title:
Characterizations of EP and normal Banach algebra elements and Banach
  space operators

abstract:
  Several characterizations of EP and normal Moore-Penrose invertible Banach
algebra elements will be considered. The Banach space operator case will be
also studied. The results of the present article will extend well known facts
obtained in the frames of matrices and Hilbert space operators.


title: Measurements of the \gamma * p --> \Delta(1232) reaction at low Q2

abstract:
  We report new p$(\vec{e},e^\prime p)\pi^\circ$ measurements in the
$\Delta^{+}(1232)$ resonance at the low momentum transfer region utilizing the
magnetic spectrometers of the A1 Collaboration at MAMI. The mesonic cloud
dynamics are predicted to be dominant and appreciably changing in this region
while the momentum transfer is sufficiently low to be able to test chiral
effective calculations. The results disagree with predictions of constituent
quark models and are in reasonable agreement with dynamical calculations with
pion cloud effects, chiral effective field theory and lattice calculations. The
reported measurements suggest that improvement is required to the theoretical
calculations and provide valuable input that will allow their refinements.


title: Galactic rotation curves in hybrid metric-Palatini gravity

abstract:
  Generally, the dynamics of test particles around galaxies, as well as the
corresponding mass deficit, is explained by postulating the existence of a
hypothetical dark matter. In fact, the behavior of the rotation curves shows
the existence of a constant velocity region, near the baryonic matter
distribution, followed by a quick decay at large distances. In this work, we
consider the possibility that the behavior of the rotational velocities of test
particles gravitating around galaxies can be explained within the framework of
the recently proposed hybrid metric-Palatini gravitational theory. The latter
is constructed by modifying the metric Einstein-Hilbert action with an $f(R)$
term in the Palatini formalism. It was shown that the theory unifies local
constraints and the late-time cosmic acceleration, even if the scalar field is
very light. In the intermediate galactic scale, we show explicitly that in the
hybrid metric-Palatini model the tangential velocity can be explicitly obtained
as a function of the scalar field of the equivalent scalar-tensor description.
The possibility of constraining the form of the scalar field and the parameters
of the model by using the stellar velocity dispersions is also analyzed.
Furthermore, the Doppler velocity shifts are also obtained in terms of the
scalar field. All the physical and geometrical quantities and the numerical
parameters in the hybrid metric-Palatini model can be expressed in terms of
observable/measurable parameters, such as the tangential velocity, the baryonic
mass of the galaxy, the Doppler frequency shifts, and the stellar dispersion
velocity, respectively. Therefore, the obtained results open the possibility of
testing the hybrid metric-Palatini gravitational models at the galactic or
extra-galactic scale by using direct astronomical and astrophysical
observations.


title:
Novel considerations about the error budget of the LAGEOS-based tests of
  frame-dragging with GRACE geopotential models

abstract:
  A realistic assessment of the uncertainties in the even zonals of a given
geopotential model must be made by directly comparing its coefficients with
those of a wholly independent solution of superior formal accuracy. Otherwise,
a favorable selective bias is introduced in the evaluation of the total error
budget of the LAGEOS-based Lense-Thirring tests yielding likely too optimistic
figures for it. By applying a novel approach which recently appeared in the
literature, the second (L = 4) and the third (L = 6) even zonals turn out to be
uncertain at a 2-3 10^-11 (L = 4) and 3-4 10^-11 (L = 6) level, respectively,
yielding a total gravitational error of about 27-28%, with an upper bound of
37-39%. The results by Ries et al. themselves yield an upper bound for it of
about 33%. The low-degree even zonals are not exclusively determined from the
GRACE Satellite-to-Satellite Tracking (SST) range since they affect it with
long-period, secular-like signatures over orbital arcs longer than one orbital
period: GRACE SST is not accurately sensitive to such signals. Conversely,
general relativity affects it with short-period effects as well. Thus, the
issue of the a priori "imprinting" of general relativity itself in the
GRACE-based models used so far remains open.

categories: gr-qc astro-ph.EP physics.geo-ph physics.space-ph


title: Counting Prime $k$-tuples

abstract:
  Exact summatory functions that count the number of prime $k$-tuples up to
some cut-off integer are presented. Related summatory $k$-tuple analogs of the
first and second Chebyshev functions are then defined. Using a gamma
distribution hypothesis for prime powers, associated average summatory
functions are conjectured. With exact and average summatory functions in hand,
pertinent $k$-tuple zeta functions can be identified, and Perron's formula
allows the formulation of $k$-tuple analogs of explicit formulae. The $k$-tuple
zeta functions are then used to make some inferences about $k$-tuple primes.


title:
Dynamics and Separation of Circularly Moving Particles in Asymmetric
  Patterned Arrays

abstract:
  There are many examples of driven and active matter systems containing
particles that exhibit circular motion with different chiralities, such as
swimming bacteria near surfaces or certain types of self-driven colloidal
particles. Circular motion of passive particles can also be induced with an
external rotating drive. Here we examine particles that move in circles and
interact with a periodic array of asymmetric L-shaped obstacles. We find a
series of dynamical phases as a function of swimming radius, including regimes
where the particle motion is rectified, producing a net dc motion. The
direction of the rectification varies with the swimming radius, permitting the
separation of particles with different swimming radii. Particles with the same
swimming radius but different chirality can also move in different directions
over the substrate and be separated. The rectification occurs for specific
windows of swimming radii corresponding to periodic orbits in which the
particles interact one or more times with the barriers per rotation cycle. The
rectification effects are robust against the addition of thermal or diffusive
effects, and are in some cases even enhanced by these effects.


