title: Witten's top Chern class via cosection localization

abstract:
  For a Landau Ginzburg space ([C^n/G],W), we construct the Witten's top Chern
classes as algebraic cycles via cosection localized virtual cycles in case all
sectors are narrow. We verify all axioms of such classes. We derive an explicit
formula of such classes in the free case. We prove that this construction is
equivalent to the prior constructions of Polishchuk-Vaintrob, of Chiodo and of
Fan-Jarvis-Ruan.


title: Hardware Architecture for List SC Decoding of Polar Codes

abstract:
  We present a hardware architecture and algorithmic improvements for list SC
decoding of polar codes. More specifically, we show how to completely avoid
copying of the likelihoods, which is algorithmically the most cumbersome part
of list SC decoding. The hardware architecture was synthesized for a
blocklength of N = 1024 bits and list sizes L = 2, 4 using a UMC 90nm VLSI
technology. The resulting decoder can achieve a coded throughput of 181 Mbps at
a frequency of 459 MHz.


title: Results of the Recent \epsilon Aurigae Eclipse Campaign

abstract:
  Results of the 2010 eclipse campaign are described, and preliminary
interpretations proposed. These include photometric, interferometric,
spectroscopic, astrometric and polarimetric observational results. Next steps,
along with continued monitoring, include simulations and other future work.
Numerous acknowledgements are appropriate for the many participants in making
this international effort a success.


title: Reaching the chiral limit in many flavor systems

abstract:
  We present a brief overview of our recent lattice studies of SU(3) gauge
theory with N_f = 8 and 12 fundamental fermions, including some new and
yet-unpublished results.
  To explore relatively unfamiliar systems beyond lattice QCD, we carry out a
wide variety of investigations with the goal of synthesizing the results to
better understand the non-perturbative dynamics of these systems.
  All our findings are consistent with conformal infrared dynamics in the
12-flavor system, but with 8 flavors we observe puzzling behavior that requires
further investigation.
  Our new Monte Carlo renormalization group technique exploits the Wilson flow
to obtain more direct predictions of a 12-flavor IR fixed point.
  Studies of N_f = 12 bulk and finite-temperature transitions also indicate IR
conformality, while our current results for the 8-flavor phase diagram do not
yet provide clear signs of spontaneous chiral symmetry breaking.
  From the Dirac eigenvalue spectrum we extract the mass anomalous dimension
gamma_m, and predict gamma*_m = 0.32(3) at the 12-flavor fixed point.
  The N_f = 8 system again shows interesting behavior, with a large anomalous
dimension across a wide range of energy scales.
  We use the eigenvalue density to predict the chiral condensate, and compare
this approach with direct and partially-quenched measurements.


title:
Coated inclusions of finite conductivity neutral to multiple fields in
  two dimensional conductivity or anti-plane elasticity

abstract:
  We consider the problem of neutral inclusions for two-dimensional
conductivity and anti-plane elasticity. The neutral inclusion, when inserted in
a matrix having a uniform field, does not disturb the field outside the
inclusion. The inclusion consists of a core and a shell. We show that if the
inclusion is neutral to two linearly independent fields, then the core and the
shell are confocal ellipses.


title:
On the geometrical description of fractional Chern insulators based on
  static structure factor calculations

abstract:
  We study the static structure factor of the fractional Chern insulator
Laughlin-like state and provide analytical forms for this quantity in the
long-distance limit. In the course of this we identify averaged over Brillouin
zone Fubini Study metric as the relevant metric in the long-distance limit. We
discuss under which conditions the static structure factor will assume the
usual behavior of Laughlin-like fractional quantum Hall system i.e. the
scenario of Girvin, MacDonald, and Platzman [Phys. Rev. B 33, 2481 (1986)]. We
study the influence of the departure of the averaged over Brillouin zone Fubini
Study metric from its fractional quantum Hall value which appears in the
long-distance analysis as an effective change of the filling factor. According
to our exact diagonalization results on the Haldane model and analytical
considerations we find persistence of fractional Chern insulator state even in
this region of the parameter space.


title: Stick-Slip Nanofriction in Trapped Cold Ion Chains

abstract:
  Stick-slip -- the sequence of mechanical instabilities through which a slider
advances on a solid substrate -- is pervasive throughout sliding friction, from
nano to geological scales. Here we suggest that trapped cold ions in an optical
lattice can also be of help in understanding stick-slip friction, and also the
way friction changes when one of the sliders undergoes structural transitions.
For that scope, we simulated the dynamical properties of a 101-ions chain,
driven to slide back and forth by a slowly oscillating electric field in an
incommensurate periodic "corrugation" potential of increasing magnitude U0. We
found the chain sliding to switch, as U0 increases and before the Aubry
transition, from a smooth-sliding regime with low dissipation to a stick-slip
regime with high dissipation. In the stick-slip regime the onset of overall
sliding is preceded by precursor events consisting of partial slips of few ions
only, leading to partial depinning of the chain, a nutshell remnant of
precursor events at the onset of motion also observed in macroscopic sliders.
Seeking to identify the possible effects on friction of a structural
transition, we reduced the trapping potential aspect ratio until the ion chain
shape turned from linear to zigzag. Dynamic friction was found to rise at the
transition, reflecting the opening of newer dissipation channels.


title:
Measurements of the branching fractions of $B^{+} \to p \bar p K^{+}$
  decays

abstract:
  The branching fractions of the decay $B^{+} \to p \bar p K^{+}$ for different
intermediate states are measured using data, corresponding to an integrated
luminosity of $1.0 fb^{-1}$, collected by the LHCb experiment. The total
branching fraction, its charmless component $(M_{p\bar p} <2.85 {GeV/}c^{2})$
and the branching fractions via the resonant $c\bar c$ states $\eta_{c}(1S)$
and $\psi(2S)$ relative to the decay via a $J/\psi$ intermediate state are
{align*} \frac{{\mathcal B}(B^{+} \to p \bar p K^{+})_{total}}{{\mathcal
B}(B^{+} \to J/\psi K^{+} \to p \bar p K^{+})}=& \, 4.91 \pm 0.19 \, {(\rm
stat)} \pm 0.14 \, {(\rm syst)}, \frac{{\mathcal B}(B^{+} \to p \bar p
K^{+})_{M_{p\bar p} <2.85 {GeV/}c^{2}}}{{\mathcal B}(B^{+} \to J/\psi K^{+} \to
p \bar p K^{+})}=& \, 2.02 \pm 0.10 \, {(\rm stat)}\pm 0.08 \, {(\rm syst)},
\frac{{\mathcal B} (B^{+} \to \eta_{c}(1S) K^{+} \to p \bar p K^{+})}{{\mathcal
B}(B^{+} \to J/\psi K^{+} \to p \bar p K^{+})} = & \, 0.578 \pm 0.035 \, {(\rm
stat)} \pm 0.027 \, {(\rm syst)}, \frac{{\mathcal B} (B^{+} \to \psi(2S) K^{+}
\to p \bar p K^{+})}{{\mathcal B}(B^{+} \to J/\psi K^{+} \to p \bar p K^{+})}=&
\, 0.080 \pm 0.012 \, {(\rm stat)} \pm 0.009 \, {(\rm syst)}. {align*} Upper
limits on the $B^{+}$ branching fractions into the $\eta_{c}(2S)$ meson and
into the charmonium-like states X(3872) and X(3915) are also obtained.


title:
Confinement and dynamical chiral symmetry breaking in a non-perturbative
  renormalizable quark model

abstract:
  Inspired by the construction of the Gribov-Zwanziger action in the Landau
gauge, we introduce a quark model exhibiting both confinement and chiral
symmetry aspects. An important feature is the incorporation of spontaneous
chiral symmetry breaking in a renormalizable fashion. The quark propagator in
the condensed vacuum turns out to be of a confining type. Besides a real pole,
it exhibits complex conjugate poles. The resulting spectral form is explicitly
shown to violate positivity, indicative of its unphysical character. Moreover,
the ensuing quark mass function fits well to existing lattice data. To further
validate the physical nature of the model, we identify a massless pseudoscalar
(i.e. a pion) in the chiral limit and present estimates for the rho meson mass
and decay constant.


title:
Finite size corrections to the large deviation function of the density
  in the one dimensional symmetric simple exclusion process

abstract:
  The symmetric simple exclusion process is one of the simplest
out-of-equilibrium systems for which the steady state is known. Its large
deviation functional of the density has been computed in the past both by
microscopic and macroscopic approaches. Here we obtain the leading finite size
correction to this large deviation functional. The result is compared to the
similar corrections for equilibrium systems.


title:
Proceedings Seventh Workshop on Logical and Semantic Frameworks, with
  Applications

abstract:
  This document contains the proceedings of the Seventh International Workshop
on Logical and Semantic Frameworks, with Applications, which was held on
September 29 and 30, 2012, in Rio de Janeiro, Brazil. It contains 11 regular
papers (9 long and 2 short) accepted for presentation at the meeting, as well
as extended abstracts of invited talks by Torben Bra\"uner (Roskilde
University, Denmark), Maribel Fern\'andez (King's College London, United
Kingdom), Edward Hermann Haeusler (PUC-Rio, Brazil) and Alexandre Miquel
(\'Ecole Normale Sup\'erieure de Lyon, France).


title:
Discrete Optimization of Statistical Sample Sizes in Simulation by Using
  the Hierarchical Bootstrap Method

abstract:
  The Bootstrap method application in simulation supposes that value of random
variables are not generated during the simulation process but extracted from
available sample populations. In the case of Hierarchical Bootstrap the
function of interest is calculated recurrently using the calculation tree. In
the present paper we consider the optimization of sample sizes in each vertex
of the calculation tree. The dynamic programming method is used for this aim.
Proposed method allows to decrease a variance of system characteristic
estimators.


title:
Unequivocal differentiation of coherent and chaotic light through
  interferometric photon correlation measurements

abstract:
  We present a novel experimental technique that can differentiate
unequivocally between chaotic light and coherent light with amplitude
fluctuations, and thus permits to characterize unambiguously the output of a
laser. This technique consists of measuring the second-order intensity
cross-correlation at the outputs of an unbalanced Michelson interferometer. It
is applied to a chaotic light source and to the output of a semiconductor
nanolaser whose "standard" intensity correlation function above-threshold
displays values compatible with a mixture of coherent and chaotic light. Our
experimental results demonstrate that the output of such lasers is not
partially chaotic but is indeed a coherent state with amplitude fluctuations.


