title:
Quantitative Chemically-Specific Coherent Diffractive Imaging of Buried
  Interfaces using a Tabletop EUV Nanoscope

abstract:
  Characterizing buried layers and interfaces is critical for a host of
applications in nanoscience and nano-manufacturing. Here we demonstrate
non-invasive, non-destructive imaging of buried interfaces using a tabletop,
extreme ultraviolet (EUV), coherent diffractive imaging (CDI) nanoscope. Copper
nanostructures inlaid in SiO2 are coated with 100 nm of aluminum, which is
opaque to visible light and thick enough that neither optical microscopy nor
atomic force microscopy can image the buried interfaces. Short wavelength (29
nm) high harmonic light can penetrate the aluminum layer, yielding
high-contrast images of the buried structures. Moreover, differences in the
absolute reflectivity of the interfaces before and after coating reveal the
formation of interstitial diffusion and oxidation layers at the Al-Cu and
Al-SiO2 boundaries. Finally, we show that EUV CDI provides a unique capability
for quantitative, chemically-specific imaging of buried structures, and the
material evolution that occurs at these buried interfaces, compared with all
other approaches.


title:
$B^{0}_{s}$ lifetime measurement in the CP-odd decay channel $B^{0}_{s}
  \to J/\psi\mbox{ }f_{0}(980)$

abstract:
  The lifetime of the $B^{0}_{s}$ meson is measured in the decay channel
$B^{0}_{s} \to J/\psi\mbox{ }\pi^+ \pi^-$ with $880 \leq M_{\pi^+\pi^-} \leq
1080$ MeV/$c^2$, which is mainly a CP-odd state and dominated by the
$f_{0}(980)$ resonance. In 10.4 fb$^{-1}$ of data collected with the D0
detector in Run II of the Tevatron, the lifetime of the $B^{0}_{s}$ meson is
measured to be $\tau(B^{0}_{s}) = 1.70\pm 0.14 \mbox{ (stat)} \pm 0.05 \mbox{
(syst) ps}$. Neglecting CP violation in $B_s^0/\bar{B}_s^0$ mixing, the
measurement can be translated into the width of the heavy mass eigenstate of
the $B^0_s$, $\Gamma_H = 0.59 \pm 0.05 \mbox{ (stat)} \pm 0.02 \mbox{ (syst)}
\mbox{ ps$^{-1}$}$.


title:
An End-to-End Robot Architecture to Manipulate Non-Physical State
  Changes of Objects

abstract:
  With the advance in robotic hardware and intelligent software, humanoid robot
plays an important role in various tasks including service for human assistance
and heavy job for hazardous industry. Recent advances in task learning enable
humanoid robots to conduct dexterous manipulation tasks such as grasping
objects and assembling parts of furniture. Operating objects without physical
movements is an even more challenging task for humanoid robot because effects
of actions may not be clearly seen in the physical configuration space and
meaningful actions could be very complex in a long time horizon. As an example,
playing a mobile game in a smart device has such challenges because both swipe
actions and complex state transitions inside the smart devices in a long time
horizon. In this paper, we solve this problem by introducing an integrated
architecture which connects end-to-end dataflow from sensors to actuators in a
humanoid robot to operate smart devices. We implement our integrated
architecture in the Baxter Research Robot and experimentally demonstrate that
the robot with our architecture could play a challenging mobile game, the 2048
game, as accurate as in a simulated environment.


title:
Comment on Half metallicity along the edge of zigzag boron nitride
  nanoribbons (Phys. Rev. B 78, 205415 (2008)

abstract:
  We would like to comment that the prediction of Half-mtallicity in only B
edge H-passivated zigzag boron nitride nanoribbons (ZBNNR-BH), by Zheng et
al.1, is not correct as their interpretation is erroneous. Since it is well
known that for a material, to be a half-metal, as a primary condition one type
of spin channels or bands (either spin up or spin down) are conducting and the
opposite ones are insulating. In commented article 1, ZBNNR-BH shows insulating
behavior for spin up bands (Eg=4.5 eV) whereas conducting nature for spin down
electrons. They claim1 through the electronic band structure of 8-ZBNNR-BH [as
shown in figure 2 (b)]1, that spin down - Alpha (conduction band minimum - CBM)
and Beta (valence band maximum - VBM) bands are crossing each other at the
Fermi level (green dotted line) and thus the ribbons are conducting for spin
down electrons. But this crossing of two same spin bands is impossible because
according to well-known Paulis exclusion principle- Two identical fermions
(particles with half-integer spin) cannot occupy the same quantum state
simultaneously.In the case of electrons, it is impossible for two electrons of
a poly-electron atom to have the same values of the four quantum numbers (n, l,
ml and ms). Thus for two electrons residing in the same orbital (same energy
level e.g. above stated crossing point 1), n, l, and ml are the same, so ms
must be different and the electrons must have opposite spins.


title: "Half a proton" in the Bogomol'nyi-Prasad-Sommerfield Skyrme model

abstract:
  The BPS Skyrme model is a model containing an $SU(2)$-valued scalar field, in
which a Bogomol'nyi-type inequality can be satisfied by soliton solutions. In
this model, the energy density of static configurations is the sum of the
square of the topological charge density plus a potential. The topological
charge density is nothing else but the pull-back of the Haar measure of the
group $SU(2)$ on the physical space by the field configuration. As a
consequence, this energy expression has a high degree of symmetry: it is
invariant to volume preserving diffeomorphisms both on physical space and on
the target space. We demonstrate here, that in the BPS Skyrme model such
solutions exists, that a fraction of their charge and energy densities are
localised, and the remaining part can be any far away, not interacting with the
localised part.


title: Zeros of certain combinations of Eisenstein series

abstract:
  We prove that if $k$ and $\ell$ are sufficiently large, then all the zeros of
the weight $k+\ell$ cusp form $E_k(z) E_{\ell}(z) - E_{k+\ell}(z)$ in the
standard fundamental domain lie on the boundary. We moreover find formulas for
the number of zeros on the bottom arc with $|z|=1$, and those on the sides with
$x = \pm 1/2$. One important ingredient of the proof is an approximation of the
Eisenstein series in terms of the Jacobi theta function.


title: Thermal Diffusion Boron Doping of Single-Crystal Diamond

abstract:
  With the best overall electronic and thermal properties, single crystal
diamond (SCD) is the extreme wide bandgap material that is expected to
revolutionize power electronics and radio-frequency electronics in the future.
However, turning SCD into useful semiconductors requires overcoming doping
challenges, as conventional substitutional doping techniques, such as thermal
diffusion and ion implantation, are not easily applicable to SCD. Here we
report a simple and easily accessible doping strategy demonstrating that
electrically activated, substitutional doping in SCD without inducing
graphitization transition or lattice damage can be readily realized with
thermal diffusion at relatively low temperatures by using heavily doped Si
nanomembranes as a unique dopant carrying medium. Atomistic simulations
elucidate a vacancy exchange boron doping mechanism that occur at the bonded
interface between Si and diamond. We further demonstrate selectively doped high
voltage diodes and half-wave rectifier circuits using such doped SCD. Our new
doping strategy has established a reachable path toward using SCDs for future
high voltage power conversion systems and for other novel diamond based
electronic devices. The novel doping mechanism may find its critical use in
other wide bandgap semiconductors.


title: Dynamic Adaptive Mixture Models

abstract:
  In this paper we propose a new class of Dynamic Mixture Models (DAMMs) being
able to sequentially adapt the mixture components as well as the mixture
composition using information coming from the data. The information driven
nature of the proposed class of models allows to exactly compute the full
likelihood and to avoid computer intensive simulation schemes. An extensive
Monte Carlo experiment reveals that the new proposed model can accurately
approximate the more complicated Stochastic Dynamic Mixture Model previously
introduced in the literature as well as other kind of models. The properties of
the new proposed class of models are discussed through the paper and an
application in financial econometrics is reported.


title:
Magnetic-Island Contraction and Particle Acceleration in Simulated
  Eruptive Solar Flares

abstract:
  The mechanism that accelerates particles to the energies required to produce
the observed high-energy impulsive emission in solar flares is not well
understood. Drake et al. (2006) proposed a mechanism for accelerating electrons
in contracting magnetic islands formed by kinetic reconnection in multi-layered
current sheets. We apply these ideas to sunward-moving flux ropes (2.5D
magnetic islands) formed during fast reconnection in a simulated eruptive
flare. A simple analytic model is used to calculate the energy gain of
particles orbiting the field lines of the contracting magnetic islands in our
ultrahigh-resolution 2.5D numerical simulation. We find that the estimated
energy gains in a single island range up to a factor of five. This is higher
than that found by Drake et al. for islands in the terrestrial magnetosphere
and at the heliopause, due to strong plasma compression that occurs at the
flare current sheet. In order to increase their energy by two orders of
magnitude and plausibly account for the observed high-energy flare emission,
the electrons must visit multiple contracting islands. This mechanism should
produce sporadic emission because island formation is intermittent. Moreover, a
large number of particles could be accelerated in each
magnetohydrodynamic-scale island, which may explain the inferred rates of
energetic-electron production in flares. We conclude that island contraction in
the flare current sheet is a promising candidate for electron acceleration in
solar eruptions.


title:
Relaxation and optimization for linear-growth convex integral
  functionals under PDE constraints

abstract:
  We give necessary and sufficient conditions for minimality of generalized
minimizers for linear-growth functionals of the form \[ \mathcal F[u] :=
\int_\Omega f(x,u(x)) \, \text{d}x, \qquad u:\Omega \subset \mathbb R^N\to
\mathbb R^d, \] where $u$ is an integrable function satisfying a general PDE
constraint. Our analysis is based on two ideas: a relaxation argument into a
subspace of the space of bounded vector-valued Radon measures $\mathcal
M(\Omega;\mathbb R^d)$, and the introduction of a set-valued pairing in
$\mathcal M(\Omega;\mathbb R^N) \times {\rm L}^\infty(\Omega;\mathbb R^N)$. By
these means we are able to show an intrinsic relation between minimizers of the
relaxed problem and maximizers of its dual formulation also known as the
saddle-point conditions. In particular, our results can be applied to
relaxation and minimization problems in BV, BD.


title:
The Fenchel-type inequality in the 3-dimensional Lorentz space and a
  Crofton formula

abstract:
  We generalize the Fenchel theorem to strong spacelike (which means that the
tangent vector and the curvature vector span a spacelike 2-plane at each point)
closed curves with index 1 in the 3-dimensional Lorentz space, showing that the
total curvatures must be less than or equal to $2\pi$. A similar generalization
of the Fary-Milnor theorem is also obtained. We establish the Crofton formula
on the de Sitter 2-sphere which implies the above results.


