title: Sequential State Discrimination and Requirement of Quantum Dissonance

abstract:
  We study the procedure for sequential unambiguous state discrimination. A
qubit is prepared in one of two possible states, and measured by two observers
Bob and Charlie sequentially. A necessary condition for the state to be
unambiguously discriminated by Charlie is the absence of entanglement between
the principal qubit, prepared by Alice, and Bob's auxiliary system. In general,
the procedure for both Bob and Charlie to recognize between two nonorthogonal
states conclusively relies on the availability of quantum discord which is
precisely the quantum dissonance when the entanglement is absent. In Bob's
measurement, the left discord is positively correlated with the information
extracted by Bob, and the right discord enhances the information left to
Charlie. When their product achieves its maximum the probability for both Bob
and Charlie to identify the state achieves its optimal value.


title: Syntactic sensitive complexity for symbol-free sequence

abstract:
  This work uses the L-system to construct a tree structure for the text
sequence and derives its complexity. It serves as a measure of structural
complexity of the text. It is applied to anomaly detection in data
transmission.


title:
Quasinormal modes of charged dilaton black holes and their entropy
  spectra

abstract:
  In this study, we employ the scalar perturbations of the charged dilaton
black hole (CDBH) found by Chan, Horne and Mann (CHM), and described with an
action which emerges in the low-energy limit of the string theory. A CDBH is
neither asymptotically flat (AF) nor non-asymptotically flat (NAF) spacetime.
Depending on the value of its dilaton parameter "a", it has both Schwarzschild
and linear dilaton black hole (LDBH) limits. We compute the complex frequencies
of the quasinormal modes (QNMs) of the CDBH by considering small perturbations
around its horizon. By using the highly damped QNMs in the process prescribed
by Maggiore, we obtain the quantum entropy and area spectra of these BHs.
Although the QNM frequencies are tuned by "a", we show that the quantum spectra
do not depend on "a", and they are equally spaced. On the other hand, the
obtained value of undetermined dimensionless constant {\epsilon} is the double
of Bekenstein's result. The possible reason of this discrepancy is also
discussed.


title: Ap\'ery Polynomials and the multivariate Saddle Point Method

abstract:
  The Ap\'ery polynomials and in particular their asymptotic behavior play an
essential role in the understanding of the irrationality of \zeta(3). In this
paper, we present a method to study the asymptotic behavior of the sequence of
the Ap\'ery polynomials ((B_{n})_{n=1}^{\infty}) in the whole complex plane as
(n\rightarrow \infty). The proofs are based on a multivariate version of the
complex saddle point method. Moreover, the asymptotic zero distributions for
the polynomials ((B_{n})_{n=1}^{\infty}) and for some transformed Ap\'ery
polynomials are derived by means of the theory of logarithmic potentials with
external fields, establishing a characterization as the unique solution of a
weighted equilibrium problem. The method applied is a general one, so that the
treatment can serve as a model for the study of objects related to the Ap\'ery
polynomials.


title:
Interplay between surface anisotropy and dipolar interactions in an
  assembly of nanomagnets

abstract:
  We study the interplay between the effects of surface anisotropy and dipolar
interactions in monodisperse assemblies of nanomagnets with oriented
anisotropy. We derive asymptotic formulas for the assembly magnetization taking
account of temperature, applied field, core and surface anisotropy, and dipolar
inter-particle interactions. We find that the interplay between surface
anisotropy and dipolar interactions is well described by the analytical
expression of the assembly magnetization derived here: the overall sign of the
product of the two parameters governing the surface and the dipolar
contributions determines whether intrinsic and collective terms compete or have
synergistic effects on the magnetization. This is illustrated by the
magnetization curves of $\gamma-Fe_{2}O_{3}$ nanoparticles assemblies in the
low concentration limit.


title: Exponential growth of bifurcating processes with ancestral dependence

abstract:
  Branching processes are classical growth models in cell kinetics. In their
construction, it is usually assumed that cell lifetimes are independent random
variables, which has been proved false in experiments. Models of dependent
lifetimes are considered here, in particular bifurcating Markov chains. Under
hypotheses of stationarity and multiplicative ergodicity, the corresponding
branching process is proved to have the same type of asymptotics as its classic
counterpart in the i.i.d. supercritical case: the cell population grows
exponentially, the growth rate being related to the exponent of multiplicative
ergodicity, in a similar way as to the Laplace transform of lifetimes in the
i.i.d. case. An identifiable model for which the multiplicative ergodicity
coefficients and the growth rate can be explicitly computed is proposed.


title:
The Two-Band Luttinger Liquid with Spin-Orbit Coupling: Applications to
  Monatomic Chains on Surfaces

abstract:
  Recently, monatomic chains on surfaces have been synthesized which show
evidence of Luttinger liquid physics. The experimental data point to a
dispersion along the chain with four Fermi points. Here we investigate a
general low-energy effective Hamiltonian for such a two-band model where SU(2)
spin symmetry is broken but time reversal symmetry persists, as is expected due
to the surface geometry. Spin-orbit coupling gives rise to a new energy scale
epsilon_{SO} much smaller than the Fermi energy epsilon_F and to spin
non-conserving scattering processes. We derive the generic phase diagram at
zero temperature as well as an effective phase diagram at temperatures
epsilon_{SO} < T << epsilon_F. For the part of the phase diagram where a
Luttinger liquid is found to be stable, the density of states and the spectral
function are calculated and discussed in relation to the experimental data.


title:
Performance Bounds for the Scenario Approach and an Extension to a Class
  of Non-convex Programs

abstract:
  We consider the Scenario Convex Program (SCP) for two classes of optimization
problems that are not tractable in general: Robust Convex Programs (RCPs) and
Chance-Constrained Programs (CCPs). We establish a probabilistic bridge from
the optimal value of SCP to the optimal values of RCP and CCP in which the
uncertainty takes values in a general, possibly infinite dimensional, metric
space. We then extend our results to a certain class of non-convex problems
that includes, for example, binary decision variables. In the process, we also
settle a measurability issue for a general class of scenario programs, which to
date has been addressed by an assumption. Finally, we demonstrate the
applicability of our results on a benchmark problem and a problem in fault
detection and isolation.


title: On a class of Einstein Finsler metrics

abstract:
  In this paper, we study a class of Finsler metrics called general
(\alpha,\beta)-metrics, which are defined by a Riemannian metric and an 1-form.
We construct some general (\alpha,\beta)-metrics with constant Ricci curvature.


title:
Non-Smooth Saddle-Node Bifurcations of Forced Monotone Interval Maps I:
  Existence of an SNA

abstract:
  We study one-parameter families of quasi-periodically forced monotone
interval maps and provide sufficient conditions for the existence of a
parameter at which the respective system possesses a non-uniformly hyperbolic
attractor. This is equivalent to the existence of a sink-source orbit, that is,
an orbit with positive Lyapunov exponent both forwards and backwards in time.
The attractor itself is a non-continuous invariant graph with negative Lyapunov
exponent, often referred to as "SNA". In contrast to former results in this
direction, our conditions are C^2-open in the fibre maps.
  By applying a general result about saddle-node bifurcations in skew products,
we obtain a conclusion on the occurrence of non-smooth bifurcations in the
respective families. Explicit examples show the applicability of the derived
statements.


title:
Centre-of-mass motion-induced decoherence and entanglement generation in
  a hybrid quantum repeater

abstract:
  Quantum communication over long distances relies on the ability to create
entanglement between two remote quantum nodes. Recent proposals aiming at
experimental realization propose a hybrid quantum repeater setup where two
distant material qubits are entangled by light-matter interaction. Motivated by
these developments, we investigate possible decoherence effects originating
from the centre- of-mass motion of the spatially well separated trapped qubits.
Within the Lamb-Dicke regime we use photon exchange involving coherent states
of the radiation field to entangle the two material qubits. Optimal generalized
photonic field measurements are used to achieve entangled qubit pairs with high
fidelities and high success probabilities. We demonstrate that the quality of
the achievable two-qubit entanglement crucially depends on the trap frequencies
involved. Furthermore, dynamical decoupling schemes are proposed which are
capable of suppressing centre-of-mass-motion-induced decoherence effects
significantly and which involve only local operations acting on the spatially
well-separated material qubits.


title:
Replacing Network Coordinate System with Internet Delay Matrix Service
  (IDMS): A Case Study in Chinese Internet

abstract:
  Network distance (Round Trip Time, RTT) is an important parameter for many
Internet distributed systems to optimize their performances. Network Coordinate
System (NCS) is assumed as a lightweight and scalable mechanism to predict
network distance between any two Internet hosts without explicit measurements.
Though many NCSes have been proposed in the literatures, they are not
satisfactory in terms of accuracy. In this paper, we propose to use delay
matrix to replace the NCS. This paper makes three contributions. First, we show
that not all the hosts need an independent network coordinate (NC). On the
contrary, most hosts can be represented as one or several nodes in NCS. Second,
we present an Internet Delay Matrix Service (IDMS) for representing network
distances without explicit measurements in Internet. Third, we describe two
delay matrices up to date delay matrix (UDM) and previous delay matrices (PDM)
for representing the network distances. Extensive simulations on our collected
Chinese Internet data sets show that IDMS is an accurate, efficient, scalable
and practical method for Chinese Internet. The performance of IDMS is better
than other existing approaches.


title:
Elliptic regularity theory applied to time harmonic anisotropic
  Maxwell's equations with less than Lipschitz complex coefficients

abstract:
  The focus of this paper is the study of the regularity properties of the time
harmonic Maxwell's equations with anisotropic complex coefficients, in a
bounded domain with $C^{1,1}$ boundary. We assume that at least one of the
material parameters is $W^{1,3+\delta}$ for some $\delta>0$. Using regularity
theory for second order elliptic partial differential equations, we derive
$W^{1,p}$ estimates and H\"older estimates for electric and magnetic fields up
to the boundary. We also derive interior estimates in bi-anisotropic media.


title:
Mixed quantum-classical dynamics on the exact time-dependent potential
  energy surface: A fresh look at non-adiabatic processes

abstract:
  The exact nuclear time-dependent potential energy surface arises from the
exact decomposition of electronic and nuclear motion, recently presented in [A.
Abedi, N. T. Maitra, and E. K. U. Gross, Phys. Rev. Lett. 105, 123002 (2010)].
Such time-dependent potential drives nuclear motion and fully accounts for the
coupling to the electronic subsystem. We investigate the features of the
potential in the context of electronic non-adiabatic processes and employ it to
study the performance of the classical approximation on nuclear dynamics. We
observe that the potential, after the nuclear wave-packet splits at an avoided
crossing, develops dynamical steps connecting different regions, along the
nuclear coordinate, in which it has the same slope as one or the other
adiabatic surface. A detailed analysis of these steps is presented for systems
with different non-adiabatic coupling strength. The exact factorization of the
electron-nuclear wave-function is at the basis of the decomposition. In
particular, the nuclear part is the true nuclear wave-function, solution of a
time-dependent Schroedinger euqation and leading to the exact many-body density
and current density. As a consequence, the Ehrenfest theorem can be extended to
the nuclear subsystem and Hamiltonian, as discussed here with an analytical
derivation and numerical results.