title: Symmetry and Evolution in Quantum Gravity

abstract:
  We propose an operator constraint equation for the wavefunction of the
Universe that admits genuine evolution. While the corresponding classical
theory is equivalent to the canonical decomposition of General Relativity, the
quantum theory makes predictions that are distinct from Wheeler-DeWitt
cosmology. Furthermore, the local symmetry principle - and corresponding
observables - of the theory have a direct interpretation in terms of a
conventional gauge theory, where the gauge symmetry group is that of spatial
conformal diffeomorphisms (that preserve the spatial volume of the Universe).
The global evolution is in terms of an arbitrary parameter that serves only as
an unobservable label for successive states of the Universe. Our proposal
follows unambiguously from a suggestion of York whereby the independently
specifiable initial data in the action principle of General Relativity is given
by a conformal geometry and the spatial average of the York time on the
spacelike hypersurfaces that bound the variation. Remarkably, such a
variational principle uniquely selects the form of the constraints of the
theory so that we can establish a precise notion of both symmetry and evolution
in quantum gravity.


title:
Effective beam separation schemes for the measurement of the electric
  Aharonov-Bohm effect in an ion interferometer

abstract:
  We propose an experiment for the first proof of the type I electric
Aharonov-Bohm effect in an ion interferometer for hydrogen. The performances of
three different beam separation schemes are simulated and compared. The
coherent ion beam is generated by a single atom tip (SAT) source and separated
by either two biprisms with a quadrupole lens, two biprisms with an einzel-lens
or three biprisms. The beam path separation is necessary to introduce two metal
tubes that can be pulsed with different electric potentials. The high time
resolution of a delay line detector allows to work with a continuous ion beam
and circumvents the pulsed beam operation as originally suggested by Aharonov
and Bohm. We demonstrate, that the higher mass and therefore lower velocity of
ions compared to electrons combined with the high expected SAT ion emission
puts the direct proof of this quantum effect for the first time into reach of
current technical possibilities. Thereby a high coherent ion detection rate is
crucial to avoid long integration times that allow the influence of dephasing
noise from the environment. We can determine the period of the expected matter
wave interference pattern and the signal on the detector by determining the
superposition angle of the coherent partial beams. Our simulations were tested
with an electron interferometer setup and agree with the experimental results.
We determine the separation scheme with three biprisms to be most efficient and
predict a total signal acquisition time of only 80 s to measure a phase shift
from 0 to 2$\pi$ due to the electric Aharonov-Bohm effect.


title: Superconductivity of Mg/MgO interface formed by shock-wave pressure

abstract:
  A mixture of Mg and MgO has been subjected to a shock-wave pressure of 170
kbar. The ac susceptibility measurements of the product has revealed a
metastable superconductivity with Tc=30 K, characterized by glassy dynamics of
the shielding currents below Tc. Comparison of the ac susceptibility and the dc
magnetization measurements infers that the superconductivity arises within the
interfacial layer formed between metallic Mg and its oxide due to the
shock-wave treatment.


title: Why a Windy Torus?

abstract:
  Mass ejection in the form of winds or jets appears to be as fundamental to
quasar activity as accretion, and can be directly observed in many objects with
broadened and blue-shifted UV absorption features. A convincing argument for
radiation pressure driving this ionized outflow can be made within the dust
sublimation radius. Beyond, radiation pressure is even more important, as high
energy photons from the central engine can now push on dust grains. This
physics underlies the dusty-wind model for the putative obscuring torus.
Specifically, the dusty wind in our model is first launched from the outer
accretion disk as a magneto-centrifugal wind and then accelerated and shaped by
radiation pressure from the central continuum. Such a wind can plausibly
account for both the necessary obscuring medium to explain the ratio of
broad-to-narrow-line objects and the mid-infrared emission commonly seen in
quasar spectral energy distributions. A convincing demonstration that
large-scale, organized magnetic fields are present in radio-quiet active
galactic nuclei is now required to bolster the case for this paradigm.


title:
Integration theory for infinite dimensional volatility modulated
  Volterra processes

abstract:
  We treat a stochastic integration theory for a class of Hilbert-valued,
volatility-modulated, conditionally Gaussian Volterra processes. We apply
techniques from Malliavin calculus to define this stochastic integration as a
sum of a Skorohod integral, where the integrand is obtained by applying an
operator to the original integrand, and a correction term involving the
Malliavin derivative of the same altered integrand, integrated against the
Lebesgue measure. The resulting integral satisfies many of the expected
properties of a stochastic integral, including an It\^{o} formula. Moreover, we
derive an alternative definition using a random-field approach and relate both
concepts. We present examples related to fundamental solutions to partial
differential equations.


title: #Bigbirds Never Die: Understanding Social Dynamics of Emergent Hashtag

abstract:
  We examine the growth, survival, and context of 256 novel hashtags during the
2012 U.S. presidential debates. Our analysis reveals the trajectories of
hashtag use fall into two distinct classes: "winners" that emerge more quickly
and are sustained for longer periods of time than other "also-rans" hashtags.
We propose a "conversational vibrancy" framework to capture dynamics of
hashtags based on their topicality, interactivity, diversity, and prominence.
Statistical analyses of the growth and persistence of hashtags reveal novel
relationships between features of this framework and the relative success of
hashtags. Specifically, retweets always contribute to faster hashtag adoption,
replies extend the life of "winners" while having no effect on "also-rans."
This is the first study on the lifecycle of hashtag adoption and use in
response to purely exogenous shocks. We draw on theories of uses and
gratification, organizational ecology, and language evolution to discuss these
findings and their implications for understanding social influence and
collective action in social media more generally.


title: The genus two Goeritz group of $S^2 \times S^1$

abstract:
  The genus-g Goeritz group is the group of isotopy classes of
orientation-preserving homeomorphisms of a closed orientable 3-manifold that
preserve a given genus-g Heegaard splitting of the manifold. In this work, we
show that the genus-2 Goeritz group of $S^2 \times S^1$ is finitely presented,
and give its explicit presentation.


title: Diversities, hyperconvexity and fixed points

abstract:
  Diversities have been recently introduced as a generalization of metrics for
which a rich tight span theory could be stated. In this work we take up a
number of questions about hyperconvexity, diversities and fixed points of
nonexpansive mappings. Most of these questions are motivated by the study of
the connection between a hyperconvex diversity and its induced metric space for
which we provide some answers. Examples are given, for instance, showing that
such a metric space need not be hyperconvex but still we prove, as our main
result, that they enjoy the fixed point property for nonexpansive mappings
provided the diversity is bounded and that this boundedness condition cannot be
transferred from the diversity to the induced metric space.


title: Crystallography under external electric field

abstract:
  Structural response of crystals to an applied external perturbation is
important as a key for understanding microscopic origin of physical properties.
Experimental investigation of structural response is a great challenge for
modern structure analysis. We demonstrate how advanced X-ray diffraction
techniques facilitate probing tiny (10-4 {\AA}) distortions of bond lengths
under a permanent electric field. We also discuss details of the experimental
procedure essential for reaching such precision. We ask whether the experiment
can be used to evaluate chemical bonds in crystals by their sensitivity to an
external electric field and discuss if the bond deformations can be predicted
using the bond-valence model or the Bader's theory of atoms in molecules and
crystals. Finally, we describe the new time-resolved studies of a structural
response to a dynamical switch of applied electric field. These results give
access to the time-lining of piezoelectric effect on a microsecond time scale.


title:
Spin wave mode coexistence on the nano-scale: A consequence of the
  Oersted field induced asymmetric energy landscape

abstract:
  It has been argued that if multiple spin wave modes are competing for the
same centrally located energy source, as in a nanocontact spin torque
oscillator, that only one mode should survive in the steady state. Here, the
experimental conditions necessary for mode coexistence are explored. Mode
coexistence is facilitated by the local field asymmetries induced by the
spatially inhomogeneous Oersted field, which leads to a physical separation of
the modes, and is further promoted by spin wave localization at reduced applied
field angles. Finally, both simulation and experiment reveal a low frequency
signal consistent with the intermodulation of two coexistent modes.


title:
Usage-based vs. Citation-based Methods for Recommending Scholarly
  Research Articles

abstract:
  There are two principal data sources for collaborative filtering recommenders
in scholarly digital libraries: usage data obtained from harvesting a large,
distributed collection of Open URL web logs and citation data obtained from the
journal articles. This study explores the characteristics of recommendations
generated by implementations of these two methods: the 'bX' system by ExLibris
and an experimental citation-based recommender, Sarkanto. Recommendations from
each system were compared according to their semantic similarity to the seed
article that was used to generate them. Since the full text of the articles was
not available for all the recommendations in both systems, the semantic
similarity between the seed article and the recommended articles was deemed to
be the semantic distance between the journals in which the articles were
published. The semantic distance between journals was computed from the
"semantic vectors" distance between all the terms in the full-text of the
available articles in that journal and this study shows that citation-based
recommendations are more semantically diverse than usage-based ones. These
recommenders are complementary since most of the time, when one recommender
produces recommendations the other does not.


title:
New ladder operators for a rational extension of the harmonic oscillator
  and superintegrability of some two-dimensional systems

abstract:
  New ladder operators are constructed for a rational extension of the harmonic
oscillator associated with type III Hermite exceptional orthogonal polynomials
and characterized by an even integer $m$. The eigenstates of the Hamiltonian
separate into $m+1$ infinite-dimensional unitary irreducible representations of
the corresponding polynomial Heisenberg algebra. These ladder operators are
used to construct a higher-order integral of motion for two superintegrable
two-dimensional systems separable in cartesian coordinates. The polynomial
algebras of such systems provide for the first time an algebraic derivation of
the whole spectrum through their finite-dimensional unitary irreducible
representations.


title:
On-chip filter bank spectroscopy at 600-700 GHz using NbTiN
  superconducting resonators

abstract:
  We experimentally demonstrate the principle of an on-chip submillimeter wave
filter bank spectrometer, using superconducting microresonators as narrow
band-separation filters. The filters are made of NbTiN/SiNx/NbTiN microstrip
line resonators, which have a resonance frequency in the range of 614-685
GHz---two orders of magnitude higher in frequency than what is currently
studied for use in circuit quantum electrodynamics and photodetectors. The
frequency resolution of the filters decreases from 350 to 140 with increasing
frequency, most likely limited by dissipation of the resonators.