title: Learning Physical Intuition of Block Towers by Example

abstract:
  Wooden blocks are a common toy for infants, allowing them to develop motor
skills and gain intuition about the physical behavior of the world. In this
paper, we explore the ability of deep feed-forward models to learn such
intuitive physics. Using a 3D game engine, we create small towers of wooden
blocks whose stability is randomized and render them collapsing (or remaining
upright). This data allows us to train large convolutional network models which
can accurately predict the outcome, as well as estimating the block
trajectories. The models are also able to generalize in two important ways: (i)
to new physical scenarios, e.g. towers with an additional block and (ii) to
images of real wooden blocks, where it obtains a performance comparable to
human subjects.


title:
FastCap: An Efficient and Fair Algorithm for Power Capping in Many-Core
  Systems

abstract:
  Future servers will incorporate many active lowpower modes for different
system components, such as cores and memory. Though these modes provide
flexibility for power management via Dynamic Voltage and Frequency Scaling
(DVFS), they must be operated in a coordinated manner. Such coordinated control
creates a combinatorial space of possible power mode configurations. Given the
rapid growth of the number of cores, it is becoming increasingly challenging to
quickly select the configuration that maximizes the performance under a given
power budget. Prior power capping techniques do not scale well to large numbers
of cores, and none of those works has considered memory DVFS. In this paper, we
present FastCap, our optimization approach for system-wide power capping, using
both CPU and memory DVFS. Based on a queuing model, FastCap formulates power
capping as a non-linear optimization problem where we seek to maximize the
system performance under a power budget, while promoting fairness across
applications. Our FastCap algorithm solves the optimization online and
efficiently (low complexity on the number of cores), using a small set of
performance counters as input. To evaluate FastCap, we simulate it for a
many-core server running different types of workloads. Our results show that
FastCap caps power draw accurately, while producing better application
performance and fairness than many existing CPU power capping methods (even
after they are extended to use of memory DVFS as well).


title: New views on classical and quantum Brans-Dicke theory

abstract:
  The Brans-Dicke action is one of the most natural extensions of the
Einstein-Hilbert action. It is based on the introduction of a fundamental
scalar field that effectively incorporates a dynamics to the gravitational
coupling $G$. In spite of the diverse motivations and the rich phenomenology
that comes from its solutions, Solar System tests impose strong constraints on
the Brans-Dicke theory, rendering it indistinguishable from General Relativity.
In the present text, new perspectives for the Brans-Dicke theory are presented,
based on the possibility that the scalar field presented in the BD theory can
be external, as well as on the applications to black hole physics and the
primordial universe.


title: Ecology-Based DoS Attack in Cognitive Radio Networks

abstract:
  Cognitive radio technology, which is designed to enhance spectrum
utilization, depends on the success of opportunistic access, where secondary
users (SUs) exploit spectrum void unoccupied by primary users (PUs) for
transmissions. We note that the system behaviors are very similar to the
interactions among different species coexisting in an ecosystem. However, SUs
of a selfish nature or of misleading information may make concurrent
transmissions with PUs for additional incentives, and thus disrupt the entire
ecosystem. By exploiting this vulnerability, this paper proposes a novel
distributed denial-of-service (DoS) attack where invasive species, i.e.,
malicious users (MUs), induce originally normal-behaved SUs to execute
concurrent transmissions with PUs and thus collapse the cognitive radio
network. We adopt stochastic geometry to model the spatial distributions of
PUs, SUs, and MUs for the analysis of the mutual interference among them. The
access strategy of each SU in the spectrum sharing ecosystem, which evolves
with the experienced payoffs and interference, is modeled by an evolutionary
game. Based on the evolutionary stable strategy concept, we could efficiently
identify the fragile operating region at which normal-behaved SUs are
eventually evolved to conduct concurrent transmissions and thus to cause the
ruin of the network.


title:
Performance Assessment of WhatsApp and IMO on Android Operating System
  (Lollipop and KitKat) during VoIP calls using 3G or WiFi

abstract:
  This paper assesses the performance of mobile messaging and VoIP connections.
We investigate the CPU usage of WhatsApp and IMO under different scenarios.
This analysis also enabled a comparison of the performance of these
applications on two Android operating system (OS) versions: KitKat or Lollipop.
Two models of smartphones were considered, viz. Galaxy Note 4 and Galaxy S4.
The applications behavior was statistically investigated for both sending and
receiving VoIP calls. Connections have been examined over 3G and WiFi. The
handset model plays a decisive role in CPU usage of the application. t-tests
showed that IMO has a better performance that WhatsApp whatever be the Android
at a significance level 1%, on Galaxy Note 4. In contrast, WhatsApp requires
less CPU than IMO on Galaxy S4 whatever be the OS and access (3G/WiFi). Galaxy
Note 4 using WiFi always outperformed S4 in terms of processing efficiency.


title:
The 2010 and 2014 floods in India and Pakistan: dynamical influences on
  vertical motion and precipitation

abstract:
  Devastating floods in northeast Pakistan and northern India occurred in July
2010 and September 2014 as a consequence of extreme precipitation events. The
2010 and 2014 flood events had similar synoptic flow patterns that led to an
anomalously high moisture content in the flood region. The quasi-geostrophic
omega equation is inverted in order to attribute components of the large-scale
vertical motion profile to synoptic forcing, diabatic heating, and mechanically
forced orographic ascent. The results show that diabatic heating is the
dominant contributor to the large-scale vertical motion, and suggest that the
orographic forcing by flow over the Himalayas is the dominant mechanism by
which the convection that produces the heating is forced. Analysis of a longer
data record shows that instances of extreme precipitation in this region over
the last eleven years are closely associated with simultaneously large values
of orographic forcing and column-total precipitable water vapor.


title:
Efficiently characterizing games consistent with perturbed equilibrium
  observations

abstract:
  We study the problem of characterizing the set of games that are consistent
with observed equilibrium play. Our contribution is to develop and analyze a
new methodology based on convex optimization to address this problem for many
classes of games and observation models of interest. Our approach provides a
sharp, computationally efficient characterization of the extent to which a
particular set of observations constrains the space of games that could have
generated them. This allows us to solve a number of variants of this problem as
well as to quantify the power of games from particular classes (e.g., zero-sum,
potential, linearly parameterized) to explain player behavior. We illustrate
our approach with numerical simulations.


title:
Sensitivity of the fusion cross section to the density dependence of the
  symmetry energy

abstract:
  It is the aim of this paper to discuss the impact of nuclear fusion on the
EOS. This is a timely subject given the expected availability of increasingly
exotic beams at rare isotope facilities\,\cite{balantekin2014}. In practice, we
focus on $^{48}$Ca+$^{48}$Ca fusion. We employ three different approaches to
calculate fusion cross-sections for a set of energy density functionals with
systematically varying nuclear matter properties. Fusion calculations are
performed using frozen densities, using a dynamic microscopic method based on
density-constrained time-dependent Hartree-Fock (DC-TDHF) approach, as well as
direct TDHF study of above barrier cross-sections. For these studies, we employ
a family of Skyrme parametrizations with systematically varied nuclear matter
properties. We find a slight preference for forces which deliver a slope of
symmetry energy of $L\approx 50$\,MeV that corresponds to a neutron-skin
thickness of $^{48}$Ca of $R_\mathrm{skin}\!=\!(0.180\!-\!0.210)$\,fm.


title:
Stochastic Boltzmann Equation for Magnetic Relaxation in High-Spin
  Molecules

abstract:
  We introduce the stochastic Boltzmann equation (SBE) as an approach for
exploring the spin dynamics of magnetic molecules coupled to a stochastic
environment. The SBE is a time-evolution equation for the probability density
of the spin density matrix of the system. This probability density is relevant
to experiments which take measurements on single molecules, in which
probabilities of observing particular spin states (rather than ensemble
averages) are of interest. By analogy with standard treatments of the regular
Boltzmann equation, we propose a relaxation-time approximation for the SBE, and
show that solutions to the SBE under the relaxation-time approximation can be
obtained by performing simple trajectory simulations for the case of a boson
gas environment. Cases where the relaxation-time approximation are satisfied
can therefore be investigated by careful choice of the parameters for the boson
gas environment, even if the actual environment is quite different from a boson
gas. The application of the SBE approach is demonstrated through an
illustrative example.


title:
Fringe-locking method for the weak equivalence principle test by
  simultaneous dual-species atom interferometers

abstract:
  We theoretically investigate the application of the fringe-locking method
(FLM) in the dual-species quantum test of the weak equivalence principle (WEP).
With the FLM, the measurement is performed invariably at the midfringe, and the
extraction of the phase shift for atom interferometers is linearized. For the
simultaneous interferometers, this linearization enables a good common-mode
rejection of vibration noise, which is usually the main limit for high
precision WEP tests of dual-species kind. We note that this method also allows
for an unbiased determination of the gravity accelerations difference, which
meanwhile is readily to be implemented.


title: Effects of Angular Momentum on Halo Profiles

abstract:
  The near universality of DM halo density profiles provided by N-body
simulations has proven to be robust against changes in total mass density,
power spectrum, and some forms of initial velocity dispersion. In this letter
we study the effects of coherently spinning up an isolated DM-only progenitor
on halo structure. Halos with spins within several standard deviations of the
simulated mean ($\lambda \lesssim 0.20$) produce profiles with negligible
deviations from the universal form. Only when the spin becomes quite large
($\lambda \gtrsim 0.20$) do departures become evident. The angular momentum
distribution also exhibits a near universal form, which is also independent of
halo spin up to $\lambda \lesssim 0.20$. A correlation between these epidemic
profiles and the presence of a strong bar in the virialized halo is also
observed. These bar structures bear resemblance to the radial orbit instability
in the rotationless limit.


title:
Switching of both local ferroelectric and magnetic domains in
  multiferroic Bi0.9La0.1FeO3 thin film by mechanical force

abstract:
  Cross-coupling of ordering parameters in multiferroic materials by multiple
external stimuli other than electric field and magnetic field is highly
desirable from both practical application and fundamental study points of view.
Recently, mechanical force has attracted great attention in switching of
ferroic ordering parameters via electro-elastic coupling in ferroelectric
materials. In this work, mechanical force induced polarization and
magnetization switching were investigated in a polycrystalline multiferroic
Bi0.9La0.1FeO3 thin film using a scanning probe microscopy system. The
piezoresponse force microscopy and magnetic force microscopy responses suggest
that both the ferroelectric domains and the magnetic domains in Bi0.9La0.1FeO3
film could be switched by mechanical force as well as electric field. High
strain gradient created by mechanical force is demonstrated as able to induce
ferroelastic switching and thus induce both ferroelectric dipole and magnetic
spin flipping in our thin film, as a consequence of electro-elastic coupling
and magneto-electric coupling. The demonstration of mechanical force control of
both the ferroelectric and the magnetic domains at room temperature provides a
new freedom for manipulation of multiferroics and could result in devices with
novel functionalities.


