state
  source

abstract:
  A BosonSampling device is a quantum machine expected to perform tasks
intractable for a classical computer, yet requiring minimal non-classical
resources as compared to full-scale quantum computers. Photonic implementations
to date employed sources based on inefficient processes that only simulate
heralded single-photon statistics when strongly reducing emission
probabilities. BosonSampling with only single-photon input has thus never been
realised. Here, we report on a BosonSampling device operated with a bright
solid-state source of single-photon Fock states with high photon-number purity:
the emission from an efficient and deterministic quantum dot-micropillar system
is demultiplexed into three partially-indistinguishable single-photons, with a
single-photon purity $1{-}g^{(2)}(0)$ of $0.990{\pm}0.001$, interfering in a
linear optics network. Our demultiplexed source is between one and two
orders-of-magnitude more efficient than current heralded multi-photon sources
based on spontaneous parametric downconversion, allowing us to complete the
BosonSampling experiment faster than previous equivalent implementations.


title:
Domain Topology and Domain Switching Kinetics in a Hybrid Improper
  Ferroelectric

abstract:
  Charged polar interfaces such as charged ferroelectric domain walls or
heterostructured interfaces of ZnO/(Zn,Mg)O and LaAlO3/SrTiO3, across which the
normal component of electric polarization changes suddenly, can host large
two-dimensional conduction. Charged ferroelectric walls, which are
energetically unfavorable in general, were found to be mysteriously abundant in
hybrid improper ferroelectric (Ca,Sr)3Ti2O7 crystals. From the exploration of
antiphase boundaries in bilayer-perovskites, we discover that each of four
polarization-direction states is degenerated with two antiphase domains, and
these eight structural variants form a Z4xZ2 domain structure with Z3 vortices
and five distinct types of domain walls, whose topology is directly relevant to
the presence of abundant charged walls. We also discover a zipper-like nature
of antiphase boundaries; they are the reversible creation/annihilation centers
of pairs of two types of ferroelectric walls (and also Z3-vortex pairs) in 90
and 180 degree polarization switching. Our results demonstrate the unexpectedly
rich nature of hybrid improper ferroelectricity.


title:
Probing Theories of Gravity with Phase Space-Inferred Potentials of
  Galaxy Clusters

abstract:
  Modified theories of gravity provide us with a unique opportunity to generate
innovative tests of gravity. In Chameleon f(R) gravity, the gravitational
potential differs from the weak-field limit of general relativity (GR) in a
mass dependent way. We develop a probe of gravity which compares high mass
clusters, where Chameleon effects are weak, to low mass clusters, where the
effects can be strong. We utilize the escape velocity edges in the
radius/velocity phase space to infer the gravitational potential profiles on
scales of 0.3-1 virial radii. We show that the escape edges of low mass
clusters are enhanced compared to GR, where the magnitude of the difference
depends on the background field value |fR0|. We validate our probe using N-body
simulations and simulated light cone galaxy data. For a DESI (Dark Energy
Spectroscopic Instrument) Bright Galaxy Sample, including observational
systematics, projection effects, and cosmic variance, our test can
differentiate between GR and Chameleon f(R) gravity models, |fR0| = 4e-6 (2e-6)
at > 5{\sigma} (> 2{\sigma}), more than an order of magnitude better than
current cluster-scale constraints.


title: Low-Mass Active Galactic Nuclei with Rapid X-Ray Variability

abstract:
  We present a detailed study of the optical spectroscopic properties of 12
active galactic nuclei (AGNs) with candidate low-mass black holes (BHs)
selected by Kamizasa et al. through rapid X-ray variability. The high-quality,
echellette Magellan spectra reveal broad H$\alpha$ emission in all the sources,
allowing us to estimate robust viral BH masses and Eddington ratios for this
unique sample. We confirm that the sample contains low-mass BHs accreting at
high rates: the median $M_{\rm BH} = 1.2\times 10^6M_\odot$ and median $L_{\rm
bol}/L_{\rm Edd}=0.44$. The sample follows the $M_{\rm BH}-\sigma_*$ relation,
within the considerable scatter typical of pseudobulges, the probable hosts of
these low-mass AGNs. Various lines of evidence suggest that ongoing star
formation is prevalent in these systems. We propose a new strategy to estimate
star formation rates in AGNs hosted by low-mass, low-metallicity galaxies,
based on modification of an existing method using the strength of [O II]
$\lambda 3727$, [O III] $\lambda 5007$, and X-rays.