title: Anti-concentration and honest, adaptive confidence bands

abstract:
  Modern construction of uniform confidence bands for nonparametric densities
(and other functions) often relies on the classical Smirnov-Bickel-Rosenblatt
(SBR) condition; see, for example, Gin\'{e} and Nickl [Probab. Theory Related
Fields 143 (2009) 569-596]. This condition requires the existence of a limit
distribution of an extreme value type for the supremum of a studentized
empirical process (equivalently, for the supremum of a Gaussian process with
the same covariance function as that of the studentized empirical process). The
principal contribution of this paper is to remove the need for this classical
condition. We show that a considerably weaker sufficient condition is derived
from an anti-concentration property of the supremum of the approximating
Gaussian process, and we derive an inequality leading to such a property for
separable Gaussian processes. We refer to the new condition as a generalized
SBR condition. Our new result shows that the supremum does not concentrate too
fast around any value. We then apply this result to derive a Gaussian
multiplier bootstrap procedure for constructing honest confidence bands for
nonparametric density estimators (this result can be applied in other
nonparametric problems as well). An essential advantage of our approach is that
it applies generically even in those cases where the limit distribution of the
supremum of the studentized empirical process does not exist (or is unknown).
This is of particular importance in problems where resolution levels or other
tuning parameters have been chosen in a data-driven fashion, which is needed
for adaptive constructions of the confidence bands. Finally, of independent
interest is our introduction of a new, practical version of Lepski's method,
which computes the optimal, nonconservative resolution levels via a Gaussian
multiplier bootstrap method.


title:
Vortex states in nanoscale superconducting squares: the influence of
  quantum confinement

abstract:
  Bogoliubov-de Gennes theory is used to investigate the effect of the size of
a superconducting square on the vortex states in the quantum confinement
regime. When the superconducting coherence length is comparable to the Fermi
wavelength, the shape resonances of the superconducting order parameter have
strong influence on the vortex configuration. Several unconventional vortex
states, including asymmetric ones, giant multi-vortex combinations, and states
comprising giant antivortex, were found as ground states and their stability
was found to be very sensitive on the value of $k_F\xi_0$, the size of the
sample $W$, and the magnetic flux $\Phi$. By increasing the temperature and/or
enlarging the size of the sample, quantum confinement is suppressed and the
conventional mesoscopic vortex states as predicted by the Ginzburg-Laudau (GL)
theory are recovered. However, contrary to the GL results we found that the
states containing symmetry-induced vortex-antivortex pairs are stable over the
whole temperature range. It turns out that the inhomogeneous order parameter
induced by quantum confinement favors vortex-antivortex molecules, as well as
giant vortices with a rich structure in the vortex core - unattainable in the
GL domain.


title:
Quantum state tomography from sequential measurement of two variables in
  a single setup

abstract:
  We demonstrate that the task of determining an unknown quantum state can be
accomplished efficiently by making a sequential measurement of two observables
$\hat{A}$ and $\hat{B}$, provided that the two observables are chosen in such a
way that their eigenstates may form bases connected by a discrete Fourier
transform. The state can be pure or mixed, the dimension of the Hilbert space
and the coupling strength are arbitrary, and the experimental setup is fixed.
The concept of Moyal quasicharacteristic function is introduced for
finite-dimensional Hilbert spaces.


title:
Transfer reaction experiments with radioactive beams: from halos to the
  r-process

abstract:
  Transfer reactions are a powerful probe of the properties of atomic nuclei.
When used in inverse kinematics with radioactive ion beams they can provide
detailed information on the structure of exotic nuclei and can inform
nucleosynthesis calculations. There are a number of groups around the world who
use these reactions, usually with particle detection in large silicon arrays.
Sometimes these arrays are coupled to gamma-ray detectors, and occasionally
smaller arrays of silicon detectors are mounted within a solenoid magnet.
Modern techniques using transfer reactions in inverse kinematics are covered,
with specific examples, many from measurements made with beams from the
Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory.


title: Nakamaye's theorem on log canonical pairs

abstract:
  We generalize Nakamaye's description, via intersection theory, of the
augmented base locus of a big and nef divisor on a normal pair with
log-canonical singularities or, more generally, on a normal variety with non-lc
locus of dimension at most 1. We also generalize
Ein-Lazarsfeld-Mustata-Nakamaye-Popa's description, in terms of valuations, of
the subvarieties of the restricted base locus of a big divisor on a normal pair
with klt singularities.


title:
New Diluted Ferromagnetic Semiconductor isostructural to 122 type iron
  pnictide superconductor with TC up to 180 K

abstract:
  Diluted magnetic semiconductors (DMS) have received much attention due to its
potential applications to spintronics devices. A prototypical system (Ga,Mn)As
has been widely studied since 1990s. The simultaneous spin and charge doping
via hetero-valence (Ga3+,Mn2+) substitution, however, resulted in severely
limited solubility without availability of bulk specimens. Previously we
synthesized a new diluted ferromagnetic semiconductor of bulk Li(Zn,Mn)As with
Tc up to 50K, where isovalent (Zn,Mn) spin doping was separated from charge
control via Li concentrations. Here we report the synthesis of a new diluted
ferromagnetic semiconductor (Ba1-xKx)(Zn1-yMny)2As2, isostructural to iron 122
system, where holes are doped via (Ba2+, K1+), while spins via (Zn2+,Mn2+)
substitutions. Bulk samples with x=0.1-0.3 and y=0.05-0.15 exhibit
ferromagnetic order with TC up to 180K, comparable to that of record high Tc
for Ga(MnAs), significantly enhanced than Li(Zn,Mn)As. Moreover the
(Ba,K)(Zn,Mn)2As2 shares the same 122 crystal structure with semiconducting
BaZn2As2, antiferromagnetic BaMn2As2, and superconducting (Ba,K)Fe2As2, which
makes them promising to the development of multilayer functional devices.


title:
White Paper for Blazar Observations with a GEMS-like X-ray Polarimetry
  Mission

abstract:
  In this document, we describe the scientific potential of blazar observations
with a X-ray polarimetry mission like GEMS (Gravity and Extreme Magnetism
SMEX). We describe five blazar science investigations that such a mission would
enable: (i) the structure and the role of magnetic fields in AGN jets, (ii)
analysis of the polarization of the synchrotron X-ray emission from AGN jets,
(iii) discrimination between synchrotron self-Compton and external Compton
models for blazars with inverse Compton emission in the X-ray band, (iv) a
precision study of the polarization properties of the X-ray emission from
Cen-A, (v) tests of Lorentz Invariance based on X-ray polarimetric observations
of blazars. We conclude with a discussion of a straw man observation program
and recommended accompanying multiwavelength observations.


title: Optimizing Vetoes for Gravitational-wave Transient Searches

abstract:
  Interferometric gravitational-wave detectors like LIGO, GEO600 and Virgo
record a surplus of information above and beyond possible gravitational-wave
events. These auxiliary channels capture information about the state of the
detector and its surroundings which can be used to infer potential terrestrial
noise sources of some gravitational-wave-like events. We present an algorithm
addressing the ordering (or equivalently optimizing) of such information from
auxiliary systems in gravitational-wave detectors to establish veto conditions
in searches for gravitational-wave transients. The procedure was used to
identify vetoes for searches for unmodelled transients by the LIGO and Virgo
collaborations during their science runs from 2005 through 2007. In this work
we present the details of the algorithm; we also use a limited amount of data
from LIGO's past runs in order to examine the method, compare it with other
methods, and identify its potential to characterize the instruments themselves.
We examine the dependence of Receiver Operating Characteristic curves on the
various parameters of the veto method and the implementation on real data. We
find that the method robustly determines important auxiliary channels, ordering
them by the apparent strength of their correlations to the gravitational-wave
channel. This list can substantially reduce the background of noise events in
the gravitational-wave data. In this way it can identify the source of glitches
in the detector as well as assist in establishing confidence in the detection
of gravitaional-wave transients.


title: Stochastic control with rough paths

abstract:
  We study a class of controlled rough differential equations. It is shown that
the value function satisfies a HJB type equation; we also establish a form of
the Pontryagin maximum principle. Deterministic problems of this type arise in
the duality theory for controlled diffusion processes and typically involve
anticipating stochastic analysis. We propose a formulation based on rough paths
and then obtain a generalization of Roger's duality formula [L. C. G. Rogers,
2007] from discrete to continuous time. We also make the link to old work of
[Davis--Burstein, 1987].


title:
Crossover from adiabatic to antiadiabatic phonon-assisted tunneling in
  single-molecule transistors

abstract:
  The crossover between two customary limits of phonon-assisted tunneling, the
adiabatic and antiadiabatic regimes, is studied systematically in the framework
of a minimal model for molecular devices: a resonant level coupled by
displacement to a localized vibrational mode. Conventionally associated with
the limits where the phonon frequency is either sufficiently small or
sufficiently large as compared to the bare electronic hopping rate, we show
that the crossover between the two regimes is governed for strong
electron-phonon interactions primarily by the polaronic shift rather than the
phonon frequency. In particular, the perturbative adiabatic limit is approached
only as the bare hopping rate \Gamma exceeds the polaronic shift, leaving an
extended window of couplings where \Gamma well exceeds the phonon frequency and
yet the physics is basically that of the antiadiabatic regime. We term this
intermediate regime the extended antiadiabatic regime. The effective low-energy
Hamiltonian in the traditional and the extended antiadiabatic regime is shown
to be the (purely fermionic) interacting resonant-level model, with parameters
that we extract from numerical renormalization-group calculations. The extended
antiadiabatic regime is followed in turn by a true crossover region where the
polaron gets progressively undressed. The renormalized tunneling rate, which
serves as the low-energy scale in the problem and thus sets the width of the
tunneling resonance, is found to follow an approximate scaling form on going
from the adiabatic to the antiadiabatic regime. Charging properties are
governed by two distinct mechanisms at the extended antiadiabatic and into the
crossover region, giving rise to distinctive shoulders in the low-temperature
conductance as a function of gate voltage.


title: Fritz Hasenohrl and E = mc^2

abstract:
  In 1904, the year before Einstein's seminal papers on special relativity,
Austrian physicist Fritz Hasenohrl examined the properties of blackbody
radiation in a moving cavity. He calculated the work necessary to keep the
cavity moving at a constant velocity as it fills with radiation and concluded
that the radiation energy has associated with it an apparent mass such that E =
3/8 mc^2. Also in 1904, Hasenohrl achieved the same result by computing the
force necessary to accelerate a cavity already filled with radiation. In early
1905, he corrected the latter result to E = 3/4 mc^2. In this paper,
Hasenohrl's papers are examined from a modern, relativistic point of view in an
attempt to understand where he went wrong. The primary mistake in his first
paper was, ironically, that he didn't account for the loss of mass of the
blackbody end caps as they radiate energy into the cavity. However, even taking
this into account one concludes that blackbody radiation has a mass equivalent
of m = 4/3 E/c^2 or m = 5/3 E/c^2 depending on whether one equates the momentum
or kinetic energy of radiation to the momentum or kinetic energy of an
equivalent mass. In his second and third papers that deal with an accelerated
cavity, Hasenohrl concluded that the mass associated with blackbody radiation
is m = 4/3 E/c^2, a result which, within the restricted context of Hasenohrl's
gedanken experiment, is actually consistent with special relativity. Both of
these problems are non-trivial and the surprising results, indeed, turn out to
be relevant to the "4/3 problem" in classical models of the electron. An
important lesson of these analyses is that E = mc^2, while extremely useful, is
not a "law of physics" in the sense that it ought not be applied
indiscriminately to any extended system and, in particular, to the subsystems
from which they are comprised.