title: Compressed Sensing for Tactile Skins

abstract:
  Whole body tactile perception via tactile skins offers large benefits for
robots in unstructured environments. To fully realize this benefit, tactile
systems must support real-time data acquisition over a massive number of
tactile sensor elements. We present a novel approach for scalable tactile data
acquisition using compressed sensing. We first demonstrate that the tactile
data is amenable to compressed sensing techniques. We then develop a solution
for fast data sampling, compression, and reconstruction that is suited for
tactile system hardware and has potential for reducing the wiring complexity.
Finally, we evaluate the performance of our technique on simulated tactile
sensor networks. Our evaluations show that compressed sensing, with a
compression ratio of 3 to 1, can achieve higher signal acquisition accuracy
than full data acquisition of noisy sensor data.


title:
The imprint of $f(R)$ gravity on weak gravitational lensing I:
  Connection between observables and large scale structure

abstract:
  We study the effect of $f(R)$ gravity on the statistical properties of
various large-scale structures which can be probed in weak gravitational
lensing measurements. A set of ray-tracing simulations of gravitational lensing
in $f(R)$ gravity enables us to explore cosmological information on (i)
stacking analyses of weak lensing observables and (ii) peak statistics in
reconstructed lensing mass maps. For the $f(R)$ model proposed by Hu \&
Sawicki, the measured lensing signals of dark matter haloes in the stacking
analysis would show a $\simlt10\%$ difference between the standard $\Lambda$CDM
and the $f(R)$ model when the additional degree of freedom in $f(R)$ model
would be $|f_{\rm R0}|\sim10^{-5}$. Among various large-scale structures to be
studied in stacking analysis, troughs, i.e, underdensity regions in projected
plane of foreground massive haloes, could be promising to constrain the model
with $|f_{\rm R0}|\sim10^{-5}$, while stacking analysis around voids is found
to be difficult to improve the constraint of $|f_{\rm R0}|$ even in future
lensing surveys with a sky coverage of $\sim1000$ square degrees. On the peak
statistics, we confirm the correspondence between local maxima and dark matter
haloes along the line of sight, regardless of the modification of gravity in
our simulation. Thus, the number count of high significance local maxima would
be useful to probe the mass function of dark matter haloes even in the $f(R)$
model with $|f_{\rm R0}|\simlt10^{-5}$. We also find that including local
minima in lensing mass maps would be helpful to improve the constant on $f(R)$
gravity down to $|f_{\rm R0}|=10^{-5}$ in ongoing weak lensing surveys.


title: A generalization of intertwining operators for vertex operator algebras

abstract:
  We generalize the notion of an intertwining operator to N-graded weak modules
over a vertex operator algebra and study their properties. We show a formula
for the dimensions of these intertwining operators in terms of modules over the
Zhu algebras under some conditions on N-graded weak modules.


title: Quantization of Hitchin integrable system via positive characteristic

abstract:
  In a celebrated unpublished manuscript Beilinson and Drinfeld quantize the
Hitchin integrable system by showing that the global sections of critically
twisted differential operators on the moduli stack of G-bundles on an algebraic
curve is identified with the ring of regular functions on the space of G-opers;
they deduce existence of an automorphic D-module corresponding to a local
system carrying a structure of an oper. In this note we show for G=GL(n) that
those results admit a short proof by reduction to positive characteristic,
where the result is deduced from generic Langlands duality established earlier
by the first author and A. Braverman. The appendix contains a proof of some
properties of the p-curvature map restricted to the space of opers.


title:
Statistical mechanics of clonal expansion in lymphocyte networks
  modelled with slow and fast variables

abstract:
  We study the Langevin dynamics of the adaptive immune system, modelled by a
lymphocyte network in which the B cells are interacting with the T cells and
antigen. We assume that B clones and T clones are evolving in different thermal
noise environments and on different timescales. We derive stationary
distributions and use statistical mechanics to study clonal expansion of B
clones in this model when the B and T clone sizes are assumed to be the slow
and fast variables respectively and vice versa. We derive distributions of B
clone sizes and use general properties of ferromagnetic systems to predict
characteristics of these distributions, such as the average B cell
concentration, in some regimes where T cells can be modelled as binary
variables. This analysis is independent of network topologies and its results
are qualitatively consistent with experimental observations. In order to obtain
full distributions we assume that the network topologies are random and locally
equivalent to trees. The latter allows us to employ the Bethe-Peierls approach
and to develop a theoretical framework which can be used to predict the
distributions of B clone sizes. As an example we use this theory to compute
distributions for the models of immune system defined on random regular
networks.


title:
Doppler shift generated by a moving diffraction grating under incidence
  by polychromatic diffuse light

abstract:
  We consider the spectral response of moving diffraction gratings, in which
the incident light extends over a broad angular range and where the diffracted
light is observed from a specific angle. We show that the dispersion relation
between the frequency perceived by an observer who is looking at a moving
grating and the incident frequency can exhibit some unique features, such as a
flat band (i.e., a local minimum). An observer can see the light diffracted
into a non-specular diffraction order from a multitude of incident light rays
and the angle of incidence of each ray is frequency-dependent, as a
consequence, when the grating is moving, each incident ray experiences a
Doppler shift in frequency that depends on its angle of incidence. We find that
remarkable features appear near a Wood anomaly where the angle of incidence,
for a given diffraction angle, can change very quickly with frequency. This
means that light of multiple frequencies and incident from multiple angles can
be mixed by the motion of the grating into the same diffracted ray and their
frequencies can be compressed into a narrower range. The existence of a flat
band means that a moving grating can be used as a device to increase the
intensity of the perceived diffracted light due to spectral compression. The
properties of a grating in motion in sunlight can also be relevant to the study
of naturally occurring gratings which are typically in oscillatory motion.


title:
Topological phases and Majorana states in screened interacting quantum
  wires

abstract:
  We study theoretically the effects of long-range and on-site Coulomb
interactions on the topological phases and transport properties of
spin-orbit-coupled quasi-one-dimensional quantum wires imposed on an s-wave
superconductor. The electrostatic potential and charge density distributions
are computed self-consistently within the Hartree approximation. Due to the
finite width of the wires and the charge repulsion, the potential and density
distribute inhomogeneously in the transverse direction and tend to accumulate
along the lateral edges where the hard-wall confinement is assumed. This result
has profound effects on the topological phases and the differential conductance
of the interacting quantum wires and their hybrid junctions with
superconductors. Coulomb interactions renormalize the chemical potential, and
alter the topological phases strongly by enhancing the topological regimes and
producing jagged boundaries. Moreover, the multicritical points connecting
different topological phases from high-index subbands are modified remarkably
in striking contrast to the predictions of the two-band model. We further
suggest the possible non-magnetic topological phase transitions manipulated
externally with the aid of long-range interactions. Finally, the transport
properties of normal-superconductor junctions are also examined and interaction
impacts on the emergence of Majorana fermions and the strength of Majorana
zero-bias peaks are revealed.


title: Hypergraphs with high projective dimension and 1-dimensional Hypergraphs

abstract:
  We prove a sufficient and a necessary condition for a square-free monomial
ideal $J$ associated to a (dual) hypergraph to have projective dimension equal
to the minimal number of generators of $J$ minus 2. We also provide an
effective explicit procedure to compute the projective dimension of
1-dimensional hypergraphs $\mathcal{H}$ when each connected component contains
at most one cycle. An algorithm to compute the projective dimension is also
included. Applications of these results are given; they include, for instance,
computing the projective dimension of monomial ideals whose associated
hypergraph has a spanning Ferrers graph.


title: Torsion as a Gauge Field in a Lorentz-Chern-Simons Theory

abstract:
  We explore a model of gravity that arises from the consideration of the
Chern-Simons form in 2+1 dimensions for a spin connection with a contorsion
described by a scalar and a vector field. The effective Lagrangian presents a
local Weyl symmetry allowing us to gauge the scalar field to a constant value.
From a gauge field theory perspective, it is shown that the vector part of the
torsion (related to its trace) is a gauge field for the Weyl group, which
allows the interpretation of the torsion as an electromagnetic field. In the
gauge of constant scalar field we obtain Chiral Gravity coupled to a
Chern-Simons-Proca theory for the vector field, that at the level of equations
of motion is equivalent to Topologically Massive Electrodynamics minimally
coupled to Chiral Gravity. Electrodynamics and gravity appear here unified as
geometrical features of a Riemann-Cartan manifold.


title: Joint Learning Templates and Slots for Event Schema Induction

abstract:
  Automatic event schema induction (AESI) means to extract meta-event from raw
text, in other words, to find out what types (templates) of event may exist in
the raw text and what roles (slots) may exist in each event type. In this
paper, we propose a joint entity-driven model to learn templates and slots
simultaneously based on the constraints of templates and slots in the same
sentence. In addition, the entities' semantic information is also considered
for the inner connectivity of the entities. We borrow the normalized cut
criteria in image segmentation to divide the entities into more accurate
template clusters and slot clusters. The experiment shows that our model gains
a relatively higher result than previous work.


title: Besov spaces on open sets

abstract:
  This paper is devoted to giving definitions of Besov spaces on an arbitrary
open set of $\mathbb R^n$ via the spectral theorem for the Schr\"odinger
operator with the Dirichlet boundary condition. The crucial point is to
introduce some test function spaces on $\Omega$. The fundamental properties of
Besov spaces are also shown, such as embedding relations and duality, etc.
Furthermore, the isomorphism relations are established among the Besov spaces
in which regularity of functions is measured by the Dirichlet Laplacian and the
Schr\"odinger operators.


title:
Where to be wary: The impact of widespread photo-taking and image
  enhancement practices on users' geo-privacy

abstract:
  Today's geo-location estimation approaches are able to infer the location of
a target image using its visual content alone. These approaches exploit visual
matching techniques, applied to a large collection of background images with
known geo-locations. Users who are unaware that visual retrieval approaches can
compromise their geo-privacy, unwittingly open themselves to risks of crime or
other unintended consequences. Private photo sharing is not able to protect
users effectively, since its inconvenience is a barrier to consistent use, and
photos can still fall into the wrong hands if they are re-shared. This paper
lays the groundwork for a new approach to geo-privacy of social images: Instead
of requiring a complete change of user behavior, we investigate the protection
potential latent in users existing practices. We carry out a series of
retrieval experiments using a large collection of social images (8.5M) to
systematically analyze where users should be wary, and how both photo taking
and editing practices impact the performance of geo-location estimation. We
find that practices that are currently widespread are already sufficient to
protect single-handedly the geo-location ('geo-cloak') up to more than 50% of
images whose location would otherwise be automatically predictable. Our
conclusion is that protecting users against the unwanted effects of visual
retrieval is a viable research field, and should take as its starting point
existing user practices.