title:
Analysis of the solar coronal green line profiles from eclipse
  observations

abstract:
  Analysis of the solar coronal green line profiles reveals information
regarding the physical conditions of the solar corona like temperature,
density, Doppler velocity, non-thermal velocity etc. It provides insights to
the unresolved problems like the coronal heating and the acceleration of the
solar winds. Recent studies have reported excess blueshifts in the coronal line
profiles and are interpreted as due to nanoflare heating, type II spicules and
nascent solar wind flow. We have analyzed a time series of Fabry-Perot
interferograms of the solar corona obtained during the total solar eclipse of
2001 June 21 from Lusaka, Zambia. The spatial behavior of the coronal green
line profiles were examined and variations in intensity, linewidth, Doppler
velocity and line asymmetry were obtained. Several line profiles showed
asymmetry indicating the presence of multicomponents. Such line profiles were
fitted with double Gaussian curves. It has been found that 42% of the line
profiles were single components, 34% were blueshifted, and 24% were red
shifted. The secondary component of a typical line profile with blue asymmetry
is found to have a relative intensity about 0.26, Doppler velocity around -30
km/s and a halfwidth about 0.65A.


title: Chermak-Delgado Lattice Extension Theorems

abstract:
  In a finite group G with subgroup H, the Chermak-Delgado measure of H (in G)
is defined as the product of the order of H with the order of the centralizer
of H. The Chermak-Delgado lattice of G, denoted CD(G), is the set of all
subgroups with maximal Chermak-Delgado measure; this set is a sublattice within
the subgroup lattice of G. In this paper we provide an example of a p-group P,
for any prime p, where CD(P) is lattice isomorphic to 2 copies of M_4 (a
quasiantichain of width 2) that are adjoined maximum-to-minimum. We introduce
terminology to describe this structure, called a 2-string of 2-diamonds, and we
also give two constructions for generalizing the example. The first
generalization results in a p-group with Chermak-Delgado lattice that, for any
positive integers n and l, is a 2l-string of n-dimensional cubes adjoined
maximum-to-minimum and the second generalization gives a construction for a
p-group with Chermak-Delgado lattice that is a 2l-string of M_(p+3)
(quasiantichains, each of width p + 1) adjoined maximum-to-minimum.


title:
SWEET-Cat: A catalogue of parameters for Stars With ExoplanETs I. New
  atmospheric parameters and masses for 48 stars with planets

abstract:
  Due to the importance that the star-planet relation has to our understanding
of the planet formation process, the precise determination of stellar
parameters for the ever increasing number of discovered extra-solar planets is
of great relevance. Furthermore, precise stellar parameters are needed to fully
characterize the planet properties. It is thus important to continue the
efforts to determine, in the most uniform way possible, the parameters for
stars with planets as new discoveries are announced. In this paper we present
new precise atmospheric parameters for a sample of 48 stars with planets. We
then take the opportunity to present a new catalogue of stellar parameters for
FGK and M stars with planets detected by radial velocity, transit, and
astrometry programs. Stellar atmospheric parameters and masses for the 48 stars
were derived assuming LTE and using high resolution and high signal-to-noise
spectra. The methodology used is based on the measurement of equivalent widths
for a list of iron lines and making use of iron ionization and excitation
equilibrium principles. For the catalog, and whenever possible, we used
parameters derived in previous works published by our team, using well defined
methodologies for the derivation of stellar atmospheric parameters. This set of
parameters amounts to over 65% of all planet host stars known, including more
than 90% of all stars with planets discovered through radial velocity surveys.
For the remaining targets, stellar parameters were collected from the
literature.


title: Measurement and control of the fast ion redistribution on MAST

abstract:
  Previous experiments on MAST and other tokamaks have indicated that the level
of fast ion redistribution can exceed that expected from classical diffusion
and that this level increases with beam power. In this paper we present a
quantification of this effect in MAST plasmas using a recently commissioned
scanning neutron camera. The observed fast ion diffusivity correlates with the
amplitude of n=1 energetic particle modes, indicating that they are the
probable cause of the non-classical fast ion diffusion in MAST. Finally, it
will be shown that broadening the fast ion pressure profile by the application
of neutral beam injection at an off-axis location can mitigate the growth of
these modes and result in the classical fast ion behaviour


title:
Equilibration of anisotropic quark-gluon plasma produced by decays of
  color flux tubes

abstract:
  A set of kinetic equations is used to study equilibration of the anisotropic
quark-gluon plasma produced by decays of color flux tubes possibly created at
the very early stages of ultra-relativistic heavy-ion collisions. The decay
rates of the initial color fields are given by the Schwinger formula, and the
collision terms are treated in the relaxation-time approximation. By connecting
the relaxation time with viscosity we are able to study production and
thermalization processes in the plasma characterized by different values of the
ratio of the shear viscosity to entropy density, eta/s. For the lowest (KSS)
value of this ratio, 4 pi eta/s = 1, and realistic initial conditions for the
fields, the system approaches the viscous-hydrodynamics regime within 1-2 fm/c.
On the other hand, for larger values of the viscosity, 4 pi eta/s greater or
equal to 3, the collisions in the plasma become inefficient to destroy
collective phenomena which manifest themselves as oscillations of different
plasma parameters. The presence of such oscillations brings in differences
between the kinetic and hydrodynamic descriptions, which suggest that the
viscous-hydrodynamics approach after 1-2 fm/c is not complete if 4 pi eta/s is
greater or equal to 3 and should be extended to include dissipative phenomena
connected with color conductivity.


title: Continuous q-Hermite polynomials: An elementary approach

abstract:
  This overview article gives an elementary approach to continuous q-Hermite
polynomials. We stress their relation to Fibonacci, Lucas and Chebyshev
polynomials and to some q-analogues of these polynomials.


title: A program for SAXS data processing and analysis

abstract:
  A computer program for small angle X-ray scattering (SAXS) data processing
and analysis named S.exe written in Intel Visual Fortran has been developed.
This paper briefly introduces its main theory and function.


title:
Lower Bounds for the Decay of Correlations in Non-uniformly Expanding
  Maps

abstract:
  We give conditions under which nonuniformly expanding maps exhibit lower
bounds of polynomial type for the decay of correlations and for a large class
of observables. We show that if the Lasota-Yorke type inequality for the
transfer operator of a first return map are satisfied in a Banach space B, and
the absolutely continuous invariant measure obtained is weak mixing, in terms
of aperiodicity, then under some renewal condition, the maps have polynomial
decay of correlations for observables in B. We also provide some general
conditions that give aperiodicity for expanding maps in higher dimensional
spaces. As applications, we obtain lower bounds for piecewise expanding maps
with an indifferent fixed point and for which we also allow non-Markov
structure and unbounded distortion. The observables are functions that have
bounded variation or satisfy quasi-H\"older conditions and have their support
bounded away from the neutral fixed points.


title: Some identities of q-Bernoulli numbers associated p-adic convolutions

abstract:
  In this paper, we give some interesting and new identities of q-Bernoulli
numbers which are derived from convolutions on the ring of p-adic integers.


title: Dynamical degrees of birational transformations of projective surfaces

abstract:
  The dynamical degree $\lambda(f)$ of a birational transformation $f$ measures
the exponential growth rate of the degree of the formulae that define the
$n$-th iterate of $f$. We study the set of all dynamical degrees of all
birational transformations of projective surfaces, and the relationship between
the value of $\lambda(f)$ and the structure of the conjugacy class of $f$. For
instance, the set of all dynamical degrees of birational transformations of the
complex projective plane is a closed and well ordered set of algebraic numbers.


title:
Determination of exotic hadron structure by constituent-counting rule
  for hard exclusive processes

abstract:
  We propose to use hard exclusive production of an exotic hadron for finding
its internal quark-gluon configuration by the constituent-counting rule in
perturbative QCD. In particular, the cross section for the exclusive process
$\pi^- + p \to K^0 + \Lambda (1405)$ is estimated at the scattering angle
$\theta=90^\circ$ in the center-of-mass frame by using current experimental
data. In comparison, the cross section for the ground-state $\Lambda$
production $\pi^- + p \to K^0 + \Lambda$ is also shown. We suggest that the
internal quark configuration of $\Lambda (1405)$ should be determined by the
asymptotic scaling behavior of the cross section. If it is an ordinary
three-quark baryon, the scaling of the cross section is $s^{8} d\sigma
/dt=$constant, whereas it is $s^{10} d\sigma /dt=$constant if $\Lambda (1405)$
is a five-quark hadron, where $s$ and $t$ are Mandelstam variables. Such a
measurement will be possible, for example, by using the high-momentum beamline
at J-PARC. In addition, another exclusive process $\gamma + p \to K^+ + \Lambda
(1405)$ could be investigated at LEPS and JLab for finding the nature of
$\Lambda (1405)$. We indicate that the constituent-counting rule could be used
as a valuable quantity in determining internal structure of exotic hadrons by
high-energy exclusive processes, where quark-gluon degrees of freedom
explicitly appear. Furthermore, it is interesting to investigate the transition
from hadron degrees of freedom to quark-gluon ones for exclusive exotic-hadron
production processes.


title:
On complete positivity, Markovianity, and the quantum data-processing
  inequality, in the presence of initial system-environment correlations

abstract:
  We show that complete positivity is not only sufficient but also necessary
for the validity of the quantum data-processing inequality. As a consequence,
the reduced dynamics of a quantum system are completely positive, even in the
presence of initial correlations with its surrounding environment, if and only
if such correlations do not allow any anomalous backward flow of information
from the environment to the system. Our approach provides an intuitive
information-theoretic framework to unify and extend a number of previous
results.


title:
The Dijkgraaf-Witten invariants of Seifert 3-manifolds with orientable
  bases

abstract:
  We derive a formula for the Dijkgraaf-Witten invariants of orientable Seifert
3-manifolds with orientable bases.


title:
On spectral properties of a Sturm-Liouville problem with transmission
  conditions and eigenparameter dependent boundary conditions with retarded
  argument

abstract:
  In this work, we consider not only a discontinuous boundary-value problem
with retarded argument and four supplementary transmission conditions at the
two points of discontinuities but also, eigenparameter-dependent boundary
conditions and obtain asymptotic formulas for the eigenvalues and corresponding
eigenfunctions.


