title: Radiative Penguin Decays at e^+ e^- Colliders

abstract:
  In this review, the most recent results of the radiative decays B -> X_s
gamma, B -> K^{(*)} l^+ l^-$ and B -> pi/eta l^+ l^- at e^+e^- colliders are
discussed. The new, most precise CP asymmetry measurements in B -> X_s gamma
from BABAR are presented together with branching fractions and photon energy
moments. For B -> K^{(*)} l^+ l^- modes, B factory results on partial branching
fractions, rate asymmetries and angular observables are combined with
measurements from CDF and the LHC experiments. The first branching fraction
upper limits for B -> eta l^+ l^- are shown along with updated upper limits of
B -> pi l^+ l^- branching fractions.


title:
Logic of Intuitionistic Interactive Proofs (Formal Theory of Perfect
  Knowledge Transfer)

abstract:
  We produce a decidable super-intuitionistic normal modal logic of
internalised intuitionistic (and thus disjunctive and monotonic) interactive
proofs (LIiP) from an existing classical counterpart of classical monotonic
non-disjunctive interactive proofs (LiP). Intuitionistic interactive proofs
effect a durable epistemic impact in the possibly adversarial communication
medium CM (which is imagined as a distinguished agent), and only in that, that
consists in the permanent induction of the perfect and thus disjunctive
knowledge of their proof goal by means of CM's knowledge of the proof: If CM
knew my proof then CM would persistently and also disjunctively know that my
proof goal is true. So intuitionistic interactive proofs effect a lasting
transfer of disjunctive propositional knowledge (disjunctively knowable facts)
in the communication medium of multi-agent distributed systems via the
transmission of certain individual knowledge (knowable intuitionistic proofs).
Our (necessarily) CM-centred notion of proof is also a disjunctive explicit
refinement of KD45-belief, and yields also such a refinement of standard
S5-knowledge. Monotonicity but not communality is a commonality of LiP, LIiP,
and their internalised notions of proof. As a side-effect, we offer a short
internalised proof of the Disjunction Property of Intuitionistic Logic
(originally proved by Goedel).


title:
Displacement based finite element formulations over polygons: a
  comparison between Laplace interpolants, strain smoothing and scaled boundary
  polygon formulation

abstract:
  Three different displacement based finite element formulations over arbitrary
polygons are studied in this paper. The formulations considered are: the
conventional polygonal finite element method (FEM) with Laplace interpolants,
the cell-based smoothed polygonal FEM with simple averaging technique and the
scaled boundary polygon formulation. For the purpose of numerical integration,
we employ the sub-traingulation for the polygonal FEM and classical Gaussian
quadrature for the smoothed FEM and for the scaled boundary polygon
formulation. The accuracy and the convergence properties of these formulations
are studied with a few benchmark problems in the context of linear elasticity
and the linear elastic fracture mechanics. The extension of scaled boundary
polygon to higher order polygons is also discussed.


title:
An asymptotic-preserving scheme for the semiconductor Boltzmann equation
  toward the energy-transport limit

abstract:
  We design an asymptotic-preserving scheme for the semiconductor Boltzmann
equation which leads to an energy-transport system for electron mass and
internal energy as mean free path goes to zero. To overcome the stiffness
induced by the convection terms, we adopt an even-odd decomposition to
formulate the equation into a diffusive relaxation system. New difficulty
arises in the two-scale stiff collision terms, whereas the simple BGK
penalization does not work well to drive the solution to the correct limit. We
propose a clever variant of it by introducing a threshold on the stiffer
collision term such that the evolution of the solution resembles a Hilbert
expansion at the continuous level. Formal asymptotic analysis and numerical
results are presented to illustrate the efficiency and accuracy of the new
scheme.


title:
Simulated random surfaces and effective string models in 3D Z(2) gauge
  theory

abstract:
  All-order strong coupling simulations have been used to derive precise
energies of string states in the confined phase of three dimensional Z(2)
lattice gauge theory. The behavior of the ground state energy is here compared
with predictions of effective string theory. Our new data reported here are
consistent with known universal terms of the long string length ($L_0$)
expansion known from effective string models in the continuum limit. Our
precision is however still not sufficient to disentangle non-univeral terms of
order $L_0^{-7}


title:
Indirect Measurement Process Parameterized by Nonunitary System -
  Pointer Interaction

abstract:
  An indirect quantum state measurement process is under investigation. Common
evolution of detector's microscopic part (pointer) and measured system (target)
is considered to be nonunitary due to the interaction between pointer and
environment. System of differential equations for superoperators, which map
initial target state to it's conditional final state is obtained. Developed
formalism is applied to the problem of cavity quantum mode photodetection to
investigate basic information characteristics of this measurement process.


title: The Stability Region of the Two-User Interference Channel

abstract:
  The stable throughput region of the two-user interference channel is
investigated here. First, the stability region for the general case is
characterized. Second, we study the cases where the receivers treat
interference as noise or perform successive interference cancelation. Finally,
we provide conditions for the convexity/concavity of the stability region and
for which a certain interference management strategy leads to broader stability
region.


title:
Proceedings of the 14th International Symposium on Database Programming
  Languages (DBPL 2013), August 30, 2013, Riva del Garda, Trento, Italy

abstract:
  This volume contains the papers presented at the 14th Symposium on Database
Programming Languages (DBPL 2013) held on August 30th, 2013, in Riva del Garda,
co-located with the 39th International Conference on Very Large Databases (VLDB
2013). They cover a wide range of topics including the application of
programming language techniques to further the expressiveness of database
languages, schema management, and the practical use of XPath. To complement
this technical program, DBPL 2013 featured three invited talks by Serge
Abiteboul (Inria), J\'er\^ome Sim\'eon (IBM), and Soren Lassen (Facebook).


title: Conditional formulae for Gibbs-type exchangeable random partitions

abstract:
  Gibbs-type random probability measures and the exchangeable random partitions
they induce represent an important framework both from a theoretical and
applied point of view. In the present paper, motivated by species sampling
problems, we investigate some properties concerning the conditional
distribution of the number of blocks with a certain frequency generated by
Gibbs-type random partitions. The general results are then specialized to three
noteworthy examples yielding completely explicit expressions of their
distributions, moments and asymptotic behaviors. Such expressions can be
interpreted as Bayesian nonparametric estimators of the rare species variety
and their performance is tested on some real genomic data.


title:
The european FAZIA initiative: a high-performance digital telescope
  array for heavy-ion studies

abstract:
  The european Fazia collaboration aims at building a new modular array for
charged product identification to be employed for heavy-ion studies. The
elementary module of the array is a Silicon-Silicon-CsI telescope, optimized
for ion identification also via pulse shape analysis. The achievement of top
performances imposes specific electronics which has been developed by FAZIA and
features high quality charge and current preamplifiers, coupled to fully
digital front-end. During the initial R&D phase, original and novel solutions
have been tested in prototypes, obtaining unprecedented ion identification
capabilities. FAZIA is now constructing a demonstrator array consisting of
about two hundreds telescopes arranged in a compact and transportable
configuration. In this contribution, we mainly summarize some aspects studied
by FAZIA to improve the ion identification. Then we will briefly discuss the
FAZIA program centered on experiments to be done with the demonstrator. First
results on the isospin dynamics obtained with a reduced set-up demonstrate well
the performance of the telescope and represent a good starting point towards
future investigations with both stable and exotic beams.


title: Discrete Morse Theory and a Reformulation of the K(\pi,1)-conjecture

abstract:
  A recent theorem of Dobrinskaya states that the K(\pi,1)-conjecture holds for
an Artin group G if and only if the canonical map from BM to BG is a homotopy
equivalence, where M denotes the Artin monoid associated to G. The aim of this
paper is to give an alternative proof by means of discrete Morse theory and
abstract homotopy theory. Moreover, we exhibit a new model for the classifying
space of an Artin monoid, in the spirit of Charney, Meier and Whittlesey, and a
small chain complex for computing its monoid homology, similar to the one of
Squier.


title: On the Stability Region of a Relay-Assisted Multiple Access Scheme

abstract:
  In this paper we study the impact of a relay node in a two-user network. We
assume a random access collision channel model with erasures. In particular we
obtain an inner and an outer bound for the stability region.


title: Study of Sublevel Population Mixing Effects in Hydrogen Neutral Beams

abstract:
  Intensities of hydrogen Balmer-series lines are sensitive to distribution of
populations of sublevels of excited state due to difference of radiative decay
branching ratio for sublevels with different orbital quantum number. Since
these sublevels are degenerate transitions between sublevels and mixing of its
population may be caused by very weak action of environment. A beam of fast
hydrogen atoms is a system in which these fine effects of population mixing can
be observed. Experimental data of H-alpha line radiation intensities in
hydrogen neutral beams are compared with calculations assumed different models
of sublevel population. The comparison most probably point out that population
mixing effects cause transitions from long-lived 3s to 3p sublevel with
corresponding changes in H-alpha radiation intensities. Discussed effects may
influence to results of Doppler-shift spectroscopy measurements of the neutral
beam parameters such as species and impurities content and neutralizing
efficiency.


title: Unusual nature of fully-gapped superconductivity in In-doped SnTe

abstract:
  The superconductor Sn_{1-x}In_{x}Te is a doped topological crystalline
insulator and has become important as a candidate topological superconductor,
but its superconducting phase diagram is poorly understood. By measuring about
50 samples of high-quality, vapor-grown single crystals, we found that the
dependence of the superconducting transition temperature Tc on the In content x
presents a qualitative change across the critical doping xc ~ 3.8%, at which a
structural phase transition takes place. Intriguingly, in the ferroelectric
rhombohedral phase below the critical doping, Tc is found to be strongly
ENHANCED with impurity scattering. It appears that the nature of electron
pairing changes across xc in Sn_{1-x}In_{x}Te.


title: Divergence Theorems and the Supersphere

abstract:
  The transformation formula of the Berezin integral holds, in the non-compact
case, only up to boundary integrals, which have recently been quantified by
Alldridge-Hilgert-Palzer. We establish divergence theorems in semi-Riemannian
supergeometry by means of the flow of vector fields and these boundary
integrals, and show how superharmonic functions are related to conserved
quantities. An integration over the supersphere was introduced by Coulembier-De
Bie-Sommen as a generalisation of the Pizzetti integral. In this context, a
mean value theorem for harmonic superfunctions was established. We formulate
this integration along the lines of the general theory and give a superior
proof of two mean value theorems based on our divergence theorem.