title:
Simplified Relative Citation Ratio for Static Paper Ranking: UFMG/LATIN
  at WSDM Cup 2016

abstract:
  Static rankings of papers play a key role in the academic search setting.
Many features are commonly used in the literature to produce such rankings,
some examples are citation-based metrics, distinct applications of PageRank,
among others. More recently, learning to rank techniques have been successfully
applied to combine sets of features producing effective results. In this work,
we propose the metric S-RCR, which is a simplified version of a metric called
Relative Citation Ratio --- both based on the idea of a co-citation network.
When compared to the classical version, our simplification S-RCR leads to
improved efficiency with a reasonable effectiveness. We use S-RCR to rank over
120 million papers in the Microsoft Academic Graph dataset. By using this
single feature, which has no parameters and does not need to be tuned, our team
was able to reach the 3rd position in the first phase of the WSDM Cup 2016.


title:
Charge-multiplicity and collision-energy dependence of $p_t$ spectra
  from $p$-$p$ collisions at the relativistic heavy-ion collider and large
  hadron collider

abstract:
  A two-component (soft + hard) model (TCM) of hadron production in yields and
spectra derived from the charge-multiplicity dependence of 200 GeV p-p
collisions at the relativistic heavy ion collider (RHIC) is extended to
describe p-p spectrum data from the large hadron collider (LHC) up to 13 TeV.
The LHC data include spectrum ratios that provide only partial information on
the TCM. The LHC ratio method is applied to well-understood 200 GeV spectrum
data to derive an algebraic link between spectrum ratios and the full TCM. Some
aspects of the form of the hard component on transverse momentum are found to
be $n_{ch}$ dependent. LHC spectrum ratios are then analyzed to obtain $n_{ch}$
and collision-energy (over three orders of magnitude) dependence of isolated
soft and hard TCM spectrum components. The energy dependence of the spectrum
soft component is a new result suggesting a relation to Gribov diffusion. The
spectrum hard component varies simply and smoothly with $n_{ch}$ suggesting
bias of the underlying jet spectrum and linearly with QCD parameter
$\log(s/s_0)$, its properties consistent with minimum-bias reconstructed-jet
spectrum measurements.


title: Finding best possible constant for a polynomial inequality

abstract:
  Given a multi-variant polynomial inequality with a parameter, how to find the
best possible value of this parameter that satisfies the inequality? For
instance, find the greatest number $k$ that satisfies $ a^3+b^3+c^3+
k(a^2b+b^2c+c^2a)-(k+1)(ab^2+bc^2+ca^2)\geq 0 $ for all nonnegative real
numbers $ a,b,c $. Analogues problems often appeared in studies of inequalities
and were dealt with by various methods. In this paper, a general algorithm is
proposed for finding the required best possible constant. The algorithm can be
easily implemented by computer algebra tools such as Maple.


title:
Numerical analysis of the Oseen-type Peterlin viscoelastic model by the
  stabilized Lagrange-Galerkin method, Part I: A nonlinear scheme

abstract:
  We present a nonlinear stabilized Lagrange-Galerkin scheme for the Oseen-type
Peterlin viscoelastic model. Our scheme is a combination of the method of
characteristics and Brezzi-Pitk\"aranta's stabilization method for the
conforming linear elements, which yields an efficient computation with a small
number of degrees of freedom. We prove error estimates with the optimal
convergence order without any relation between the time increment and the mesh
size. The result is valid for both the diffusive and non-diffusive models for
the conformation tensor in two space dimensions. We introduce an additional
term that yields a suitable structural property and allows us to obtain
required energy estimate. The theoretical convergence orders are confirmed by
numerical experiments. In a forthcoming paper, Part II, a linear scheme is
proposed and the corresponding error estimates are proved in two and three
space dimensions for the diffusive model.


title:
OFDM demodulation using virtual time reversal processing in underwater
  acoustic communication

abstract:
  The extremely long underwater channel delay spread causes severe inter-symbol
interference (ISI) for underwater acoustic communications. Passive time
reversal processing (PTRP) can effectively reduce the channel time dispersion
in a simple way via convolving the received packet with a time reversed probe
signal. However the probe signal itself may introduce extra noise and
interference (self-correlation of the probe signal). In this paper, we propose
a virtual time reversal processing (VTRP) for single input single output (SISO)
Orthogonal Frequency Division Multiplexing (OFDM) systems. It convolves the
received packet with the reversed estimated channel, instead of the probe
signal to reduce the interference. Two sparse channel estimation methods,
matching pursuit (MP), and basis pursuit de-noising (BPDN), are adopted to
estimate the channel impulse response (CIR). We compare the performance of VTRP
with the PTRP and without any time reversal processing through MATLAB
simulations and the pool experiments. The results reveal that VTRP has
outstanding performance over time-invariant channels.


title:
Hong Kong -- Shanghai Connect / Hong Kong -- Beijing Disconnect (?):
  Scaling the Great Wall of Chinese Securities Trading Costs

abstract:
  We utilize a fundamentally different model of trading costs to look at the
effect of the opening of the Hong Kong Shanghai Connect that links the stock
exchanges in the two cities, arguably the biggest event in international
business and finance since Christopher Columbus set sail for India. We design a
novel methodology that compensates for the lack of data on trading costs in
China. We estimate trading costs across similar positions on the dual listed
set of securities in Hong Kong and China, hoping to provide useful pieces of
information to help scale 'The Great Wall of Chinese Securities Trading Costs'.
We then compare actual and estimated trading costs on a sample of real orders
across the Hong Kong securities in the dual listed pair to establish the
accuracy of our measurements. The primary question we seek to address is 'Which
market would be better to trade to gain exposure to the same (or similar) set
of securities or sectors?' We find that trading costs on Shanghai, which might
have been lower than Hong Kong, might have become higher leading up to the
Connect. What remains to be seen is whether this increase in trading costs is a
temporary equilibrium due to the frenzy to gain exposure to Chinese securities
or whether this phenomenon will persist once the two markets start becoming
more and more tightly coupled. It would be interesting to see if this
pioneering policy will lead to securities exchanges across the globe linking up
one another, creating a trade anything, anywhere and anytime marketplace.
Looking beyond mere trading costs, such studies can be used to gather some
evidence on what effect the mode of governance and other aspects of life in one
country have on another country, once they start joining up their financial
markets.


title:
Proof-theoretic strengths of weak theories for positive inductive
  definitions

abstract:
  In this paper the lightface $\Pi^{1}_{1}$-Comprehension axiom is shown to be
proof-theoretically strong even over $\mbox{RCA}_{0}^{*}$, and we calibrate the
proof-theoretic ordinals of weak fragments of the theory $\mbox{ID}_{1}$ of
positive inductive definitions over natural numbers. Conjunctions of negative
and positive formulas in the transfinite induction axiom of $\mbox{ID}_{1}$ are
shown to be weak, and disjunctions are strong. Thus we draw a boundary line
between predicatively reducible and impredicative fragments of $\mbox{ID}_{1}$.


title:
Dynamic heterogeneity in two-dimensional supercooled liquids: comparison
  of bond-breaking and bond-orientational correlations

abstract:
  We compare the spatial correlations of bond-breaking events and
bond-orientational relaxation in a model two-dimensional liquid undergoing
Newtonian dynamics. We find that the relaxation time of the bond-breaking
correlation function is much longer than the relaxation time of the
bond-orientational correlation function and self-intermediate scattering
function. However, the relaxation time of the bond-orientational correlation
function increases faster with decreasing temperature than the relaxation time
of the bond-breaking correlation function and the self-intermediate scattering
function. Moreover, the dynamic correlation length that characterizes the size
of correlated bond-orientational relaxation grows faster with decreasing
temperature than the dynamic correlation length that characterizes the size of
correlated bond-breaking events. We also examine the ensemble-dependent and
ensemble-independent dynamic susceptibilities for both bond-breaking
correlations and bond-orientational correlations. We find that for both
correlations, the ensemble-dependent and ensemble-independent susceptibilities
exhibit a maximum at nearly the same time, and this maximum occurs at a time
slightly shorter than the peak position of the dynamic correlation length.


title:
Manipulation of polarization and spatial properties of light beams with
  chiral metafilms

abstract:
  Two-dimensional lattices of chiral nanoholes in a plasmonic film with lattice
constants being slightly larger than light wavelength are proposed for
effective control of polarization and spatial properties of light beams.
Effective polarization conversion and strong circular dichroism in non-zero
diffraction orders in these chiral metafilms are demonstrated by
electromagnetic simulations. These interesting effects are found to result from
interplay between radiation pattern of single chiral nanohole and diffraction
pattern of the planar lattice, and can be manipulated by varying wavelength and
polarization of incoming light as well as period of metastructure and
refractive indexes of substrate and overlayer. Therefore, this work offers a
novel paradigm for developing planar chiral metafilm-based optical devices with
controllable polarization state, spatial orientation and intensity of outgoing
light.


title:
Photon distributions and information nonnegativity versus quadrature
  uncertainty relation

abstract:
  Using entropic inequalities for Shannon entropies new inequalities for some
classical polynomials are obtained. To this end, photon distribution functions
for one-, two- and multi-mode squeezed states in terms of Hermite, Laguerre,
Legendre polynomials and Gauss' hypergeometric functions are used. The
dependence between the violation of the quadrature uncertainty relation, the
sign and the existence of the distribution function of such states is
considered.


title:
Newton-Okounkov convex bodies of Schubert varieties and polyhedral
  realizations of crystal bases

abstract:
  A Newton-Okounkov convex body is a convex body constructed from a projective
variety with a valuation on its homogeneous coordinate ring; this is deeply
connected with representation theory. For instance, the Littelmann string
polytopes and the Feigin-Fourier-Littelmann-Vinberg polytopes are examples of
Newton-Okounkov convex bodies. In this paper, we prove that the Newton-Okounkov
convex body of a Schubert variety with respect to a specific valuation is
identical to the Nakashima-Zelevinsky polyhedral realization of a Demazure
crystal. As an application of this result, we show that Kashiwara's involution
(*-operation) corresponds to a change of valuations on the rational function
field.