title: Learning directed acyclic graphs based on sparsest permutations

abstract:
  We consider the problem of learning a Bayesian network or directed acyclic
graph (DAG) model from observational data. A number of constraint-based,
score-based and hybrid algorithms have been developed for this purpose. For
constraint-based methods, statistical consistency guarantees typically rely on
the faithfulness assumption, which has been show to be restrictive especially
for graphs with cycles in the skeleton. However, there is only limited work on
consistency guarantees for score-based and hybrid algorithms and it has been
unclear whether consistency guarantees can be proven under weaker conditions
than the faithfulness assumption. In this paper, we propose the sparsest
permutation (SP) algorithm. This algorithm is based on finding the causal
ordering of the variables that yields the sparsest DAG. We prove that this new
score-based method is consistent under strictly weaker conditions than the
faithfulness assumption. We also demonstrate through simulations on small DAGs
that the SP algorithm compares favorably to the constraint-based PC and SGS
algorithms as well as the score-based Greedy Equivalence Search and hybrid
Max-Min Hill-Climbing method. In the Gaussian setting, we prove that our
algorithm boils down to finding the permutation of the variables with sparsest
Cholesky decomposition for the inverse covariance matrix. Using this
connection, we show that in the oracle setting, where the true covariance
matrix is known, the SP algorithm is in fact equivalent to $\ell_0$-penalized
maximum likelihood estimation.


title: Monolayer Spontaneous Curvature of Raft-Forming Membrane Lipids

abstract:
  Monolayer spontaneous curvatures for cholesterol, DOPE, POPE, DOPC, DPPC,
DSPC, POPC, SOPC, and egg sphingomyelin were obtained using small-angle X-ray
scattering (SAXS) on inverted hexagonal phases (HII). Spontaneous curvatures of
bilayer forming lipids were estimated by adding controlled amounts to a HII
forming template following previously established protocols. Spontanous
curvatures of both phosphatidylethanolamines and cholesterol were found to be
at least a factor of two more negative than those of phosphatidylcholines,
whose J0 are closer to zero. Interestingly, a significant positive J0 value
(+0.1 1/nm) was retrieved for DPPC at 25 {\deg}C. We further determined the
temperature dependence of the spontaneous curvatures J0(T) in the range from 15
to 55 \degC, resulting in a quite narrow distribution of -1 to -3 * 10^-3
1/nm{\deg}C for most investigated lipids. The data allowed us to estimate the
monolayer spontaneous curvatures of ternary lipid mixtures showing liquid
ordered / liquid disordered phase coexistence. We report spontaneous curvature
phase diagrams for DSPC/DOPC/Chol, DPPC/DOPC/Chol and SM/POPC/Chol and discuss
effects on protein insertion and line tension.


title: Undulatory locomotion of finite filaments: lessons from C. elegans

abstract:
  Undulatory swimming is a widespread propulsion strategy adopted by many
small-scale organisms including various single-cell eukaryotes and nematodes.
In this work, we report a comprehensive study of undulatory locomotion of a
finite filament using (i) approximate resistive force theory (RFT) assuming a
local nature of hydrodynamic interaction between the filament and the
surrounding viscous liquid, and (ii) particle-based numerical computations
taking into account the intra-filament hydrodynamic interaction. Using the
ubiquitous model of a propagating sinusoidal waveform, we identify the limit of
applicability of the RFT and determine the optimal propulsion gait in terms of
(i) swimming distance per period of undulation and (ii) hydrodynamic propulsion
efficiency. The occurrence of the optimal swimming gait maximizing hydrodynamic
efficiency at finite wavelength in particle-based computations diverges from
the prediction of the RFT. To compare the model swimmer powered by sine wave
undulations to biological undulatory swimmers, we apply the particle-based
approach to study locomotion of the model organism nematode Caenorhabditis
elegans using the swimming gait extracted from experiments. The analysis
reveals that even though the amplitude and the wavenumber of undulations are
similar to those determined for the best performing sinusoidal swimmer, C.
elegans overperforms the latter in terms of both displacement and hydrodynamic
efficiency. Further comparison with other undulatory microorganisms reveals
that many adopt waveforms with characteristics similar to the optimal model
swimmer, yet real swimmers still manage to beat the best performing sine-wave
swimmer in terms of distance covered per period. Overall our results underline
the importance of further waveform optimization, as periodic undulations
adopted by C. elegans and other organisms deviate considerably from a simple
sine wave.


title:
A somewhat gentle introduction to differential graded commutative
  algebra

abstract:
  Differential graded (DG) commutative algebra provides powerful techniques for
proving theorems about modules over commutative rings. These notes are a
somewhat colloquial introduction to these techniques. In order to provide some
motivation for commutative algebraists who are wondering about the benefits of
learning and using these techniques, we present them in the context of a recent
result of Nasseh and Sather-Wagstaff. These notes were used for the course
"Differential Graded Commutative Algebra" that was part of the Workshop on
Connections Between Algebra and Geometry held at the University of Regina, May
29--June 1, 2012.


title: Local spin relaxation within the random Heisenberg chain

abstract:
  Finite-temperature local spin dynamics within the random spin-1/2
antiferromagnetic Heisenberg chain is studied numerically. The aim is to
explain measured NMR spin-lattice relaxation times in
BaCu_{2}(Si_{0.5}Ge_{0.5})_{2}O_{7}, which is the realization of a random spin
chain. In agreement with experiments we find that the distribution of
relaxation times within the model shows a very large span similar to the
stretched-exponential form. The distribution is strongly reduced with
increasing T but stays finite also in the high-T limit. Our results reveal the
crucial role of the anisotropy (interaction), since the behavior is essentially
contrast with the ones for XX model (equivalent to noninteracting fermions),
where we do not find any significant T dependence of the distribution.


title:
Representation Growth and Rational Singularities of the Moduli Space of
  Local Systems

abstract:
  We relate the asymptotic representation theory of $SL(d,\mathbb{Z}_p)$ and
the singularities of the moduli space of $SL(d)$-local systems on a smooth
projective curve, proving new theorems about both. Regarding the former, we
prove that, for every d, the number of n-dimensional representations of
$SL(d,\mathbb{Z}_p)$ grows slower than $n^{22}$, confirming a conjecture of
Larsen and Lubotzky. Regarding the latter, we prove that the moduli space of
$SL(d)$-local systems on a smooth projective curve of genus at least 12 has
rational singularities. Most of our results apply more generally to semi-simple
algebraic groups.
  For the proof, we study the analytic properties of push forwards of smooth
measures under algebraic maps. More precisely, we show that such push forwards
have continuous density if the algebraic map is flat and all of its fibers have
rational singularities.


title: Anderson localization of a Majorana fermion

abstract:
  Isolated Majorana fermion states can be produced at the boundary of a
topological superconductor in a quasi-one-dimensional geometry. If such a
superconductor is connected to a disordered quantum wire, the Majorana fermion
is spread into the wire, subject to Anderson localization. We study this effect
in the limit of a thick wire with broken time-reversal and spin-rotational
symmetries. With the use of a supersymmetric nonlinear sigma model, we
calculate the average local density of states in the wire as a function of
energy and of the distance from the interface with the superconductor. Our
results may be qualitatively explained by the repulsion of states from the
Majorana level and by Mott hybridization of localized states.


title:
Gaussian Process Conditional Copulas with Applications to Financial Time
  Series

abstract:
  The estimation of dependencies between multiple variables is a central
problem in the analysis of financial time series. A common approach is to
express these dependencies in terms of a copula function. Typically the copula
function is assumed to be constant but this may be inaccurate when there are
covariates that could have a large influence on the dependence structure of the
data. To account for this, a Bayesian framework for the estimation of
conditional copulas is proposed. In this framework the parameters of a copula
are non-linearly related to some arbitrary conditioning variables. We evaluate
the ability of our method to predict time-varying dependencies on several
equities and currencies and observe consistent performance gains compared to
static copula models and other time-varying copula methods.


title:
Sensitivity of the squark flavor mixing to the CP violation of K, B0 and
  Bs mesons

abstract:
  We study the sensitivity of the squark flavor mixing to the CP violating
phenomena of $K$, $B^0$ and $B_s$ mesons in the framework of the split-family
scenario, where the first and second family squarks are very heavy, ${\cal
O}(10)$TeV, on the other hand, the third family squark masses are at ${\cal
O}(1)$TeV. In order to constrain the gluino-sbottom-quark mixing parameters, we
input the experimental data of the CP violations of $K$, $B^0$, and $B_s$
mesons, that is $\epsilon_K$, $\phi_d$, and $\phi_s$. The experimental upper
bound of the chromo-EDM of the strange quark is also input. In addition, we
take account of the observed values $\Delta M_{B^0}$, $\Delta M_{B_s}$, the CKM
mixing $|V_{ub}|$, and the branching ratio of $b\to s\gamma$. The allowed
region of the mixing parameters are obtained as $|\delta_{13}^{dL(dR)}|=0\sim
0.01$ and $|\delta_{23}^{dL(dR)}|=0\sim 0.04$. By using these values, the
deviations from the SM are estimated in the CP violations of the $B^0$ and
$B_s$ decays. The deviation from the SM one is tiny in the CP asymmetries of
$B^0\to \phi K_S$ and $B^0\to \eta 'K^0$ due to the chromo-EDM of the strange
quark. On the other hand, the CP asymmetries $B_s \to \phi \phi$ and $B_s \to
\phi \eta '$ could be largely deviated from the SM predictions. We also predict
the time dependent CP asymmetry of $B^0\to K^0\bar K^0$ and the semi-leptonic
CP asymmetries of $B^0 \to \mu ^-X$ and $B_s \to \mu ^-X$. We expect those
precise measurements at Belle II, which will provide us interesting tests for
the squark flavor mixing.


title: A New Paradigm in Space Based Experiments Using Rubber Balloons

abstract:
  Indian Centre for Space Physics is engaged in long duration balloon borne
experiments with typical payloads less than ~ 3kg. Low cost rubber balloons are
used. In a double balloon system, the booster balloon lifts the orbiter balloon
to its cruising altitude where data is taken for a long time. Here we present
results of muon detections and recent solar activities, including the light
curves and flare spectra in the 20-100keV range. We not only show that we have
successfully obtained several flares and there spectra at different altitudes,
we also found that the high energy X-ray flux of strong flares at altitudes of
10-13 km (the flight altitude of commercial planes) could be more than the
contribution due to cosmic rays.