title: On relative $t$-designs in polynomial association schemes

abstract:
  Motivated by the similarities between the theory of spherical $t$-designs and
that of $t$-designs in $Q$-polynomial association schemes, we study two
versions of relative $t$-designs, the counterparts of Euclidean $t$-designs for
$P$- and/or $Q$-polynomial association schemes. We develop the theory based on
the Terwilliger algebra, which is a noncommutative associative semisimple
$\mathbb{C}$-algebra associated with each vertex of an association scheme. We
compute explicitly the Fisher type lower bounds on the sizes of relative
$t$-designs, assuming that certain irreducible modules behave nicely. The two
versions of relative $t$-designs turn out to be equivalent in the case of the
Hamming schemes. From this point of view, we establish a new algebraic
characterization of the Hamming schemes.


title:
Production cross sections from 82Se fragmentation as indications of
  shell effects in neutron-rich isotopes close to the drip-line

abstract:
  Production cross sections for neutron-rich nuclei from the fragmentation of a
82Se beam at 139 MeV/u were measured. The longitudinal momentum distributions
of 126 neutron-rich isotopes of elements 11 <= Z <= 32 were scanned using an
experimental approach of varying the target thickness. Production cross
sections with beryllium and tungsten targets were determined for a large number
of nuclei including several isotopes first observed in this work. These are the
most neutron-rich nuclides of the elements 22 <= Z <= 25 (64Ti, 67V, 69Cr,
72Mn). One event was registered consistent with 70Cr, and another one with
75Fe. The production cross sections are correlated with Qg systematics to
reveal trends in the data. The results presented here confirm our previous
result from a similar measurement using a 76Ge beam, and can be explained with
a shell model that predicts a subshell closure at N = 34 around Z = 20. This is
demonstrated by systematic trends and calculations with the Abrasion-Ablation
model that are sensitive to separation energies.


title:
Electrically generated surface plasmons by electroluminescence of
  individual carbon nanotube field effect transistor

abstract:
  We demonstrate the realization of an electrically-driven integrated source of
surface plasmon polaritons. Light-emitting individual single-walled carbon
nanotube field effect transistors were fabricated in a plasmonic-ready
platform. The devices were operated at ambient condition to act as an
electroluminescence source localized near the contacting gold electrodes. We
show that photon emission from the semiconducting channel can couple to
propagating surface plasmons developing in the electrical terminals.
Momentum-space spectroscopy suggests that excited plasmon modes are bound to
the metal-glass interface. Our results underline the high degree of
compatibility between state-of-the art nano-optoelectronic devices and
plasmonic architectures.


title: Galactic cluster winds in presence of a dark energy

abstract:
  We obtain a solution for the hydrodynamic outflow of the polytropic gas from
the gravitating center, in presence of the uniform Dark Energy (DE). The
antigravity of DE is enlightening the outflow and make the outflow possible at
smaller initial temperature, at the same density. The main property of the wind
in presence of DE is its unlimited acceleration after passing the critical
point. In application of this solution to the winds from galaxy clusters we
suggest that collision of the strongly accelerated wind with another galaxy
cluster, or with another galactic cluster wind could lead to the formation of a
highest energy cosmic rays.


title: Semi-classical strings in $(2+1)-$dimensional backgrounds

abstract:
  This study analyzes the geometrical relationship between a classical string
and its semi-classical quantum model. From an arbitrary $(2+1)-$dimensional
geometry, a specific ansatz for a classical string is used to generate a
semi-classical quantum model. In this framework, examples of quantum
oscillations and quantum free particles are presented that uniquely determine a
classical string and the space-time geometry where its motion takes place.


title: Phase Variation of Earthshine Polarization Spectra

abstract:
  We present the results of the optical spectropolarimetry of Earthshine on the
Moon for Earth phase angles ranging from 49 to 96 degrees. The observations
were conducted on 2011 March 9-13 (UT) using the spectropolarimeter HBS
installed on the 1.88 m telescope at Okayama Astrophysical Observatory. The
wavelength coverage was 450-850 nm with a resolution of 6 nm. The observed
Earthshine polarization degree spectra exhibit decreasing polarization degree
with increasing wavelength at any phase. The overall degree of polarization
increases as the Earth approaches a quadrature phase. The phase dependence
differs with the wavelengths; the maximum polarization for the V band occurs at
a phase angle of ~90 degrees, whereas that for longer wavelengths is reached at
larger phase angles. This is interpreted as indicating that Earthshine
polarization at shorter wavelengths is dominated by atmospheric Rayleigh
scattering, whereas that at longer wavelengths has an increasingly effective
contribution from the Earth surface reflection. The wavelength dependence of
the phase angle of the maximum polarization appears to be unique among the
terrestrial planetary bodies in the Solar System. Therefore this might
constitute important evidence pointing toward a distinctive characteristic of
the Earth: the planet has a scattering but transparent atmosphere above its
surface.


title:
Loschmidt echo and the many-body orthogonality catastrophe in a
  qubit-coupled Luttinger liquid

abstract:
  We investigate the many-body generalization of the orthogonality catastrophe
by studying the generalized Loschmidt echo of Luttinger liquids (LLs) after a
global change of interaction. It decays exponentially with system size and
exhibits universal behaviour: the steady state exponent after quenching back
and forth n-times between 2 LLs (bang-bang protocol) is 2n-times bigger than
that of the adiabatic overlap, and depends only on the initial and final LL
parameters. These are corroborated numerically by matrix-product state based
methods of the XXZ Heisenberg model. An experimental setup consisting of a
hybrid system containing cold atoms and a flux qubit coupled to a Feshbach
resonance is proposed to measure the Loschmidt echo using rf spectroscopy or
Ramsey interferometry.


title:
Pinching estimates for solutions of the linearized Ricci flow system in
  higher dimensions

abstract:
  We prove pinching estimates for solutions of the linearized Ricci flow system
on a closed manifold of dimension $n\geq 4$ with positive scalar curvature and
vanishing Weyl tensor. If the vanishing Weyl tensor condition is removed, we
only give a rough pinching estimate controlled by some blow-up function in a
short time. These results extend the $3$-dimensional case due to Anderson and
Chow (2005) \cite{[AC]}.


title:
Characterization of the Nearby L/T Binary Brown Dwarf WISE
  J104915.57-531906.1 at 2 Parsecs from the Sun

abstract:
  WISE J104915.57$-$531906.1 is a L/T brown dwarf binary located 2pc from the
Sun. The pair contains the closest known brown dwarfs and is the third closest
known system, stellar or sub-stellar. We report comprehensive follow-up
observations of this newly uncovered system. We have determined the spectral
types of both components (L8+/-1, for the primary, agreeing with the discovery
paper; T1.5+/-2 for the secondary, which was lacking spectroscopic type
determination in the discovery paper) and, for the first time, their radial
velocities (V_rad~23.1, 19.5 km/s) using optical spectra obtained at the
Southern African Large Telescope (SALT) and other facilities located at the
South African Astronomical Observatory (SAAO). The relative radial velocity of
the two components is smaller than the range of orbital velocities for
theoretically predicted masses, implying that they form a gravitationally bound
system. We report resolved near-infrared JHK_S photometry from the IRSF
telescope at the SAAO which yields colors consistent with the spectroscopically
derived spectral types. The available kinematic and photometric information
excludes the possibility that the object belongs to any of the known nearby
young moving groups or associations. Simultaneous optical polarimetry
observations taken at the SAAO 1.9-m give a non-detection with an upper limit
of 0.07%. For the given spectral types and absolute magnitudes, 1Gyr
theoretical models predict masses of 0.04--0.05 M_odot for the primary, and
0.03--0.05 M_odot for the secondary.


title:
Low-Temperature Hopping Dynamics with Energy Disorder: Renormalization
  Group Approach

abstract:
  We formulate a real-space renormalization group (RG) approach for efficient
numerical analysis of the low-temperature hopping dynamics in energy-disordered
lattices. The approach explicitly relies on the time-scale separation of the
trapping/escape dynamics. This time-scale separation allows to treat the
hopping dynamics as a hierarchal process, an RG step being a transformation
between the levels of the hierarchy. We apply the proposed RG approach to
analyze hopping dynamics in one- and two-dimensional lattices with varying
degree of energy disorder, and find the approach to be more accurate at low
temperatures and computationally much faster, than the direct diagonalization.
Applicability criteria of the proposed approach with respect to the time-scale
separation and the maximum number of hierarchy levels are formulated. RG flows
of energy distribution and preexponents of the Miller-Abrahams model are
analyzed.


title:
Distributed reactive power feedback control for voltage regulation and
  loss minimization

abstract:
  We consider the problem of exploiting the microgenerators dispersed in the
power distribution network in order to provide distributed reactive power
compensation for power losses minimization and voltage regulation. In the
proposed strategy, microgenerators are smart agents that can measure their
phasorial voltage, share these data with the other agents on a cyber layer, and
adjust the amount of reactive power injected into the grid, according to a
feedback control law that descends from duality-based methods applied to the
optimal reactive power flow problem. Convergence to the configuration of
minimum losses and feasible voltages is proved analytically for both a
synchronous and an asynchronous version of the algorithm, where agents update
their state independently one from the other. Simulations are provided in order
to illustrate the performance and the robustness of the algorithm, and the
innovative feedback nature of such strategy is discussed.


title: Parametric four-wave mixing using a single cw laser

abstract:
  Four-wave mixing can be used to generate coherent output beams, with
frequencies difficult to acquire in commercial lasers. Here a single narrow
ECDL locked to the two photon 5s-5d transition in rubidium is combined with a
tapered amplifier system to produce a high power cw beam at 778 nm and used to
generate coherent light at 420 nm through parametric four-wave mixing. This
process is analyzed in terms of the the intensity and frequency of the incoming
beam as well as the atomic density of the sample. The efficiency of the process
is currently limited when on resonance due to the absorption of the 420 nm
beam, and modifications should allow a significant increase in output power.