title:
Electron carriers with possible Dirac-cone-like dispersion in
  FeSe$_{1-x}$S$_x$ ($x$ = 0 and 0.14) single crystals triggered by structural
  transition

abstract:
  We report detailed study of the transport properties of FeSe$_{1-x}$S$_x$
($x$ = 0 and 0.14) single crystals grown by vapor transport method. 14\% S
doping is found significantly suppress the structural transition from $T_s$
$\sim$ 86 K in FeSe to $\sim$ 49 K, although the superconducting transition
temperature, $T_c$, is only slightly affected. A pronounced linear
magnetoresistance (MR) is observed in both FeSe and FeSe$_{0.86}$S$_{0.14}$
single crystals, which is found to be triggered by the structural transition.
The linear MR and related discussion indicate the possible existence of
Dirac-cone-like state, which may come from the band shift induced by
ferro-orbital order. The mobility of the Dirac-cone-like band is found to
decrease after S doping. Besides, the invalid Kohler's scaling of MR is found
for temperature below $T_s$ in both crystals, however the re-establishment of
the Kohler's scaling at temperatures below 30 K is observed in FeSe, but not in
FeSe$_{0.86}$S$_{0.14}$. All these observations above support that the orbital
ordering causes the band reconstruction in FeSe, and also that the orbital
ordering in FeSe is suppressed by the chemical pressure from S doping.


title: Discovery of Two New Pulsars in 47 Tucanae (NGC 104)

abstract:
  We report the discovery of two new millisecond pulsars (PSRs J0024$-$7204aa
and J0024$-$7204ab) in the globular cluster 47\,Tucanae (NGC 104). Our results
bring the total number of pulsars in 47\,Tucanae to 25. These pulsars were
discovered by reprocessing archival observations from the Parkes radio
telescope. We reprocessed the data using a standard search procedure based on
the PRESTO software package as well as using a new method in which we
incoherently added the power spectra corresponding to $\sim$1100\,hr of
observations. The newly discovered PSR~J0024$-$7204aa, has a pulse frequency of
$\rm \sim$541\,Hz (corresponding to a $\rm \sim$1.84 ms period), which is
higher than any other pulsars currently known in the cluster and ranks
12$^{\rm{th}}$ amongst all the currently known pulsars. The dispersion measure
of this pulsar, 24.941(7)\,cm$^{-3}$ pc, is the highest in the cluster. The
second discovered pulsar, PSR~J0024$-$7204ab, is an isolated pulsar with a
pulse frequency of $\rm \sim$270\,Hz (corresponding to a period of $\rm
\sim$3.70 ms).


title:
Two instability measures of a subspace of $P^{n}(K)$ under a subgroup of
  $\operatorname{Aut}(K)$

abstract:
  Let $K$ be a commutative field and let $V$ be a subspace of $P^{n}(K)$. Let
$\Gamma$ be a subgroup of $\operatorname{Aut}(K)$ and let $\Gamma$ act on
$P^{n}(K)$ by $\sigma((x_{i})_{0\leq i\leq n})=(\sigma(x_{i}))_{0\leq i\leq n}$
for $\sigma\in\Gamma$ and $(x_{i})_{0\leq i\leq n}\in P^{n}(K)$. In this paper,
we ask `how much' unstable $V$ is under $\Gamma$ by asking how much higher or
lower dimension the join and the meet of $\sigma(V)$ ($\sigma \in\Gamma$) have
than $V$, and answer it in terms of the Pl\"{u}cker coordinates of $V$ and the
invariant field $k$ of $\Gamma$, through presenting two `irrationality'
measures of $V$ over $k$.


title: The Weyl problem in warped product space

abstract:
  In this paper, we discuss the Weyl problem in warped product space. We obtain
the openness, non rigidity and some applications. These results together with
the a priori estimates obtained by Lu imply some existence results. Meanwhile
we reprove the infinitesimal rigidity in the space forms.


title:
Differential activation patterns in the same brain region led to
  opposite emotional states

abstract:
  In human studies, how averaged activation in a brain region relates to human
behavior has been extensively investigated. This approach has led to the
finding that positive and negative facial preferences are represented by
different brain regions. However, using a multi-voxel pattern induction method
we found that different patterns of neural activations within the cingulate
cortex (CC) play roles in representing opposite emotional states. In the
present study, while neutrally-preferred faces were presented, activation
patterns in the CC that corresponded to higher (or lower) preference were
repeatedly induced by the pattern induction method. As a result, previously
neutrally-preferred faces became more (or less) preferred. We conclude that a
different activation pattern in the CC, rather than averaged activation in a
different area, represents and causally determines positive or negative facial
preference. This new approach may reveal importance in an activation pattern
within a brain region in many cognitive functions.


title:
Cloud Server Benchmarks for Performance Evaluation of New Hardware
  Architecture

abstract:
  Adding new hardware features to a cloud computing server requires testing
both the functionalities and the performance of the new hardware mechanisms.
However, commonly used cloud computing server workloads are not
well-represented by the SPEC integer and floating-point benchmark and Parsec
suites typically used by the computer architecture community. Existing cloud
benchmark suites for scale-out or scale-up computing are not representative of
the most common cloud usage, and are very difficult to run on a cycle-accurate
simulator that can accurately model new hardware, like gem5. In this paper, we
present PALMScloud, a suite of cloud computing benchmarks for performance
evaluation of cloud servers, that is ready to run on the gem5 cycle-accurate
simulator. We demonstrate how our cloud computing benchmarks are used in
evaluating the cache performance of a new secure cache called Newcache as a
case study. We hope that these cloud benchmarks, ready to run on a dual-machine
gem5 simulator or on real machines, can be useful to other researchers
interested in improving hardware micro-architecture and cloud server
performance.


title:
Rate-distance tradeoff and resource costs for all-optical quantum
  repeaters

abstract:
  We present a resource-performance tradeoff of an all-optical quantum repeater
that uses photon sources, linear optics, photon detectors and classical
feedforward at each repeater node, but no quantum memories. We show that the
quantum-secure key rate has the form $R(\eta) = D\eta^s$ bits per mode, where
$\eta$ is the end-to-end channel's transmissivity, and the constants $D$ and
$s$ are functions of various device inefficiencies and the resource constraint,
such as the number of available photon sources at each repeater node. Even with
lossy devices, we show that it is possible to attain $s < 1$, and in turn
outperform the maximum key rate attainable without quantum repeaters, $R_{\rm
direct}(\eta) = -\log_2(1-\eta) \approx (1/\ln 2)\eta$ bits per mode for $\eta
\ll 1$, beyond a certain total range $L$, where $\eta \sim e^{-\alpha L}$ in
optical fiber. We also propose a suite of modifications to a recently-proposed
all-optical repeater protocol that ours builds upon, which lower the number of
photon sources required to create photonic clusters at the repeaters so as to
outperform $R_{\rm direct}(\eta)$, from $\sim 10^{11}$ to $\sim 10^{6}$ photon
sources per repeater node. We show that the optimum separation between repeater
nodes is independent of the total range $L$, and is around $1.5$ km for
assumptions we make on various device losses.


title: End-to-end Sequence Labeling via Bi-directional LSTM-CNNs-CRF

abstract:
  State-of-the-art sequence labeling systems traditionally require large
amounts of task-specific knowledge in the form of hand-crafted features and
data pre-processing. In this paper, we introduce a novel neutral network
architecture that benefits from both word- and character-level representations
automatically, by using combination of bidirectional LSTM, CNN and CRF. Our
system is truly end-to-end, requiring no feature engineering or data
pre-processing, thus making it applicable to a wide range of sequence labeling
tasks. We evaluate our system on two data sets for two sequence labeling tasks
--- Penn Treebank WSJ corpus for part-of-speech (POS) tagging and CoNLL 2003
corpus for named entity recognition (NER). We obtain state-of-the-art
performance on both the two data --- 97.55\% accuracy for POS tagging and
91.21\% F1 for NER.


title:
Convergence of the Lawrence-Doniach Energy for Layered Superconductors
  with Magnetic Fields near $H_{c_1}$

abstract:
  We analyze minimizers of the Lawrence-Doniach energy for three-dimensional
highly anisotropic superconductors with layered structure. For such a
superconductor occupying a bounded generalized cylinder in $\mathbb{R}^3$ with
equally spaced parallel layers, we assume an applied magnetic field that is
perpendicular to the layers with intensity $h_{ex}\sim|\ln\epsilon|$ as
$\epsilon\rightarrow 0$, where $\epsilon$ is the reciprocal of the
Ginzburg-Landau parameter. We prove compactness results for various physical
quantities of energy minimizers, and derive a Gamma-limit of the
Lawrence-Doniach energy as $\epsilon$ and the interlayer distance $s$ tend to
zero, under the additional assumption that the layers are weakly coupled (i.e.,
$s\gg\epsilon$).


title:
PCF Scheme for Periodic Data Transmission in Smart Metering Network with
  Cognitive Radio

abstract:
  The next generation Advanced Metering Infrastructure (AMI), with the aid of
two-way Smart Metering Network (SMN), is expected to support many advanced
functions. In this work, we focus on the application of remote periodic energy
consumption reporting, which is a fundamental and significant component of
Demand Response and Load Management. In order to support this periodic
application with satisfactory communication performance, a well-suited Media
Access Control (MAC) protocol needs to be designed. Because the number of Smart
Meters (communication nodes) involved in SMN are much larger than that in
today's local area networks, the traditional taking-turns MAC protocol, such as
Point Coordination Function (PCF) in WiFi is unlikely to perform well. In order
to solve this problem, we propose a modified PCF scheme with the combination of
Cognitive Radio technology, in which the Smart Meters may use the free channels
(white space) to report energy consumption data to the Local Collector when the
Primary Users are not occupying the channels. We also conduct comprehensive
throughput analysis on the proposed scheme. The numerical results and
simulation results through NS-3 show that the PCF scheme with Cognitive Radio
significantly outperform the traditional one in a densely populated network
like SMN.


title: Inclusion-exclusion principles for convex hulls and the Euler relation

abstract:
  Consider $n$ points $X_1,\ldots,X_n$ in $\mathbb R^d$ and denote their convex
hull by $\Pi$. We prove a number of inclusion-exclusion identities for the
system of convex hulls $\Pi_I:=conv(X_i\colon i\in I)$, where $I$ ranges over
all subsets of $\{1,\ldots,n\}$. For instance, denoting by $c_k(X)$ the number
of $k$-element subcollections of $(X_1,\ldots,X_n)$ whose convex hull contains
a point $X\in\mathbb R^d$, we prove that $$ c_1(X)-c_2(X)+c_3(X)-\ldots +
(-1)^{n-1} c_n(X) = (-1)^{\dim \Pi} $$ for all $X$ in the relative interior of
$\Pi$. This confirms a conjecture of R. Cowan [Adv. Appl. Probab.,
39(3):630--644, 2007] who proved the above formula for almost all $X$. We
establish similar results for the number of polytopes $\Pi_J$ containing a
given polytope $\Pi_I$ as an $r$-dimensional face, thus proving another
conjecture of R. Cowan [Discrete Comput. Geom., 43(2):209--220, 2010]. As a
consequence, we derive inclusion-exclusion identities for the intrinsic volumes
and the face numbers of the polytopes $\Pi_I$. The main tool in our proofs is a
formula for the alternating sum of the face numbers of a convex polytope
intersected by an affine subspace. This formula generalizes the classical
Euler--Schl\"afli--Poincar\'e relation and is of independent interest.