title:
Anomalous Hall Response in Two Dimensional Topological Insulators due to
  the Stark Effect

abstract:
  It is shown that the presence of matrix dipole moments induced by external
electric fields can modify the Hall response in two dimensional Topological
insulators. In the case of the Quantum Anomalous Hall effect the induced
transverse currents acquire an extra term being proportional to the Hall
conductance and the time derivative of the applied electric field. In the case
of the Quantum Spin Hall effect both a spin and charge transverse currents
appear simultaneously. In virtue of the bulk-edge correspondence the coupling
between the chiral edge channels and the electromagnetic field changes allowing
for an extra non minimal coupling term. Both effects can be measured through
transport and tunnelling experiments.


title:
Finslerian MOND versus the Strong Gravitational Lensing of the
  Early-type Galaxies

abstract:
  The gravitational lensing of Bullet Clusters and early-type galaxies pose
serious challenges on the validity of MOND. Recently, Finslerian MOND, a
generalization of MOND in the framework of Finsler gravity, has been proposed
to explain the mass discrepancy problem of Bullet Cluster 1E 0657\ 558. In this
paper, we check the validity of the Finslerian MOND in describing the strong
gravitational lensing of early-type galaxies. The investigation on ten strong
lenses of the CASTLES samples shows that there is no strong evidence for the
existence of dark matter.


title:
Simultaneous Analysis of Recurrent Jovian Electron Increases and
  Galactic Cosmic Ray Decreases

abstract:
  The transport environment for particles in the heliosphere, e.g. galactic
cosmic rays (GCRs) and MeV electrons (including those originating from Jupiters
magnetosphere), is defined by the solar wind flow and the structure of the
embedded heliospheric magnetic field. Solar wind structures, such as
co-rotating interaction regions (CIR), can result in periodically modulation of
both particles species. A detailed analysis of this recurrent Jovian electron
events and galactic cosmic ray decreases measured by SOHO EPHIN is presented
here, showing clearly a change of phase between both phenomena during the cause
of the years 2007 and 2008. This effect can be explained by the change of
difference in heliolongitude between the Earth and Jupiter, which is of central
importance for the propagation of Jovian electrons. Furthermore, the data can
be ordered such that the 27-day Jovian electron variation vanishes in the
sector which does not connect the Earth with Jupiter magnetically using
observed solar wind speeds.


title:
SWAP Observations of the Long-Term, Large-Scale Evolution of the EUV
  Solar Corona

abstract:
  The Sun Watcher with Active Pixels and Image Processing (SWAP) EUV solar
telescope on board the Project for On-Board Autonomy 2 (PROBA2) spacecraft has
been regularly observing the solar corona in a bandpass near 17.4 nm since
February 2010. With a field-of-view of 54x54 arcmin, SWAP provides the
widest-field images of the EUV corona available from the perspective of the
Earth. By carefully processing and combining multiple SWAP images it is
possible to produce low-noise composites that reveal the structure of the EUV
corona to relatively large heights. A particularly important step in this
processing was to remove instrumental stray light from the images by
determining and deconvolving SWAP's point spread function (PSF) from the
observations. In this paper we use the resulting images to conduct the first
ever study of the evolution of the large-scale structure of the corona observed
in the EUV over a three-year period that includes the complete rise phase of
solar cycle 24. Of particular note is the persistence over many solar rotations
of bright, diffuse features composed of open magnetic field that overlie polar
crown filaments and extend to large heights above the solar surface. These
features appear to be related to coronal fans, which have previously been
observed in white-light coronagraph images and, at low heights, in the EUV. We
also discuss the evolution of the corona at different heights above the solar
surface and the evolution of the corona over the course of the solar cycle by
hemisphere.


title:
Classification of simple weight modules with finite-dimensional weight
  spaces over the Schr\"odinger algebra

abstract:
  We classify simple weight modules with finite-dimensional weight spaces over
the (centrally extended complex) Schr\"odinger algebra in (1+1)-dimensional
space-time. Our arguments use the description of lowest weight modules by
Dobrev, Doebner and Mrugalla; Mathieu's twisting functors and results of Wu and
Zhu on dimensions of weight spaces in dense modules.


title: A proof for Padberg's conjecture on rank of matching polytope

abstract:
  Padberg introduced a geometric notion of ranks for (mixed) integer rational
polyhedrons and conjectured that the geometric rank of the matching polytope is
one. In this work, we prove that this conjecture is true.


title: Gaussian measures on the of space of Riemannian metrics

abstract:
  We introduce Gaussian-type measures on the manifold of all metrics with a
fixed volume form on a compact Riemannian manifold of dimension $\geq 3$. For
this random model we compute the characteristic function for the $L^2$ (Ebin)
distance to the reference metric. In the Appendix, we study Lipschitz-type
distance between Riemannian metrics and give applications to the diameter,
eigenvalue and volume entropy functionals.


title: Ergodic Randomized Algorithms and Dynamics over Networks

abstract:
  Algorithms and dynamics over networks often involve randomization, and
randomization may result in oscillating dynamics which fail to converge in a
deterministic sense. In this paper, we observe this undesired feature in three
applications, in which the dynamics is the randomized asynchronous counterpart
of a well-behaved synchronous one. These three applications are network
localization, PageRank computation, and opinion dynamics. Motivated by their
formal similarity, we show the following general fact, under the assumptions of
independence across time and linearities of the updates: if the expected
dynamics is stable and converges to the same limit of the original synchronous
dynamics, then the oscillations are ergodic and the desired limit can be
locally recovered via time-averaging.


title: A viable explanation of the CMB dipolar statistical anisotropy

abstract:
  The presence of a dipolar statistical anisotropy in the spectrum of cosmic
microwave background (CMB) fluctuations was reported by the Wilkinson Microwave
Anisotropy Probe (WMAP), and has recently been confirmed in the Planck 2013
analysis of the temperature anisotropies. At the same time, the Planck 2013
results report a stringent bound on the amplitude of the local-type
non-Gaussianity. We show that the non-linear effect of the dipolar anisotropy
generates not only a quadrupole moment in the CMB but also a local-type
non-Gaussianity. Consequently, it is not easy to build models having a large
dipolar modulation and at the same time a sufficiently small quadrupole and
level of local bispectral anisotropy to agree with the present data. In
particular, most models proposed so far are almost excluded, or are at best
marginally consistent with observational data. We present a simple alternative
scenario that may explain the dipolar statistical anisotropy while satisfying
the observational bounds on both the quadrupole moment and local-type
non-Gaussianity.


title:
The Thermal Aspects of Relativistic Quantum Field Theory as an
  Observational Window in a Deeper Layer of Quantum Space-Time or: Dirac's
  Revenge

abstract:
  In this paper we shall derive the thermal properties of the relativistic
quantum vacuum from a more primordial underlying structure which shares some
properties with the old Dirac-sea picture. We show in particular how the
Tomita-KMS structure in RQFT is a consequence of the structure and dynamics of
the underlying pattern of vacuum fluctuations. We explain the origin of the
doubling phenomenon in thermofield theory and the duality symmetry between a
local algebra of fields or observables and its commutant in RQFT and give an
interpretation of the notion of thermal time.


title:
Between Being and Becoming: a meta-theoretical approach to
  irreversibility

abstract:
  The relationship between reversible-dynamical and irreversible-thermodynamic
descriptions is analyzed from a meta-theoretical point of view. A network of
inter-theoretical relations is drawn by means of asymptotic relations and
complementarity. It is argued that the "paradox" between micro-reversibility
and macro-irreversibility can be overcome by assuming a meta-complementarity
relation existing between different levels of physical description, preserving
a realist conception.


title:
A twisted Bass-Heller-Swan decomposition for the algebraic K-theory of
  additive categories

abstract:
  We prove a twisted Bass-Heller-Swan decomposition for both the connective and
the non-connective K-theory spectrum of additive categories.


title:
On the rescaled Riemannian metric of Cheeger Gromoll type on the
  cotangent bundle

abstract:
  Let $(M,g)$ be an n-dimensional Riemannian manifold and $T^{*}M$ be its
cotangent bundle equipped with a Riemannian metric of Cheeger Gromoll type
which rescale the horizontal part by a nonzero differentiable function. The
main purpose of the present paper is to discuss curvature properties of
$T^{*}M$ and construct almost paracomplex Norden structures on $T^{*}M$. We
investigate conditions for these structures to be para-K\"ahler
(paraholomorphic) and quasi-K\"ahler. Also, some properties of almost
paracomplex Norden structures in context of almost product Riemannian manifolds
are presented.


title: Dynamics of polymer ejection from capsid

abstract:
  Polymer ejection from a capsid through a nanoscale pore is an important
biological process with relevance to modern biotechnology. Here, we study
generic capsid ejection using Langevin dynamics. We show that even when the
ejection takes place within the drift-dominated region there is a very high
probability for the ejection process not to be completed. Introducing a small
aligning force at the pore entrance enhances ejection dramatically. Such a pore
asymmetry is a candidate for a mechanism by which a viral ejection is
completed. By detailed high-resolution simulations we show that such capsid
ejection is an out-of-equilibrium process that shares many common features with
the much studied driven polymer translocation through a pore in a wall or a
membrane. We find that the escape times scale with polymer length, $\tau \sim
N^\alpha$. We show that for the pore without the asymmetry the previous
predictions corroborated by Monte Carlo simulations do not hold. For the pore
with the asymmetry the scaling exponent varies with the initial monomer density
(monomers per capsid volume) $\rho$ inside the capsid. For very low densities
$\rho \le 0.002$ the polymer is only weakly confined by the capsid, and we
measure $\alpha = 1.33$, which is close to $\alpha = 1.4$ obtained for polymer
translocation. At intermediate densities the scaling exponents $\alpha = 1.25$
and $1.21$ for $\rho = 0.01$ and $0.02$, respectively. These scalings are in
accord with a crude derivation for the lower limit $\alpha = 1.2$. For the
asymmetrical pore precise scaling breaks down, when the density exceeds the
value for complete confinement by the capsid, $\rho \gtrapprox 0.25$. The
high-resolution data show that the capsid ejection for both pores, analogously
to polymer translocation, can be characterized as a multiplicative stochastic
process that is dominated by small-scale transitions.