title: Time-dependent factorial cumulants in interacting nano-scale systems

abstract:
  We discuss time-dependent factorial cumulants in interacting nano-scale
systems. Recent theoretical work has shown that the full counting statistics of
non-interacting electrons in a two-terminal conductor is always generalized
binomial and the zeros of the generating function are consequently real and
negative. However, as interactions are introduced in the transport, the zeros
of the generating function may become complex. This has measurable
consequences: With the zeros of the generating function moving away from the
real-axis, the high-order factorial cumulants of the transport become
oscillatory functions of time. Here we demonstrate this phenomenon on a model
of charge transport through coherently coupled quantum dots attached to
voltage-biased electrodes. Without interactions, the factorial cumulants are
monotonic functions of the observation time. In contrast, as interactions are
introduced, the factorial cumulants oscillate strongly as functions of time. We
comment on possible measurements of oscillating factorial cumulants and outline
several avenues for further investigations.


title: Harmonic maps into the exceptional symmetric space $G_2/SO(4)$

abstract:
  We show that a harmonic map from a Riemann surface into the exceptional
symmetric space $G_2/{\mathrm SO}(4)$ has a $J_2$-holomorphic twistor lift into
one of the three flag manifolds of $G_2$ if and only if it is `nilconformal',
i.e., has nilpotent derivative. Then we find relationships with almost complex
maps from a surface into the 6-sphere; this enables us to construct examples of
nilconformal harmonic maps into $G_2/{\mathrm SO}(4)$ which are not of finite
uniton number, and which have lifts into any of the three twistor spaces.
Harmonic maps of finite uniton number are all nilconformal; for such maps, we
show that our lifts can be constructed explicitly from extended solutions.


title: High-frequency market-making for multi-dimensional Markov processes

abstract:
  In this paper we complete and extend our previous work on stochastic control
applied to high frequency market-making with inventory constraints and
directional bets. Our new model admits several state variables (e.g. market
spread, stochastic volatility and intensities of market orders) provided the
full system is Markov. The solution of the corresponding HJB equation is exact
in the case of zero inventory risk. The inventory risk enters into play in two
ways: a path-dependent penalty based on the volatility and a penalty at expiry
based on the market spread. We perform perturbation methods on the inventory
risk parameter and obtain explicitly the solution and its controls up to first
order. We also include transaction costs; we show that the spread of the
market-maker is widened to compensate the transaction costs, but the expected
gain per traded spread remains constant. We perform several numerical
simulations to assess the effect of the parameters on the PNL, showing in
particular how the directional bet and the inventory risk change the shape of
the PNL density. Finally, we extend our results to the case of multi-aset
market-making strategies; we show that the correct notion of inventory risk is
the L2-norm of the (multi-dimensional) inventory with respect to the inventory
penalties.


title: A Realistic Pattern of Lepton Mixing and Masses from S4 and CP

abstract:
  We present a supersymmetric model with the flavour symmetry S4 x Z3 and a CP
symmetry which are broken to a Z3 subgroup of the flavour symmetry in the
charged lepton sector and to Z2 x CP (x Z3) in the neutrino one at leading
order. This model implements an approach, capable of predicting lepton mixing
angles and Dirac as well as Majorana phases in terms of one free parameter.
This parameter, directly related to the size of the reactor mixing angle
theta_{13}, can be naturally of the correct order in our model. Atmospheric
mixing is maximal, while sin^2 theta_{12} is larger than 1/3. All three phases
are predicted: the Dirac phase is maximal, whereas the two Majorana phases are
trivial. The neutrino mass matrix contains only three real parameters at
leading order and neutrino masses effectively only depend on two of them. As a
consequence, they have to be normally ordered and the absolute neutrino mass
scale and the sum of the neutrino masses are predicted. The vacuum of the
flavons can be correctly aligned. We study subleading corrections to the
leading order results and show that they are small.


title: Efficient Computation of the Kauffman Bracket

abstract:
  This paper bounds the computational cost of computing the Kauffman bracket of
a link in terms of the crossing number of that link. Specifically, it is shown
that the image of a tangle with $g$ boundary points and $n$ crossings in the
Kauffman bracket skein module is a linear combination of $O(2^g)$ basis
elements, with each coefficient a polynomial with at most $n$ nonzero terms,
each with integer coefficients, and that the link can be built one crossing at
a time as a sequence of tangles with maximum number of boundary points bounded
by $C\sqrt{n}$ for some $C.$ From this it follows that the computation of the
Kauffman bracket of the link takes time and memory a polynomial in $n$ times
$2^{C\sqrt{n}}.$


title: Matrix weights, Littlewood Paley inequalities and the Riesz transforms

abstract:
  We discuss weighted estimates for the squares of the Riesz transforms, R^{2},
on L^{2}(W) where W is a matrix A2 weight. We prove that if W is close to the
Identity matrix Id, then the operator norm of R^{2} is close to its unweighted
norm on L^{2} which is one. This is done by the use of the Bellman function
technique.


title:
G-Character varieties for G=SO(n,C) and other not simply connected
  groups

abstract:
  We describe the relation between G-character varieties, $X_G(\Gamma)$, and
$G/H$-character varieties, where $H$ is a finite, central subgroup of $G.$ In
particular, we find finite generating sets of coordinate rings
$C[X_{G/H}(\Gamma)]$ for classical groups $G$ and $H$ as above. Using this
approach we find an explicit description of $C[X_{SO(4,C)}(F_2)]$ for the free
group on two generators, $F_2.$
  In the second part of the paper, we prove several properties of
SO(2n,C)-character varieties. This is a particularly interesting class of
character varieties because unlike for all other classical groups G, the
coordinate rings $C[X_{G}(\Gamma)]$ are generally not generated by trace
functions $\tau_\gamma$, for $\gamma\in \Gamma$, for G=SO(2n,C). In fact, we
prove that the coordinate ring $C[X_{SO(2n,C)}(\Gamma)]$ is not even generated
by "generalized trace functions," $\tau_{\gamma,V},$ for all $\gamma\in \Gamma$
and all representations $V$ of $SO(2n,C)$ for $n=2$ and groups $\Gamma$ of
corank $\geq 2$.


title:
A solution space for a system of null-state partial differential
  equations 3

abstract:
  This article is the third of four that completely characterize a solution
space $\mathcal{S}_N$ for a homogeneous system of $2N+3$ linear partial
differential equations (PDEs) in $2N$ variables that arises in conformal field
theory (CFT) and multiple Schramm-Lowner evolution (SLE). The system comprises
$2N$ null-state equations and three conformal Ward identities that govern CFT
correlation functions of $2N$ one-leg boundary operators. In the previous two
articles (parts I and II), we use methods of analysis and linear algebra to
prove that $\dim\mathcal{S}_N\leq C_N$, with $C_N$ the $N$th Catalan number.
  Extending these results, we prove in this article that
$\dim\mathcal{S}_N=C_N$ and $\mathcal{S}_N$ entirely consists of (real-valued)
solutions constructed with the CFT Coulomb gas (contour integral) formalism. In
order to prove this claim, we show that a certain set of $C_N$ such solutions
is linearly independent. Because the formulas for these solutions are
complicated, we prove linear independence indirectly. We use the linear
injective map of lemma 15 in part I to send each solution of the mentioned set
to a vector in $\mathbb{R}^{C_N}$, whose components we find as inner products
of elements in a Temperley-Lieb algebra. We gather these vectors together as
columns of a symmetric $C_N$ by $C_N$ matrix, with the form of a meander
matrix. If the determinant of this matrix does not vanish, then the set of
$C_N$ Coulomb gas solutions is linearly independent. And if this determinant
does vanish, then we construct an alternative set of $C_N$ Coulomb gas
solutions and follow a similar procedure to show that this set is linearly
independent. The latter situation is closely related to CFT minimal models.

categories: math-ph cond-mat.stat-mech hep-th math.MP


title:
Non-existence of local solutions for semilinear heat equations of Osgood
  type

abstract:
  We establish non-existence results for the Cauchy problem of some semilinear
heat equations with non-negative initial data and locally Lipschitz,
nonnegative source term $f$. Global (in time) solutions of the scalar ODE $\dot
v=f(v)$ exist for $v(0)>0$ if and only if the Osgood-type condition
$\int_{1}^{\infty}\frac{\dee s}{f(s)} =\infty$ holds; by comparison this
ensures the existence of global classical solutions of $u_t=\Delta u+f(u)$ for
bounded initial data $u_0\in L^{\infty}(\R^n)$. It is natural to ask whether
the Osgood condition is sufficient to ensure that the problem still admits
global solutions if the initial data is in $L^q(\R^n)$ for some $1\le
q<\infty$. Here we answer this question in the negative, and in fact show that
there are initial conditions for which there exists no local solution in
$L^1_{\rm loc}(\R^n)$ for $t>0$.


title:
On continuity equations in infinite dimensions with non-Gaussian
  reference measure

abstract:
  Let $\gamma$ be a Gaussian measure on a locally convex space and $H$ be the
corresponding Cameron-Martin space. It has been recently shown by L. Ambrosio
and A. Figalli that the linear first-order PDE $$ \dot{\rho} +
\mbox{div}_{\gamma} (\rho \cdot {b}) =0, \ \ \rho|_{t=0} = \rho_0, $$ where
$\rho_0 \cdot \gamma $ is a probability measure, admits a weak solution, in
particular, under the following assumptions: $$ \|b\|_{H} \in L^p(\gamma), \
p>1, \ \ \ \exp\bigl(\varepsilon(\mbox{\rm div}_{\gamma} b)_{-} \bigr) \in
L^1(\gamma). $$ Applying transportation of measures via triangular maps we
prove a similar result for a large class of non-Gaussian probability measures
$\nu$ on $\R^{\infty}$, under the main assumption that $\beta_i \in \cap_{n \in
\Nat} L^{n}(\nu)$ for every $i \in \Nat$, where $\beta_i$ is the logarithmic
derivative of $\nu$ along the coordinate $x_i$.
  We also show uniqueness of the solution for a wide class of measures. This
class includes uniformly log-concave Gibbs measures and certain product
measures. measures.


title: Noncommutative gauge theories on $\mathbb{R}^2_\theta$ as matrix models

abstract:
  We study a class of noncommutative gauge theory models on 2-dimensional Moyal
space from the viewpoint of matrix models and explore some related properties.
Expanding the action around symmetric vacua generates non local matrix models
with polynomial interaction terms. For a particular vacuum, we can invert the
kinetic operator which is related to a Jacobi operator. The resulting
propagator can be expressed in terms of Chebyschev polynomials of second kind.
We show that non vanishing correlations exist at large separations. General
considerations on the kinetic operators stemming from the other class of
symmetric vacua, indicates that only one class of symmetric vacua should lead
to fast decaying propagators. The quantum stability of the vacuum is briefly
discussed.