title: (Non) supersymmetric quantum quenches

abstract:
  We explore supersymmetric quantum quenches of the mass and coupling constants
in the $\mathcal{N}=1$ supersymmetric vector model using Hartee-Fock
approximation. We find that in the case of the free fermionic field, quench of
the mass generates singularity localized at the instant of sudden change and we
point out the essential role of the parity of spacetime. Focusing on a
supersymmetric generalization of the $\phi^6$ model and using stationary phase
approximation, we demonstrate that supersymmetry is broken in the asymptotic
state that emerges at late times after the quench. Finally, we confirm SUSY
breaking in the time-dependent setting by integrating numerically the exact
equations of motion from the instant of the quench into asymptotic regime. We
argue that the breaking of supersymmetry cannot be attributed to the thermal
physics since to leading order in the Hartee-Fock approximation the final state
is not thermal.


title: Flat limits of curved interacting cosmic fluids

abstract:
  We study curved isotropic cosmologies filled with two interacting fluids near
their time singularities. We find that a number of these universes asymptote to
flat limits in the sense that their asymptotic properties become
indistinguishable from those of flat Friedmann-Robertson-Walker models on
approach to the singularity along any asymptotic direction. In particular,
there are no essential singularities in these models. We discuss connections of
this result with possible extensions of the cosmic no hair theorem to the case
of two interacting fluids, and also provide links to a quantum cosmological
treatment of real and complex Euclidean such solutions.


title: Pure state quantum statistical mechanics and black holes

abstract:
  Chapter 3 of S. Lloyd's 1988 Ph.D. thesis, `Black Holes, Demons, and the Loss
of Coherence: How complex systems get information and what they do with it,'
supervisor Heinz Pagels. Reformulates statistical mechanics in terms of pure
states and shows that (a) quantum statistics of typical pure states are very
close to the mechanics of statistical mechanical ensembles; (b) if a system is
in a typical state with energy E, then the reduced density matrix of a
subsystem is very close to a thermal state. (A similar result was derived using
Levy's lemma some years later by S. Popescu, A.J. Short, A.Winter, Nature
Physics 2, 754-758 (2006).) Pure state quantum statistical mechanics is applied
to black holesto show that for typical states of matter insideand outside a
black hole, the external state is likely to be thermal. Proposes novel
interpretation of probabilities in quantum statistical mechanics. Full thesis
available at http://meche.mit.edu/documents/slloyd_thesis.pdf. This chapter was
submitted for publication to Physical Review in 1988 but rejected by one
sentence referee report: `There is no physics in this paper.' You be the judge.


title: L^2-Betti numbers and Plancherel measure

abstract:
  We compute $L^2$-Betti numbers of postliminal, locally compact, unimodular
groups in terms of ordinary dimensions of reduced cohomology with coefficients
in irreducible unitary representations and the Plancherel measure. This allows
us to compute the $L^2$-Betti numbers for semi-simple Lie groups with finite
center, simple algebraic groups over local fields, and automorphism groups of
locally finite trees acting transitively on the boundary.


title: Quantum enigma machines

abstract:
  Enigma machines are devices that perform cryptography using pseudo-random
numbers. The original enigma machine code was broken by detecting hidden
patterns in these pseudo-random numbers. This paper proposes a model for a
quantum optical enigma machine and shows that the phenomenon of quantum data
locking makes such quantum enigma machines provably secure even in the presence
of noise and loss.


title: Energy transfer using unitary transformations

abstract:
  We study the unitary time evolution of a simple quantum Hamiltonian
describing two harmonic oscillators coupled via a three-level system. The
latter acts as an engine transferring energy from one oscillator to the other
and is driven in a cyclic manner by time-dependent external fields. The
S-matrix of the cycle is obtained in analytic form. The total number of quanta
contained in the system is a conserved quantity. As a consequence the spectrum
of the S-matrix is purely discrete and the evolution of the system is
quasi-periodic.


title: On the Picard group of a Delsarte surface

abstract:
  We suggest an algorithm computing, in some cases, an explicit generating set
for the N\'eron--Severi lattice of a Delsarte surface.


title: Inverse Engineering Control in Open Quantum Systems

abstract:
  We propose a scheme for inverse engineering control in open quantum systems.
Starting from an undetermined time evolution operator, a time-dependent
Hamiltonian is derived in order to guide the system to attain an arbitrary
target state at a predefined time. We analyze the fidelity of our control
protocol under noise with respect to the stochastic fluctuation of the linear
parameters of the Hamiltonian during the time evolution. For a special family
of Hamiltonians for two-level systems, we show that the control evolution of
the system under noise can be categorized into two standard decohering
processes: dephasing and depolarization, for both Markovian and non- Markovian
conditions. In particular, we illustrate our formalism by analysing the
robustness of the engineered target state.


title: Lifting the field of norms

abstract:
  Let K be a finite extension of Q_p. The field of norms of a p-adic Lie
extension K_infty/K is a local field of characteristic p which comes equipped
with an action of Gal(K_infty/K). When can we lift this action to
characteristic 0, along with a compatible Frobenius map? In this note, we
formulate precisely this question, explain its relevance to the theory of
(phi,Gamma)-modules, and give a condition for the existence of certain types of
lifts.


title:
Growth and electrical characterization of
  Al0.24Ga0.76As/AlxGa1-xAs/Al0.24Ga0.76As modulation-doped quantum wells with
  extremely low x

abstract:
  We report on the growth and electrical characterization of modulation-doped
Al0.24Ga0.76As/AlxGa1-xAs/Al0.24Ga0.76As quantum wells with mole fractions as
low as x=0.00057. Such structures will permit detailed studies of the impact of
alloy disorder in the fractional quantum Hall regime. At zero magnetic field,
we extract an alloy scattering rate of 24 ns-1 per %Al. Additionally we find
that for x as low as 0.00057 in the quantum well, alloy scattering becomes the
dominant mobility-limiting scattering mechanism in ultra-high purity
two-dimensional electron gases typically used to study the fragile nu=5/2 and
nu=12/5 fractional quantum Hall states.


title: Radio Astronomy transformed: Aperture Arrays - Past, Present and Future

abstract:
  Aperture Arrays have played a major role in radio astronomy since the field
emerged from the results of long-distance communication tests performed by Karl
Jansky in the early 1930's. The roots of this technology extend back beyond
Marconi, although the first electronically scanned instrument only appeared in
the run-up to World War II. After the war, phased arrays had a major impact in
many walks of life, including astronomy and astrophysics. Major progress was
made in understanding the nature of the radio sky, including the discovery of
Pulsars. Despite these early successes, parabolic dishes largely replaced
aperture arrays through the 1960's, and right up until the end of the 20th
century. Technological advances in areas such as signal processing, digital
electronics, low-power/high performance super-computing and large capacity data
storage systems have recently led to a substantial revival in the use of
aperture arrays - especially at frequencies below 300 MHz. Composed of simple
antennas with commercially available low-noise room-temperature amplifiers,
aperture arrays with huge collecting areas can be synthesized at relatively low
cost. Multiple beams (or multiple fields-of-view) can be rapidly formed and
electronically steered across the sky. As astronomers begin to grapple with
these new possibilities, the next goal is to see these systems move to higher
GHz frequencies. Aperture Arrays operating at frequencies of up to 1.7 GHz are
expected to form a substantial part of the Square Kilometre Array (SKA).


title:
A mixed SOC-turbulence model for nonlocal transport and space-fractional
  Fokker-Planck equation

abstract:
  The phenomena of nonlocal transport in magnetically confined plasma are
theoretically analyzed. A hybrid model is proposed, which brings together the
notion of inverse energy cascade, typical of drift-wave- and two-dimensional
fluid turbulence, and the ideas of avalanching behavior, associable with
self-organized critical (SOC) behavior. Using statistical arguments, it is
shown that an amplification mechanism is needed to introduce nonlocality into
dynamics. We obtain a consistent derivation of nonlocal Fokker-Planck equation
with space-fractional derivatives from a stochastic Markovian process with the
transition probabilities defined in reciprocal space.


title:
Detection of high-degree prograde sectoral mode sequences in the A-star
  KIC 8054146?

abstract:
  This paper examines the 46 frequencies found in the Delta Sct star KIC
8054146 involving a frequency spacing of exactly 2.814 c/d (32.57 microHz),
which is also a dominant low-frequency peak near or equal to the rotational
frequency. These 46 frequencies range up to 146 c/d. Three years of Kepler data
reveal distinct sequences of these equidistantly spaced frequencies, including
the basic sequence and side lobes associated with other dominant modes (i.e.,
small amplitude modulations). The amplitudes of the basic sequence show a
high-low pattern. The basic sequence follows the equation fm = 2.8519 + m *
2.81421 c/d with m ranging from 25 to 35. The zero-point offset and the lack of
low-order harmonics eliminate an interpretation in terms of a Fourier series of
a non-sinusoidal light curve. The exactness of the spacing eliminates
high-order asymptotic pulsation. The frequency pattern is not compatible with
simple hypotheses involving single or multiple spots, even with differential
rotation. The basic high-frequency sequence is interpreted in terms of prograde
sectoral modes. These can be marginally unstable, while their corresponding
low-degree counterparts are stable due to stronger damping. The measured
projected rotation velocity (300 km/s) indicates that the star rotates with
app. 70% of the Keplerian break-up velocity. This suggests a near equator-on
view. We qualitatively examine the visibility of prograde sectoral high-degree
g-modes in integrated photometric light in such a geometrical configuration and
find that prograde sectoral modes can reproduce the frequencies and the
odd-even amplitude pattern of the high-frequency sequence.


title: Relativistic effects on coronal ejection in variable X-ray sources

abstract:
  Optically thin coronae around neutron stars suffering an X-ray burst can be
ejected as a result of rapid increase in stellar luminosity. In general
relativity (GR), radiation pressure from the central luminous star counteracts
gravitational attraction more strongly than in Newtonian physics. However,
motion near the neutron star is very effectively impeded by the radiation
field. We discuss coronal ejection in a general relativistic calculation of the
motion of a test particle in a spherically symmetric radiation field. At every
radial distance from the star larger than that of the ISCO, and any initial
luminosity of the star, there exists a luminosity change which leads to coronal
ejection. The luminosity required to eject from the system the inner parts of
the optically thin neutron-star corona is very high in the presence of
radiation drag and always close to the Eddington luminosity. Outer parts of the
corona, at a distance of ~20 $R_G$ or more, will be ejected by a sub-Eddington
outburst. Mildly fluctuating luminosity will lead to dissipation in the plasma
and may explain the observed X-ray temperatures of coronae in low mass X-ray
binaries (LMXBs). At large radial distances from the star ($3\cdot 10^3 R_G$ or
more) the results do not depend on whether or not Poynting-Robertson drag is
included in the calculation.