title: Minkowski tensor density formulas for Boolean models

abstract:
  A stationary Boolean model is the union set of random compact particles which
are attached to the points of a stationary Poisson point process. For a
stationary Boolean model with convex grains we consider a recently developed
collection of shape descriptors, the so called Minkowski tensors. By combining
spatial and probabilistic averaging we define Minkowski tensor densities of a
Boolean model. These densities are global characteristics of the union set
which can be estimated from observations. In contrast local characteristics
like the mean Minkowski tensor of a single random particle cannot be observed
directly, since the particles overlap. We relate the global to the local
properties by density formulas for the Minkowski tensors. These density
formulas generalize the well known formulas for intrinsic volume densities and
are obtained by applying results from translative integral geometry. For an
isotropic Boolean model we observe that the Minkowski tensor densities are
proportional to the intrinsic volume densities, whereas for a non-isotropic
Boolean model this is usually not the case. Our results support the idea that
the degree of anisotropy of a Boolean model may be expressed in terms of the
Minkowski tensor densities. Furthermore we observe that for smooth grains the
mean curvature radius function of a particle can be reconstructed from the
Minkowski tensor densities. In a simulation study we determine numerically
Minkowski tensor densities for non-isotropic Boolean models based on ellipses
and on rectangles in two dimensions and find excellent agreement with the
derived analytic density formulas. The tensor densities can be used to
characterize the orientational distribution of the grains and to estimate model
parameters for non-isotropic distributions.


title: Dynamics of Boolean Networks

abstract:
  Boolean networks are special types of finite state time-discrete dynamical
systems. A Boolean network can be described by a function from an n-dimensional
vector space over the field of two elements to itself. A fundamental problem in
studying these dynamical systems is to link their long term behaviors to the
structures of the functions that define them. In this paper, a method for
deriving a Boolean network's dynamical information via its disjunctive normal
form is explained. For a given Boolean network, a matrix with entries 0 and 1
is associated with the polynomial function that represents the network, then
the information on the fixed points and the limit cycles is derived by
analyzing the matrix. The described method provides an algorithm for the
determination of the fixed points from the polynomial expression of a Boolean
network. The method can also be used to construct Boolean networks with
prescribed limit cycles and fixed points. Examples are provided to explain the
algorithm.


title:
Phase Field Crystal Model for Magneto-Elasticity in Isotropic
  Ferromagnetic Solids

abstract:
  A new isotropic magneto-elastic phase field crystal (PFC) model to study the
relation between morphological structure and magnetic properties of pure
ferromagnetic solids is introduced. Analytic calculations were used to
determine the phase diagram and obtain the relationship between elastic strains
and magnetization. Time dependent numerical simulations were used to
demonstrate the effect of grain boundaries on the formation of magnetic
domains. It was shown that the grain boundaries act as nucleating sites for
domains of reverse magnetization. Finally, we derive a relation for coercivity
versus grain mis-orientation in the isotropic limit.


title:
Herschel imaging and spectroscopy of the nebula around the luminous blue
  variable star WRAY 15-751

abstract:
  We have obtained far-infrared Herschel PACS imaging and spectroscopic
observations of the nebular environment of the luminous blue variable WRAY
15-751. These images clearly show that the main, dusty nebula is a shell of
radius 0.5 pc and width 0.35 pc extending outside the H-alpha nebula. They also
reveal a second, bigger and fainter dust nebula, observed for the first time.
Both nebulae lie in an empty cavity, likely the remnant of the O-star wind
bubble formed when the star was on the main sequence. The kinematic ages of the
nebulae are about 20000 and 80000 years and each nebula contains about 0.05
Msun of dust. Modeling of the inner nebula indicates a Fe-rich dust. The
far-infrared spectrum of the main nebula revealed forbidden emission lines
coming from ionized and neutral gas. Our study shows that the main nebula
consists of a shell of ionized gas surrounded by a thin photodissociation
region illuminated by an "average" early-B star. The derived abundance ratios
N/O=1.0+/-0.4 and C/O=0.4+/-0.2 indicate a mild N/O enrichment. We estimate
that the inner shell contains 1.7+/-0.6 Msun of gas. Assuming a similar
dust-to-gas ratio for the outer nebula, the total mass ejected by WRAY 15-751
amounts to 4+/-2 Msun. The measured abundances, masses and kinematic ages of
the nebulae were used to constrain the evolution of the star and the epoch at
which the nebulae were ejected. Our results point to an ejection of the nebulae
during the RSG evolutionary phase of an ~ 40 Msun star. The presence of
multiple shells around the star suggests that the mass-loss was not a
continuous ejection but rather a series of episodes of extreme mass-loss. Our
measurements are compatible with the recent evolutionary tracks computed for an
40 Msun star with little rotation. They support the O-BSG-RSG-YSG-LBV filiation
and the idea that high-luminosity and low-luminosity LBVs follow different
evolutionary paths.


title: Luttinger parameters of interacting fermions in 1D at high energies

abstract:
  Interactions between electrons in one-dimension are fully described at low
energies by only a few parameters of the Tomonaga-Luttinger model which is
based on linearisation of the spectrum. We consider a model of spinless
fermions with a short range interaction via the Bethe-Ansatz technique and show
that a Luttinger parameter emerges in an observable beyond the low energy
limit. A distinct feature of the spectral function, the edge that marks the
lowest possible excitation energy for a given momentum, is parabolic for
arbitrary momenta and the prefactor is a function of the Luttinger parameter,
K.


title:
Interferometric observations of nitrogen-bearing molecular species in
  the star-forming core ahead of HH 80N

abstract:
  We present VLA NH3 and PdBI NH2D and H13NC observations of the star forming
core ahead of HH 80N, the optically obscured northern counterpart of the
Herbig-Haro objects HH 80/81. The main goal is to determine the kinematical
information of the high density regions of the core ($n\lesssim 10^5$
cm$^{-3}$), missed in previous works due to the depletion of the species
observed (e.g. CS). The obtained maps show different kinematical signatures
between the eastern and western parts of the core, suggesting a possible
dynamical interaction of the core with the HH 80/81/80N outflow. The analysis
of the Position-Velocity (PV) plots of these species rules out a previous
interpretation of having a molecular ring-like structure of $6\times 10^4$ AU
of radius traced by CS infalling onto a central protostar found in the core
(IRS1). High degree of deuteration, with respect to the central part of the
core harboring IRS1, is derived in the eastern part, where a dust condensation
(SE) is located. This deuteration trend of NH3 suggests that SE is in a
prestellar evolutionary stage, earlier than that of the IRS1. Since SE is the
closest condensation to the HH 80N/81/80N outflow, in case of having
outflow-core dynamical interaction, it should be perturbed first and be the
most evolved condensation in the core. Therefore, the derived evolutionary
sequence for SE and IRS1 makes the outflow triggered star formation on IRS1
unlikely.