title:
Large-Scale Automatic Reconstruction of Neuronal Processes from Electron
  Microscopy Images

abstract:
  Automated sample preparation and electron microscopy enables acquisition of
very large image data sets. These technical advances are of special importance
to the field of neuroanatomy, as 3D reconstructions of neuronal processes at
the nm scale can provide new insight into the fine grained structure of the
brain. Segmentation of large-scale electron microscopy data is the main
bottleneck in the analysis of these data sets. In this paper we present a
pipeline that provides state-of-the art reconstruction performance while
scaling to data sets in the GB-TB range. First, we train a random forest
classifier on interactive sparse user annotations. The classifier output is
combined with an anisotropic smoothing prior in a Conditional Random Field
framework to generate multiple segmentation hypotheses per image. These
segmentations are then combined into geometrically consistent 3D objects by
segmentation fusion. We provide qualitative and quantitative evaluation of the
automatic segmentation and demonstrate large-scale 3D reconstructions of
neuronal processes from a $\mathbf{27,000}$ $\mathbf{\mu m^3}$ volume of brain
tissue over a cube of $\mathbf{30 \; \mu m}$ in each dimension corresponding to
1000 consecutive image sections. We also introduce Mojo, a proofreading tool
including semi-automated correction of merge errors based on sparse user
scribbles.


title:
Role of the phase-matching condition in non-degenerate four-wave mixing
  in hot vapors for the generation of squeezed states of light

abstract:
  Non-degenerate forward four-wave mixing in hot atomic vapors has been shown
to produce strong quantum correlations between twin beams of light [McCormick
et al, Opt. Lett. 32, 178 (2007)], in a configuration which minimizes losses by
absorption. In this paper, we look at the role of the phase-matching condition
in the trade-off that occurs between the efficiency of the nonlinear process
and the absorption of the twin beams. To this effect, we develop a
semi-classical model by deriving the atomic susceptibilities in the relevant
double-lambda configuration and by solving the classical propagation of the
twin-beam fields for parameters close to those found in typical experiments.
These theoretical results are confirmed by a simple experimental study of the
nonlinear gain experienced by the twin beams as a function of the phase
mismatch. The model shows that the amount of phase mismatch is key to the
realization of the physical conditions in which the absorption of the twin
beams is minimized while the cross-coupling between the twin beams is
maintained at the level required for the generation of strong quantum
correlations. The optimum is reached when the four-wave mixing process is not
fully phase matched.


title: Observation of giant magnetocaloric effect in HoCoSi

abstract:
  We report the magnetic and magnetocaloric properties of HoCoSi, which shows
second order ferro-para magnetic transition at 14 K. It is found to exhibit a
large magnetic entropy change of 13 J/kg K for a field change of 20 kOe, which
increases to 20.5 J/kg K at 50 kOe. The refrigerant capacity is found to be 135
and 410 J/kg for 20 and 50 kOe, respectively. The large, low-field adiabatic
temperature change (~ 3 K) and a large refrigerant capacity make this compound
a suitable candidate for magnetic refrigeration applications at around 15 K.


title:
The combinatorial multitude of fatty acids can be described by Fibonacci
  numbers

abstract:
  The famous series of Fibonacci numbers is defined by a recursive equation
saying that each number is the sum of its two predecessors, with the initial
condition that the first two numbers are equal to unity. Here, we show that the
numbers of fatty acids (straight-chain aliphatic monocarboxylic acids) with n
carbon atoms is exactly given by the Fibonacci numbers. Thus, by investing one
more carbon atom into extending a fatty acid, an organism can increase the
variability of the fatty acids approximately by the factor of the Golden
section, 1.618. As the Fibonacci series grows asymptotically exponentially, our
results are in line with combinatorial complexity found generally in biology.
We also outline potential extensions of the calculations to modified (e.g.,
hydroxylated) fatty acids. The presented enumeration method may be of interest
for lipidomics, combinatorial chemistry, synthetic biology and the theory of
evolution (including prebiotic evolution).


title:
Ab initio calculations of the optical absorption spectra of
  C60-conjugated polymer hybrids

abstract:
  A recently developed linear-scaling density-functional theory (LS-DFT)
formalism is used to calculate optical absorption spectra of hybrids of C60 and
the conjugated polymers poly(para-phenylene) (PPP) and poly(para-phenylene
vinylene) (PPV). The use of a LS formalism allows calculations on large systems
with realistic proportions of C60, which has been of interest for the use of
such materials in photovoltaics. Two different bonding structures are tested
for the hybrid PPP and for both systems additional peaks are present in the
absorption spectra below the original onset of absorption. By identifying the
eigenstates involved in the relevant transitions, a weighted density difference
is formed, demonstrating the transfer of charge between the polymer chain and
the C60, in agreement with experiment. For the hybrid PPV, no additional peaks
are observed in the absorption spectrum.


title:
Understanding the Effect of Atmospheric Density on the Cosmic Ray Flux
  Variations at the Earth Surface

abstract:
  We report in this letter for the first time the numerical simulations of muon
and neutron flux variations at the surface of the earth with varying air
densities in the troposphere and stratosphere. The simulated neutron and muon
flux variations are in very good agreement with the measured neutron flux
variation in Oulu and the muon flux variation in Atlanta. We conclude from this
study that the stratosphere air density variation dominates the effects on the
muon flux changes while the density variation in troposphere mainly influences
the neutron count variation. These results pave a new path for systematically
studying the global temperature evolution using worldwide cosmic ray data.


title:
Axial Current Generation from Electric Field: Chiral Electric Separation
  Effect

abstract:
  We study a relativistic plasma containing charged chiral fermions in an
external electric field. We show that with the presence of both vector and
axial charge densities, the electric field can induce an axial current along
its direction and thus cause chirality separation. We call it the Chiral
Electric Separation Effect (CESE). On very general basis, we argue that the
strength of CESE is proportional to $\mu_V\mu_A$ with $\mu_V$ and $\mu_A$ the
chemical potentials for vector charge and axial charge. We then explicitly
calculate this CESE conductivity coefficient in thermal QED at leading-log
order. The CESE can manifest a new gapless wave mode propagating along the
electric field. Potential observable of CESE in heavy-ion collisions is also
discussed.


title: On magnetic-field-induced dissipationless electric current in nanowires

abstract:
  We propose a general design of a metallic double-nanowire structure which may
support an equilibrium dissipationless electric current in the presence of
magnetic field. The structure consists of a compact wire element of a specific
shape, which is periodically extended in one spatial dimension. Topologically,
each wire element is equivalent to a ring, which supports a dissipationless
current in the presence of magnetic flux similarly to the persistent electric
current in a normal metal nanoring. Geometrically, each wire element breaks
spatial inversion symmetry so that the equilibrium electric current through the
device becomes nonzero. We also argue that the same effect should exist in long
planar chiral nanoribbons subjected to external magnetic field.


title: Evidence for AGN-driven Outflows in Young Radio Quasars

abstract:
  We present near-infrared spectra of young radio quasars [P(1.4GHz) ~ 26-27
W/Hz] selected from the Wide-Field Infrared Survey Explorer. The detected
objects have typical redshifts of z ~ 1.6-2.5 and bolometric luminosities ~
10^47 erg/s. Based on the intensity ratios of narrow emission lines, we find
that these objects are mainly powered by active galactic nuclei (AGNs),
although star formation contribution cannot be completely ruled out. The host
galaxies experience moderate levels of extinction, A(V) ~ 0-1.3 mag. The
observed [O III] luminosities and rest-frame J-band magnitudes constrain the
black hole masses to lie in the range ~ 10^8.9-10^9.7 solar mass. From the
empirical correlation between black hole mass and host galaxy mass, we infer
stellar masses of ~ 10^11.3-10^12.2 solar mass. The [O III] line is
exceptionally broad, with full width at half maximum ~1300 to 2100 km/s,
significantly larger than that of ordinary distant quasars. We argue that these
large line widths can be explained by jet-induced outflows, as predicted by
theoretical models of AGN feedback.


title: Parallelization in Scientific Workflow Management Systems

abstract:
  Over the last two decades, scientific workflow management systems (SWfMS)
have emerged as a means to facilitate the design, execution, and monitoring of
reusable scientific data processing pipelines. At the same time, the amounts of
data generated in various areas of science outpaced enhancements in
computational power and storage capabilities. This is especially true for the
life sciences, where new technologies increased the sequencing throughput from
kilobytes to terabytes per day. This trend requires current SWfMS to adapt:
Native support for parallel workflow execution must be provided to increase
performance; dynamically scalable "pay-per-use" compute infrastructures have to
be integrated to diminish hardware costs; adaptive scheduling of workflows in
distributed compute environments is required to optimize resource utilization.
In this survey we give an overview of parallelization techniques for SWfMS,
both in theory and in their realization in concrete systems. We find that
current systems leave considerable room for improvement and we propose key
advancements to the landscape of SWfMS.


title: On Solutions to Cournot-Nash Equilibria Equations on the Sphere

abstract:
  We discuss equations associated to Cournot-Nash Equilibria as put forward
recently by Blanchet and Carlier. These equations are related to an optimal
transport problem in which the source measure is known, but the target measure
is part of the problem. The resulting equation is a Monge-Amp\`ere type with
possible nonlocal terms. If the cost function is of a particular form, the
equation is vulnerable to standard optimal transportation PDE techniques, with
some modifications to deal with the new terms. We give some conditions on the
problem from which we can conclude that solutions are smooth.


title: Network Codes for Real-Time Applications

abstract:
  We consider the scenario of broadcasting for real-time applications and loss
recovery via instantly decodable network coding. Past work focused on
minimizing the completion delay, which is not the right objective for real-time
applications that have strict deadlines. In this work, we are interested in
finding a code that is instantly decodable by the maximum number of users.
First, we prove that this problem is NP-Hard in the general case. Then we
consider the practical probabilistic scenario, where users have i.i.d. loss
probability and the number of packets is linear or polynomial in the number of
users. In this scenario, we provide a polynomial-time (in the number of users)
algorithm that finds the optimal coded packet. The proposed algorithm is
evaluated using both simulation and real network traces of a real-time Android
application. Both results show that the proposed coding scheme significantly
outperforms the state-of-the-art baselines: an optimal repetition code and a
COPE-like greedy scheme.