title:
Conducting boron sheets formed by the reconstruction of the \alpha-boron
  (111) surface

abstract:
  Systematic ab initio structure prediction was applied for the first time to
predict low energy surface reconstructions by employing the minima hopping
method on the \alpha-boron (111) surface. Novel reconstruction geometries were
identified and carefully characterized in terms of structural and electronic
properties. Our calculations predict the formation of a planar, mono-layer
sheet at the surface, which is responsible for conductive surface states.
Furthermore, the isolated boron sheet is shown to be the ground state
2D-structure in vacuum at a hole density of \eta=1/5 and is therefore a
potential candidate as a precursor for boron nano-structures.


title: The Conceptual Design of the Magdalena Ridge Observatory Interferometer

abstract:
  We describe the scientific motivation for and conceptual design of the
Magdalena Ridge Observatory Interferometer, an imaging interferometer designed
to operate at visible and near-infrared wavelengths. The rationale for the
major technical decisions in the interferometer design is discussed, the
success of the concept is appraised, and the implications of this analysis for
the design of future arrays are drawn out.


title:
Kinetic theory and evolution of cosmological fluctuations with neutrino
  number asymmetry

abstract:
  We derive a kinetic equation for chiral matter at non-zero chemical potential
that governs the response of the parity odd part of the distribution function
to perturbations of the Robertson-Walker metric. The derivation is based on a
recent evaluation of the gravitational polarization tensor at non-zero chemical
potential. We also provide the equations for gravity waves that follow from the
anisotropic stress tensor describing the lepton asymmetry. These equations can
be used to assess the effects that a non-zero neutrino chemical potential would
have on the evolution of cosmological perturbations.


title: A note on the K\"ahler and Mori cones of hyperk\"ahler manifolds

abstract:
  In the present paper we prove that, on a hyperk\"ahler manifold, walls of the
k\"ahler cone and extremal rays of the Mori cone are determined by all divisors
satisfying certain numerical conditions.


title:
Hard exclusive production of two pions in $\gamma\gamma$-collisions
  within the SCET factorization approach

abstract:
  We considered the power corrections to the amplitude describing hard
exclusive pion pair production in gamma gamma collisions at large energy and
momentum transfer. In order to derive a factorization formula for the
subleading power corrections one has to take into account the so-called
soft-overlap (or soft) contributions. These terms can be naturally introduced
within the SCET framework as a matrix elements of the SCET-I operators. The
so-called end-point singularities must cancel in the sum of the hard and soft
contributions after matching onto SCET-II. Using the so-called physical
subtraction scheme we demonstrated such a cancellation in the case of twist-3
chiral enhanced contributions in the leading logarithmic approximation.
  As a result we obtained the well defined expression for the subleading power
correction which depends only from the two unknown functions. These functions
can be associated with the soft-overlap of the outgoing pion state and
therefore does not depend on the scattering angle. The angular dependence in
this case is defined by the hard subprocess and can be computed in a model
independent way.
  The obtained results were used in the phenomenological analysis of existing
data. We showed that using the leading and subleading contributions and
considering the unknown functions as a free parameters one can describe
consistently the data for $\pi^{+}\pi^{-}$ and $\pi^{0}\pi^{0}$ production.


title: Phenomenology of Current-Induced Spin-Orbit Torques

abstract:
  Currents induce magnetization torques via spin-transfer when the spin angular
momentum is conserved or via relativistic spin-orbit coupling. Beyond simple
models, the relationship between material properties and spin-orbit torques is
not known. Here, we present a novel phenomenology of current-induced torques
that is valid for any strength of intrinsic spin-orbit coupling. In $\rm
Pt|Co|AlO_x$, we demonstrate that the domain walls move in response to a novel
relativistic dissipative torque that is dependent on the domain wall structure
and that can be controlled via the Dzyaloshinskii-Moriya interaction. Unlike
the non-relativistic spin-transfer torque, the new torque can, together with
the spin-Hall effect in the Pt-layer, move domain walls by means of electric
currents parallel to the walls.


title: On Optimal Zero-Delay Coding of Vector Markov Sources

abstract:
  Optimal zero-delay coding (quantization) of a vector-valued Markov source
driven by a noise process is considered. Using a stochastic control problem
formulation, the existence and structure of optimal quantization policies are
studied. For a finite-horizon problem with bounded per-stage distortion
measure, the existence of an optimal zero-delay quantization policy is shown
provided that the quantizers allowed are ones with convex codecells. The
bounded distortion assumption is relaxed to cover cases that include the linear
quadratic Gaussian problem. For the infinite horizon problem and a stationary
Markov source the optimality of deterministic Markov coding policies is shown.
The existence of optimal stationary Markov quantization policies is also shown
provided randomization that is shared by the encoder and the decoder is
allowed.


title: Neutron Stars and the EOS

abstract:
  Implications of recently well-measured neutron star masses, particularly near
and above 2 solar masses, for the equation of state (EOS) of neutron star
matter are highlighted. Model-independent upper limits to thermodynamic
properties in neutron stars, which only depend on the neutron star maximum
mass, established from causality considerations are presented. The need for
non-perturbative treatments of quark matter in neutron stars is stressed
through studies of self-bound quark matter stars, and of nucleon-quark hybrid
stars. The extent to which several well-measured masses and radii of individual
neutron stars can establish a model-independent EOS through an inversion of the
stellar structure equations is briefly discussed.


title: Prescribin the binary digits of the primes, II

abstract:
  We obtain the expected asymptotic formula for the number of primes $p<N=2^n$
with $r$ prescribed (arbitrarly placed) binary digits, provided $r<cn$ for a
suitable constant $c>0$. This result improves on our earlier result where $r$
was assumed to satisfy $r<c(\frac n{\log n})^{4/7}$.


title:
Solutions to homogeneous Monge-Amp\`ere equations of homothetic
  functions and their applications to production models in economics

abstract:
  Mathematically, a homothetic function is a function of the form $f({\bf
x})=F(h(x_1,...,x_n))$, where $h$ is a homogeneous function of any degree $d\ne
0$ and $F$ is a monotonically increasing function. In economics homothetic
functions are production functions whose marginal technical rate of
substitution is homogeneous of degree zero.
  In this paper we classify homothetic functions satisfying the homogeneous
Monge-Amp\`ere equation. Several applications to production models in economics
will also be given.


title:
Nuclear Level Densities at High Excitation Energies and for Large
  Particle Numbers

abstract:
  Starting from an independent-particle model with a finite and arbitrary set
of single-particle energies, we develop an analytical approximation to the
many-body level density $\rho_A(E)$ and to particle-hole densities. We use
exact expressions for the low-order moments and cumulants to derive approximate
expressions for the coefficients of an expansion of these densities in terms of
orthogonal polynomials. The approach is asymptotically (mass number $A \gg 1$)
convergent and, for large $A$, covers about 20 orders of magnitude near the
maximum of $\rho_A(E)$ (i.e., about half the spectrum). Densities of accessible
states are calculated using the Fermi-gas model.


title: Quantum principal component analysis

abstract:
  The usual way to reveal properties of an unknown quantum state, given many
copies of a system in that state, is to perform measurements of different
observables and to analyze the measurement results statistically. Here we show
that the unknown quantum state can play an active role in its own analysis. In
particular, given multiple copies of a quantum system with density matrix \rho,
then it is possible to perform the unitary transformation e^{-i\rho t}. As a
result, one can create quantum coherence among different copies of the system
to perform quantum principal component analysis, revealing the eigenvectors
corresponding to the large eigenvalues of the unknown state in time
exponentially faster than any existing algorithm.


title: The Schur problem and block operator CMV matrices

abstract:
  The CMV matrices and their sub-matrices are applied to the description of all
solutions to the Schur interpolation problem for contractive analytic
operator-valued functions in the unit disk (the Schur class functions).


title: An outburst scenario for the X-ray spectral variability in 3C 111

abstract:
  We present a combined Suzaku and Swift BAT broad-band E=0.6-200keV spectral
analysis of three 3C 111 observations obtained in 2010. The data are well
described with an absorbed power-law continuum and a weak (R~0.2) cold
reflection component from distant material. We constrain the continuum cutoff
at E_c~150-200keV, which is in accordance with X-ray Comptonization corona
models and supports claims that the jet emission is only dominant at much
higher energies. Fe XXVI Ly\alpha emission and absorption lines are also
present in the first and second observations, respectively. The modelling and
interpretation of the emission line is complex and we explore three
possibilities. If originating from ionized disc reflection, this should be
emitted at r_in> 50r_g or, in the lamp-post configuration, the illuminating
source should be at a height of h> 30r_g over the black hole. Alternatively,
the line could be modeled with a hot collisionally ionized plasma with
temperature kT = 22.0^{+6.1}_{-3.2} keV or a photo-ionized plasma with
log\xi=4.52^{+0.10}_{-0.16} erg s^{-1} cm and column density N_H > 3x10^23
cm^{-2}. However, the first and second scenarios are less favored on
statistical and physical grounds, respectively. The blue-shifted absorption
line in the second observation can be modelled as an ultra-fast outflow (UFO)
with ionization parameter log\xi=4.47^{+0.76}_{-0.04} erg s^{-1} cm, column
density N_H=(5.3^{+1.8}_{-1.3})x 10^{22} cm^{-2} and outflow velocity v_out =
0.104+/-0.006 c. Interestingly, the parameters of the photo-ionized emission
model remarkably match those of the absorbing UFO. We suggest an outburst
scenario in which an accretion disc wind, initially lying out of the line of
sight and observed in emission, then crosses our view to the source and it is
observed in absorption as a mildly-relativistic UFO.


title:
Relativistic effects on the hyperfine structures of 2p4(3P)3p 2Do, 4Do
  and 4Po in 19F I

abstract:
  The hyperfine interaction constants of the 2p4(3P)3p 2Do_{3/2,5/2},
4Do_{1/2-7/2} and 4Po_{1/2-5/2} levels in neutral fluorine are investigated
theoretically. Large-scale calculations are carried out using the
multiconfiguration Hartree-Fock (MCHF) and Dirac-Hartree-Fock (MCDHF) methods.
In the framework of the MCHF approach, the relativistic effects are taken into
account in the Breit-Pauli approximation using non relativistic orbitals. In
the fully relativistic approach, the orbitals are optimized using the
Dirac-Coulomb Hamiltonian with correlation models inspired by the non
relativistic calculations. Higher-order excitations are captured through
multireference configuration interaction calculations including the Breit
interaction. In a third (intermediate) approach, the Dirac-Coulomb-Breit
Hamiltonian matrix is diagonalized in a relativistic configuration space built
with non relativistic MCHF radial functions converted into Dirac spinors using
the Pauli approximation. The magnetic dipole hyperfine structure constants
calculated with the three relativistic models are consistent and reveal
unexpectedly large effects of relativity for 2Do_{5/2}, 4Po_{3/2} and
4Po_{5/2}. The agreement with the few available experimental values is
satisfactory. The strong J-dependence of relativistic corrections on the
hyperfine constants is investigated through the detailed analysis of the
orbital, spin-dipole and contact relative contributions calculated with the non
relativistic magnetic dipole operator.