title: Neural and perceptual signatures of efficient sensory coding

abstract:
  The mammalian brain is a metabolically expensive device, and evolutionary
pressures have presumably driven it to make productive use of its resources.
For sensory areas, this concept has been expressed more formally as an
optimality principle: the brain maximizes the information that is encoded about
relevant sensory variables, given available resources. Here, we develop this
efficiency principle for encoding a sensory variable with a heterogeneous
population of noisy neurons, each responding to a particular range of values.
The accuracy with which the population represents any particular value depends
on the number of cells that respond to that value, their selectivity, and their
response levels. We derive the optimal solution for these parameters in closed
form, as a function of the probability of stimulus values encountered in the
environment. This optimal neural population also imposes limitations on the
ability of the organism to discriminate different values of the encoded
variable. As a result, we predict an explicit relationship between the
statistical properties of the environment, the allocation and selectivity of
neurons within populations, and perceptual discriminability. We test this
relationship for three visual and two auditory attributes, and find that it is
remarkably consistent with existing data.


title: You Are What Apps You Use: Demographic Prediction Based on User's Apps

abstract:
  Understanding the demographics of app users is crucial, for example, for app
developers, who wish to target their advertisements more effectively. Our work
addresses this need by studying the predictability of user demographics based
on the list of a user's apps which is readily available to many app developers.
We extend previous work on the problem on three frontiers: (1) We predict new
demographics (age, race, and income) and analyze the most informative apps for
four demographic attributes included in our analysis. The most predictable
attribute is gender (82.3 % accuracy), whereas the hardest to predict is income
(60.3 % accuracy). (2) We compare several dimensionality reduction methods for
high-dimensional app data, finding out that an unsupervised method yields
superior results compared to aggregating the apps at the app category level,
but the best results are obtained simply by the raw list of apps. (3) We look
into the effect of the training set size and the number of apps on the
predictability and show that both of these factors have a large impact on the
prediction accuracy. The predictability increases, or in other words, a user's
privacy decreases, the more apps the user has used, but somewhat surprisingly,
after 100 apps, the prediction accuracy starts to decrease.


title: Anchored Rectangle and Square Packings

abstract:
  For points $p_1,\ldots , p_n$ in the unit square $[0,1]^2$, an \emph{anchored
rectangle packing} consists of interior-disjoint axis-aligned empty rectangles
$r_1,\ldots , r_n\subseteq [0,1]^2$ such that point $p_i$ is a corner of the
rectangle $r_i$ (that is, $r_i$ is \emph{anchored} at $p_i$) for $i=1,\ldots,
n$. We show that for every set of $n$ points in $[0,1]^2$, there is an anchored
rectangle packing of area at least $7/12-O(1/n)$, and for every $n\in
\mathbf{N}$, there are point sets for which the area of every anchored
rectangle packing is at most $2/3$. The maximum area of an anchored
\emph{square} packing is always at least $5/32$ and sometimes at most $7/27$.
  The above constructive lower bounds immediately yield constant-factor
approximations, of $7/12 -\varepsilon$ for rectangles and $5/32$ for squares,
for computing anchored packings of maximum area in $O(n\log n)$ time. We prove
that a simple greedy strategy achieves a $9/47$-approximation for anchored
square packings, and $1/3$ for lower-left anchored square packings. Reductions
to maximum weight independent set (MWIS) yield a QPTAS and a PTAS for anchored
rectangle and square packings in $n^{O(1/\varepsilon)}$ and $\exp({\rm
poly}(\log (n/\varepsilon)))$ time, respectively.


title: Isogeometric analysis for turbulent flow

abstract:
  The article is devoted to the simulation of viscous incompressible turbulent
fluid flow based on solving the Reynolds averaged Navier-Stokes (RANS)
equations with different k-omega models. The isogeometrical approach is used
for the discretization based on the Galerkin method. Primary goal of using
isogeometric analysis is to be always geometrically exact, independent of the
discretization, and to avoid a time-consuming generation of meshes of
computational domains. For higher Reynolds numbers, we use stabilization SUPG
technique in equations for k and omega. The solutions are compared with the
standard benchmark example of turbulent flow over a backward facing step.


title: T-branes through 3d mirror symmetry

abstract:
  T-branes are exotic bound states of D-branes, characterized by mutually
non-commuting vacuum expectation values for the worldvolume scalars. The
M/F-theory geometry lifting D6/D7-brane configurations is blind to the T-brane
data. In this paper, we make this data manifest, by probing the geometry with
an M2-brane. We find that the effect of a T-brane is to deform the membrane
worldvolume superpotential with monopole operators, which partially break the
three-dimensional flavor symmetry, and reduce supersymmetry from N=4 to N=2.
Our main tool is 3d mirror symmetry. Through this language, a very concrete
framework is developed for understanding T-branes in M-theory. This leads us to
uncover a new class of N=2 quiver gauge theories, whose Higgs branches mimic
those of membranes at ADE singularities, but whose Coulomb branches differ from
their N=4 counterparts.