title: Harmonic functions of general graph Laplacians

abstract:
  We study harmonic functions on general weighted graphs which allow for a
compatible intrinsic metric. We prove an $L^{p}$ Liouville type theorem which
is a quantitative integral $L^{p}$ estimate of harmonic functions analogous to
Karp's theorem for Riemannian manifolds. As corollaries we obtain Yau's
$L^{p}$-Liouville type theorem on graphs, identify the domain of the generator
of the semigroup on $L^{p}$ and get a criterion for recurrence. As a side
product, we show an analogue of Yau's $L^{p}$ Caccioppoli inequality.
Furthermore, we derive various Liouville type results for harmonic functions on
graphs and harmonic maps from graphs into Hadamard spaces.


title:
Quasielastic and multinucleon excitations in antineutrino-nucleus
  interactions

abstract:
  We investigate the MiniBooNE recent data on the antineutrino nucleus
interaction, using the same theoretical description with the same parameters as
in previous works on neutrino interactions. The double differential
quasielastic cross section, which is free from the energy reconstruction
problem, is well reproduced by our model once the multinucleon excitations are
incorporated. A similar agreement is achieved for the Q^2 distribution.


title: Design for a Darwinian Brain: Part 1. Philosophy and Neuroscience

abstract:
  Physical symbol systems are needed for open-ended cognition. A good way to
understand physical symbol systems is by comparison of thought to chemistry.
Both have systematicity, productivity and compositionality. The state of the
art in cognitive architectures for open-ended cognition is critically assessed.
I conclude that a cognitive architecture that evolves symbol structures in the
brain is a promising candidate to explain open-ended cognition. Part 2 of the
paper presents such a cognitive architecture.


title: Design for a Darwinian Brain: Part 2. Cognitive Architecture

abstract:
  The accumulation of adaptations in an open-ended manner during lifetime
learning is a holy grail in reinforcement learning, intrinsic motivation,
artificial curiosity, and developmental robotics. We present a specification
for a cognitive architecture that is capable of specifying an unlimited range
of behaviors. We then give examples of how it can stochastically explore an
interesting space of adjacent possible behaviors. There are two main novelties;
the first is a proper definition of the fitness of self-generated games such
that interesting games are expected to evolve. The second is a modular and
evolvable behavior language that has systematicity, productivity, and
compositionality, i.e. it is a physical symbol system. A part of the
architecture has already been implemented on a humanoid robot.


title: Quantum 3D Tensionless String in Light-cone Gauge

abstract:
  We discuss the quantization of a tensionless closed string in light-cone
gauge. It is known that by using a Hamiltonian BRST scheme the tensionless
p-branes have no Lorentz anomaly in any space-time dimensions and no anomaly of
space-time conformal symmetry in two dimensions. In this paper, we show that
tensionless 3d strings in light-cone gauge also have no anomaly of space-time
conformal symmetry. We also study the spectrum of a tensionless 3d closed
string.


title: Quantum binary polyhedral groups and their actions on quantum planes

abstract:
  We classify quantum analogues of actions of finite subgroups G of SL_2(k) on
commutative polynomial rings k[u,v]. More precisely, we produce a
classification of pairs (H,R), where H is a finite dimensional Hopf algebra
that acts inner faithfully and preserves the grading of an Artin-Schelter
regular algebra R of global dimension two. Remarkably, the corresponding
invariant rings R^H share similar regularity and Gorenstein properties as the
invariant rings k[u,v]^G in the classic setting. We also present several
questions and directions for expanding this work in noncommutative invariant
theory.


title:
Monte Carlo simulations on the Lefschetz thimble: taming the sign
  problem

abstract:
  We present the first practical Monte Carlo calculations of the recently
proposed Lefschetz thimble formulation of quantum field theories. Our results
provide strong evidence that the numerical sign problem that afflicts Monte
Carlo calculations of models with complex actions can be softened significantly
by changing the domain of integration to the Lefschetz thimble or
approximations thereof. We study the interacting complex scalar field theory
(relativistic Bose gas) in lattices of size up to 8^4 using a computationally
inexpensive approximation of the Lefschetz thimble. Our results are in
excellent agreement with known results. We show that - at least in the case of
the relativistic Bose gas - the thimble can be systematically approached and
the remaining residual phase leads to a much more tractable sign problem (if at
all) than the original formulation. This is especially encouraging in view of
the wide applicability - in principle - of our method to quantum field theories
with a sign problem. We believe that this opens up new possibilities for
accurate Monte Carlo calculations in strongly interacting systems of sizes much
larger that previously possible.

categories: hep-lat cond-mat.stat-mech cond-mat.str-el nucl-th physics.comp-ph


title:
Winkler's Hat Guessing Game: Better Results for Imbalanced Hat
  Distributions

abstract:
  In this note, we give an explicit polynomial-time executable strategy for
Peter Winkler's hat guessing game that gives superior results if the
distribution of hats is imbalanced. While Winkler's strategy guarantees in any
case that $\lfloor n/2 \rfloor$ of the $n$ player guess their hat color
correct, our strategy ensures that the players produce $\max\{r,b\} - 1.2
n^{2/3} -2$ correct guesses for any distribution of $r$ red and $b = n - r$
blue hats. We also show that any strategy ensuring $\max\{r,b\} - f(n)$ correct
guesses necessarily has $f(n) = \Omega(\sqrt n)$.


title:
Ripple effects & oscillations in the broad FeKa line as a probe of
  massive black hole mergers

abstract:
  (abridged) When a sufficiently massive satellite (or secondary) black hole is
embedded in a gas disk around a (primary) supermassive black hole, it can open
an empty gap in the disk. A gap-opening secondary close to the primary will
leave an imprint in the broad component of the FeKa emission line, which varies
in a unique and predictable manner. If the gap persists into the innermost
disk, the effect consists of a pair of dips in the broad line which ripple
blue-ward and red-ward from the line centroid energy respectively, as the gap
moves closer to the primary. This ripple effect could be unambiguously
detectable and allow an electromagnetic monitoring of massive black hole
mergers as they occur. As the mass ratio of the secondary to primary black hole
increases to q>0.01, we expect the gap to widen, possibly clearing a central
cavity in the inner disk, which shows up in the broad FeKa line component. If
the secondary stalls at >100r_{g} in its in-migration, due to low co-rotating
gas mass, a detectable ripple effect occurs in the broad line component on the
disk viscous timescale as the inner disk drains and the outer disk is dammed.
If the secondary maintains an accretion disk within a central cavity, due to
dam bursting or leakage, a periodic 'see-saw' oscillation effect is exhibited
in the observed line profile. Here we demonstrate the range of ripple effect
signatures potentially detectable with Astro-H and IXO/Athena, and oscillation
effects potentially detectable with XMM or LOFT for a wide variety of merger
and disk conditions. Observations of the ripple effect and periodic
oscillations can be used to provide an early warning of gravitational radiation
emission from the AGN.


title: Orbital entanglement in bond-formation processes

abstract:
  The accurate calculation of the (differential) correlation energy is central
to the quantum chemical description of bond-formation and bond-dissociation
processes. In order to estimate the quality of single- and multi-reference
approaches for this purpose, various diagnostic tools have been developed. In
this work, we elaborate on our previous observation [J. Phys. Chem. Lett. 3,
3129 (2012)] that one- and two-orbital-based entanglement measures provide
quantitative means for the assessment and classification of electron
correlation effects among molecular orbitals. The dissociation behavior of some
prototypical diatomic molecules features all types of correlation effects
relevant for chemical bonding. We demonstrate that our entanglement analysis is
convenient to dissect these electron correlation effects and to provide a
conceptual understanding of bond-forming and bond-breaking processes from the
point of view of quantum information theory.

categories: physics.chem-ph cond-mat.str-el physics.atm-clus physics.comp-ph quant-ph


title: Human-Human interaction: epidemiology

abstract:
  The aim of this work was to show few examples and few perspective of modeling
in epidemiology. We began with differential equations which were a first tool
to describe and predict that phenomena. Wroclaw as a cite was very important,
because statistics from smallpox epidemic were used by Bernoulli to estimate
parameters of first mathematical model of epidemic. Next step were SIR models
and those also appeared first as differential equations. They were very popular
in begin of XX century. When computer simulation changed the world of
mathematical modeling agent-based models gave more possibilities in
epidemiology. That models have a big privilege on differential equation,
because of information of social network people habits and reaction on
infections, which can me involved in agent-based models as well as governmental
intervention. We showed in this work how that human relations are important in
transmitting diseases and there is example, where it is possible to conduct
experiments of significant policy relevance (vaccinating), such as
investigating the initial growth of an epidemic on a real-world network.
Presented H1N1 model could be observed in real time (prediction was made in
September 2009 for winter season 2009/2010) what make it more exiting and also
practice.


title: Slow relaxation and aging phenomena at nano-scale in granular materials

abstract:
  Complex systems having metastable elements often demonstrate nearly log-time
relaxations and a kind of aging: repeated stimuli weaken the system's
relaxational response. Granular matter is known to exhibit a wealth of such
behaviors, for which the role of thermal fluctuations is usually ignored.
However, we demonstrate that the latter can pronouncedly affect contacting
mesoscopic-scale asperities and be macroscopically observed via appropriate
acoustic effects. We also propose a mechanism comprising slow relaxations and
aging as intrinsic properties of a wide class of systems with metastable
states.


title: Gauge Invariant Descriptions of Gluon Polarizations Revisited

abstract:
  We examine the feasibility of gauge invariant descriptions of the gluon
polarization following the proposal that a gauge field can be decomposed into
its physical part and its pure gauge part. We show that gauge invariant angular
momentum currents can be constructed from summations of gauge variant Noether
currents. We present novel expressions of the pure gauge field, which are used
to formulate gauge invariant descriptions of the gluon spin and the photon
spin. We show that the gauge invariant extension of the Chern-Simons current
can describe the spins of the Laguerre-Gauss laser modes. We also discuss the
relation of gauge invariant operators and the parton distributions constructed
from Dirac variables.


title: Striped phases from holography

abstract:
  We discuss new types of second order phase transitions in holography by
constructing striped black holes in D=4 with $AdS_{4}$ asymptotics. In the
context of $AdS/CFT$, they provide the gravity duals to field theory phases in
which translational symmetry is spontaneously broken due to the formation of
current density waves. These black holes are associated to three dimensional
CFTs at finite temperature and deformed by a uniform chemical potential. We
numerically solve a non-linear system of PDEs in order to construct the black
hole geometries and extract some of their thermodynamic properties.