title: Current-induced torques and interfacial spin-orbit coupling

abstract:
  In bilayer systems consisting of an ultrathin ferromagnetic layer adjacent to
a metal with strong spin-orbit coupling, an applied in-plane current induces
torques on the magnetization. The torques that arise from spin-orbit coupling
are of particular interest. Here, we calculate the current-induced torque in a
Pt-Co bilayer to help determine the underlying mechanism using first principles
methods. We focus exclusively on the analogue to the Rashba torque, and do not
consider the spin Hall effect. The details of the torque depend strongly on the
layer thicknesses and the interface structure, providing an explanation for the
wide variation in results found by different groups. The torque depends on the
magnetization direction in a way similar to that found for a simple Rashba
model. Artificially turning off the exchange spin splitting and separately the
spin-orbit coupling potential in the Pt shows that the primary source of the
"field-like" torque is a proximate spin-orbit effect on the Co layer induced by
the strong spin-orbit coupling in the Pt.


title:
Planck intermediate results. XV. A study of anomalous microwave emission
  in Galactic clouds

abstract:
  Anomalous microwave emission (AME) is believed to be due to electric dipole
radiation from small spinning dust grains. The aim of this paper is a
statistical study of the basic properties of AME regions and the environment in
which they emit. We used WMAP and Planck maps, combined with ancillary radio
and IR data, to construct a sample of 98 candidate AME sources, assembling SEDs
for each source using aperture photometry on 1deg-smoothed maps from 0.408 GHz
up to 3000 GHz. Each spectrum is fitted with a simple model of free-free,
synchrotron (where necessary), cosmic microwave background (CMB), thermal dust,
and spinning dust components. We find that 42 of the 98 sources have
significant (>5sigma) excess emission at frequencies between 20 and 60 GHz. An
analysis of the potential contribution of optically thick free-free emission
from ultra-compact HII regions, using IR colour criteria, reduces the
significant AME sample to 27 regions. The spectrum of the AME is consistent
with model spectra of spinning dust. The AME regions tend to be more spatially
extended than regions with little or no AME. The AME intensity is strongly
correlated with the submillimetre/IR flux densities and comparable to previous
AME detections in the literature. AME emissivity, defined as the ratio of AME
to dust optical depth, varies by an order of magnitude for the AME regions. The
AME regions tend to be associated with cooler dust in the range 14-20 K and an
average emissivity index of +1.8, while the non-AME regions are typically
warmer, at 20-27 K. In agreement with previous studies, the AME emissivity
appears to decrease with increasing column density. The emerging picture is
that the bulk of the AME is coming from the polycyclic aromatic hydrocarbons
and small dust grains from the colder neutral interstellar medium phase
(Abridged).


title: Non-abelian T-duality, generalised geometry and holography

abstract:
  Recent progress which relates non-abelian T-duality of $\mathcal{N}=1$ SuGra
solutions to the powerful techniques of Generalised geometry is reviewed. It is
shown that SU(3) structure solutions are mapped to SU(2) structures and the
transformation rule of the corresponding pure spinors is presented. This
constitutes an important step on the road towards the utility of the duality
within holography, showing for example, how smeared sources must transform and
so how to add flavour to the T-duals.


title:
Quasiparticle spectra and excitons of organic molecules deposited on
  substrates: G0W0-BSE approach applied to benzene on graphene and metallic
  substrates

abstract:
  We present an alternative methodology for calculating the quasi-particle
energy, energy loss, and optical spectra of a molecule deposited on graphene or
a metallic substrate. To test the accuracy of the method it is first applied to
the isolated benzene (C6H6) molecule. The quasiparticle energy levels and
especially the energies of the benzene excitons (triplet, singlet, optically
active and inactive) are in very good agreement with available experimental
results. It is shown that the vicinity of the various substrates
(pristine/doped graphene or (jellium) metal surface) reduces the quasiparticle
HOMO-LUMO gap by an amount that slightly depends on the substrate type. This is
consistent with the simple image theory predictions. It is even shown that the
substrate does not change the energy of the excitons in the isolated molecule.
We prove (in terms of simple image theory) that energies of the excitons are
indeed influenced by two mechanisms which cancel each other. We demonstrate
that the benzene singlet optically active (E1u) exciton couples to real
electronic excitations in the substrate. This causes it substantial decay, such
as {\Gamma} = 174 meV for pristine graphene and {\Gamma} = 362 meV for metal
surfaces as the substrate. However, we find that doping graphene does not
influence the E1u exciton decay rate.


title: Circum-stellar medium around rotating massive stars at solar metallicity

abstract:
  Aims. Observations show nebulae around some massive stars but not around
others. If observed, their chemical composition is far from homogeneous. Our
goal is to put these observational features into the context of the evolution
of massive stars and their circumstellar medium (CSM) and, more generally, to
quantify the role of massive stars for the chemical and dynamical evolution of
the ISM. Methods. Using the A-MAZE code, we perform 2d-axisymmetric
hydrodynamical simulations of the evolution of the CSM, shaped by stellar
winds, for a whole grid of massive stellar models from 15 to 120 Msun and
following the stellar evolution from the zero-age main-sequence to the time of
supernova explosion. In addition to the usual quantities, we also follow five
chemical species: H, He, C, N, and O. Results. We show how various quantities
evolve as a function of time: size of the bubble, position of the wind
termination shock, chemical composition of the bubble, etc. The chemical
composition of the bubble changes considerably compared to the initial
composition, particularly during the red-supergiant (RSG) and Wolf-Rayet (WR)
phases. In some extreme cases, the inner region of the bubble can be completely
depleted in hydrogen and nitrogen, and is mainly composed of carbon, helium and
oxygen. We argue why the bubble typically expands at a lower rate than
predicted by self-similarity theory. In particular, the size of the bubble is
very sensitive to the density of the ISM, decreasing by a factor of around 2.5
for each additional dex in ISM density. The bubble size also decreases with the
metallicity of the central star, as low-metallicity stars have weaker winds.
Our models qualitatively fit the observations of WR ejecta nebulae.


title: The degrees of maps between $(2n-1)$-Poincar\' e complexes

abstract:
  In this paper, using exclusively homotopy theoretical methods, we study
degrees of maps between $(n-2)$-connected $(2n-1)$-dimensional Poincar\' e
complexes which have torsion free integral homology. Necessary and sufficient
algebraic conditions for the existence of map degrees between such Poincar\' e
complexes are established.
  We calculate the set of all map degrees between certain two $(n-2)$-connected
$(2n-1)$-dimensional torsion free Poincar\'e complexes.
  For low $n$, using knowledge of possible degrees of self maps, we classify,
up to homotopy, torsion free $(n-2)$-connected $(2n-1)$-dimensional Poincar\' e
complexes.


title: Cores of Symplectic Double Groupoids via Reduction

abstract:
  We use symplectic reduction to give a new construction of the core $C$ of a
symplectic double groupoid $D$ as the common leaf space of characteristic
foliations associated to various coisotropic submanifolds of $D$. In the case
of the cotangent double groupoid of a Lie groupoid $G$, the canonical relations
arising from this process turn out to be cotangent lifts of structure maps
associated to $G$. We also show that under this reduction procedure the double
groupoid structure on $D$ descends to a groupoid structure on the leaf space
above, recovering the core groupoid structure on $C$ of Brown and Mackenzie.


title: Thermostatistics of \mu-deformed analog of Bose gas model

abstract:
  For the recently introduced \mu-deformed analog of Bose gas model (\mu-Bose
gas model) we study some thermodynamical aspects. Namely, we calculate total
number of particles and, from it, the deformed partition function, both
involving dependence on the deformation parameter \mu. Such dependence of
thermodynamic functions on the \mu-parameter is at the core of modification of
Bose gas model and arises through the use of new techniques given by us, the
\mu-calculus, an alternative to the well-known q-calculus (Jackson derivative
and integral). Necessary elements of \mu-calculus are first presented. Then,
for high temperatures we obtain virial expansion of the equation of state and
find five first virial coefficients, as functions of \mu. At the other end, for
low temperatures the critical temperature of condensation T_c^(\mu) depending
on \mu is found and compared with the usual T_c, and with the T_c^(p,q) of
earlier studied p,q-Bose gas model. The internal energy, specific heat and the
entropy of \mu-Bose gas are also given, both for high and low temperatures.
Features peculiar for the \mu-Bose gas model are emphasized.

categories: cond-mat.stat-mech cond-mat.quant-gas hep-th quant-ph


title: The left (right) triangulated structures of the stable categories

abstract:
  Beligiannis and Marmaridis [\emph{Comm. in Algebra,} 22(12)(1994), 5021-5036]
constructed the left and right triangulated structures on the stable categories
of additive categories induced from some homological finite subcategories. We
extend their results to slightly more general settings. As an application of
our results we give some new examples of stable categories which have left or
right triangulated structures from abelian model categories. An interesting
outcome is that we can describe the pretriangulated structures of the homotopy
categories of abelian model categories via the ones of stable categories.


title: Mixed Polling with Rerouting and Applications

abstract:
  Queueing systems with a single server in which customers wait to be served at
a finite number of distinct locations (buffers/queues) are called discrete
polling systems. Polling systems in which arrivals of users occur anywhere in a
continuum are called continuous polling systems. Often one encounters a
combination of the two systems: the users can either arrive in a continuum or
wait in a finite set (i.e. wait at a finite number of queues). We call these
systems mixed polling systems. Also, in some applications, customers are
rerouted to a new location (for another service) after their service is
completed. In this work, we study mixed polling systems with rerouting. We
obtain their steady state performance by discretization using the known pseudo
conservation laws of discrete polling systems. Their stationary expected
workload is obtained as a limit of the stationary expected workload of a
discrete system. The main tools for our analysis are: a) the fixed point
analysis of infinite dimensional operators and; b) the convergence of Riemann
sums to an integral.
  We analyze two applications using our results on mixed polling systems and
discuss the optimal system design. We consider a local area network, in which a
moving ferry facilitates communication (data transfer) using a wireless link.
We also consider a distributed waste collection system and derive the optimal
collection point. In both examples, the service requests can arrive anywhere in
a subset of the two dimensional plane. Namely, some users arrive in a
continuous set while others wait for their service in a finite set. The only
polling systems that can model these applications are mixed systems with
rerouting as introduced in this manuscript.