title:
Density Functional Theory Study of the Entangled Crystal, Magnetic, and
  Electronic Structures of PuGa3

abstract:
  Systematically studying the crystal, magnetic, and electronic structures of
PuGa3 with density functional theory (DFT) reveals the entanglement of the
three types of structure. Magnetic structure affects the energy more strongly
than crystal structure. For DFT to correctly order the crystal structures in
agreement with experiment requires special treatment of the electronic
correlation in the 5f states, exemplified here by the GGA+U approach. The upper
and lower Hubbard bands change with increasing U in very dissimilar ways for
the two most different crystal structures. The results suggest the
effectiveness of using magnetic structure to simulate correlation effects in
the actinides depends on both the magnetic and the crystal structure.


title:
Computing reaction rates in bio-molecular systems using discrete
  macro-states

abstract:
  Computing reaction rates in biomolecular systems is a common goal of
molecular dynamics simulations. The reactions considered often involve
conformational changes in the molecule, either changes in the structure of a
protein or the relative position of two molecules, for example when modeling
the binding of a protein and ligand. Here we will consider the general problem
of computing the rate of transfer from a subset A of the conformational space
Omega to a subset B of Omega. It is assumed that A and B are associated with
minimum energy basins and are long-lived states.
  Rates can be obtained using many different methods. We review some of the
most popular approaches. We organize the different approaches roughly in
chronological order and under four main categories: reactive flux, transition
path sampling, conformation dynamics. The fourth class of methods, to which we
do not give any specific name, in some sense attempts to combine features from
transition path sampling and conformation dynamics. They include
non-equilibrium umbrella sampling (Warmflash et al. [2007], Dickson et al.
[2009b]), and weighted ensemble dynamics (Huber and Kim [1996]).


title:
Density Functional Theory Study of the Structural Properties of PuH_x,
  2<=x<=3

abstract:
  Plutonium dihydride and trihydride show strikingly similar crystal structures
when viewed as close-packed Pu planes with ABC and AB stacking, respectively.
The similarity serves as a framework for density functional theory (DFT)
calculations of PuH2, PuH3, and intermediate compositions. Agreement between
structures observed in experiment and in the DFT description of the Pu-H system
requires accounting for the strong electronic correlation in the f orbitals,
achieved here with the addition of a Hubbard parameter U. The hysteresis
measured between hydriding and dehydriding can be attributed to the effect of
stacking of the close-packed Pu planes on the energy as a function of
stoichiometry, calculated using the GGA+U approach. Changes in the interstitial
positions occupied by the H atoms affect the energy by amounts that are
negligible compared to room temperature; changes in the magnetic structure lead
to equally small energy differences.


title: Critical exponents in quantum Einstein gravity

abstract:
  The quantum Einstein gravity is treated by the functional renormalization
group method using the Einstein-Hilbert action. The ultraviolet non-Gaussian
fixed point is determined and its corresponding exponent of the correlation
length is calculated for a wide range of regulators. It is shown that the
exponent provides a minimal sensitivity to the parameters of the regulator
which correspond to the Litim's regulator.


title: Greatest Prime Divisors of Polynomial Values over Function Fields

abstract:
  For a function field $K$ and fixed polynomial $F\in K[x]$ and varying $f\in
F$ (under certain restrictions) we give a lower bound for the degree of the
greatest prime divisor of $F(f)$ in terms of the height of $f$, establishing a
strong result for the function field analogue of a classical problem in number
theory.


title: On a sumset conjecture of Erd\H{o}s

abstract:
  Erd\H{o}s conjectured that for any set $A\subseteq \mathbb{N}$ with positive
lower asymptotic density, there are infinite sets $B,C\subseteq \mathbb{N}$
such that $B+C\subseteq A$. We verify Erd\H{o}s' conjecture in the case that
$A$ has Banach density exceeding $\frac{1}{2}$. As a consequence, we prove
that, for $A\subseteq \mathbb{N}$ with positive Banach density (a much weaker
assumption than positive lower density), we can find infinite $B,C\subseteq
\mathbb{N}$ such that $B+C$ is contained in the union of $A$ and a translate of
$A$. Both of the aforementioned results are generalized to arbitrary countable
amenable groups. We also provide a positive solution to Erd\H{o}s' conjecture
for subsets of the natural numbers that are pseudorandom.


title: The Electron Firehose and Ordinary-Mode Instabilities in Space Plasmas

abstract:
  The selfgenerated wave fluctuations are particularly interesting in the solar
wind and magnetospheric plasmas, where Coulomb collisions are rare and cannot
explain the observed states of quasi-equilibrium. Linear theory predicts that
the firehose and the ordinary-mode instabilities can develop under the same
conditions, confusing the role of these instabilities in conditioning the
space-plasma properties. The hierarchy of these two instabilities is
reconsidered here for nonstreaming plasmas with an electron temperature
anisotropy $T_\parallel > T_\perp$, where $\parallel$ and $\perp$ denote
directions with respect to the local mean magnetic field. In addition to the
previous comparative analysis, here the entire 3D wave-vector spectrum of the
competing instabilities is investigated, paying particular attention to the
oblique firehose instability and the relatively poorly known ordinary-mode
instability. Results show a dominance of the oblique firehose instability with
a threshold lower than the parallel firehose instability and lower than the
ordinary-mode instability. For larger anisotropies, the ordinary mode can grow
faster, with maximum growth rates exceeding the ones of the oblique firehose
instability. In contrast to previous studies that claimed a possible activity
of the ordinary-mode in the small $\beta [< 1]$ regimes, here it is rigorously
shown that only the large $\beta [> 1]$ regimes are susceptible to these
instabilities.