title: Operations on derived moduli spaces of branes

abstract:
  The main theme of this work is the study of the operations that naturally
exist on moduli spaces of maps $Map(S,X)$, also called the space of branes of
$X$ with respect $S$. These operations will be constructed as operations on the
(quasi-coherent) derived category $\D(Map(S,X))$, in the particular case where
$S$ has some close relations with an operad $\OO$. More precisely, for an
$\s$-operad $\OO$ and an algebraic variety $X$ (or more generally a derived
algebraic stack), satisfying some natural conditions, we prove that $\OO$ acts
on the object $\OO(2)$ by mean cospans. This universal action is used to prove
that $\OO$ acts on the derived category of the space of maps $Map(\OO(2),X)$,
which will call the brane operations. We apply the existence of these
operations, as well as their naturality in $\OO$, in order to propose a sketch
for a proof of the \emph{higher formality conjecture}, a far reaching extension
of Konstevich's formality's theorem. By doing so we present a positive answer
to a conjecture of Kapustin (see \cite[p. 14]{kap}), relating polyvector fields
on a variety $X$ and deformations of the mono/"i dal derived category $\D(X)$.


title: Corrections to Laser Electron Thomson Scattering

abstract:
  We discuss classical and quantum corrections to Thomson scattering between an
electron and a laser. For radiation reaction, nonlinear, and quantum effects we
identify characteristic dimensionless parameters in terms of which we determine
the leading order correction terms.


title:
Boosted $hh \rightarrow b\bar{b}b\bar{b}$: a new topology in searches
  for TeV-scale resonances at the LHC

abstract:
  It is widely believed that fully hadronic final states are not competitive in
searches for new physics at the Large Hadron Collider due to the overwhelming
QCD backgrounds. In this letter, we present a particle-level study of the
topology arising when a TeV-scale resonance decays to two Higgs bosons and
these subsequently decay to $b\bar{b}$, leading to two back-to-back boosted
dijet systems. We show that selecting events with this topology dramatically
reduces all backgrounds, thus enabling very competitive searches for new
physics in a variety of models. For a resonance with mass 1 TeV and width
around 60 GeV, we find that ATLAS or CMS could have a sensitivity to a $\sigma
\times BR$ as small as a few fb with the LHC data collected in 2012. These
conclusions are also relevant to the boosted $Zh\rightarrow b\bar{b}b\bar{b}$
and $ZZ\rightarrow b\bar{b}b\bar{b}$ final states, which would further increase
the potential sensitivity to new physics as well as to Standard Model processes
like longitudinal vector boson scattering.


title:
Polymeric Frameworks as Organic Semiconductors with Controlled
  Electronic Properties

abstract:
  The rational assembly of monomers, in principle, enables the design of a
specific periodicity of polymeric frameworks, leading to a tailored set of
electronic structure properties in these solid-state materials. The further
development of these emerging systems requires a combination of both
experimental and theoretical studies. Here, we investigated the electronic
structures of two-dimensional polymeric frameworks based on triazine and
benzene rings, by means of electrochemical techniques. The experimental density
of states was obtained from quasi-open-circuit voltage measurements through
galvanostatic intermittent titration technique, which we show to be in
excellent agreement with first principles calculations performed for two and
three-dimensional structures of these polymeric frameworks. These findings
suggest that the electronic properties do not only depend on the number of
stacked layers but also on the ratio of the different aromatic rings.


title:
Observed Asymptotic Differences in Energies of Stable and Minimal Point
  Configurations on $\mathbb{S}^2$ and the Role of Defects

abstract:
  Observations suggest that configurations of points on a sphere that are
stable with respect to a Riesz potential distribute points uniformly over the
sphere. Further, these stable configurations have a local structure that is
largely hexagonal. Minimal configurations differ from stable configurations in
the arrangement of defects within the hexagonal structure. This paper reports
the asymptotic difference between the average energy of stable states and the
lowest reported energies. We use this to infer the energy scale at which
defects in the hexagonal structure are manifest. We report results for the
Riesz potentials for s=0, s=1, s=2 and s=3. Additionally we compare existing
theory for the asymptotic expansion in N of the minimal $N$-point energy with
experimental results. We report a case of two distinct stable states that have
the same Voronoi structure. Finally, we report the observed growth of the
number of stable states as a function of N.


title: Elastic Properties and Line Tension of Self-Assembled Bilayer Membranes

abstract:
  The elastic properties of a self-assembled bilayer membrane are studied using
the self-consistent field theory, applied to a model system composed of
flexible amphiphilic chains dissolved in hydrophilic polymeric solvents.
Examining the free energy of bilayer membranes with different geometries allows
us to calculate their bending modulus, Gaussian modulus, two fourth-order
membrane moduli, and the line tension. The dependence of these parameters on
the microscopic characteristics of the amphiphilic chain, characterized by the
volume fraction of the hydrophilic component, is systematically studied. The
theoretical predictions are compared with the results from a simple monolayer
model, which approximates a bilayer membrane by two monolayers. Finally the
region of validity of the linear elasticity theory is analyzed by examining the
higher-order contributions.


title: Quantum algorithms for supervised and unsupervised machine learning

abstract:
  Machine-learning tasks frequently involve problems of manipulating and
classifying large numbers of vectors in high-dimensional spaces. Classical
algorithms for solving such problems typically take time polynomial in the
number of vectors and the dimension of the space. Quantum computers are good at
manipulating high-dimensional vectors in large tensor product spaces. This
paper provides supervised and unsupervised quantum machine learning algorithms
for cluster assignment and cluster finding. Quantum machine learning can take
time logarithmic in both the number of vectors and their dimension, an
exponential speed-up over classical algorithms.


title: Characterizing and Predicting the Robustness of Power-law Networks

abstract:
  Power-law networks such as the Internet, terrorist cells, species
relationships, and cellular metabolic interactions are susceptible to node
failures, yet maintaining network connectivity is essential for network
functionality. Disconnection of the network leads to fragmentation and, in some
cases, collapse of the underlying system. However, the influences of the
topology of networks on their ability to withstand node failures are poorly
understood. Based on a study of the response of 2,000 power-law networks to
node failures, we find that networks with higher nodal degree and clustering
coefficient, lower betweenness centrality, and lower variability in path length
and clustering coefficient maintain their cohesion better during such events.
We also find that network robustness, i.e., the ability to withstand node
failures, can be accurately predicted a priori for power-law networks across
many fields. These results provide a basis for designing new, more robust
networks, improving the robustness of existing networks such as the Internet
and cellular metabolic pathways, and efficiently degrading networks such as
terrorist cells.


title: On higher spin realizations of K(E10)

abstract:
  Starting from the known unfaithful spinorial representations of the compact
subalgebra K(E10) of the split real hyperbolic Kac-Moody algebra E10 we
construct new fermionic `higher spin' representations of this algebra (for
`spin-5/2' and `spin-7/2', respectively) in a second quantized framework. Our
construction is based on a simplified realization of K(E10) on the Dirac and
the vector spinor representations in terms of the associated roots, and on a
re-definition of the vector spinor first introduced by Damour and Hillmann. The
latter replaces manifestly SO(10) covariant expressions by new expressions that
are covariant w.r.t. SO(1,9), the invariance group of the DeWitt metric
restricted to the space of scale factors. We present explicit expressions for
all K(E10) elements that are associated to real roots of the hyperbolic algebra
(of which there are infinitely many), as well as novel explicit realizations of
the generators associated to imaginary roots and their multiplicities. We also
discuss the resulting realizations of the Weyl group.


title:
Challenges in Representation Learning: A report on three machine
  learning contests

abstract:
  The ICML 2013 Workshop on Challenges in Representation Learning focused on
three challenges: the black box learning challenge, the facial expression
recognition challenge, and the multimodal learning challenge. We describe the
datasets created for these challenges and summarize the results of the
competitions. We provide suggestions for organizers of future challenges and
some comments on what kind of knowledge can be gained from machine learning
competitions.


title:
Electronic fine structure in the nickel carbide superconductor
  Th$_{2}$NiC$_{2}$

abstract:
  The recently reported nickel carbide superconductor, body centered tetragonal
$I4/mmm$ Th$_2$NiC$_2$ with T$_c$ = 8.5 K increasing to 11.2 K upon alloying Th
with Sc, is found to have very fine structure in its electronic spectrum,
according to density functional based first principles calculations. The filled
Ni 3d band complex is hybridized with C $2p$ and Th character to and through
the Fermi level ($E_f$), and a sharply structured density of states arises only
when spin-orbit coupling is included, which splits a zone-center degeneracy
leaving a very flat band edge lying at the Fermi level. The flat part of the
band corresponds to an effective mass $m^*_{z} \rightarrow \infty$ with large
and negative $m^*_{x}=m^*_{y}$. Although the region over which the effective
mass characterization applies is less than 1% of the zone volume, it yet
supplies of the order of half the states at (or just above) the Fermi level.
The observed increase of T$_c$ by hole-doping is accounted for if the reference
as-synthesized sample is minutely hole-doped, which decreases the Fermi level
density of states and will provide some stabilization. In this scenario,
electron doping will increase the Fermi level density of states and the
superconducting critical temperature. Vibrational properties are presented, and
enough coupling to the C-Ni-C stretch mode at 70 meV is obtained to imply that
superconductivity is electron-phonon mediated.


title:
Transmission spectrum of Earth as a transiting exoplanet - from the
  ultraviolet to the near-infrared

abstract:
  Transmission spectroscopy of exoplanets is a tool to characterize rocky
planets and explore their habitability. Using the Earth itself as a proxy, we
model the atmospheric cross section as a function of wavelength, and show the
effect of each atmospheric species, Rayleigh scattering and refraction from 115
to 1000nm. Clouds do not significantly affect this picture because refraction
prevents the lowest 12.75km of the atmosphere, in a transiting geometry for an
Earth-Sun analog, to be sampled by a distant observer. We calculate the
effective planetary radius for the primary eclipse spectrum of an Earth-like
exoplanet around a Sun-like star. Below 200nm, ultraviolet(UV) O_2 absorption
increases the effective planetary radius by about 180km, versus 27km at
760.3nm, and 14km in the near-infrared (NIR) due predominantly to refraction.
This translates into a 2.6% change in effective planetary radius over the
UV-NIR wavelength range, showing that the ultraviolet is an interesting
wavelength range for future space missions.