title:
Adaptive Finite Element Method for fractional differential equations
  using Hierarchical Matrices

abstract:
  A robust and fast solver for the fractional differential equation (FDEs)
involving the Riesz fractional derivative is developed using an adaptive finite
element method on non-uniform meshes. It is based on the utilization of
hierarchical matrices ($\mathcal{H}$-Matrices) for the representation of the
stiffness matrix resulting from the finite element discretization of the FDEs.
We employ a geometric multigrid method for the solution of the algebraic system
of equations. We combine it with an adaptive algorithm based on a posteriori
error estimation to deal with general-type singularities arising in the
solution of the FDEs. Through various test examples we demonstrate the
efficiency of the method and the high-accuracy of the numerical solution even
in the presence of singularities. The proposed technique has been verified
effectively through fundamental examples including Riesz, Left/Right
Riemann-Liouville fractional derivative and, furthermore, it can be readily
extended to more general fractional differential equations with different
boundary conditions and low-order terms. To the best of our knowledge, there
are currently no other methods for FDEs that resolve singularities accurately
at linear complexity as the one we propose here.


title: Learning deep representation of multityped objects and tasks

abstract:
  We introduce a deep multitask architecture to integrate multityped
representations of multimodal objects. This multitype exposition is less
abstract than the multimodal characterization, but more machine-friendly, and
thus is more precise to model. For example, an image can be described by
multiple visual views, which can be in the forms of bag-of-words (counts) or
color/texture histograms (real-valued). At the same time, the image may have
several social tags, which are best described using a sparse binary vector. Our
deep model takes as input multiple type-specific features, narrows the
cross-modality semantic gaps, learns cross-type correlation, and produces a
high-level homogeneous representation. At the same time, the model supports
heterogeneously typed tasks. We demonstrate the capacity of the model on two
applications: social image retrieval and multiple concept prediction. The deep
architecture produces more compact representation, naturally integrates
multiviews and multimodalities, exploits better side information, and most
importantly, performs competitively against baselines.


title: Neural Architectures for Named Entity Recognition

abstract:
  State-of-the-art named entity recognition systems rely heavily on
hand-crafted features and domain-specific knowledge in order to learn
effectively from the small, supervised training corpora that are available. In
this paper, we introduce two new neural architectures---one based on
bidirectional LSTMs and conditional random fields, and the other that
constructs and labels segments using a transition-based approach inspired by
shift-reduce parsers. Our models rely on two sources of information about
words: character-based word representations learned from the supervised corpus
and unsupervised word representations learned from unannotated corpora. Our
models obtain state-of-the-art performance in NER in four languages without
resorting to any language-specific knowledge or resources such as gazetteers.


title:
Quantum critical points in tunneling junction of topological
  superconductor and topological insulator

abstract:
  The tunneling junction between one-dimensional topological superconductor and
integer (fractional) topological insulator (TI), realized via point contact, is
investigated theoretically with bosonization technology and renormalization
group methods. For the integer TI case, in a finite range of edge interaction
parameter, there is a non-trivial stable fixed point which corresponds to the
physical picture that the edge of TI breaks up into two sections at the
junction, with one side coupling strongly to the Majorana fermion and
exhibiting perfect Andreev reflection, while the other side decouples,
exhibiting perfect normal reflection at low energies. This fixed point can be
used as a signature of the Majorana fermion and tested by nowadays experiment
techniques. For the fractional TI case, the universal low-energy transport
properties are described by perfect normal reflection, perfect Andreev
reflection, or perfect insulating fixed points dependent on the filling
fraction and edge interaction parameter of fractional TI.


title: A classical nucleation theory description of active colloid assembly

abstract:
  Non-aligning self-propelled particles with purely repulsive excluded volume
interactions undergo athermal motility-induced phase separation into a dilute
gas and a dense cluster phase. Here, we use enhanced sampling computational
methods and analytic theory to examine the kinetics of formation of the dense
phase. Despite the intrinsically nonequilibrium nature of the phase transition,
we show that the kinetics can be described using an approach analogous to
equilibrium classical nucleation theory, governed by an effective free energy
of cluster formation with identifiable bulk and surface terms. The theory
captures the location of the binodal, nucleation rates as a function of
supersaturation, and the cluster size distributions below the binodal, while
discrepancies in the metastable region reveal additional physics about the
early stages of active crystal formation. The success of the theory shows that
a framework similar to equilibrium thermodynamics can be obtained directly from
the microdynamics of an active system, and can be used to describe the kinetics
of evolution toward nonequilibrium steady states.


title: A note on rough $I$-convergence of double sequences

abstract:
  In this paper we study some basic properties of rough $I$-convergent double
sequences in the line of D$\ddot{u}$ndar [8]. We also study the set of all
rough $I$-limits of a double sequence and relation between boundedness and
rough $I$-convergence of a double sequence.


title: Optical realization of the dissipative quantum oscillator

abstract:
  An optical realization of the damped quantum oscillator, based on transverse
light dynamics in an optical resonator with slowly-moving mirrors, is
theoretically suggested. The optical resonator setting provides a simple
implementation of the time-dependent Caldirola-Kanai Hamiltonian of the
dissipative quantum oscillator, and enables to visualize the effects of damped
oscillations in the classical (ray optics) limit and wave packet collapse in
the quantum (wave optics) regime.


title: Quantum speed limit of a non-decoherent open system

abstract:
  We study the minimum time related to the quantum speed limit that
characterizes the evolution of an open quantum system with the help of a simple
model in the short and long time limits. We compare in particular the situation
corresponding to a unique state and several states in the environment space.
For short time intervals the results show a sensible difference in the
behaviour of the system for different strengths of the interaction between the
system and its environment.


title:
Collide and Conquer: Constraints on Simplified Dark Matter Models using
  Mono-X Collider Searches

abstract:
  The use of simplified models as a tool for interpreting dark matter collider
searches has become increasingly prevalent, and while early Run II results are
beginning to appear, we look to see what further information can be extracted
from the Run I dataset. We consider three `standard' simplified models that
couple quarks to fermionic singlet dark matter: an $s$-channel vector mediator
with vector or axial-vector couplings, and a $t$-channel scalar mediator. Upper
limits on the couplings are calculated and compared across three alternate
channels, namely mono-jet, mono-$Z$ (leptonic) and mono-$W/Z$ (hadronic). The
strongest limits are observed in the mono-jet channel, however the
computational simplicity and absence of significant $t$-channel model width
effects in the mono-boson channels make these a straightforward and competitive
alternative. We also include a comparison with relic density and direct
detection constraints.


title:
Motivating Healthy Water Intake through Prompting, Historical
  Information, and Implicit Feedback

abstract:
  We describe Hydroprompt, a prototype for sensing and motivating healthy water
intake in work environments. In a 3-week field deployment of Hydroprompt, we
evaluate the effectiveness of three approaches to behavior change: historical
information enabling users to compare their water intake lev- els across
different times of day and days of week, implicit feedback providing subtle
cues to users on the current hydration levels, and explicit prompting at-
tempting to remind participants when hydration falls below acceptable levels or
when substantial amount of time has elapsed since the last sip.


title: Cubic arc-transitive $k$-circulants

abstract:
  For an integer $k\geq 1$, a graph is called a $k$-circulant if its
automorphism group contains a cyclic semiregular subgroup with $k$ orbits on
the vertices. We show that, if $k$ is even, there exist infinitely many cubic
arc-transitive $k$-circulants. We conjecture that, if $k$ is odd, then a cubic
arc-transitive $k$-circulant has order at most $6k^2$. Our main result is a
proof of this conjecture when $k$ is squarefree and coprime to $6$.


title: Designing for Different Stages in Behavior Change

abstract:
  The behavior change process is a dynamic journey with different informational
and motivational needs across its different stages; yet current technologies
for behavior change are static. In our recent deployment of Habito, an activity
tracking mobile app, we found individuals "readiness" to behavior change (or
the stage of behavior change they were in) to be a strong predictor of
adoption. Individuals in the contemplation and preparation stages had an
adoption rate of 56%, whereas individuals in precontemplation, action or
maintenance stages had an adoption rate of only 20%. In this position paper we
argue for behavior change technologies that are tailored to the different
stages of behavior change.


title: Compact Operations on Model Spaces

abstract:
  We give a characterization of the compact operators on a model space in terms
of asymptotic Toeplitz operators.


title: Hamiltonian prisms on 5-chordal graphs

abstract:
  In this paper, we provide a method to find a Hamiltonian cycle in the prism
of a 5-chordal graph, which is $(1+\epsilon)$-tough, with some special
conditions.


title: Numerical CP Decomposition of Some Difficult Tensors

abstract:
  In this paper, a numerical method is proposed for canonical polyadic (CP)
decomposition of small size tensors. The focus is primarily on decomposition of
tensors that correspond to small matrix multiplications. Here, rank of the
tensors is equal to the smallest number of scalar multiplications that are
necessary to accomplish the matrix multiplication. The proposed method is based
on a constrained Levenberg-Marquardt optimization. Numerical results indicate
the rank and border ranks of tensors that correspond to multiplication of
matrices of the size 2x3 and 3x2, 3x3 and 3x2, 3x3 and 3x3, and 3x4 and 4x3.
The ranks are 11, 15, 23 and 29, respectively. In particular, a novel algorithm
for multiplying the matrices of the sizes 3x3 and 3x2 with 15 multiplications
is presented.