title: Multiplier Hopf algebroids. Basic theory and examples

abstract:
  Multiplier Hopf algebroids are algebraic versions of quantum groupoids that
generalize Hopf algebroids to the non-unital case and weak (multiplier) Hopf
algebras to non-separable base algebras. The main structure maps of a
multiplier Hopf algebroid are a left and a right comultiplication. We show that
bijectivity of two associated canonical maps is equivalent to the existence of
an antipode, discuss invertibility of the antipode, and present some examples
and special cases.


title:
Indirect measurement of $sin^2\theta_W$ (M_W) using e+e- pairs in the
  Z-boson region with $p\bar{p}$ collisions at a center-of-momentum energy of
  1.96 TeV

abstract:
  Drell-Yan lepton pairs are produced in the process $p\bar{p} \rightarrow
e^+e^- + X$ through an intermediate $\gamma^*/Z$ boson. The lepton angular
distributions are used to provide information on the electroweak-mixing
parameter $sin^2\theta_W$ via its observable effective-leptonic
$sin^2\theta_W$, or $sin^2\theta^{lept}_{eff}$. A new method to infer
$sin^2\theta_W$, or equivalently, the W-boson mass M_W in the on-shell scheme,
is developed and tested using a previous CDF Run II measurement of angular
distributions from electron pairs in a sample corresponding to 2.1 fb-1 of
integrated luminosity from $p\bar{p}$ collisions at a center-of-momentum energy
of 1.96 TeV. The value of $sin^2\theta^{lept}_{eff}$ is found to be 0.2328 +-
0.0010. Within a specified context of the standard model, this results in
$sin^2\theta_W$ = 0.2246 +- 0.0009 which corresponds to a W-boson mass of
80.297 +- 0.048 GeV/c^2, in agreement with previous determinations in
electron-position collisions and at the Tevatron collider.


title: Fault-ignorant Quantum Search

abstract:
  We investigate the problem of quantum searching on a noisy quantum computer.
Taking a 'fault-ignorant' approach, we analyze quantum algorithms that solve
the task for various different noise strengths, which are possibly unknown
beforehand. We prove lower bounds on the runtime of such algorithms and thereby
find that the quadratic speedup is necessarily lost (in our noise models).
However, for low but constant noise levels the algorithms we provide (based on
Grover's algorithm) still outperform the best noiseless classical search
algorithm.


title: How to Build an RSS Feed using ASP

abstract:
  RSS is a XML based format. The Current popular version of RSS is RSS version
2.0. The purpose of adding an RSS feed to your site is to show if anything new
is added to the site. For example, if a new article or blog or news item is
added to your site that should automatically appear in the RSS feed so that the
visitors/ RSS readers will automatically get updated about this new addition.
The RSS feed is also called RSS channel.
  There are two main elements of the RSS XML file, one is the header or channel
element that describes the details about the site/feeder and other is the body
or item element that describes the consists of individual articles/entries
updated in the site. As the format of the RSS feed file is pretty simple, it
can be coded in any language, ASP, PHP or anything of that sort. We will build
an RSS feeder using classical ASP (Active Server Pages) code in this article.


title: S-duality as Fourier transform for arbitrary $\epsilon_1,\epsilon_2$

abstract:
  The AGT relations reduce S-duality to the modular transformations of
conformal blocks. It was recently conjectured that for the four-point conformal
block the modular transform up to the non-perturbative contributions can be
written in form of the ordinary Fourier transform when
$\beta\equiv-\epsilon_1/\epsilon_2=1$. Here we extend this conjecture to
general values of $\epsilon_1,\epsilon_2$. Namely, we argue that for a properly
normalized four-point conformal block the S-duality is perturbatively given by
the Fourier transform for arbitrary values of the deformation parameters
$\epsilon_1,\epsilon_2$. The conjecture is based on explicit perturbative
computations in the first few orders of the string coupling constant
$g^2\equiv-\epsilon_1\epsilon_2$ and hypermultiplet masses.


title: Inclusive Cross Sections in ME+PS Merging

abstract:
  We discuss an extension of matrix element plus parton shower merging at
leading and next-to-leading order. The algorithm does preserve inclusive cross
sections at the respective input order. This constraint avoids potentially
large logarithmic contributions, which would require approximate (N)NLO
contributions to cancel against.


title: Generalized Row-Action Methods for Tomographic Imaging

abstract:
  Row-action methods play an important role in tomographic image
reconstruction. Many such methods can be viewed as incremental gradient methods
for minimizing a sum of a large number of convex functions, and despite their
relatively poor global rate of convergence, these methods often exhibit fast
initial convergence which is desirable in applications where a low-accuracy
solution is acceptable. In this paper, we propose relaxed variants of a class
of incremental proximal gradient methods, and these variants generalize many
existing row-action methods for tomographic imaging. Moreover, they allow us to
derive new incremental algorithms for tomographic imaging that incorporate
different types of prior information via regularization. We demonstrate the
efficacy of the approach with some numerical examples.


title:
Regularized Spherical Polar Fourier Diffusion MRI with Optimal
  Dictionary Learning

abstract:
  Compressed Sensing (CS) takes advantage of signal sparsity or compressibility
and allows superb signal reconstruction from relatively few measurements. Based
on CS theory, a suitable dictionary for sparse representation of the signal is
required. In diffusion MRI (dMRI), CS methods were proposed to reconstruct
diffusion-weighted signal and the Ensemble Average Propagator (EAP), and there
are two kinds of Dictionary Learning (DL) methods: 1) Discrete Representation
DL (DR-DL), and 2) Continuous Representation DL (CR-DL). DR-DL is susceptible
to numerical inaccuracy owing to interpolation and regridding errors in a
discretized q-space. In this paper, we propose a novel CR-DL approach, called
Dictionary Learning - Spherical Polar Fourier Imaging (DL-SPFI) for effective
compressed-sensing reconstruction of the q-space diffusion-weighted signal and
the EAP. In DL-SPFI, an dictionary that sparsifies the signal is learned from
the space of continuous Gaussian diffusion signals. The learned dictionary is
then adaptively applied to different voxels using a weighted LASSO framework
for robust signal reconstruction. The adaptive dictionary is proved to be
optimal. Compared with the start-of-the-art CR-DL and DR-DL methods proposed by
Merlet et al. and Bilgic et al., espectively, our work offers the following
advantages. First, the learned dictionary is proved to be optimal for Gaussian
diffusion signals. Second, to our knowledge, this is the first work to learn a
voxel-adaptive dictionary. The importance of the adaptive dictionary in EAP
reconstruction will be demonstrated theoretically and empirically. Third,
optimization in DL-SPFI is only performed in a small subspace resided by the
SPF coefficients, as opposed to the q-space approach utilized by Merlet et al.
The experiment results demonstrate the advantages of DL-SPFI over the original
SPF basis and Bilgic et al.'s method.