title:
Electromagnetic wave propagation in metamaterials: a visual guide to
  Fresnel-Kummer surfaces and their singular points

abstract:
  The propagation of light through bianisotropic materials is studied in the
geometrical optics approximation. For that purpose, we use the quartic general
dispersion equation specified by the Tamm-Rubilar tensor, which is cubic in the
electromagnetic response tensor of the medium. A collection of different and
remarkable Fresnel (wave) surfaces is gathered, and unified via the projective
geometry of Kummer surfaces.


title: Regular Poisson manifolds of compact types (PMCT 2)

abstract:
  This is the second paper of a series dedicated to the study of Poisson
structures of compact types (PMCTs). In this paper, we focus on regular PMCTs,
exhibiting a rich transverse geometry. We show that their leaf spaces are
integral affine orbifolds. We prove that the cohomology class of the leafwise
symplectic form varies linearly and that there is a distinguished polynomial
function describing the leafwise sympletic volume. The leaf space of a PMCT
carries a natural Duistermaat-Heckman measure and a Weyl type integration
formula holds. We introduce the notion of a symplectic gerbe, and we show that
they obstruct realizing PMCTs as the base of a symplectic complete isotropic
fibration (a.k.a. a non-commutative integrable system).


title:
Continuous variables quantum computation over the vibrational modes of a
  single trapped ion

abstract:
  We consider the quantum processor based on a chain of trapped ions to propose
an architecture wherein the motional degrees of freedom of trapped ions
(position and momentum) could be exploited as the computational Hilbert space.
We adopt a continuous-variables approach to develop a toolbox of quantum
operations to manipulate one or two vibrational modes at a time. Together with
the intrinsic non-linearity of the qubit degree of freedom, employed to mediate
the interaction between modes, arbitrary manipulation and readout of the ionic
wave function could be achieved.


title:
Repeatability of measurements: Equivalence of hermitian and
  non-hermitian observables

abstract:
  A non-commuting measurement transfers, via the apparatus, information encoded
in a system's state to the external "observer". Classical measurements
determine properties of physical objects. In the quantum realm, the very same
notion restricts the recording process to orthogonal states as only those are
distinguishable by measurements. Therefore, even a possibility to describe
physical reality by means of non-hermitian operators should \emph{volens
nolens} be excluded as their eigenstates are not orthogonal. Here, we show that
non-hermitian operators with real spectrum can be treated within the standard
framework of quantum mechanics. Furthermore, we propose a quantum canonical
transformation that maps hermitian systems onto non-hermitian ones. Similar to
classical inertial forces this transformation is accompanied by an energetic
cost pinning the system on the unitary path.


title:
On bound-states of the Gross Neveu model with massive fundamental
  fermions

abstract:
  In the search for QFT's that admit boundstates, we reinvestigate the two
dimensional Gross-Neveu model, but with massive fermions. By computing the
self-energy for the auxiliary boundstate field and the effective potential, we
show that there are no bound states around the lowest minimum, but there is a
meta-stable bound state around the other minimum, a local one. The latter
decays by tunneling. We determine the dependence of its lifetime on the fermion
mass and coupling constant.


title:
Application of the Maximum relative Entropy method to the physics of
  ferromagnetic materials

abstract:
  It is known that the Maximum relative Entropy (MrE) method can be used to
both update and approximate probability distributions functions in statistical
inference problems. In this manuscript, we apply the MrE method to infer
magnetic properties of ferromagnetic materials. In addition to comparing our
approach to more traditional methodologies based upon the Ising model and Mean
Field Theory, we also test the effectiveness of the MrE method on
conventionally unexplored ferromagnetic materials with defects.


title: Tukey depth: linear programming and applications

abstract:
  Determining the representativeness of a point within a data cloud has
recently become a desirable task in multivariate analysis. The concept of
statistical depth function, which reflects centrality of an arbitrary point,
appears to be useful and has been studied intensively during the last decades.
Here the issue of exact computation of the classical Tukey data depth is
addressed. The paper suggests an algorithm that exploits connection between the
Tukey depth and linear separability and is based on iterative application of
linear programming. The algorithm further develops the idea of the cone
segmentation of the Euclidean space and allows for efficient implementation due
to the special search structure. The presentation is complemented by
relationship to similar concepts and examples of application.


title:
Emergent interacting spin islands in a depleted strong-leg Heisenberg
  ladder

abstract:
  Properties of the depleted Heisenberg spin ladder material series
(C$_7$H$_{10}$N)$_2$Cu$_{1-z}$Zn$_{z}$Br$_4$ have been studied by the
combination of magnetic measurements and neutron spectroscopy. Disorder-induced
degrees of freedom lead to a specific magnetic response, described in terms of
emergent strongly interacting "spin island" objects. The structure and dynamics
of the spin islands is studied by high-resolution inelastic neutron scattering.
This allows to determine their spatial shape and to observe their mutual
interactions, manifested by strong spectral in-gap contributions.