title: Optimal efficiency of quantum transport in a disordered trimer

abstract:
  Disordered quantum networks, as those describing light-harvesting complexes,
are often characterized by the presence of peripheral ring-like structures,
where the excitation is initialized, and inner reaction centers (RC), where the
excitation is trapped. The peripheral rings display coherent features: their
eigenstates can be separated in the two classes of superradiant and subradiant
states. Both are important to optimize transfer efficiency. In the absence of
disorder, superradiant states have an enhanced coupling strength to the RC,
while the subradiant ones are basically decoupled from it. Static on-site
disorder induces a coupling between subradiant and superradiant states,
creating an indirect coupling to the RC. The problem of finding the optimal
transfer conditions, as a function of both the RC energy and the disorder
strength, is very complex even in the simplest network, namely a three-level
system. In this paper we analyze such trimeric structure choosing as initial
condition a subradiant state, rather than the more common choice of an
excitation localized on a site. We show that, while the optimal disorder is of
the order of the superradiant coupling, the optimal detuning between the
initial state and the RC energy strongly depends on system parameters: when the
superradiant coupling is much larger than the energy gap between the
superradiant and the subradiant levels, optimal transfer occurs if the RC
energy is at resonance with the subradiant initial state, whereas we find an
optimal RC energy at resonance with a virtual dressed state when the
superradiant coupling is smaller than or comparable with the gap. The presence
of dynamical noise, which induces dephasing and decoherence, affects the
resonance structure of energy transfer producing an additional 'incoherent'
resonance peak, which corresponds to the RC energy being equal to the energy of
the superradiant state.


title: A Unified View of Localized Kernel Learning

abstract:
  Multiple Kernel Learning, or MKL, extends (kernelized) SVM by attempting to
learn not only a classifier/regressor but also the best kernel for the training
task, usually from a combination of existing kernel functions. Most MKL methods
seek the combined kernel that performs best over every training example,
sacrificing performance in some areas to seek a global optimum. Localized
kernel learning (LKL) overcomes this limitation by allowing the training
algorithm to match a component kernel to the examples that can exploit it best.
Several approaches to the localized kernel learning problem have been explored
in the last several years. We unify many of these approaches under one simple
system and design a new algorithm with improved performance. We also develop
enhanced versions of existing algorithms, with an eye on scalability and
performance.


title:
The gradient flow of a generalized Fisher information functional with
  respect to modified Wasserstein distances

abstract:
  This article is concerned with the existence of nonnegative weak solutions to
a particular fourth-order partial differential equation: it is a formal
gradient flow with respect to a generalized Wasserstein transportation distance
with nonlinear mobility. The corresponding free energy functional is referred
to as generalized Fisher information functional since it is obtained by
autodissipation of another energy functional which generates the heat flow as
its gradient flow with respect to the aforementioned distance. Our main results
are twofold: For mobility functions satisfying a certain regularity condition,
we show the existence of weak solutions by construction with the well-known
minimizing movement scheme for gradient flows. Furthermore, we extend these
results to a more general class of mobility functions: a weak solution can be
obtained by approximation with weak solutions of the problem with regularized
mobility.


title: Lasso estimation for GEFCom2014 probabilistic electric load forecasting

abstract:
  We present a methodology for probabilistic load forecasting that is based on
lasso (least absolute shrinkage and selection operator) estimation. The model
considered can be regarded as a bivariate time-varying threshold
autoregressive(AR) process for the hourly electric load and temperature. The
joint modeling approach incorporates the temperature effects directly, and
reflects daily, weekly, and annual seasonal patterns and public holiday
effects. We provide two empirical studies, one based on the probabilistic load
forecasting track of the Global Energy Forecasting Competition 2014
(GEFCom2014-L), and the other based on another recent probabilistic load
forecasting competition that follows a setup similar to that of GEFCom2014-L.
In both empirical case studies, the proposed methodology outperforms two
multiple linear regression based benchmarks from among the top eight entries to
GEFCom2014-L.


title: Dark-Photon searches via Higgs-boson production at the LHC

abstract:
  Dark photons $\bar \gamma$ mediating long-range forces in a dark sector are
predicted by various new physics scenarios, and are being intensively searched
for in experiments. We extend a previous study of a new discovery process for
dark photons proceedings via Higgs-boson production at the LHC. Thanks to the
non-decoupling properties of the Higgs boson, BR($H\to \gamma\bar \gamma$)
values up to a few percent are possible for a massless dark photon, even for
heavy dark-sector scenarios. The corresponding signature consists (for a Higgs
boson at rest) of a striking monochromatic photon with energy $E_{\gamma}=
m_H/2$, and similar amount of missing energy. We perform a model independent
analysis at the LHC of both the gluon-fusion and VBF Higgs production
mechanisms at 14 TeV, including parton-shower effects, and updating our
previous parton-level analysis at 8 TeV in the gluon-fusion channel by a more
realistic background modeling. We find that a $5\sigma$ sensitivity can be
reached in the gluon-fusion channel for BR($H\to \gamma\bar
\gamma)\simeq\,$0.1% with an integrated luminosity of $L\simeq 300\, {\rm
fb}^{-1}$. The corresponding VBF reach is instead restricted to 1%. Such decay
rates can be naturally obtained in dark-photon scenarios arising from unbroken
$U(1)_F$ models explaining the origin and hierarchy of the Yukawa couplings,
strongly motivating the search for this exotic Higgs decay at the LHC.


title: Gas Gaps in the Protoplanetary Disk around the Young Protostar HL Tau

abstract:
  We have analyzed the HCO+ (1-0) data of the Class I-II protostar, HL Tau,
obtained from the Atacama Large Millimeter/Submillimeter Array long baseline
campaign. We generated the HCO+ image cube at an angular resolution of ~0.07
(~10 AU), and performed azimuthal averaging on the image cube to enhance the
signal-to-noise ratio and measure the radial profile of the HCO+ integrated
intensity. Two gaps at radii of ~28 AU and ~69 AU and a central cavity are
identified in the radial intensity profile. The inner HCO+ gap is coincident
with the millimeter continuum gap at a radius of 32 AU. The outer HCO+ gap is
located at the millimeter continuum bright ring at a radius of 69 AU and
overlaps with the two millimeter continuum gaps at radii of 64 AU and 74 AU. On
the contrary, the presence of the central cavity is likely due to the high
optical depth of the 3 mm continuum emission and not the depletion of the HCO+
gas. We derived the HCO+ column density profile from its intensity profile.
From the column density profile, the full-width-half-maximum widths of the
inner and outer HCO+ gaps are both estimated to be ~14 AU, and their depths are
estimated to be ~2.4 and ~5.0. These results are consistent with the
expectation from the gaps opened by forming (sub-)Jovian mass planets, while
placing tight constraints on the theoretical models solely incorporating the
variation of dust properties and grain sizes.


title:
Geometric Hardy inequalities for the sub-elliptic Laplacian on convex
  domains in the Heisenberg group

abstract:
  We prove geometric $L^p$ versions of Hardy's inequality for the sub-elliptic
Laplacian on convex domains $\Omega$ in the Heisenberg group $\mathbb{H}^n$,
where convex is meant in the Euclidean sense. When $p=2$ and $\Omega$ is the
half-space given by $\langle \xi, \nu\rangle > d$ this generalizes an
inequality previously obtained by Luan and Yang. For such $p$ and $\Omega$ the
inequality is sharp and takes the form \begin{equation}
  \int_\Omega |\nabla_{\mathbb{H}^n}u|^2 \, d\xi \geq \frac{1}{4}\int_{\Omega}
\sum_{i=1}^n\frac{\langle X_i(\xi), \nu\rangle^2+\langle Y_i(\xi),
\nu\rangle^2}{\textrm{dist}(\xi, \partial \Omega)^2}|u|^2\, d\xi,
\end{equation} where $\textrm{dist}(\, \cdot\,, \partial \Omega)$ denotes the
Euclidean distance from $\partial \Omega$.


title:
Non-standard interactions spoiling the CP violation sensitivity at DUNE
  and other long baseline experiments

abstract:
  It is by now established that neutrino oscillations occur due to non-zero
masses and parameters in the leptonic mixing matrix. The extraction of
oscillation parameters may be complicated due to subleading effects such as
non-standard neutrino interactions (NSI) and one needs to have a fresh look how
a particular parameter value is inferred from experimental data. In the present
work, we focus on an important parameter entering the oscillation framework -
the leptonic CP violating phase $\delta$, about which we know very little. We
demonstrate that the sensitivity to CP violation gets significantly impacted
due to NSI effects for the upcoming long baseline experiment, Deep Underground
Neutrino Experiment (DUNE). We also draw a comparison with the sensitivities of
other ongoing neutrino beam experiments such as NOvA, and T2K, as well as a
future generation experiment, T2HK.


title: Central Engine Memory of Gamma-Ray Bursts and Soft Gamma-Ray Repeaters

abstract:
  Gamma-ray Bursts (GRBs) are bursts of $\gamma$-rays generated from
relativistic jets launched from catastrophic events such as massive star core
collapse or binary compact star coalescence. Previous studies suggested that
GRB emission is erratic, with no noticeable memory in the central engine. Here
we report a discovery that similar light curve patterns exist within individual
bursts for at least some GRBs. Applying the Dynamic Time Warping (DTW) method,
we show that similarity of light curve patterns between pulses of a single
burst or between the light curves of a GRB and its X-ray flare can be
identified. This suggests that the central engine of at least some GRBs carries
"memory" of its activities. We also show that the same technique can identify
memory-like emission episodes in the flaring emission in Soft Gamma-Ray
Repeaters (SGRs), which are believed to be Galactic, highly magnetized neutron
stars named magnetars. Such a phenomenon challenges the standard black hole
central engine models for GRBs, and suggest a common physical mechanism behind
GRBs and SGRs, which points towards a magnetar central engine of GRBs.


title: Reptilings and space-filling curves for acute triangles

abstract:
  An $r$-gentiling is a dissection of a shape into $r \geq 2$ parts which are
all similar to the original shape. An $r$-reptiling is an $r$-gentiling of
which all parts are mutually congruent. By applying gentilings recursively,
together with a rule that defines an order on the parts, one may obtain an
order in which to traverse all points within the original shape. We say such a
traversal is a face-continuous space-filling curve if, at any level of
recursion, the interior of the union of any set of consecutive parts is
connected---that is, consecutive parts must always meet along an edge. Most
famously, the isosceles right triangle admits a 2-reptiling, which forms the
basis of the face-continuous Sierpinski space-filling curve; many other right
triangles admit reptilings and gentilings that yield face-continuous
space-filling curves as well. In this study we investigate what acute triangles
admit non-trivial reptilings and gentilings, and whether these can form the
basis for face-continuous space-filling curves. We derive several properties of
reptilings and gentilings of acute (sometimes also obtuse) triangles, leading
to the following conclusion: no face-continuous space-filling curve can be
constructed on the basis of reptilings of acute triangles.


title: Self-consistent Calculation of the Sommerfeld Enhancement

abstract:
  A calculation of the Sommerfeld enhancement is presented and applied to the
problem of s-wave non-relativistic dark matter annihilation. The difference
from previous computations in the literature is that the effect of the
underlying short-range scattering process is consistently included together
with the long-range force in the effective QM Schr\"odinger problem. Our
procedure satisfies partial-wave unitarity where previous calculations fail. We
provide analytic results for some potentials of phenomenological relevance.