title:
A first linear cosmological structure formation scenario under extended
  gravity

abstract:
  The inability of primordial baryonic density fluctuations, as observed in the
cosmic microwave background (CMB), to grow into the present day astronomical
structures is well established, under Newtonian and Einsteinian gravity. It is
hence customary to assume the existence of an underlying dark matter component
with density fluctuations, $\Delta(M)$, having amplitudes much larger than what
CMB observations imply for the baryons. This is in fact one of the recurrent
arguments used in support of the dark matter hypothesis. In this letter we
prove that the same extended theory of gravity which has been recently shown to
accurately reproduce gravitational lensing observations, in absence of any dark
matter, and which in the low velocity regime converges to a MONDian force law,
implies a sufficiently amplified self-gravity to allow purely baryonic
fluctuations with amplitudes in accordance with CMB constraints to naturally
grow into the $z=0$ astrophysical structures detected. The linear structure
formation scenario which emerges closely resembles the standard concordance
cosmology one, as abundantly calibrated over the last decade to match multiple
observational constraints at various redshifts. However, in contrast with what
occurs in the concordance cosmology, this follows not from a critical
dependence on initial conditions and the fine tuning of model parameters, but
from the rapid convergence of highly arbitrary initial conditions onto a well
defined $\Delta(M,z)$ attractor solution.


title: Congruences of the fork extensions. I. The Congruence Extension Property

abstract:
  For a slim, planar, semimodular lattice, G. Cz\'edli and E.\,T. Schmidt
introduced the fork extension in 2012. In this note we prove that the fork
extension has the Congruence Extension Property. This paper has been merged
with Part II, under the title Congruences of fork extensions of slim
semimodular lattices, see arXiv: 1307.8404


title:
A Purely Combinatorial Approach to Simultaneous Polynomial Recurrence
  Modulo 1

abstract:
  Using purely combinatorial means we obtain results on simultaneous
Diophantine approximation modulo 1 for systems of polynomials with real
coefficients and no constant term.


title:
Epsilon-neighborhoods of orbits of parabolic diffeomorphisms and
  cohomological equations

abstract:
  In this article, we study analyticity properties of (directed) areas of
epsilon-neighborhoods of orbits of parabolic germs. The article is motivated by
the question of analytic classification using epsilon-neighborhoods of orbits
in the simplest formal class. We show that the coefficient in front of
epsilon^2 term in the asymptotic expansion in epsilon, which we call the
principal part of the area, is a sectorially analytic function of initial point
of the orbit. It satisfies a cohomological equation similar to the standard
trivialization equation for parabolic diffeomorphisms. We give necessary and
sufficient conditions on a diffeomorphism f for the existence of globally
analytic solution of this equation. Furthermore, we introduce new
classification type for diffeomorphisms implied by this new equation and
investigate the relative position of its classes with respect to the analytic
classes.


title: Distributed Online Big Data Classification Using Context Information

abstract:
  Distributed, online data mining systems have emerged as a result of
applications requiring analysis of large amounts of correlated and
high-dimensional data produced by multiple distributed data sources. We propose
a distributed online data classification framework where data is gathered by
distributed data sources and processed by a heterogeneous set of distributed
learners which learn online, at run-time, how to classify the different data
streams either by using their locally available classification functions or by
helping each other by classifying each other's data. Importantly, since the
data is gathered at different locations, sending the data to another learner to
process incurs additional costs such as delays, and hence this will be only
beneficial if the benefits obtained from a better classification will exceed
the costs. We model the problem of joint classification by the distributed and
heterogeneous learners from multiple data sources as a distributed contextual
bandit problem where each data is characterized by a specific context. We
develop a distributed online learning algorithm for which we can prove
sublinear regret. Compared to prior work in distributed online data mining, our
work is the first to provide analytic regret results characterizing the
performance of the proposed algorithm.


title: Post LHC8 SUSY benchmark points for ILC physics

abstract:
  We re-evaluate prospects for supersymmetry at the proposed International
Linear e^+e^- Collider (ILC) in light of the first two years of serious data
taking at LHC: LHC7 with ~5 fb^{-1} of pp collisions at sqrt{s}=7 TeV and LHC8
with ~20 fb^{-1} at \sqrt{s}=8 TeV. Strong new limits from LHC8 SUSY searches,
along with the discovery of a Higgs boson with m_h~125 GeV, suggest a paradigm
shift from previously popular models to ones with new and compelling
signatures. After a review of the current status of supersymmetry, we present a
variety of new ILC benchmark models, including: natural SUSY,
radiatively-driven natural SUSY (RNS), NUHM2 with low m_A, a focus point case
from mSUGRA/CMSSM, non-universal gaugino mass (NUGM) model,
stau-coannihilation, Kallosh-Linde/spread SUSY model, mixed gauge-gravity
mediation, normal scalar mass hierarchy (NMH), and one example with the
recently discovered Higgs boson being the heavy CP-even state H. While all
these models at present elude the latest LHC8 limits, they do offer intriguing
case study possibilities for ILC operating at \sqrt{s}~0.25-1 TeV. The
benchmark points also present a view of the widely diverse SUSY phenomena which
might still be expected in the post LHC8 era at both LHC and ILC.