title:
Besov-Type and Triebel--Lizorkin-Type Spaces Associated with Heat
  Kernels

abstract:
  Let $(M, \rho,\mu)$ be an RD-space satisfying the non-collapsing condition.
In this paper, the authors introduce Besov-type spaces $B_{p,q}^{s,\tau}(M)$
and Triebel--Lizorkin-type spaces $F_{p,q}^{s,\tau}(M)$ associated to a
non-negative self-adjoint operator $L$ whose heat kernels satisfy some Gaussian
upper bound estimate, H\"older continuity, and the stochastic completeness
property. Characterizations of these spaces via Peetre maximal functions and
heat kernels are established for full range of indices. Also, frame
characterizations of these spaces are given. When $L$ is the Laplacian operator
on $\mathbb R^n$, these spaces coincide with the Besov-type and
Triebel-Lizorkin-type spaces on $\mathbb R^n$ studied in [Lecture Notes in
Mathematics 2005, Springer-Verlag, Berlin, 2010]. In the case $\tau=0$ and the
smoothness index $s$ is around zero, comparisons of these spaces with the Besov
and Triebel--Lizorkin spaces studied in [Abstr. Appl. Anal. 2008, Art. ID
893409, 250 pp] are also presented.


title:
Asymmetric Energy Transfer Between Coupled Magnetic Vortices by
  Asymmetric Gyration Amplification

abstract:
  We present a numerical exploration of the possibility of sustained
amplification of magnetic vortex gyration by controlling the relative
polarities of a coupled vortices in short vortex chains. First, we numerically
establish the asymmetry in gyration of a single vortex based on its polarity by
use of external magnetic field rotating at the gyrotropic frequency. This
phenomena can be used to design logical adapters if vortex core switching is
avoided. The criteria to obtain a good gyration amplitude ratio to easily
observe true or false output has been examined further. The cases of coupled
magnetic vortices and short vortex chains have been studied with different
polarity configurations to reveal other desirable aspects of vortex dynamics
including, but not limited to, highly efficient signal transfer. These findings
are important in applications for information signal processing.


title: On Zariski's Cancellation Problem in positive characteristic

abstract:
  In this paper we shall show that when k is a field of positive characteristic
the affine space A^n_k is not cancellative for any n greater than 2.


title: Semistochastic Quadratic Bound Methods

abstract:
  Partition functions arise in a variety of settings, including conditional
random fields, logistic regression, and latent gaussian models. In this paper,
we consider semistochastic quadratic bound (SQB) methods for maximum likelihood
inference based on partition function optimization. Batch methods based on the
quadratic bound were recently proposed for this class of problems, and
performed favorably in comparison to state-of-the-art techniques.
Semistochastic methods fall in between batch algorithms, which use all the
data, and stochastic gradient type methods, which use small random selections
at each iteration. We build semistochastic quadratic bound-based methods, and
prove both global convergence (to a stationary point) under very weak
assumptions, and linear convergence rate under stronger assumptions on the
objective. To make the proposed methods faster and more stable, we consider
inexact subproblem minimization and batch-size selection schemes. The efficacy
of SQB methods is demonstrated via comparison with several state-of-the-art
techniques on commonly used datasets.


title: GEM Module Design for the ILD TPC

abstract:
  A Time Projection Chamber (TPC) using micro-pattern gas detectors is planned
as the main tracking device for a detector at the next Linear Collider. A novel
support structure for Gas Electron Multipliers (GEMs), which minimizes the
material and improves the flatness of the foils, has been developed and tested
with multiple GEM modules in a large TPC prototype at DESY. Reducing dead
material at the GEM module boundaries improves the field homogeneity. In
addition, it was shown in simulation that a field shaping ring at the border of
the module can improve the charge collection in regions with non-homogeneous
fields. This shaping wire was integrated into the module design and a
successful test beam campaign with three modules has been carried out. First
results regarding resolution and field distortions will be discussed.


title:
Revealing the cold dust in low-metallicity environments: I - Photometry
  analysis of the Dwarf Galaxy Survey with Herschel

abstract:
  We present new photometric data from our Herschel Key Programme, the Dwarf
Galaxy Survey (DGS), dedicated to the observation of the gas and dust in 48
low-metallicity environments. They were observed with PACS and SPIRE onboard
Herschel at 70,100,160,250,350, and 500 microns. We focus on a systematic
comparison of the derived FIR properties (FIR luminosity, dust mass, dust
temperature and emissivity index) with more metal-rich galaxies and investigate
the detection of a potential submm excess. The data reduction method is adapted
for each galaxy to derive the most reliable photometry from the final maps.
PACS flux densities are compared with the MIPS 70 and 160 microns bands. We use
colour-colour diagrams and modified blackbody fitting procedures to determine
the dust properties of the DGS galaxies. We also include galaxies from the
Herschel KINGFISH sample, containing more metal-rich environments, totalling
109 galaxies. The location of the DGS galaxies on Herschel colour-colour
diagrams highlights the differences in global environments of low-metallicity
galaxies. The dust in DGS galaxies is generally warmer than in KINGFISH
galaxies (T_DGS~32 K, T_KINGFISH~23 K). The emissivity index, beta, is ~1.7 in
the DGS, but metallicity does not make a strong effect on beta. The
dust-to-stellar mass ratio is lower in low-metallicity galaxies:
M_dust/M_star~0.02% for the DGS vs 0.1% for KINGFISH. Per unit dust mass, dwarf
galaxies emit ~6 times more in the FIR than higher metallicity galaxies. Out of
the 22 DGS galaxies detected at 500 micron, 41% present an excess in the submm
not explained by our dust SED model. The excess mainly appears in lower
metallicity galaxies (12+log(O/H) < 8.3), and the strongest excesses are
detected in the most metal-poor galaxies. We stress the need for observations
longwards of the Herschel wavelengths to detect any submm excess appearing
beyond 500 micron.


title: Complexity reduction in many particles systems with random initial data

abstract:
  We consider the motion of interacting particles governed by a coupled system
of ODEs with random initial conditions. Direct computations for such systems
are prohibitively expensive due to a very large number of particles and
randomness requiring many realizations in their locations in the presence of
strong interactions. While there are several approaches that address the above
difficulties, none addresses all three simultaneously. Our goal is to develop
such a computational approach in order to capture the experimentally observed
emergence of correlations in the collective state (patterns due to strong
interactions). Our approach is based on the truncation of the BBGKY hierarchy
that allows one to go beyond the classical Mean Field limit and capture
correlations while drastically reducing the computational complexity. Finally,
we provide an example showing a numerical solution of this nonlinear and
non-local system.


title:
Quantum Calculations Show Caution Is Needed In Interpreting
  Methanethiosulfonate Accessibility Experiments On Ion Channels

abstract:
  Standard models of ion channel voltage gating require substantial movement of
one transmembrane segment, S4, of the voltage sensing domain. Evidence comes
from the accessibility to external methanethiosulfonate (MTS) reagents of the
positively charged arginine residues (R) on this segment. These are first
mutated to cysteines (C), which in turn react with MTS reagents; it is assumed
that the C is passively carried in the S4 movement, becoming accessible on one
side or the other of the membrane. However, the Rs were salt bridged to
negatively charged residues on other transmembrane segments, or hydrogen
bonded, while C reacts as a negative ion. The space available for MTS is fairly
close to the difference in volume between the large R residue and much smaller
C, so the MTS is not severely sterically hindered. A reagent molecule can reach
a C side chain; the C can react if not repelled by a negative charge from the
amino acid to which the R had been salt bridged. Nearby protons may also make
reaction possible unless the C itself is protonated. Therefore interpretation
of the C substitution results requires reconsideration. To test the idea we
have done quantum calculations on part of a mutated S4 and the nearby section
of the channel. The mutation is R300C of the 2A79/3Lut structure, a mutation
that would be done to test MTS reagent access; there is a large cavity where
the R is replaced by C. Two quantum calculations show a substantial difference
in the structure of this cavity with 2 water molecules compared to 4. This
suggests that the structure, and presumably reaction probability, could depend
on water molecules, very likely also protons, in or near the cavity that the
R300C mutation produces.


title:
Electronic Structure of the Metallic Antiferromagnet PdCrO$_2$ Measured
  by Angle-Resolved Photoemission Spectroscopy

abstract:
  PdCrO$_2$ is material which has attracted interest due to the coexistence of
metallic conductivity associated with itinerant Pd 4d electrons and
antiferromagnetic order arising from localized Cr spins. A central issue is
determining to what extent the magnetic order couples to the conduction
electrons. Here we perform angle-resolved photoemission spectroscopy (ARPES) to
experimentally characterize the electronic structure. We find that the Fermi
surface has contributions from both bulk and surface states, which can be
experimentally distinguished and theoretically verified by slab band structure
calculations. The bulk Fermi surface shows no signature of electronic
reconstruction in the antiferromagnetic state. This observation suggests that
there is negligible interaction between the localized Cr spin structure and the
itinerant Pd electrons measured by ARPES.


title: Quantum Digital Signatures without quantum memory

abstract:
  Quantum Digital Signatures (QDS) allow for the exchange of messages from one
sender to multiple recipients, with the guarantee that messages cannot be
forged or tampered with. Additionally, messages cannot be repudiated -- if one
recipient accepts a message, she is guaranteed that others will accept the same
message as well. While messaging with these types of security guarantees are
routinely performed in the modern digital world, current technologies only
offer security under computational assumptions. QDS, on the other hand, offer
security guaranteed by quantum mechanics. All thus far proposed variants of QDS
require long-term, high quality storage of quantum information, making them
unfeasible in the foreseeable future. Here, we present the first QDS scheme
where no quantum memory is required, and all quantum information processing can
be performed using just linear optics. This makes QDS feasible with current
technology.


title: Effect of spin rotation coupling on spin transport

abstract:
  We have studied the spin rotation coupling(SRC) as an ingredient to explain
different spin related issues. This special kind of coupling can play the role
of a Dresselhaus like coupling in certain conditions. Consequently, one can
control the spin splitting, induced by the Dresselhaus like term, which is
unusual in semiconductor heterostucture. Within this framework, we also study
the renormalization of the spin dependent electric field and spin current due
to the $\vec{k} . \vec{p}$ perturbation, by taking into account the interband
mixing in the rotating system. In this paper we predict the enhancement of the
spin dependent electric field resulting from the renormalized spin rotation
coupling. The renormalization factor of the spin electric field is different
from that of the SRC or Zeeman coupling. The effect of renormalized SRC on spin
current and Berry curvature is also studied. Interestingly, in presence of this
SRC induced SOC it is possible to describe spin splitting as well as spin
galvanic effect in semiconductors.