title: Epistemic Updates on Algebras

abstract:
  We develop the mathematical theory of epistemic updates with the tools of
duality theory. We focus on the Logic of Epistemic Actions and Knowledge (EAK),
introduced by Baltag-Moss- Solecki, without the common knowledge operator. We
dually characterize the product update construction of EAK as a certain
construction transforming the complex algebras associated with the given model
into the complex algebra associated with the updated model. This dual
characterization naturally generalizes to much wider classes of algebras, which
include, but are not limited to, arbitrary BAOs and arbitrary modal expansions
of Heyting algebras (HAOs). As an application of this dual characterization, we
axiomatize the intuitionistic analogue of the logic of epistemic knowledge and
actions, which we refer to as IEAK, prove soundness and completeness of IEAK
w.r.t. both algebraic and relational models, and illustrate how IEAK encodes
the reasoning of agents in a concrete epistemic scenario.


title: Exploding Core-Collapse Supernovae by Jets-Driven Feedback Mechanism

abstract:
  We study the flow structure in the jittering-jets explosion model of
core-collapse supernovae (CCSNe) using 2.5D hydrodynamical simulations and find
that some basic requirements for explosion are met by the flow. In the
jittering-jets model jets are launched by intermittent accretion disk around
the newly born neutron star and in stochastic directions. They deposit their
kinetic energy inside the collapsing core and induce explosion by ejecting the
outer core. The accretion and launching of jets is operated by a feedback
mechanism: when the jets manage to eject the core, the accretion stops. We find
that even when the jets' directions are varied around the symmetry axis they
inflate hot bubbles that manage to expel gas in all directions. We also find
that although most of the ambient core gas is ejected outward, sufficient mass
to power the jets is accreted (0.1Mo), mainly from the equatorial plane
direction. This is compatible with the jittering jets explosion mechanism being
a feedback mechanism.


title: Searching for variable stars in the VVV globular clusters

abstract:
  The VVV is currently surveying the central regions of the Milky Way at
near-infrared wavelengths, including 36 known Galactic globular clusters. We
already have data in several filters to generate their color-magnitude
diagrams. We also have enough epochs to begin producing the light-curves of the
cluster stars and look for any possible member variable stars. We are
especially interested in RR Lyrae stars, since they are abundant in Galactic
globular clusters, and the period-luminosity relation they show at
near-infrared wavelengths, can help enormously in providing accurate distances
and reddenings for the most extincted and poorly studied inner Galactic
globular clusters. We center our attention here in the preliminary analysis of
three of these clusters: NGC 6441, Terzan 10 and 2MASS-GC02.


title:
Elliptic curves of high rank and the Riemann zeta function on the one
  line

abstract:
  We describe some experiments that show a connection between elliptic curves
of high rank and the Riemann zeta function on the one line. We also discuss a
couple of statistics involving $L$-functions where the zeta function on the one
line plays a prominent role.


title: A method to extract pure Raman spectrum of epitaxial graphene on SiC

abstract:
  A method is proposed to extract pure Raman spectrum of epitaxial graphene on
SiC by using a Non-negative Matrix Factorization. It overcomes problems of
negative spectral intensity and poorly resolved spectra resulting from a simple
subtraction of a SiC background from the experimental data. We also show that
the method is similar to deconvolution, for spectra composed of multiple sub-
micrometer areas, with the advantage that no prior information on the impulse
response functions is needed. We have used this property to characterize the
Raman laser beam. The method capability in efficient data smoothing is also
demonstrated.


title:
Phonon structure in dispersion curves and density of states of massive
  Dirac Fermions

abstract:
  Dirac fermions exist in many solid state systems including graphene, silicene
and other two dimensional membranes such as are found in group VI
dichalcogenides, as well as on the surface of some insulators where such states
are protected by topology. Coupling of those fermions to phonons introduces new
structures in their dispersion curves and, in the case of massive Dirac
fermions, can shift and modify the gap. We show how these changes present in
angular-resolved photoemission spectroscopy of the dressed charge carrier
dispersion curves and scanning tunneling microscopy measurements of their
density of states. In particular we focus on the region around the band gap. In
this region the charge carrier spectral density no longer consists of a
dominant quasiparticle peak and a smaller incoherent phonon related background.
The quasiparticle picture has broken down and this leads to important
modification in both dispersion curves and density of states.


title:
Singularities of mean curvature flow and isoperimetric inequalities in
  H^3

abstract:
  In this article, by following the method in \cite{PT}, combining Willmore
energy with isoperimetric inequalities, we construct two examples of
singularities under mean curvature flow in $\mathbb{H}^3$. More precisely,
there exists a torus, which must develop a singularity under MCF before the
volume it encloses decreases to zero. There also exists a topological sphere in
the shape of a dumbbell, which must develop a singularity in the flow before
its area shrinks to zero. Simultaneously, by using the flow, we proved an
isoperimetric inequality for some domains in $\mathbb{H}^3$.


title: Carleson measures on planar sets

abstract:
  In this paper, we investigate what are Carleson measures on open subsets in
the complex plane. A circular domain is a connected open subset whose boundary
consists of finitely many disjoint circles. We call a domain $G$ multi-nicely
connected if there exists a circular domain $W$ and a conformal map $\psi$ from
$W$ onto $G$ such that $\psi$ is almost univalent with respect the arclength on
$\partial W$. We characterize all Carleson measures for those open subsets so
that each of their components is multi-nicely connected and harmonic measures
of the components are mutually singular. Our results suggest the extend of
Carleson measures probably is up to this class of open subsets.


title:
Direct and converse magnetoelectric effects in Metglas/LiNbO3/Metglas
  trilayers

abstract:
  Electromechanical and magnetoelectric properties of Metglas/LiNbO3/Metglas
trilayers have been studied in the frequency range from 20 Hz to 0.4 MHz. A
trilayer of Metglas/PMN-PT/Metglas prepared in the same way was used as a
reference. Though PMN-PT has much larger charge piezocoefficients than LiNbO3
(LNO), the direct magnetoelectric voltage coefficient is found to be comparable
in both trilayers due to the much lower dielectric permittivity of LNO. The
magnitude of the direct magnetoelectric effect in the LNO trilayers is about
0.4 V/cm*Oe in the quasistatic regime and about 90 V/cm*Oe at electromechanical
resonance. Calculations show that the magnetoelectric properties can be
significantly improved (up to 500 V/cm*Oe) via controlling the cut angle of
LNO, choosing the appropriate thickness ratio of the
ferroelectric/ferromagnetic layers, and a better bonding between Metglas and
LNO. Advantages of using LiNbO3-type ferroelectrics in magnetoelectric
composites are discussed.


title:
An Empirical Study into Annotator Agreement, Ground Truth Estimation,
  and Algorithm Evaluation

abstract:
  Although agreement between annotators has been studied in the past from a
statistical viewpoint, little work has attempted to quantify the extent to
which this phenomenon affects the evaluation of computer vision (CV) object
detection algorithms. Many researchers utilise ground truth (GT) in experiments
and more often than not this GT is derived from one annotator's opinion. How
does the difference in opinion affect an algorithm's evaluation? Four examples
of typical CV problems are chosen, and a methodology is applied to each to
quantify the inter-annotator variance and to offer insight into the mechanisms
behind agreement and the use of GT. It is found that when detecting linear
objects annotator agreement is very low. The agreement in object position,
linear or otherwise, can be partially explained through basic image properties.
Automatic object detectors are compared to annotator agreement and it is found
that a clear relationship exists. Several methods for calculating GTs from a
number of annotations are applied and the resulting differences in the
performance of the object detectors are quantified. It is found that the rank
of a detector is highly dependent upon the method used to form the GT. It is
also found that although the STAPLE and LSML GT estimation methods appear to
represent the mean of the performance measured using the individual
annotations, when there are few annotations, or there is a large variance in
them, these estimates tend to degrade. Furthermore, one of the most commonly
adopted annotation combination methods--consensus voting--accentuates more
obvious features, which results in an overestimation of the algorithm's
performance. Finally, it is concluded that in some datasets it may not be
possible to state with any confidence that one algorithm outperforms another
when evaluating upon one GT and a method for calculating confidence bounds is
discussed.


title:
Formation of isolated islands by size-selected copper nanocluster
  deposition

abstract:
  Deposition of size-selected metal nanoclusters on a substrate with very low
kinetic energy helps to keep the clusters intact with respect to their shape
and size as compared to clusters in ight condition. Here we report formation of
isolated monodispersed islands of copper of desired size on carbon film by
deposition of size selected copper clusters (~ 3 nm) in soft-landing method.
Copper clusters were produced by a magnetron based gas aggregation type source
equipped with a quardrupole mass filter (QMF) to select size of clusters before
landing. Transmission Electron Microscopy (TEM) study shows that diffusion of
islands is very low.


title: Composite-particle hydrodynamics from dyonic black branes

abstract:
  We construct effective hydrodynamics for composite particles in (2+1)
dimensions carrying a magnetic flux by employing a holographic approach. The
hydrodynamics is obtained by perturbation of the dyonic black brane solutions
in the derivative expansion. We introduce a consistent way to avoid mixing of
different orders in the expansion. Thanks to this method, it is possible to
take the strong external magnetic field limit in the dual field theory. To
compare our result with those for a composite particle system, we study several
cases that correspond to special solutions of Einstein's equation and Maxwell's
equations.


title:
First Results from the CARIBU Facility: Mass Measurements on the
  r-Process Path

abstract:
  The Canadian Penning Trap mass spectrometer has made mass measurements of 33
neutron-rich nuclides provided by the new Californium Rare Isotope Breeder
Upgrade (CARIBU) facility at Argonne National Laboratory. The studied region
includes the 132Sn double shell closure and ranges in Z from In to Cs, with Sn
isotopes measured out to A = 135, and the typical measurement precision is at
the 100 ppb level or better. The region encompasses a possible major waiting
point of the astrophysical r process, and the impact of the masses on the r
process is shown through a series of simulations. These first-ever simulations
with direct mass information on this waiting point show significant increases
in waiting time at Sn and Sb in comparison with commonly used mass models,
demonstrating the inadequacy of existing models for accurate r-process
calculations.


title:
Submanifolds with parallel mean curvature vector in Riemannian and
  indefinite space forms

abstract:
  A submanifold of a pseudo-Riemannian manifold is said to have parallel mean
curvature vector if the mean curvature vector field H is parallel as a section
of the normal bundle. Submanifolds with parallel mean curvature vector are
important since they are critical points of some natural functionals.
  In this paper, we survey some classical and recent results on submanifolds
with parallel mean curvature vector. Special attention is paid to the
classification of space-like and Lorentz surfaces with parallel mean curvature
vector in Riemannian and indefinite space forms.