title: Computing resolutions of quotient singularities

abstract:
  Let $G\subseteq GL(n)$ be a finite group without pseudo-reflections. We
present an algorithm to compute and verify a candidate for the Cox ring of a
resolution $X\rightarrow \mathbb{C}^n/G$, which is based just on the geometry
of the singularity $\mathbb{C}^n/G$, without further knowledge of its
resolutions. We explain the use of our implementation of the algorithms in
Singular. As an application, we determine the Cox rings of resolutions
$X\rightarrow \mathbb{C}^3/G$ for all $G\subseteq GL(3)$ with the
aforementioned property and of order $|G|\leq 12$. We also provide examples in
dimension 4.


title: Gyrotropic skyrmion modes in ultrathin magnetic circular dots

abstract:
  We calculate low-frequency gyrotropic spin excitation modes of the skyrmion
ground state ultrathin cylindrical magnetic dots. The skyrmion is assumed to be
stabilized at room temperature and zero external magnetic field due to an
interplay of the isotropic and Dzyaloshinskii-Moriya exchange interactions,
perpendicular magnetic anisotropy and magnetostatic interaction. We consider
Bloch- and Neel-type magnetic skyrmions and assume that the dot magnetization
does not depend on the thickness coordinate. The skyrmion gyrotropic
frequencies are calculated in GHz range as a function of the skyrmion
equilibrium radius, dot radius and the dot magnetic parameters. Recent
experiments on magnetic skyrmion gyrotropic dynamics in nanodots are discussed.


title:
$\mathcal{W}$-algebra constraints and topological recursion for
  $A_N$-singularity

abstract:
  We derive a Bouchard--Eynard type topological recursion for the total
descendant potential of $A_N$-singularity. Our argument relies on a certain
twisted representation of a Heisenberg Vertex Operator Algebra (VOA)
constructed via the periods of $A_N$-singularity. In particular, our approach
allows us to prove that the topological recursion for the total descendant
potential is equivalent to a certain generating set of $\mathcal{W}$-algebra
constraints.


title: Modeling the Infectiousness of Twitter Hashtags

abstract:
  This study applies dynamical and statistical modeling techniques to quantify
the proliferation and popularity of trending hashtags on Twitter. Using
time-series data reflecting actual tweets in New York City and San Francisco,
we present estimates for the dynamics (i.e., rates of infection and recovery)
of several hundred trending hashtags using an epidemic modeling framework
coupled with Bayesian Markov Chain Monte Carlo (MCMC) methods. This
methodological strategy is an extension of techniques traditionally used to
model the spread of infectious disease. We demonstrate that in some models,
hashtags can be grouped by infectiousness, possibly providing a method for
quantifying the trendiness of a topic.


title:
Analytical and Numerical Study of Gauss-Bonnet Holographic
  Superconductors with Power-Maxwell Field

abstract:
  We provide an analytical as well as a numerical study of the holographic
$s$-wave superconductors in Gauss-Bonnet gravity with Power-Maxwell
electrodynamics. We limit our study to the case where scalar and gauge fields
do not have an effect on the background metric. We use a variational method,
based on Sturm-Liouville eigenvalue problem for our analytical study, as well
as a numerical shooting method in order to compare with our analytical results.
Interestingly enough, we observe that unlike Born-Infeld-like nonlinear
electrodynamics which decrease the critical temperature compared to the linear
Maxwell field, the Power-Maxwell electrodynamics is able to increase the
critical temperature of the holographic superconductors in the sublinear
regime. We find that requiring the finite value for the gauge field on the
asymptotic boundary $r\rightarrow \infty$, restricts the power parameter, $q$,
of the Power-Maxwell field to be in the range $1/2<q<{(d-1)}/{2}$. Our study
indicates that it is quite possible to make condensation \emph{easier} as $q$
\emph{decreases} in its allowed range. We also find that for all values of $q$,
the condensation can be affected by the Gauss-Bonnet coefficient $\alpha$.
However, the presence of the Gauss-Bonnet term makes the transition slightly
harder. Finally, we obtain an analytic expression for the order parameter and
thus obtain the associated critical exponent near the phase transition. We find
that the critical exponent has its universal value of $\beta=1/2$ regardless of
the parameters $q$, $\alpha$ as well as dimension $d$, consistent with
mean-field values obtained in previous studies.


title: Logarithmic laws and unique ergodicity

abstract:
  We show that Masur's logarithmic law of geodesics in the moduli space of
translation surfaces does not imply unique ergodicity of the translation flow,
but that a similar law involving the flat systole of a Teichm\"{u}ller geodesic
does imply unique ergodicity. It shows that the flat geometry has a better
control on ergodic properties of translation flow than hyperbolic geometry.