title:
On unbounded, non-trivial Hochschild cohomology in finite von Neumann
  algebras and higher order Berezin's quantization

abstract:
  We introduce a class of densely defined, unbounded, 2-Hochschild cocycles
([PT]) on finite von Neumann algebras $M$. Our cocycles admit a coboundary,
determined by an unbounded operator on the standard Hilbert space associated to
the von Neumann algebra $M$. For the cocycles associated to the
$\Gamma$-equivariant deformation ([Ra]) of the upper halfplane
$(\Gamma=PSL_2(\mathbb Z))$, the "imaginary" part of the coboundary operator is
a cohomological obstruction - in the sense that it can not be removed by a
"large class" of closable derivations, with non-trivial real part, that have a
joint core domain, with the given coboundary.


title: Surface differential rotation of IL Hya from time-series Doppler images

abstract:
  We present a time-series Doppler imaging study of the K-subgiant component in
the RS CVn-type binary system IL Hya (P orb=12.905 d). From re-processing the
unique long-term spectroscopic dataset of 70 days taken in 1996/97, we perform
a thorough cross-correlation analysis to derive surface differential rotation.
As a result we get solar-type differential rotation with a shear value alpha of
0.05, in agreement with preliminary suggestions from previous attempts. A
possible surface pattern of meridional circulation is also detected.


title:
Experimental Three-Particle Quantum Nonlocality under Strict Locality
  Conditions

abstract:
  Quantum correlations are critical to our understanding of nature, with
far-reaching technological and fundamental impact. These often manifest as
violations of Bell's inequalities, bounds derived from the assumptions of
locality and realism, concepts integral to classical physics. Many tests of
Bell's inequalities have studied pairs of correlated particles; however, the
immense interest in multi-particle quantum correlations is driving the
experimental frontier to test systems beyond just pairs. All experimental
violations of Bell's inequalities to date require supplementary assumptions,
opening the results to one or more loopholes, the closing of which is one of
the most important challenges in quantum science. Individual loopholes have
been closed in experiments with pairs of particles and a very recent result
closed the detection loophole in a six ion experiment. No experiment thus far
has closed the locality loopholes with three or more particles. Here, we
distribute three-photon Greenberger-Horne-Zeilinger entangled states using
optical fibre and free-space links to independent measurement stations. The
measured correlations constitute a test of Mermin's inequality while closing
both the locality and related freedom-of-choice loopholes due to our
experimental configuration and timing. We measured a Mermin parameter of 2.77
+/- 0.08, violating the inequality bound of 2 by over 9 standard deviations,
with minimum tolerances for the locality and freedom-of-choice loopholes of 264
+/- 28 ns and 304 +/- 25 ns, respectively. These results represent a
significant advance towards definitive tests of the foundations of quantum
mechanics and practical multi-party quantum communications protocols.


title:
Belief propagation, robust reconstruction and optimal recovery of block
  models

abstract:
  We consider the problem of reconstructing sparse symmetric block models with
two blocks and connection probabilities $a/n$ and $b/n$ for inter- and
intra-block edge probabilities, respectively. It was recently shown that one
can do better than a random guess if and only if $(a-b)^2>2(a+b)$. Using a
variant of belief propagation, we give a reconstruction algorithm that is
optimal in the sense that if $(a-b)^2>C(a+b)$ for some constant $C$ then our
algorithm maximizes the fraction of the nodes labeled correctly. Ours is the
only algorithm proven to achieve the optimal fraction of nodes labeled
correctly. Along the way, we prove some results of independent interest
regarding robust reconstruction for the Ising model on regular and Poisson
trees.


title:
Application of the asymptotic Taylor expansion method to bistable
  potentials

abstract:
  A recent method called Asymptotic Taylor expansion (ATEM) is applied to
determine the analytical expression for eigenfunctions and numerical results
for eigenvalues of the Schrodinger equation for the bistable potentials.
Optimal truncation of the Taylor series gives a best possible analytical
expression for eigenfunctions and numerical result for eigenvalues. It is shown
that the results are obtained by a simple algorithm constructed for a computer
system using symbolic or numerical calculation. It is observed that ATEM
produces excellent results appropriate with the existing literature.


title: On conjugacy classes in the Lie group E_8

abstract:
  This is based on a talk given at the AMS/RMS joint meeting in June 2013, Alba
Iulia.
  The main theme is that the conjugacy classes in the Lie group E_8 should be
(roughly) parametrized by conjugacy classes in the corresponding Weyl group.


title: Non-collinear interaction of photons with orbital angular momentum

abstract:
  We elucidate the consequences of a phase-matching theory that describes
second-harmonic generation of two non-collinear incident light beams that carry
orbital angular momentum (OAM). More specifically, the two incident beams
generate a third that, depending on the incident OAM, may experience a
significantly smaller conversion efficiency in comparison to that based on the
conventional phase-matching theory. This is the case even for incident angles
substantially less than those required for non-conservation of OAM in the
nonlinear interaction. Experiments are performed under different conditions and
are in excellent agreement with the theory. Our results have implications
beyond the specific case studied here of second-harmonic generation, in
particular for parametric down-conversion of photons.


title: Enhanced Harmonic Generation from M=1 aligned Ar+

abstract:
  We investigate harmonic generation (HG) from ground-state Ar+ aligned with
M=1 at a laser wavelength of 390-nm and intensity of 4x10(14) Wcm-2. Using
time-dependent R-matrix theory, we find that an initial state with magnetic
quantum number M=1 provides a 4-fold increase in harmonic yield over M=0. HG
arises primarily from channels associated with the (3)Pe threshold of Ar2+, in
contrast with M=0 for which channels associated with the excited, (1)De
threshold dominate HG. Multichannel and multielectron interferences lead to a
more marked suppression of HG for M=1 than M=0.


title: Basis invariant measure of CP-violation and renormalization

abstract:
  We analyze, in the context of a simple toy model, for which renormalization
schemes the CP-properties of bare Lagrangian and its finite part coincide. We
show that this is the case for the minimal subtraction and on-shell schemes.
The CP-properties of the theory can then be characterized by CP-odd basis
invariants expressed in terms of renormalized masses and couplings. For the
minimal subtraction scheme we furthermore show that in CP-conserving theories
the CP-odd basis invariants are zero at any scale but are not renormalization
group invariant in CP-violating ones.


title: The Dynamics of Radio Galaxies and Double-Double Radio Galaxies

abstract:
  Relativistic and magnetised plasma ejected by radio loud AGNs through jets
form the diffuse lobes of radio galaxies. The radiating particles
(electron/electron-positron) in lobes emit in radio via the synchrotron process
and X-ray via inverse-Compton scattering of cosmic microwave background
photons. The thermal environment around radio galaxies emits X-rays via the
thermal bremsstrahlung process. By combining information from these processes
we can measure physical conditions in and around the radio lobes and thus study
the dynamics of radio galaxies, including double-double radio galaxies.


title: Testing surface area with arbitrary accuracy

abstract:
  Recently, Kothari et al.\ gave an algorithm for testing the surface area of
an arbitrary set $A \subset [0, 1]^n$. Specifically, they gave a randomized
algorithm such that if $A$'s surface area is less than $S$ then the algorithm
will accept with high probability, and if the algorithm accepts with high
probability then there is some perturbation of $A$ with surface area at most
$\kappa_n S$. Here, $\kappa_n$ is a dimension-dependent constant which is
strictly larger than 1 if $n \ge 2$, and grows to $4/\pi$ as $n \to \infty$.
  We give an improved analysis of Kothari et al.'s algorithm. In doing so, we
replace the constant $\kappa_n$ with $1 + \eta$ for $\eta > 0$ arbitrary. We
also extend the algorithm to more general measures on Riemannian manifolds.


title:
Applications of Nanoparticles for Particle Physics: A Whitepaper for
  Snowmass 2013

abstract:
  The last decade has been the decade of nanotechnology, a length scale which
is of particular interest since it is here that we see the transition from the
classical to the quantum world. In this transition to the quantum regime new
phenomena appear that have proven valuable in a wide range of applications.
This whitepaper focusses on the simplest nanotechnology, the spherical
nanoparticles and their possible application to particle physics.


title: nuSTORM Project Definition Report

abstract:
  The objective of this Project Definition Report (PDR) is to document a
possible solution for the conventional facilities required to house the nuSTORM
experiment on the Fermilab site. It is recognized that this effort is done in
support of obtaining DOE approval for Critical Decision Zero.


title:
Classification of homogeneous Einstein metrics on pseudo-hyperbolic
  spaces

abstract:
  We classify the effective and transitive actions of a Lie group $G$ on an
n-dimensional non-degenerate hyperboloid (also called real pseudo-hyperbolic
space), under the assumption that $G$ is a closed, connected Lie subgroup of
$SO_0(n-r,r+1)$, the connected component of the indefinite special orthogonal
group. Assuming additionally that $G$ acts completely reducible on $\mathbb
R^{n+1}$, we also obtain that any $G$-homogeneous Einstein pseudo-Riemannian
metric on a real, complex or quaternionic pseudo-hyperbolic space, or on a
para-complex or para-quaternionic projective space is homothetic to either the
canonical metric or the Einstein metric of the canonical variation of a Hopf
pseudo-Riemannian submersion.


title: Quantum speed limit of a photon under non-Markovian dynamics

abstract:
  Quantum speed limit (QSL) under noise has drawn considerable attention in
real quantum computational processes and quantum communication. Though
non-Markovian noise is proven to be able to accelerate quantum evolution for a
damped Jaynes-Cummings model, in this work we show that non-Markovianity may
even slow down the quantum evolution of an experimentally controllable photon
system. As an important application, QSL time of a photon can be well
controlled by regulating the relevant environment parameter properly, which is
close to reach the currently available photonic experimental technology.


title: Bayesian Structural Inference for Hidden Processes

abstract:
  We introduce a Bayesian approach to discovering patterns in structurally
complex processes. The proposed method of Bayesian Structural Inference (BSI)
relies on a set of candidate unifilar HMM (uHMM) topologies for inference of
process structure from a data series. We employ a recently developed exact
enumeration of topological epsilon-machines. (A sequel then removes the
topological restriction.) This subset of the uHMM topologies has the added
benefit that inferred models are guaranteed to be epsilon-machines,
irrespective of estimated transition probabilities. Properties of
epsilon-machines and uHMMs allow for the derivation of analytic expressions for
estimating transition probabilities, inferring start states, and comparing the
posterior probability of candidate model topologies, despite process internal
structure being only indirectly present in data. We demonstrate BSI's
effectiveness in estimating a process's randomness, as reflected by the Shannon
entropy rate, and its structure, as quantified by the statistical complexity.
We also compare using the posterior distribution over candidate models and the
single, maximum a posteriori model for point estimation and show that the
former more accurately reflects uncertainty in estimated values. We apply BSI
to in-class examples of finite- and infinite-order Markov processes, as well to
an out-of-class, infinite-state hidden process.