title: Manipulation of a continuous beam of molecules by light pulses

abstract:
  We experimentally observe the action of multiple light pulses on the
transverse motion of a continuous beam of fullerenes. The light potential is
generated by non-resonant ultra-short laser pulses in perpendicular spatial
overlap with the molecule beam. We observe a small but clear enhancement of the
number of molecules in the center fraction of the molecular beam. Relatively
low light intensity and short laser pulse duration prevent the molecule from
fragmentation and ionization. Experimental results are confirmed by Monte Carlo
trajectory simulations.


title:
Measurement of the plasma astrophysical S factor for the 3He(D, p)4He
  reaction in exploding molecular clusters

abstract:
  The plasma astrophysical S factor for the 3He(D, p)4He fusion reaction was
measured for the first time at temperatures of few keV, using the interaction
of intense ultrafast laser pulses with molecular deuterium clusters mixed with
3He atoms. Different proportions of D2 and 3He or CD4 and 3He were mixed in the
gas jet target in order to allow the measurement of the cross-section for the
3He(D, p)4He reaction. The yield of 14.7 MeV protons from the 3He(D, p)4He
reaction was measured in order to extract the astrophysical S factor at low
energies. Our result is in agreement with other S factor parameterizations
found in the literature.


title:
'Mutual Watch-dog Networking': Distributed Awareness of Faults and
  Critical Events in Petascale/Exascale systems

abstract:
  Many tile systems require techniques to be applied to increase components
resilience and control the FIT (Failures In Time) rate. When scaling to peta-
exa-scale systems the FIT rate may become unacceptable due to component
numerosity, requiring more systemic countermeasures. Thus, the ability to be
fault aware, i.e. to detect and collect information about fault and critical
events, is a necessary feature that large scale distributed architectures must
provide in order to apply systemic fault tolerance techniques. In this context,
the LO|FA|MO approach is a way to obtain systemic fault awareness, by
implementing a mutual watchdog mechanism and guaranteeing fault detection in a
no-single-point-of-failure fashion. This document contains specification and
implementation details about this approach, in the shape of a technical report.


title: Langevin dynamics neglecting detailed balance condition

abstract:
  An improved method for driving a system into a desired distribution, for
example, the Gibbs-Boltzmann distribution, is proposed, which makes use of an
artificial relaxation process. The standard techniques for achieving the
Gibbs-Boltzmann distribution involve numerical simulations under the detailed
balance condition. In contrast, in the present study we formulate the Langevin
dynamics, for which the corresponding Fokker-Planck operator includes an
asymmetric component violating the detailed balance condition. This leads to
shifts in the eigenvalues and results in the acceleration of the relaxation
toward the steady state. The numerical implementation demonstrates faster
convergence and shorter correlation time, and the technique of biased event
sampling, Nemoto-Sasa theory, further highlights the efficacy of our method.


title: On the Locality Principle Keeping in Aharonov-Bohm Effect

abstract:
  The locality principle fulfillment in the Aharonov-Bohm (AB) effect is
analyzed from the point of view of a self-sufficient potential formalism based
on so-called gradient hypothesis in electrodynamics. The "magnetic" kind of AB
effect is examined (as the quantum charged particle moves to an infinitely long
solenoid with a permanent current), and no locality principle violation
recognized if the gradient hypothesis is used. A conclusion is made that AB
effect is no longer a physical and electrodynamic "paradox".


title:
Lifshitz transitions and quasiparticle de-renormalization in
  YbRh$_2$Si$_2$

abstract:
  We study the effect of magnetic fields up to 15 T on the heavy fermion state
of YbRh$_2$Si$_2$ via Hall effect and magnetoresistance measurements down to 50
mK. Our data show anomalies at three different characteristic fields. We
compare our data to renormalized band structure calculations through which we
identify Lifshitz transitions associated with the heavy fermion bands. The Hall
measurements indicate that the de-renormalization of the quasiparticles, {\it
i.e} the destruction of the local Kondo singlets, occurs smoothly while the
Lifshitz transitions occur within rather confined regions of the magnetic
field.


title:
Radiatively driven Rayleigh-Taylor instability candidates around a
  forming massive star system: NACO adaptive optics and VISIR study of
  G333.6-0.2

abstract:
  The formation of the highest mass stars are thought to be dominated by
instabilities resulting from gravitation and radiation. Instabilities due to
gravitation are commonly demonstrated by observations of fragmentation, but
those due to effects of radiation have thus far not been found. Here I report
on the NACO adaptive optics and mid-infrared diffraction-limited VISIR imaging
data of an extemely luminous ultra-compact HII region G333.6-0.2. Two infrared
sources, one bright in the near-infrared(appearing point-like) and another in
the mid-infrared (resolved with an elliptical shape) are uncovered through this
data, which are located at the heart of this region. These infrared sources
appear to be embedded in the waist of a bipolar-shaped nebula and UCHII region,
the lobes of which are separated by a dark patch. Dense filamentary features
with finger/hook morphology are found; they appear to be connected to the two
bright infrared sources and the sizes of these hook features are sharply
limited to <5000 AU. The observed properties of this target and a large amount
of previous data obtained from the literature are compared together with the
results of various numerical simulations of high-mass star formation. This
comparison favours the interpretation that the finger/hook-like structures
likely represent radiatively driven Rayleigh-Taylor instabilities arising in
the outflow cavity of a forming high-mass binary star system.


title: Thermal electronic excitations in liquid metals

abstract:
  Thermal electronic excitations in metal crystals are calculated by starting
with a reference structure for the nuclei: the crystal structure of the
appropriate phase. Here we explain the corresponding theory for metal liquids,
starting with an appropriate reference structure for a liquid. We explain the
significance of these structures, and we briefly review how to find them and
calculate their properties. Then we examine the electronic densities of states
for liquid structures of Na, Al, and Cu, comparing them to their crystal forms.
Next we explain how to calculate the dominant electronic thermal excitation
term, considering issues of accuracy that do not arise in the crystal theory.
Finally we briefly discuss the contribution from the interaction between
excited electrons and moving nuclei.


title: The Riemann Mapping Problem

abstract:
  In this article we investigate the century-old continuous extension problem
of the Riemann map. Let $G$ be a simply connected domain. We call $\lambda$ in
$\partial G$ a multiple point if there are simply connected subdomains $ U$ and
$V$ such that $\lambda \in\partial U \cap\partial V$ and $ dist (\partial U\cap
G , \partial V\cap G )>0$. We show that the Riemann map of $G$ has a continuous
extension to $\overline G$ if and only if $\partial G$has no multiple points.
All of the results in this paper, together with the Riemann mapping theorem,
give a complete and desirable solution to the mapping problem that was
originally raised by Riemann in 1851 and intensively investigated by many
famous mathematicians throughout history.


title: Vibrations in jammed solids: Beyond linear response

abstract:
  We propose a `phase diagram' for particulate systems that interact via purely
repulsive contact forces, such as granular media and colloidal suspensions. We
identify and characterize two distinct classes of behavior as a function of the
input kinetic energy per degree of freedom $T_0$ and packing fraction deviation
above and below jamming onset $\Delta \phi=\phi - \phi_J$ using numerical
simulations of purely repulsive frictionless disks. Iso-coordinated solids
(ICS) only occur above jamming for $\Delta \phi > \Delta \phi_c(T_0)$; they
possess average coordination number equal to the isostatic value ($< z> =
z_{\rm iso}$) required for mechanically stable packings. ICS display harmonic
vibrational response, where the density of vibrational modes from the Fourier
transform of the velocity autocorrelation function is a set of sharp peaks at
eigenfrequencies $\omega_k^d$ of the dynamical matrix evaluated at $T_0=0$.
Hypo-coordinated solids (HCS) occur both above and below jamming onset within
the region defined by $\Delta \phi > \Delta \phi^*_-(T_0)$, $\Delta \phi <
\Delta \phi^*_+(T_0)$, and $\Delta \phi > \Delta \phi_{cb}(T_0)$. In this
region, the network of interparticle contacts fluctuates with $< z> \approx
z_{\rm iso}/2$, but cage-breaking particle rearrangements do not occur. The HCS
vibrational response is nonharmonic, {\it i.e} the density of vibrational modes
$D(\omega)$ is not a collection of sharp peaks at $\omega_k^d$, and its precise
form depends on the measurement method. For $\Delta \phi > \Delta
\phi_{cb}(T_0)$ and $\Delta \phi < \Delta \phi^*_{-}(T_0)$, the system behaves
as a hard-particle liquid.


title: Aggregation and Ordering in Factorised Databases

abstract:
  A common approach to data analysis involves understanding and manipulating
succinct representations of data. In earlier work, we put forward a succinct
representation system for relational data called factorised databases and
reported on the main-memory query engine FDB for select-project-join queries on
such databases.
  In this paper, we extend FDB to support a larger class of practical queries
with aggregates and ordering. This requires novel optimisation and evaluation
techniques. We show how factorisation coupled with partial aggregation can
effectively reduce the number of operations needed for query evaluation. We
also show how factorisations of query results can support enumeration of tuples
in desired orders as efficiently as listing them from the unfactorised, sorted
results.
  We experimentally observe that FDB can outperform off-the-shelf relational
engines by orders of magnitude.


title:
WOCS 40007: A Detached Eclipsing Binary near the Turnoff of the Open
  Cluster NGC 6819

abstract:
  We analyze extensive BVR_cI_c time-series photometry and radial-velocity
measurements for WOCS 40007 (Auner 259; KIC 5113053), a double-lined detached
eclipsing binary and a member of the open cluster NGC 6819. Utilizing
photometric observations from the 1-meter telescope at Mount Laguna Observatory
and spectra from the WIYN 3.5-meter telescope, we measure precise and accurate
masses (~1.6% uncertainty) and radii (~0.5%) for the binary components. In
addition, we discover a third star orbiting the binary with a period greater
than 3000 days using radial velocities and Kepler eclipse timings.
  Because the stars in the eclipsing binary are near the cluster turnoff, they
are evolving rapidly in size and are sensitive to age. With a metallicity of
[Fe/H]=+0.09+/-0.03, we find the age of NGC 6819 to be about 2.4 Gyr from CMD
isochrone fitting and 3.1+/-0.4 Gyr by analyzing the mass-radius (M-R) data for
this binary. The M-R age is above previous determinations for this cluster, but
consistent within 1 sigma uncertainties. When the M-R data for the primary star
of the additional cluster binary WOCS 23009 is included, the weighted age
estimate drops to 2.5+/-0.2 Gyr, with a systematic uncertainty of at least 0.2
Gyr. The age difference between our CMD and M-R findings may be the result of
systematic error in the metallicity or helium abundance used in models, or due
to slight radius inflation of one or both stars in the WOCS 40007 binary.