title: Averaging VMAT treatment plans for multi-criteria navigation

abstract:
  The main approach to smooth Pareto surface navigation for radiation therapy
multi-criteria treatment planning involves taking real-time averages of
pre-computed treatment plans. In fluence-based treatment planning, fluence maps
themselves can be averaged, which leads to the dose distributions being
averaged due to the linear relationship between fluence and dose. This works
for fluence-based photon plans and proton spot scanning plans. In this
technical note, we show that two or more sliding window volumetric modulated
arc therapy (VMAT) plans can be combined by averaging leaf positions in a
certain way, and we demonstrate that the resulting dose distribution for the
averaged plan is approximately the average of the dose distributions of the
original plans. This leads to the ability to do Pareto surface navigation, i.e.
interactive multi-criteria exploration of VMAT plan dosimetric tradeoffs.


title: The fixation line in the ${\Lambda}$-coalescent

abstract:
  We define a Markov process in a forward population model with backward
genealogy given by the $\Lambda$-coalescent. This Markov process, called the
fixation line, is related to the block counting process through its hitting
times. Two applications are discussed. The probability that the $n$-coalescent
is deeper than the $(n-1)$-coalescent is studied. The distribution of the
number of blocks in the last coalescence of the $n$-$\operatorname
{Beta}(2-\alpha,\alpha)$-coalescent is proved to converge as
$n\rightarrow\infty$, and the generating function of the limiting random
variable is computed.


title:
Explicit Description of HARA Forward Utilities and Their Optimal
  Portfolios

abstract:
  This paper deals with forward performances of HARA type. Precisely, for a
market model in which stock price processes are modeled by a locally bounded
$d$-dimensional semimartingale, we elaborate a complete and explicit
characterization for this type of forward utilities. Furthermore, the optimal
portfolios for each of these forward utilities are explicitly described. Our
approach is based on the minimal Hellinger martingale densities that are
obtained from the important statistical concept of Hellinger process. These
martingale densities were introduced recently, and appeared herein tailor-made
for these forward utilities. After outlining our parametrization method for the
HARA forward, we provide illustrations on discrete-time market models. Finally,
we conclude our paper by pointing out a number of related open questions.


title: The 1/2 BPS Wilson loop in ABJ(M) at two loops: The details

abstract:
  We compute the expectation value of the 1/2 BPS circular Wilson loop operator
in ABJ(M) theory at two loops in perturbation theory. Our result turns out to
be in exact agreement with the weak coupling limit of the prediction coming
from localization, including finite N contributions associated to non-planar
diagrams. It also confirms the identification of the correct framing factor
that connects framing-zero and framing-one expressions, previously proposed.
The evaluation of the 1/2 BPS operator is made technically difficult in
comparison with other observables of ABJ(M) theory by the appearance of
integrals involving the coupling between fermions and gauge fields, which are
absent for instance in the 1/6 BPS case. We describe in detail how to
analytically solve these integrals in dimensional regularization with
dimensional reduction (DRED). By suitably performing the physical limit to
three dimensions we clarify the role played by short distance divergences on
the final result and the mechanism of their cancellation.


title:
Perturbative evaluation of circular 1/2 BPS Wilson loops in N = 6 Super
  Chern-Simons theories

abstract:
  We present a complete two-loop analysis of the quantum expectation value for
circular BPS Wilson loops in ABJ(M) theories. We examine in details the 1/2 BPS
case, that requires non-trivial fermionic couplings with the contour, finding
perfect agreement with the exact matrix model answer at zero framing. The
result is obtained through a careful application of DRED regularization scheme,
combined with a judicious rearrangement of the relevant perturbative
contributions that reduces the computation to simple integrals. We carefully
analyze the contribution of fermions that is crucial for the consistency with
the localization procedure and point out the arising of pivotal evanescent
terms, discussing their meaning in relation to Ward identities.


title: Categorical and Geographical Separation in Science

abstract:
  We perform the analysis of scientific collaboration at the level of
universities. The scope of this study is to answer two fundamental questions:
(i) can one indicate a category (i.e., a scientific discipline) that has the
greatest impact on the rank of the university and (ii) do the best universities
collaborate with the best ones only? Using two university ranking lists (ARWU
and QS) as well as data from the Science Citation Index we show how the number
of publications in certain categories correlates with the university rank.
Moreover, using complex networks analysis, we give hints that the scientific
collaboration is highly embedded in the physical space and the number of common
papers decays with the distance between them. We also show the strength of the
ties between universities is proportional to product of their total number of
publications.


title: Quiet Sun magnetic fields observed by Hinode: Support for a local dynamo

abstract:
  The Hinode mission has revealed copious amounts of horizontal flux covering
the quiet Sun. Local dynamo action has been proposed to explain the presence of
this flux. We sought to test whether the quiet Sun flux detected by Hinode is
due to a local or the global dynamo by studying long-term variations in the
polarisation signals detectable at the disc centre of the quiet Sun between
November 2006 and May 2012, with particular emphasis on weak signals in the
internetwork. The investigation focusses on line-integrated circular
polarisation V_tot and linear polarisation LP_tot profiles obtained from the Fe
I 6302.5 \AA absorption line in Hinode SOT/SP. Both circular and linear
polarisation signals show no overall variation in the fraction of selected
pixels from 2006 until 2012. There is also no variation in the magnetic flux in
this interval of time. The probability density functions (PDF) of the
line-of-sight magnetic flux can be fitted with a power law from 1.17 x 10^17 Mx
to 8.53 x 10^18 Mx with index \alpha=-1.82 \pm 0.02 in 2007. The variation of
\alpha 's across all years does not exceed a significance of 1\sigma. Linearly
polarised features are also fitted with a power law, with index \alpha=-2.60
\pm 0.06 in 2007. Indices derived from linear polarisation PDFs of other years
also show no significant variation. Our results show that the ubiquitous
horizontal polarisation on the edges of bright granules seen by Hinode are
invariant during the minimum of cycle 23. This supports the notion that the
weak circular and linear polarisation is primarily caused by an independent
local dynamo.