categories: stat.ML cs.LG math.ST nlin.CD physics.data-an stat.TH


title:
Nonperturbative contributions to a resummed leptonic angular
  distribution in inclusive neutral vector boson production

abstract:
  We present an analysis of nonperturbative contributions to the transverse
momentum distribution of $Z/\gamma^*$ bosons produced at hadron colliders. The
new data on the angular distribution $\phi^*_\eta$ of Drell-Yan pairs measured
at the Tevatron is shown to be in excellent agreement with a perturbative QCD
prediction based on the Collins-Soper-Sterman (CSS) resummation formalism at
NNLL accuracy. Using these data, we determine the nonperturbative component of
the CSS resummed cross section and estimate its dependence on arbitrary
resummation scales and other factors. With the scale dependence included at the
NNLL level, a significant nonperturbative component is needed to describe the
angular data.


title:
Rejuvenated radio galaxies J0041+3224 and J1835+6204: how long can the
  quiescent phase of nuclear activity last?

abstract:
  We present radio observations of two well-known double-double radio galaxies,
J0041+3224 and J1835+6204, at frequencies ranging from 150 to 8460 MHz, using
both the Giant Metrewave Radio Telescope and the Very Large Array. These
observations, over a large radio frequency range, enable us to determine the
spectra of the inner and outer lobes. Our detailed spectral ageing analysis of
their inner and outer lobes demonstrates that the outer doubles of
double-double radio galaxies are created by the previous cycle of activity,
while the inner doubles are due to the present cycle of activity. The (core
subtracted) spectra of the inner doubles of both sources are power laws over a
large frequency range. We found that the duration of the quiescent phase of
J0041+3224 is between 4 and 28 per cent of the active phase of the previous
activity. The outer north-western lobe of J1835+6204 has a compact hotspot and
the regions of both the outer hotspots have close to power-law (rather than
curved) spectra, which indicates that the outer lobes are still fed by jet
material ejected in the previous episode just before the central engine stopped
powering the jet. We estimate that the duration of the quiescent phase of
J1835+6204 is $\lapp$5 per cent of the duration of the active phase of the
previous activity. Therefore, we conclude that the duration of the quiescent
phase can be as short as a few per cent of the active phase in radio galaxies
of this type.


title:
Fine discretization of pair interactions and an approximate analytical
  strategy for predicting equilibrium behavior of complex fluids

abstract:
  We study whether fine discretization (i.e., terracing) of continuous pair
interactions, when used in combination with first-order mean-spherical
approximation theory, can lead to a simple and general analytical strategy for
predicting the equilibrium structure and thermodynamics of complex fluids.
Specifically, we implement a version of this approach to predict how screened
electrostatic repulsions, solute-mediated depletion attractions, or ramp-shaped
repulsions modify the radial distribution function and the potential energy of
reference hard-sphere fluids, and we compare the predictions to exact results
from molecular simulations.


title: The Sakai-Sugimoto soliton

abstract:
  The Sakai-Sugimoto model is the preeminent example of a string theory
description of holographic QCD, in which baryons correspond to topological
solitons in the bulk. Here we investigate the validity of various
approximations of the Sakai-Sugimoto soliton that are used widely to study the
properties of holographic baryons. These approximations include the flat space
self-dual instanton, a linear expansion in terms of eigenfunctions in the
holographic direction and an asymptotic power series at large radius. These
different approaches have produced contradictory results in the literature
regarding properties of the baryon, such as relations for the electromagnetic
form factors. Here we determine the regions of validity of these various
approximations and show how to relate different approximations in contiguous
regions of applicability. This analysis clarifies the source of the
contradictory results in the literature and resolves some outstanding issues,
including the use of the flat space self-dual instanton, the detailed
properties of the asymptotic soliton tail, and the role of the UV cutoff
introduced in previous investigations. A consequence of our analysis is the
discovery of a new large scale, that grows logarithmically with the 't Hooft
coupling, at which the soliton fields enter a nonlinear regime. Finally, we
provide the first numerical computation of the Sakai-Sugimoto soliton and
demonstrate that the numerical results support our analysis.


title:
Episodic radio galaxies J0116$-$4722 and J1158+2621: can we constrain
  the quiescent phase of nuclear activity?

abstract:
  We present multifrequency radio observations of two well known episodic
FR\,II radio galaxies (J0116$-$4722 and J1158+2621) and a detailed
investigation of the life-cycle of episodic radio galaxies from their spectral
and radiative properties. Combining our previous work with the present results,
we either constrain or place very good limits on the active and quiescent
phases of a small sample of episodic FR\,II radio galaxies. The duration of the
quiescent phase can be as small as the hotspot fading time of the previous
episode, and as high as a few tens of Myr; however, for none of the sources in
our sample is it close to the duration of the active phase of the previous
episode. We also find that for many episodic radio galaxies, the nucleus is
variable at radio wavelengths. For our small sample of 7 episodic radio
galaxies, we find 4 to have strongly variable cores, a much larger proportion
than is generally found in samples of normal FR\,II radio galaxies. Studies
with larger samples will be required to establish a statistical association
between core variability and episodic radio activity.


title:
The primordial collisional history of Vesta: crater saturation, surface
  evolution and survival of the basaltic crust

abstract:
  This work explores the implications of the Jovian Early Bombardment (JEB) for
the evolution of the primordial Vesta, in particular in terms of crater
saturation, crustal excavation and surface erosion. Both scenarios assuming the
planetesimals having formed in a quiescent or a turbulent nebula were explored
and both primordial and collisionally evolved size-frequency distributions were
considered. The results obtained indicate that, if the basaltic surface of
Vesta were already formed, the JEB would saturate it with craters and could
erode it to depths that vary from hundreds of meters to tens of kilometres. In
the latter cases, the surface erosion caused by the JEB would be comparable
with the thickness of the eucritic and diogenitic layers of Vesta. In the cases
where the global surface erosion is limited, however, large impactors, if too
abundant, can excavate the whole crust and extract significant quantities of
material from the vestan mantle, incompatible with the present understanding of
HED meteorites. This appears to be the case if the impacting planetesimals
formed in a turbulent nebula and Jupiter migrated by 0.5 AU or more. Globally,
the results obtained suggest that the scenarios where the planetesimal formed
in a quiescent nebula and Jupiter underwent a modest migration (i.e. up to 0.5
AU) are the most consistent with our understanding of Vesta, even if the cases
of planetesimals formed in a turbulent nebula with Jupiter undergoing limited
(i.e. about 0.25 AU) or no migration cannot be ruled out. Recent results on the
differentiation of the asteroid, however, raised the possibility that Vesta
originally possessed a now-lost undifferentiated crust. In this case, the
favoured scenarios would be those where the planetesimals formed in a quiescent
nebula and Jupiter underwent a more significant migration (i.e. between 0.5 AU
and 1 AU).


title: Revisiting the Formation Rate and the Redshift Distribution of LGRBs

abstract:
  Using a novel approach, the distribution of fluences of long gamma ray bursts
derived from the Swift-BAT catalog, was reproduced by a jet-model characterized
by the distribution of the total radiated energy in $\gamma$-rays and the
distribution of the aperture angle of the emission cone. The best fit between
simulated and observed fluence distributions permits to estimate the parameters
of the model. An evolution of the median energy of the bursts is required in
order to reproduce adequately the observed redshift distribution of the events
if the formation rate of $\gamma$-ray bursts follows the cosmic star formation
rate. For our preferred model, the median jet energy evolves as $E_J \propto
e^{0.5(1+z)}$ and the mean expected jet energy is $3.0\times 10^{49}$ erg,
which agrees with the mean value derived from afterglow data. The estimated
local formation rate is $R_{grb}=290 Gpc^{-3}yr^{-1}$, representing less than
9% of the local formation rate of type Ibc supernovae. The present result
suggests also that the progenitors of long gamma ray bursts have masses $\geq
90 M_\odot$ if a Miller-Scalo initial mass function is assumed.


title:
The slingshot effect: a possible new laser-driven high energy
  acceleration mechanism for electrons

abstract:
  We show that under appropriate conditions the impact of a very short and
intense laser pulse onto a plasma causes the expulsion of surface electrons
with high energy in the direction opposite to the one of propagation of the
pulse. This is due to the combined effects of the ponderomotive force and the
huge longitudinal field arising from charge separation ("slingshot effect").
The effect should also be present with other states of matter, provided the
pulse is sufficiently intense to locally cause complete ionization. An
experimental test seems to be feasible and, if confirmed, would provide a new
extraction and acceleration mechanism for electrons, alternative to traditional
radio-frequency-based or Laser-Wake-Field ones.

categories: physics.plasm-ph hep-ph hep-th math-ph math.MP physics.acc-ph


title:
Particle acceleration and dynamics of double-double radio galaxies:
  theory vs. observations

abstract:
  In this paper we show that a small sample of radio galaxies with evidence for
multiple epochs of jet activity (so-called `double-double' radio galaxies) have
the same electron injection spectral index in the two activity episodes, a
result which might be considered surprising given the very different lobe
dynamics expected in the first and second episode. We construct models for the
dynamics of radio galaxies, with an emphasis on their episodic behaviour, and
show that hotspot formation and confinement of lobes for the inner double of
double-double radio galaxies are possible even without any thermal matter in
the outer cocoon. We argue that (i) the observed similar injection spectral
indices are due to similar jet powers in the two episodes, (ii) the `spectral
index--radio power' correlation of a flux limited sample of radio galaxies is
the primary one, and not the `spectral index--redshift correlation', (iii) jets
are made of pair plasma and not electron-proton, (iv) and the Lorentz factor of
the spine of the jet should be $\gapp 10$ to explain the observations.
Furthermore, we argue that the observations show that higher power radio
galaxies do not have a higher jet bulk Lorentz factors, but instead simply have
a higher number density of particles in the jet rest frame. A consequence of
our models is that aligned double-double radio galaxies with very old
($\gapp10^8$ yr) outer doubles, or misaligned double-double radio galaxies, are
statistically more likely to have dissimilar injection indices in two different
episodes, as they will probably have different jet powers.