title:
Forecasts for CMB \mu- and i-type spectral distortion constraints on the
  primordial power spectrum on scales 8 < k < 10^4 Mpc^-1 with the future
  Pixie-like experiments

abstract:
  Silk damping at redshifts 1.5 x 10^4 < z < 2 x 10^6 erases CMB anisotropies
on scales corresponding to the comoving wavenumbers 8 < k < 10^4 Mpc^-1 (10^5 <
\ell < 10^8). This dissipated energy is gained by the CMB monopole, creating
distortions from a blackbody in the CMB spectrum of the \mu-type and the
i-type. We study, using Fisher matrices, the constraints we can get from
measurements of these spectral distortions on the primordial power spectrum
from future experiments such as Pixie, and how these constraints change as we
change the frequency resolution and the sensitivity of the experiment. We show
that the additional information in the shape of the $i$-type distortions, in
combination with the \mu-type distortions, allows us to break the degeneracy
between the amplitude and the spectral index of the power spectrum on these
scales and leads to much tighter constraints. We quantify the information
contained in both the \mu-type distortions and the i-type distortions taking
into account the partial degeneracy with the y-type distortions and the
temperature of the blackbody part of the CMB. We also calculate the constraints
possible on the primordial power spectrum when the spectral distortion
information is combined with the CMB anisotropies measured by the WMAP, SPT,
ACT and Planck experiments.


title: Standard Model-like corrections to Dilatonic Dynamics

abstract:
  We examine the effects of standard model-like interactions on the
near-conformal dynamics of a theory featuring a dilatonic state identified with
the standard model-like Higgs. As template for near-conformal dynamics we use a
gauge theory with fermionic matter and elementary mesons possessing the same
non-abelian global symmetries as a technicolor-like theory with matter in a
complex representation of the gauge group. We then embed the electroweak gauge
group within the global flavor structure and add also ordinary quark-like
states to mimic the effects of the top. We find that the standard model-like
induced corrections modify the original phase diagram and the details of the
dilatonic spectrum. In particular, we show that the corrected theory exhibits
near-conformal behavior for a smaller range of flavors and colors. For this
range of values, however, our results suggest that near conformal dynamics
could accommodate the observed Higgs-like properties.


title:
Glasma Evolution and Bose-Einstein Condensation with Elastic and
  Inelastic Collisions

abstract:
  In this paper we investigate the role of inelastic collisions in the kinetic
evolution of a highly overpopulated gluon system starting from Glasma-type
initial condition. Using the Gunion-Bertsch formula we derive the inelastic
collision kernel under the collinear and small angle approximations. With both
numerics and analytic analysis, we show that the inelastic process has two
effects: globally changing (mostly reducing) the total particle number, while
locally at small momentum regime always filling up the infrared modes extremely
quickly. This latter effect is found to significantly speed up the emergence of
a local thermal distribution in the infrared regime with vanishing local
"chemical potential" and thus catalyze the onset of dynamical Bose-Einstein
Condensation to occur faster (as compared with the purely elastic case) in the
overpopulated Glasma.


title:
Constraints on the gluon PDF from top quark pair production at hadron
  colliders

abstract:
  Using the recently derived NNLO cross sections \cite{Czakon:2013goa}, we
provide NNLO+NNLL theoretical predictions for top quark pair production based
on all the available NNLO PDF sets, and compare them with the most precise LHC
and Tevatron data. In this comparison we study in detail the PDF uncertainty
and the scale, $m_t$ and $\alpha_s$ dependence of the theoretical predictions
for each PDF set. Next, we observe that top quark pair production provides a
powerful direct constraint on the gluon PDF at large $x$, and include Tevatron
and LHC top pair data consistently into a global NNLO PDF fit. We then explore
the phenomenological consequences of the reduced gluon PDF uncertainties, by
showing how they can improve predictions for Beyond the Standard Model
processes at the LHC. Finally, we update to full NNLO+NNLL the theoretical
predictions for the ratio of top quark cross sections between different LHC
center of mass energies, as well as the cross sections for hypothetical heavy
fourth-generation quark production at the LHC.


title: Relative Locality in Curved Space-time

abstract:
  In this paper we construct the action describing dynamics of the particle
moving in curved spacetime, with a non-trivial momentum space geometry. Curved
momentum space is the core feature of theories where relative locality effects
are presents. So far aspects of nonlinearities in momentum space have been
studied only for flat or constantly expanding (De Sitter) spacetimes, relying
on the their maximally symmetric nature. The extension of curved momentum space
frameworks to arbitrary spacetime geometries could be relevant for the
opportunities to test Planck-scale curvature/deformation of particles momentum
space. As a first example of this construction we describe the particle with
kappa-Poincar\'e momentum space on a circular orbit in Schwarzschild spacetime,
where the contributes of momentum space curvature turn out to be negligible.
The analysis of this problem relies crucially on the solution of the soccer
ball problem.


title: Efficient Construction of Spanners in $d$-Dimensions

abstract:
  In this paper we consider the problem of efficiently constructing $k$-vertex
fault-tolerant geometric $t$-spanners in $\dspace$ (for $k \ge 0$ and $t >1$).
Vertex fault-tolerant spanners were introduced by Levcopoulus et. al in 1998.
For $k=0$, we present an $O(n \log n)$ method using the algebraic computation
tree model to find a $t$-spanner with degree bound O(1) and weight
$O(\weight(MST))$. This resolves an open problem. For $k \ge 1$, we present an
efficient method that, given $n$ points in $\dspace$, constructs $k$-vertex
fault-tolerant $t$-spanners with the maximum degree bound O(k) and weight bound
$O(k^2 \weight(MST))$ in time $O(n \log n)$. Our method achieves the best
possible bounds on degree, total edge length, and the time complexity, and
solves the open problem of efficient construction of (fault-tolerant)
$t$-spanners in $\dspace$ in time $O(n \log n)$.


title: A PCA approach to stellar effective temperatures

abstract:
  The derivation of the effective temperature of a star is a critical first
step in a detailed spectroscopic analysis. Spectroscopic methods suffer from
systematic errors related to model simplifications. Photometric methods may be
more robust, but are exposed to the distortions caused by interstellar
reddening. Direct methods are difficult to apply, since fundamental data of
high accuracy are hard to obtain. We explore a new approach in which the
spectrum is used to characterize a star's effective temperature based on a
calibration established by a small set of standard stars. We perform principal
component analysis on homogeneous libraries of stellar spectra, then calibrate
a relationship between the principal components and the effective temperature
using a set of stars with reliable effective temperatures. We find that our
procedure gives excellent consistency when spectra from a homogeneous set of
observations are used. Systematic offsets may appear when combining
observations from different sources. Using as reference the spectra of stars
with high-quality spectroscopic temperatures in the Elodie library, we define a
temperature scale for FG-type disk dwarfs with an internal consistency of about
50 K, in excellent agreement with temperatures from direct determinations, but
distinct from widely used scales based on the infrared flux method.


title: A nonsingular spacetime defect

abstract:
  A nonsingular localized static classical solution is constructed for standard
Einstein gravity coupled to an $SO(3)\times SO(3)$ chiral model of scalars
(Skyrme model). This solution corresponds to a spacetime defect and its
construction proceeds in three steps. First, an \textit{Ansatz} is presented
for a solution with nonsimply connected topology of the spacetime manifold.
Second, an exact vacuum solution of the reduced field equations is obtained.
Third, matter fields are included and a particular exact solution of the
reduced field equations is found. The latter solution has a diverging total
energy, but its existence at least demonstrates that a nonsingular defect-type
solution having nonsimply connected topology is possible with nontrivial matter
fields.


title:
On Mobile DNA in Artificial Regulatory Networks: Evolving Functional and
  Structural Dynamism

abstract:
  There is a growing body of work considering the use of representations based
upon genetic regulatory networks. This paper uses a recently presented
abstract, tunable Boolean regulatory network model to explore aspects of mobile
DNA, such as transposons, within these dynamical systems. The significant role
of mobile DNA in the evolution of natural systems is becoming increasingly
clear. Whilst operators loosely based upon transposons have previously been
used within evolutionary computation, their use within regulatory network
representations enables the potential exploitation of numerous new mechanisms.
This paper shows how dynamically controlling network node connectivity and
function via transposon-inspired mechanisms can be selected for under
non-stationary and coevolutionary scenarios, including when such changes are
heritable.


title: The Entanglement Renyi Entropies of Disjoint Intervals in AdS/CFT

abstract:
  We study entanglement Renyi entropies (EREs) of 1+1 dimensional CFTs with
classical gravity duals. Using the replica trick the EREs can be related to a
partition function of n copies of the CFT glued together in a particular way
along the intervals. In the case of two intervals this procedure defines a
genus n-1 surface and our goal is to find smooth three dimensional
gravitational solutions with this surface living at the boundary. We find two
families of handlebody solutions labelled by the replica index n. These
particular bulk solutions are distinguished by the fact that they do not
spontaneously break the replica symmetries of the boundary surface. We show
that the regularized classical action of these solutions is given in terms of a
simple numerical prescription. If we assume that they give the dominant
contribution to the gravity partition function we can relate this classical
action to the EREs at leading order in G_N. We argue that the prescription can
be formulated for non-integer n. Upon taking the limit n -> 1 the classical
action reproduces the predictions of the Ryu-Takayanagi formula for the
entanglement entropy.


title: Multi-setting Greenberger-Horne-Zeilinger theorem

abstract:
  We present a generalized Greenberger-Horne-Zeilinger (GHZ) theorem, which
involves more than two local measurement settings for some parties, and cannot
be reduced to one with less settings. Our results hold for an odd number of
parties. We use a set of observables, which are incompatible but share a common
eigenstate, here a GHZ state. Such observables are called concurrent. The idea
is illustrated with an example of a three-qutrit system and then generalized to
systems of higher dimensions, and more parties. The GHZ paradoxes can lead to,
e.g., secret sharing protocols.


title:
Integral bases for the universal enveloping algebras of map
  superalgebras

abstract:
  Let $\mathfrak{g}$ be a finite dimensional complex simple classical Lie
superalgebra and $A$ be a commutative, associative algebra with unity over
$\mathbb{C}$. In this paper we define an integral form for the universal
enveloping algebra of the map superalgebra $\mathfrak{g}\otimes A$, and exhibit
an explicit integral basis for this integral form.


title: Cubic Topological Kondo Insulators

abstract:
  Current theories of Kondo insulators employ the interaction of conduction
electrons with localized Kramers doublets originating from a tetragonal
crystalline environment, yet all Kondo insulators are cubic. Here we develop a
theory of cubic topological Kondo insulators involving the interaction of spin
quartets with a conduction sea. The spin quartets greatly increase the
potential for strong topological insulators, entirely eliminating the
weak-topological phases from the diagram. We show that the relevant topological
behavior in cubic Kondo insulators can only reside at the lower symmetry X or M
points in the Brillouin zone, leading to a three Dirac cones with heavy
quasiparticles.