title:
On the Hubble Space Telescope Trigonometric Parallax of the Dwarf Nova
  SS Cygni

abstract:
  SS Cygni is one of the brightest dwarf novae (DNe), and one of the
best-studied prototypes of the cataclysmic variables. Astrometric observations
with the Fine Guidance Sensors (FGS) on the Hubble Space Telescope (HST),
published in 2004, gave an absolute trigonometric parallax of 6.06+/-0.44 mas.
However, recent very-long-baseline interferometry (VLBI), obtained during radio
outbursts of SS Cyg, has yielded a significantly larger absolute parallax of
8.80+/-0.12 mas, as well as a large difference in the direction of the proper
motion compared to the HST result. The VLBI distance reduces the implied
luminosity of SS Cyg by about a factor of two, giving good agreement with
predictions based on accretion-disk theory in order to explain the observed DN
outburst behavior. This discrepancy raises the possibility of significant
systematic errors in FGS parallaxes and proper motions. We have reanalyzed the
archival HST/FGS data, including (1) a critical redetermination of the
parallaxes of the background astrometric reference stars, (2) updated input
values of the reference-star proper motions, and (3) correction of the position
measurements for color-dependent shifts. Our new analysis yields a proper
motion of SS Cyg that agrees well with the VLBI motion, and an absolute
parallax of 8.30+/-0.41 mas, also statistically concordant with the VLBI result
at the ~1.2 sigma level. Our results suggest that HST/FGS parallaxes are free
of large systematic errors, when the data are reduced using high-quality input
values for the astrometry of the reference stars, and when instrumental
signatures are properly removed.


title:
Analytic Framework for Students' Use of Mathematics in Upper-Division
  Physics

abstract:
  Many students in upper-division physics courses struggle with the
mathematically sophisticated tools and techniques that are required for
advanced physics content. We have developed an analytical framework to assist
instructors and researchers in characterizing students' difficulties with
specific mathematical tools when solving the long and complex problems that are
characteristic of upper-division. In this paper, we present this framework,
including its motivation and development. We also describe an application of
the framework to investigations of student difficulties with direct integration
in electricity and magnetism (i.e., Coulomb's Law) and approximation methods in
classical mechanics (i.e., Taylor series). These investigations provide
examples of the types of difficulties encountered by advanced physics students,
as well as the utility of the framework for both researchers and instructors.


title:
The HI Chronicles of LITTLE THINGS BCDs: Evidence for External
  Perturbations in the Morphology and Kinematics of Haro 29 and Haro 36

abstract:
  We analyze high angular and velocity resolution HI-line data of two LITTLE
THINGS (1) blue compact dwarfs (BCDs): Haro 29 and Haro 36. Both of these BCDs
are disturbed morphologically and kinematically. Haro 29's HI data reveal a
kinematic major axis that is offset from the optical major axis, and a
disturbed outer HI component, indicating that Haro 29 may have had a past
interaction. Position-velocity diagrams of Haro 36 indicate that it has two
kinematically separate components at its center and a likely tidal tail in
front of the galaxy. We find that Haro 36 most likely had an interaction in the
past, is currently interacting with an unknown companion, or is a merger
remnant. (1) "Local Irregulars That Trace Luminosity Extremes The HI Nearby
Galaxy Survey" http://www2.lowell.edu/users/dah/littlethings/index.html


title: A generalized Cuntz-Krieger uniqueness theorem for higher rank graphs

abstract:
  We present a uniqueness theorem for k-graph C*-algebras that requires neither
an aperiodicity nor a gauge invariance assumption. Specifically, we prove that
for the injectivity of a representation of a k-graph C*-algebra, it is
sufficient that the representation be injective on a distinguished abelian
C*-subalgebra. A crucial part of the proof is the application of an abstract
uniqueness theorem, which says that such a uniqueness property follows from the
existence of a jointly faithful collection of states on the ambient C*-algebra,
each of which is the unique extension of a state on the distinguished abelian
C*-subalgebra.


title:
On the Interaction of Adaptive Video Streaming with Content-Centric
  Networking

abstract:
  Two main trends in today's internet are of major interest for video streaming
services: most content delivery platforms coincide towards using adaptive video
streaming over HTTP and new network architectures allowing caching at
intermediate points within the network. We investigate one of the most popular
streaming service in terms of rate adaptation and opportunistic caching. Our
experimental study shows that the streaming client's rate selection trajectory,
i.e., the set of selected segments of varied bit rates which constitute a
complete video, is not repetitive across separate downloads. Also, the
involvement of caching could lead to frequent alternation between cache and
server when serving back client's requests for video segments. These
observations warrant cautions for rate adaption algorithm design and trigger
our analysis to characterize the performance of in-network caching for HTTP
streaming. Our analytic results show: (i) a significant degradation of cache
hit rate for adaptive streaming, with a typical file popularity distribution in
nowadays internet; (ii) as a result of the (usually) higher throughput at the
client-cache connection compared to client-server one, cache-server
oscillations due to misjudgments of the rate adaptation algorithm occur.
Finally, we introduce DASH-INC, a framework for improved video streaming in
caching networks including transcoding and multiple throughput estimation.


title:
Laser-Doping of Crystalline Silicon Substrates using Doped Silicon
  Nanoparticles

abstract:
  Crystalline Si substrates are doped by laser annealing of solution processed
Si. For this experiment, dispersions of highly B-doped Si nanoparticles (NPs)
are deposited onto intrinsic Si and laser processed using an 807.5nm cw-laser.
During laser processing the particles as well as a surface-near substrate layer
are melted to subsequently crystallize in the same orientation as the
substrate. The doping profile is investigated by secondary ion mass
spectroscopy revealing a constant B concentration of 2x10^18 cm^-3 throughout
the entire analyzed depth of 5\mu m. Four-point probe measurements demonstrate
that the effective conductivity of the doped sample is increased by almost two
orders of magnitude. The absolute doping depth is estimated to be in between
8\mu m and 100\mu m. Further, a pn-diode is created by laser doping an n-type
c-Si substrate using the Si NPs.