title:
The (IR-)relevance of the Gribov ambiguity in SU(2) x U(1) gauge
  theories with fundamental Higgs matter

abstract:
  It is well accepted that dealing with the Gribov ambiguity has a major impact
on correlation functions in gauge-fixed Yang-Mills theories, in particular in
the low momentum regime where standard perturbation theory based on the
Faddeev-Popov approach fails. Recent results, derived from functional tools
(Dyson-Schwinger equations or exact RG) or the effective Gribov-Zwanziger
action method, pointed towards e.g. gauge boson correlation functions that are
not compatible with the properties of observable degrees of freedom. Although
such an observation is a welcome feature for gauge theories exhibiting
confinement, it would be a discomfort for gauge theories supplemented with
Higgs fields, cfr. the experimental success of the electroweak model based on a
SU(2) x U(1) gauge group. The purpose of this short note is to assure that the
effective action resolution to the Gribov ambiguity reduces to the standard
Faddeev-Popov method in the perturbative regime of sufficiently small
coupling/large Higgs condensate, thereby not compromising the physical particle
spectrum of massive gauge bosons and a massless photon for the SU(2) x U(1)
gauge-Higgs model. The closer the theory gets to the limit of vanishing Higgs
condensate, the more the Gribov problem resurfaces with all its consequences.
We give some speculations w.r.t. the Fradkin-Shenker insights about the phase
diagram.


title: Atomism and Relationalism as guiding principles for Quantum Gravity

abstract:
  The research in quantum gravity has jauntily grown in the recent years,
intersecting with conceptual and philosophical issues that have a long history.
In this paper I analyze the conceptual basis on which Loop Quantum Gravity has
grown, the way it deals with some classical problems of philosophy of science
and the main methodological and philosophical assumptions on which it is based.
In particular, I emphasize the importance that atomism (in the broadest sense)
and relationalism have had in the construction of the theory.


title: On the regularity of American options with regime-switching uncertainty

abstract:
  We study the regularity of the stochastic representation of the solution of a
class of initial-boundary value problems related to a regime-switching
diffusion. This representation is related to the value function of a
finite-horizon optimal stopping problem such as the price of an American-style
option in finance. We show continuity and smoothness of the value function
using coupling and time-change techniques. As an application, we find the
minimal payoff scenario for the holder of an American-style option in the
presence of regime-switching uncertainty under the assumption that the
transition rates are known to lie within level-dependent compact sets.


title:
Direct Optical Coupling to an Unoccupied Dirac Surface State in the
  Topological Insulator Bi$_2$Se$_3$

abstract:
  We characterize the occupied and unoccupied electronic structure of the
topological insulator Bi$_2$Se$_3$ by one-photon and two-photon angle-resolved
photoemission spectroscopy and slab band structure calculations. We reveal a
second, unoccupied Dirac surface state with similar electronic structure and
physical origin to the well-known topological surface state. This state is
energetically located 1.5 eV above the conduction band, which permits it to be
directly excited by the output of a Ti:Sapphire laser. This discovery
demonstrates the feasibility of direct ultrafast optical coupling to a
topologically protected, spin-textured surface state.


title:
Exploring the conformational dynamics of alanine dipeptide in solution
  subjected to an external electric field: A nonequilibrium molecular dynamics
  simulation

abstract:
  In this paper, we investigate the conformational dynamics of alanine
dipeptide under an external electric field by nonequilibrium molecular dynamics
simulation. We consider the case of a constant and of an oscillatory field. In
this context we propose a procedure to implement the temperature control, which
removes the irrelevant thermal effects of the field. For the constant field
different time-scales are identified in the conformational, dipole moment, and
orientational dynamics. Moreover, we prove that the solvent structure only
marginally changes when the external field is switched on. In the case of
oscillatory field, the conformational changes are shown to be as strong as in
the previous case, and non-trivial nonequilibrium circular paths in the
conformation space are revealed by calculating the integrated net probability
fluxes.


title:
Maximum eigenvalue of symmetric random matrices with dependent heavy
  tailed entries

abstract:
  This paper deals with symmetric random matrices whose upper diagonal entries
are obtained from a linear random field with heavy tailed noise. It is shown
that the maximum eigenvalue and the spectral radius of such a random matrix
with dependent entries converge to the Frech\'et distribution after appropriate
scaling. This extends a seminal result of Soshnikov(2004) when the tail index
is strictly less than one.


title: The Panic Model: Flocking with Minimal Cooperativity

abstract:
  We present a 2D lattice model of self-propelled spins that can only change
direction upon collision with another spin. We show that even with ballistic
motion and minimal cooperativity, these spins display robust flocking behavior
at nearly all densities, forming long bands of stripes. The structural
transition in this system can be characterized by an order parameter, and we
demonstrate that if this parameter is studied as a dynamical variable rather
than a steady-state observable, we can extract a detailed picture of how the
flocking mechanism varies with density.


title: Origin of conical dispersion relations

abstract:
  A mechanism that produces conical dispersion relations is presented. A Kronig
Penney one dimensional array with two different strengths delta function
potentials gives rise to both the gap closure and the dispersion relation
observed in graphene and other materials. The Schr\''odinger eigenvalue problem
is locally invariant under the infinite dimensional Virasoro algebra near
conical dispersion points in reciprocal space, thus suggesting a possible
relation to string theory.


title: A binary deletion channel with a fixed number of deletions

abstract:
  Suppose a binary string x = x_1...x_n is being broadcast repeatedly over a
faulty communication channel. Each time, the channel delivers a fixed number m
of the digits (m<n) with the lost digits chosen uniformly at random, and the
order of the surviving digits preserved. How large does m have to be to
reconstruct the message?


title: Normal forms of topologically quasi-homogeneous foliations on $(\C^2,0)$

abstract:
  The aim of this paper is to construct formal normal forms for the class of
topologically quasi-homogeneous foliations under generic conditions. Any such
normal form is given as the sum of three terms: an initial generic
quasi-homogeneous term, a hamiltonian term and a radial term. Moreover, we also
show that the number of free coefficients in the hamiltonian part is consistent
with the dimension of Mattei's moduli space of unfoldings.


title: Testing for a {\delta}-neighborhood of a generalized Pareto copula

abstract:
  A multivariate distribution function F is in the max-domain of attraction of
an extreme value distribution if and only if this is true for the copula
corresponding to F and its univariate margins. Aulbach et al. (2012a) have
shown that a copula satisfies the extreme value condition if and only if the
copula is tail equivalent to a generalized Pareto copula (GPC). In this paper
we propose a chi-square goodness-of-fit test in arbitrary dimension for testing
whether a copula is in a certain neighborhood of a GPC. The test can be applied
to stochastic processes as well to check whether the corresponding copula
process is close to a generalized Pareto process. Since the p-value of the
proposed test is highly sensitive to a proper selection of a certain threshold,
we also present a graphical tool that makes the decision, whether or not to
reject the hypothesis, more comfortable.


title:
On centralizers of interval diffeomorphisms in critical (intermediate)
  regularity

abstract:
  We extend to the critical (intermediate) regularity several results
concerning rigidity for centralizers and group actions on the interval.


title:
The loss-limited electron energy in SN 1006: effects of the shock
  velocity and of the diffusion process

abstract:
  The spectral shape of the synchrotron X-ray emission from SN 1006 reveals the
fundamental role played by radiative losses in shaping the high-energy tail of
the electron spectrum. We analyze data from the XMM-Newton SN 1006 Large
Program and confirm that in both nonthermal limbs the loss-limited model
correctly describes the observed spectra. We study the physical origin of the
observed variations of the synchrotron cutoff energy across the shell. We
investigate the role played by the shock velocity and by the electron
gyrofactor. We found that the cutoff energy of the syncrotron X-ray emission
reaches its maximum value in regions where the shock has experienced its
highest average speed. This result is consistent with the loss-limited
framework. We also find that the electron acceleration in both nonthermal limbs
of SN 1006 proceeds close to the Bohm diffusion limit, the gyrofactor being in
the range 1.5-4. We finally investigate possible explanations for the low
values of cutoff energy measured in thermal limbs.


title:
Fractal-cluster theory and thermodynamic principles of the control and
  analysis for the self-organizing systems

abstract:
  The theory of resource distribution in self-organizing systems on the basis
of the fractal-cluster method has been presented. This theory consists of two
parts: determined and probable. The first part includes the static and dynamic
criteria, the fractal-cluster dynamic equations which are based on the
fractal-cluster correlations and Fibonacci's range characteristics. The second
part of the one includes the foundations of the probable characteristics of the
fractal-cluster system. This part includes the dynamic equations of the
probable evolution of these systems. By using the numerical researches of these
equations for the stationary case the random state field of the one in the
phase space of the $D$, $H$, $F$ criteria have been obtained. For the
socio-economical and biological systems this theory has been tested.


title: Automated Password Extraction Attack on Modern Password Managers

abstract:
  To encourage users to use stronger and more secure passwords, modern web
browsers offer users password management services, allowing users to save
previously entered passwords locally onto their hard drives. We present Lupin,
a tool that automatically extracts these saved passwords without the user's
knowledge. Lupin allows a network adversary to obtain passwords as long as the
login form appears on a non-HTTPS page. Unlike existing password sniffing
tools, Lupin can obtain passwords for websites users are not visiting.
Furthermore, Lupin can extract passwords embedded in login forms with a
destination address served in HTTPS. To determine the number of websites
vulnerable to our attack, we crawled the top 45,000 most popular websites from
Alexa's top website list and discovered that at least 28% of these sites are
vulnerable. To further demonstrate the feasibility of our attack, we tested
Lupin under controlled conditions using one of the authors' computers. Lupin
was able to extract passwords from 1,000 websites in less than 35 seconds. We
suggest techniques for web developers to protect their web applications from
attack, and we propose alternative designs for a secure password manager.


title:
Voltage-induced strain control of the magnetic anisotropy in a Ni thin
  film on flexible substrate

abstract:
  Voltage-induced magnetic anisotropy has been quantitatively studied in
polycrystalline Ni thin film deposited on flexible substrate using microstrip
ferromagnetic resonance. This anisotropy is induced by a piezoelectric actuator
on which the film/substrate system was glued. In our work, the control of the
anisotropy through the applied elastic strains is facilitated by the compliant
elastic behavior of the substrate. The in-plane strains in the film induced by
the piezoelectric actuation have been measured by the digital image correlation
technique. Non-linear variation of the resonance field as function of the
applied voltage is found and well reproduced by taking into account the non
linear and hysteretic variations of the induced in-plane strains as function of
the applied voltage. Moreover, we show that initial uniaxial anisotropy
attributed to compliant substrate curvature is fully compensated by the voltage
induced anisotropy.