title: In the Search of Optimal Concurrency

abstract:
  Implementing a concurrent data structure typically begins with defining its
sequential specification. However, when used \emph{as is}, a nontrivial
sequential data structure, such as a linked list, a search tree, or a hash
table, may expose incorrect behavior: lost updates, inconsistent responses,
etc. To ensure correctness, portions of the sequential code operating on the
shared data must be "protected" from data races using synchronization
primitives and, thus, certain schedules of the steps of concurrent operations
must be rejected. But can we ensure that we do not "overuse" synchronization,
i.e., that we reject a concurrent schedule only if it violates correctness?
  In this paper, we treat this question formally by introducing the notion of a
\emph{concurrency-optimal} implementation. A program's concurrency is defined
here as its ability to accept concurrent schedules, i.e., interleavings of
steps of its sequential implementation. An implementation is
concurrency-optimal if it accepts all interleavings that do not violate the
program's correctness. We explore the concurrency properties of \emph{search}
data structures which can be represented in the form of directed acyclic graphs
exporting insert, delete and search operations. We prove, for the first time,
that \emph{pessimistic} e.g., based on conservative locking) and
\emph{optimistic serializable} e.g., based on serializable transactional
memory) implementations of search data-structures are incomparable in terms of
concurrency. Specifically, there exist simple interleavings of sequential code
that cannot be accepted by \emph{any} pessimistic (and \emph{resp.},
serializable optimistic) implementation, but accepted by a serializable
optimistic one (and \emph{resp.}, pessimistic). Thus, neither of these two
implementation classes is concurrency-optimal.


title:
Astrophysical interpretation of small-scale neutrino angular correlation
  searches with IceCube

abstract:
  The IceCube Neutrino Observatory has discovered a diffuse all-flavor flux of
high-energy astrophysical neutrinos. However, the corresponding astrophysical
sources have not yet been identified. Neither significant point sources nor
significant angular correlations of event directions have been observed by
IceCube or other instruments to date. We present a new method to interpret the
non-observation of angular correlations in terms of exclusions on the strength
and number of point-like sources in generic astrophysical scenarios.
Additionally, we constrain the presence of these sources taking into account
the measurement of the diffuse high-energy neutrino flux by IceCube. We apply
the method to two types of astrophysically motivated source count
distributions: The first type is obtained by considering the cosmological
evolution of the co-moving density of active galaxies, while the second type is
directly derived from the gamma ray source count distribution observed by
Fermi-LAT. As a result, we constrain the possible parameter space for both
types of source count distributions.


title:
Short time full asymptotic expansion of hypoelliptic heat kernel at the
  cut locus

abstract:
  In this paper we prove a short time asymptotic expansion of a hypoelliptic
heat kernel on an Euclidean space and a compact manifold. We study the "cut
locus" case, namely, the case where energy-minimizing paths which join the two
points under consideration form not a finite set, but a compact manifold. Under
mild assumptions we obtain an asymptotic expansion of the heat kernel up to any
order. Our approach is probabilistic and the heat kernel is regarded as the
density of the law of a hypoelliptic diffusion process, which is realized as a
unique solution of the corresponding stochastic differential equation. Our main
tools are S. Watanabe's distributional Malliavin calculus and T. Lyons' rough
path theory.


title: Chaotic Bohmian trajectories for stationary states

abstract:
  In Bohmian mechanics, the nodes of the wave function play an important role
in the generation of chaos. However, so far, most of the attention has been on
moving nodes; little is known about the possibility of chaos in the case of
stationary nodes. We address this question by considering stationary states,
which provide the simplest examples of wave functions with stationary nodes. We
provide examples of stationary wave functions for which there is chaos, as
demonstrated by numerical computations, for one particle moving in 3 spatial
dimensions and for two and three entangled particles in two dimensions. Our
conclusion is that the motion of the nodes is not necessary for the generation
of chaos. What is important is the overall complexity of the wave function.
That is, if the wave function, or rather its phase, has complex spatial
variations, it will lead to complex Bohmian trajectories and hence to chaos.
Another aspect of our work concerns the average Lyapunov exponent, which
quantifies the overall amount of chaos. Since it is very hard to evaluate the
average Lyapunov exponent analytically, which is often computed numerically, it
is useful to have simple quantities that agree well with the average Lyapunov
exponent. We investigate possible correlations with quantities such as the
participation ratio and different measures of entanglement, for different
systems and different families of stationary wave functions. We find that these
quantities often tend to correlate to the amount of chaos. However, the
correlation is not perfect, because, in particular, these measures do not
depend on the form of the basis states used to expand the wave function, while
the amount of chaos does.


title:
CP-Violation in the $ZZZ$ and $ZWW$ vertices at $e^+e^-$ colliders in
  Two-Higgs-Doublet Models

abstract:
  We discuss possibilities of measuring CP violation in the Two-Higgs-Doublet
Model by studying effects of one-loop generated $ZZZ$ and $ZWW$ vertices. We
discuss a set of CP-sensitive asymmetries for $ZZ$ and $W^+W^-$ production at
linear $e^+e^-$-colliders, that directly depends on the weak-basis invariant Im
$J_2$ that parametrises the strength of CP violation. Given the restrictions on
this model that follow from the LHC measurements, the predicted effects are
small. Pursuing such measurements is however very important, as an observed
signal might point to a richer scalar sector.


title: Quantum Correlations from the Conditional Statistics of Incomplete Data

abstract:
  We study, in theory and experiment, the quantum properties of correlated
light fields measured with click-counting detectors providing incomplete
information on the photon statistics. We establish a correlation parameter for
the conditional statistics, and we derive the corresponding nonclassicality
criteria for detecting conditional quantum correlations. Classical bounds for
Pearson's correlation parameter are formulated that allow us, once they are
violated, to determine nonclassical correlations via the joint statistics. On
the one hand, we demonstrate nonclassical correlations in terms of the joint
click statistics of light produced by a parametric down conversion source. On
the other hand, we verify quantum correlations of a heralded, split
single-photon state via the conditional click statistics together with a
generalization to higher-order moments. We discuss the performance of the
presented nonclassicality criteria to successfully discern joint and
conditional quantum correlations. Remarkably, our results are obtained without
making any assumptions on the response function, quantum efficiency, and
dark-count rate of the photodetectors.


title:
Density functional theory studies of MTSL nitroxide side chain
  conformations attached to an activation loop

abstract:
  A quantum-mechanical (QM) method rooted on density functional theory (DFT)
has been employed to determine conformations of the methane-thiosulfonate spin
label (MTSL) attached to a fragment extracted from the activation loop of
Aurora-A kinase. The features of the calculated energy surface revealed low
energy barriers between isoenergetic minima and the system could be described
in a population of 76 rotamers that can be also considered for other systems
since it was found that the X3, X4 and X5 do not depend on the previous two
dihedral angles. Conformational states obtained were seen to comparable to
those obtained in the {\alpha}-helix systems studied previously, indicating
that the protein backbone does not affect the torsional profiles significantly
and suggesting the possibility to use determined conformations for other
protein systems for further modelling studies.


title: Lipschitz-free spaces and Schur properties

abstract:
  In this paper we study $\ell_1$-like properties for some Lipschitz-free
spaces. The main result states that, under some natural conditions, the
Lipschitz-free space over a proper metric space linearly embeds into an
$\ell_1$-sum of finite dimensional subspaces of itself. We also give a
sufficient condition for a Lipschitz-free space to have the Schur property, the
$1$-Schur property and the $1$-strong Schur property respectively. We finish by
studying those properties on a new family of examples, namely the
Lipschitz-free spaces over metric spaces originating from $p$-Banach spaces,
for $p$ in $(0,1)$.


title: Proportional Fair Rate Allocation for Private Shared Networks

abstract:
  In this paper, we consider fair privacy in a shared network subject to
traffic analysis attacks by an eavesdropper. We initiate the study of the joint
trade-off between privacy, throughput and delay in such a shared network as a
utility fairness problem and derive the proportional fair rate allocation for
networks of flows subject to privacy constraints and delay deadlines.


title:
Inter-User Interference Coordination in Full-Duplex Systems Based on
  Geographical Context Information

abstract:
  We propose a coordination scheme to minimize the interference between users
in a cellular network with full-duplex base stations and half-duplex user
devices. Our scheme exploits signal attenuation from obstacles between the
users by (i) extracting spatially isolated regions from a radio map and (ii)
assigning simultaneous co-channel uplink and downlink transmissions to users in
these regions such that inter-user interference is minimized. While adding low
computational complexity and insignificant signaling overhead to existing
deployments, evaluating our solution with real coverage data shows impressive
gains compared to conventional half-duplex and full-duplex operation.


title:
Pluriassociative algebras II: The polydendriform operad and related
  operads

abstract:
  Dendriform algebras form a category of algebras recently introduced by Loday.
A dendriform algebra is a vector space endowed with two nonassociative binary
operations satisfying some relations. Any dendriform algebra is an algebra over
the dendriform operad, the Koszul dual of the diassociative operad. We
introduce here, by adopting the point of view and the tools offered by the
theory of operads, a generalization on a nonnegative integer parameter $\gamma$
of dendriform algebras, called $\gamma$-polydendriform algebras, so that
$1$-polydendriform algebras are dendriform algebras. For that, we consider the
operads obtained as the Koszul duals of the $\gamma$-pluriassociative operads
introduced by the author in a previous work. In the same manner as dendriform
algebras are suitable devices to split associative operations into two parts,
$\gamma$-polydendriform algebras seem adapted structures to split associative
operations into $2\gamma$ operation so that some partial sums of these
operations are associative. We provide a complete study of the
$\gamma$-polydendriform operads, the underlying operads of the category of
$\gamma$-polydendriform algebras. We exhibit several presentations by
generators and relations, compute their Hilbert series, and construct free
objects in the corresponding categories. We also provide consistent
generalizations on a nonnegative integer parameter of the duplicial,
triassociative and tridendriform operads, and of some operads of the operadic
butterfly.


title: Dimerization transitions in spin-1 chains

abstract:
  We study spontaneous dimerization transitions in a Heisenberg spin-1 chain
with additional next-nearest neighbor (NNN) and 3-site interactions using
extensive numerical simulations and a conformal field theory analysis. We show
that the transition can be second order in the WZW SU(2)$_2$ or Ising
universality class, or first-order. We argue that these features are generic
because of a marginal operator in the WZW SU(2)$_2$ model, and because of two
topologically distinct non-dimerized phases with or without edge states. We
also provide explicit numerical evidence of conformal towers of singlets inside
the spin gap at the Ising transition. Implications for other models are briefly
discussed.