title:
Algorithmic Data Analytics, Small Data Matters and Correlation versus
  Causation

abstract:
  This is a review of aspects of the theory of algorithmic information that may
contribute to a framework for formulating questions related to complex highly
unpredictable systems. We start by contrasting Shannon Entropy and
Kolmogorov-Chaitin complexity epitomizing the difference between correlation
and causation to then move onto surveying classical results from algorithmic
complexity and algorithmic probability, highlighting their deep connection to
the study of automata frequency distributions. We end showing how long-range
algorithmic predicting models for economic and biological systems may require
infinite computation but locally approximated short-range estimations are
possible thereby showing how small data can deliver important insights into
important features of complex "Big Data".


title:
Clarification on the Mapping of Reversible Circuits to the NCV-v1
  Library

abstract:
  In previous work and motivated by a theoretical discussion on physical
realizations, a new quantum gate library (the NCV-v1 library) for electronic
design automation of quantum circuits has been proposed. Here, qudits instead
of qubits are assumed, i.e. a basic building block which does not rely on a two
level quantum system but a (multiple-valued) d-level quantum system is assumed.
However, the descriptions on the foundation of this new library remained brief.
This technical report provides an extended description of the applied ideas and
concepts.


title:
Fundamental Theorem of Asset Pricing under Transaction costs and Model
  uncertainty

abstract:
  We prove the Fundamental Theorem of Asset Pricing for a discrete time
financial market where trading is subject to proportional transaction cost and
the asset price dynamic is modeled by a family of probability measures,
possibly non-dominated. Using a backward-forward scheme, we show that when the
market consists of a money market account and a single stock, no-arbitrage in a
quasi-sure sense is equivalent to the existence of a suitable family of
consistent price systems. We also show that when the market consists of
multiple dynamically traded assets and satisfies \emph{efficient friction},
strict no-arbitrage in a quasi-sure sense is equivalent to the existence of a
suitable family of strictly consistent price systems.


title:
Finite temperature effective field theory and two-band superfluidity in
  Fermi gases

abstract:
  We develop a description of fermionic superfluids in terms of an effective
field theory for the pairing order parameter. Our effective field theory
improves on the existing Ginzburg - Landau theory for superfluid Fermi gases in
that it is not restricted to temperatures close to the critical temperature.
This is achieved by taking into account long-range fluctuations to all orders.
The results of the present effective field theory compare well with the results
obtained in the framework of the Bogoliubov - de Gennes method. The advantage
of an effective field theory over Bogoliubov - de Gennes calculations is that
much less computation time is required. In the second part of the paper, we
extend the effective field theory to the case of a two-band superfluid. The
present theory allows us to reveal the presence of two healing lengths in the
two-band superfluids, to analyze the finite-temperature vortex structure in the
BEC-BCS crossover, and to obtain the ground state parameters and spectra of
collective excitations. For the Leggett mode our treatment provides an
interpretation of the observation of this mode in two-band superconductors.


title:
Distances, Luminosities, and Temperatures of the Coldest Known
  Substellar Objects

abstract:
  The coolest known brown dwarfs are our best analogs to extrasolar gas-giant
planets. The prolific detections of such cold substellar objects in the past
two years has spurred intensive followup, but the lack of accurate distances is
a key gap in our understanding. We present a large sample of precise distances
based on homogeneous mid-infrared astrometry that robustly establish absolute
fluxes, luminosities, and temperatures. The coolest brown dwarfs have
temperatures of 400-450 K and masses ~5-20 times that of Jupiter, showing they
bridge the gap between hotter brown dwarfs and gas-giant planets. At these
extremes, spectral energy distributions no longer follow a simple
correspondence with temperature, suggesting an increasing role of other
physical parameters such as surface gravity, vertical mixing, clouds, and
metallicity.


title: Velocity slip on curved surfaces

abstract:
  The Navier boundary condition for velocity slip on flat surfaces, when
expressed in tensor form, is readily extended to surfaces of any shape. We test
this assertion using molecular dynamics simulations of flow in channels with
flat and curved walls and for rotating cylinders and spheres, all for a wide
range of solid-liquid interaction strengths. We find that the slip length as
conventionally measured at a flat wall in Couette flow is the same as that for
all other cases with curved and rotating boundaries, provided the atomic
interactions are the same and boundary shape is properly taken into account.
These results support the idea that the slip length is a material property,
transferable between different flow configurations.


title: Event shapes in N=4 super-Yang-Mills theory

abstract:
  We study event shapes in N=4 SYM describing the angular distribution of
energy and R-charge in the final states created by the simplest half-BPS scalar
operator. Applying the approach developed in the companion paper
arXiv:1309.0769, we compute these observables using the correlation functions
of certain components of the N=4 stress-tensor supermultiplet: the half-BPS
operator itself, the R-symmetry current and the stress tensor. We present
master formulas for the all-order event shapes as convolutions of the Mellin
amplitude defining the correlation function of the half-BPS operators, with a
coupling-independent kernel determined by the choice of the observable. We find
remarkably simple relations between various event shapes following from N=4
superconformal symmetry. We perform thorough checks at leading order in the
weak coupling expansion and show perfect agreement with the conventional
calculations based on amplitude techniques. We extend our results to strong
coupling using the correlation function of half-BPS operators obtained from the
AdS/CFT correspondence.


title: Thermal amplification of field-correlation harvesting

abstract:
  We study the harvesting of quantum and classical correlations from a hot
scalar field in a periodic cavity by a pair of spatially separated
oscillator-detectors. Specifically, we utilize non-perturbative and exact
(non-numerical) techniques to solve for the evolution of the detectors-field
system and then we examine how the entanglement, Gaussian quantum discord, and
mutual information obtained by the detectors change with the temperature of the
field. While (as expected) the harvested entanglement rapidly decays to zero as
temperature is increased, we find remarkably that both the mutual information
and the discord can actually be increased by multiple orders of magnitude via
increasing the temperature. We go on to explain this phenomenon by taking
advantage of the translational invariance of the field and use this to make
accurate predictions of the behavior of thermal amplification; by this we also
introduce a new perspective on field-correlation harvesting that we feel is
worthy of consideration in its own right. The thermal amplification of discord
harvesting represents an exciting prospect for discord-based quantum
computation, including its use in entanglement activation.


title: Geometric transversality in higher genus Gromov-Witten theory

abstract:
  The construction of manifold structures and fundamental classes on the
(compactified) moduli spaces appearing in Gromov-Witten theory is a
long-standing problem. Up until recently, most successful approaches involved
the imposition of topological constraints like semi-positivity on the
underlying symplectic manifold to deal with this situation. One conceptually
very appealing approach that removed most of these restrictions is the approach
by K. Cieliebak and K. Mohnke via complex hypersurfaces, [CM07]. In contrast to
other approaches using abstract perturbation theory, it has the advantage that
the objects to be studied still are spaces of holomorphic maps defined on
Riemann surfaces.
  This article aims to generalise this from the case of surfaces of genus 0
dealt with in [CM07] to the general case, also using some of the methods from
[IP03] and symplectic field theory, namely the compactness results from
[BEH+03].


title: Phase Transition in Dimer Liquids

abstract:
  We study the phase transition in a system composed of dimers interacting with
each other via a nearest-neighbor (NN) exchange $J$ and competing interactions
taken from a truncated dipolar coupling. Each dimer occupies a link between two
nearest sites of a simple cubic lattice. We suppose that dimers are
self-avoiding and can have only three orientations which coincide with the $x$,
$y$ or $z$ direction. The interaction $J$ is attractive if the two dimers are
parallel with each other at the NN distance, zero otherwise. The truncated
dipolar interaction is characterized by two parameters: its amplitude $D$ and
the cutoff distance $r_c$. Using the steepest-descent method, we determine the
ground-state (GS) configuration as functions of $D$ and $r_c$. We then use
Monte Carlo simulations to investigate the nature of the low-temperature phase
and to determine characteristics of the phase transition from the ordered phase
to the disordered phase at high temperatures at a given dimer concentration. We
show that as the temperature increases, dimers remain in the compact state and
the transition from the low-$T$ compact phase to the disordered phase where
dimers occupy the whole space is of second order when $D$ is small, but it
becomes of first order for large enough $D$, for both polarized and non
polarized dimers. This transition has a resemblance with the unfolding polymer
transition. The effect of $r_c$ is discussed.


title: Experiments in Sustainable Software Practices for Future Architectures

abstract:
  In the process of rewriting large physics codes at Los Alamos National
Laboratory to perform well on new architectures such as many-core, GPU, and
Intel MIC, we have found a number of areas in which sustainable software
practices can provide significant advantages. We describe several specific
advantages of sustainable practices for future architectures, and report on two
small experimental projects at LANL intended to raise awareness of new software
practices and programming approaches for new architectures.


title: Counting unlabeled k-trees

abstract:
  We count unlabeled k-trees by properly coloring them in k+1 colors and then
counting orbits of these colorings under the action of the symmetric group on
the colors.


title: Amenability and Ramsey theory in the metric setting

abstract:
  Moore characterized the amenability of automorphism groups of countable
ultrahomogeneous structures by a Ramsey-type property. We extend this result to
automorphism groups of metric Fra\"iss\'e structures, which encompass all
Polish groups. As an application, we prove that amenability is a G_delta
condition.


title: A characterization of Blaschke addition

abstract:
  A characterization of Blaschke addition as a map between origin-symmetric
convex bodies is established. This results from a new characterization of
Minkowski addition as a map between origin-symmetric zonoids, combined with the
use of L\'{e}vy-Prokhorov metrics. A full set of examples is provided that show
the results are in a sense the best possible.


title: Ordered Probability Mass Function

abstract:
  Suppose that in the four tests Alice's scores are 90, 95, 85, 90, and Bob's
scores are 85, 95, 90, 90. How to evaluate their scores? In this paper, we
introduce the concept of ordered probability mass function which can be used to
find a probability mass function with smaller variance. More interestingly, we
can use it to distinguish sequences of positive numbers statistically.