title: Symmetry Tests in Photo-Pion Production

abstract:
  Small angle electron scattering with intense electron beams opens up the
possibility of performing almost real photon induced reactions with thin,
polarized hydrogen and few body targets, allowing for the detection of low
energy charged particles.This promises to be much more effective than
conventional photon tagging techniques. For photo-pion reactions some
fundamental new possibilities include: tests of charge symmetry in the N-N
system by measurement of the neutron-neutron scattering length $a_{nn}$ in the
$\gamma D \rightarrow \pi^{+} nn$ reaction; tests of isospin breaking due to
the mass difference of the up and down quarks; measurements with polarized
targets are sensitive to $\pi$N phase shifts and will test the validity of the
Fermi-Watson (final state interaction) theorem. All of these experiments will
test the accuracy and energy region of validity of chiral effective theories.


title: The Centro-Affine Hadwiger Theorem

abstract:
  All upper semicontinuous and SL(n) invariant valuations on convex bodies
containing the origin in their interiors are completely classified. Each such
valuation is shown to be a linear combination of the Euler characteristic, the
volume, the volume of the polar body, and the recently discovered Orlicz
surface areas.


title: Small-world networks of Kuramoto oscillators

abstract:
  The Kuramoto model of coupled phase oscillators on small-world (SW) graphs is
analyzed in this work. When the number of oscillators in the network goes to
infinity, the model acquires a family of steady state solutions of degree q,
called q-twisted states. We show that this class of solutions plays an
important role in the formation of spatial patterns in the Kuramoto model on SW
graphs. In particular, the analysis of q-twisted elucidates the role of
long-range random connections in shaping the attractors in this model.
  We develop two complementary approaches for studying q-twisted states in the
coupled oscillator model on SW graphs: the linear stability analysis and the
numerical continuation. The former approach shows that long-range random
connections in the SW graphs promote synchronization and yields the estimate of
the synchronization rate as a function of the SW randomization parameter. The
continuation shows that the increase of the long-range connections results in
patterns consisting of one or several plateaus separated by sharp interfaces.
  These results elucidate the pattern formation mechanisms in nonlocally
coupled dynamical systems on random graphs.


title:
Memorial Contribution about Kolya Uraltsev's Talk at 2012 Workshop $B\to
  D**$

abstract:
  Uraltev has given us a deeper understanding of the forces underlying the data
from beauty and charm hadrons for the last 35 years and neutron EDM in the
future -- in particular about non-perturbative QCD. At the Workshop in the
November 2012 before his death he has focused mostly on the data about
semi-leptonic B decays beyond $B \to l \nu D/D^*$. Here is a very short review
of his talk at this Workshop. Next year colleagues will produce a `Memorial
Book' about Kolya Uraltsev's excellent contributions to fundamental dynamics.


title:
Optimal control of storage for arbitrage, with applications to energy
  systems

abstract:
  We study the optimal control of storage which is used for arbitrage, i.e. for
buying a commodity when it is cheap and selling it when it is expensive. Our
particular concern is with the management of energy systems, although the
results are generally applicable. We consider a model which may account for
nonlinear cost functions, market impact, input and output rate constraints and
inefficiencies or losses in the storage process. We develop an algorithm which
is maximally efficient in then sense that it incorporates the result that, at
each point in time, the optimal management decision depends only a finite, and
typically short, time horizon. We give examples related to the management of a
real-world system.


title: Dynamic phase transitions in simple driven kinetic networks

abstract:
  We analyze the probability distribution for entropy production rates of
trajectories evolving on a class of out-of-equilibrium kinetic networks. These
networks can serve as simple models for driven dynamical systems, which are of
particular importance in biological processes, where energy fluxes typically
result in non-equilibrium dynamics. By analyzing the fluctuations in the
entropy production, we demonstrate the emergence, in a large system size limit,
of a dynamic phase transition between two distinct dynamical regimes.


title: A Statistical Learning Theory Framework for Supervised Pattern Discovery

abstract:
  This paper formalizes a latent variable inference problem we call {\em
supervised pattern discovery}, the goal of which is to find sets of
observations that belong to a single ``pattern.'' We discuss two versions of
the problem and prove uniform risk bounds for both. In the first version,
collections of patterns can be generated in an arbitrary manner and the data
consist of multiple labeled collections. In the second version, the patterns
are assumed to be generated independently by identically distributed processes.
These processes are allowed to take an arbitrary form, so observations within a
pattern are not in general independent of each other. The bounds for the second
version of the problem are stated in terms of a new complexity measure, the
quasi-Rademacher complexity.


title: Data Fusion by Matrix Factorization

abstract:
  For most problems in science and engineering we can obtain data sets that
describe the observed system from various perspectives and record the behavior
of its individual components. Heterogeneous data sets can be collectively mined
by data fusion. Fusion can focus on a specific target relation and exploit
directly associated data together with contextual data and data about system's
constraints. In the paper we describe a data fusion approach with penalized
matrix tri-factorization (DFMF) that simultaneously factorizes data matrices to
reveal hidden associations. The approach can directly consider any data that
can be expressed in a matrix, including those from feature-based
representations, ontologies, associations and networks. We demonstrate the
utility of DFMF for gene function prediction task with eleven different data
sources and for prediction of pharmacologic actions by fusing six data sources.
Our data fusion algorithm compares favorably to alternative data integration
approaches and achieves higher accuracy than can be obtained from any single
data source alone.


title: Multiscale analysis of 1-rectifiable measures: necessary conditions

abstract:
  We repurpose tools from the theory of quantitative rectifiability to study
the qualitative rectifiability of measures in $\Bbb{R}^n$, $n\geq 2$. To each
locally finite Borel measure $\mu$, we associate a function $\widetilde
J_2(\mu, x)$ which uses a weighted sum to record how closely the mass of $\mu$
is concentrated on a line in the triples of dyadic cubes containing $x$. We
show that $\widetilde J_2(\mu, x) < \infty$ $\mu$-a.e. is a necessary condition
for $\mu$ to give full mass to a countable family of rectifiable curves. This
confirms a conjecture of Peter Jones from 2000. A novelty of this result is
that no assumption is made on the upper Hausdorff density of the measure. Thus
we are able to analyze generic 1-rectifiable measures that are mutually
singular with the 1-dimensional Hausdorff measure.


title:
Novel Factorization Strategies for Higher Order Tensors: Implications
  for Compression and Recovery of Multi-linear Data

abstract:
  In this paper we propose novel methods for compression and recovery of
multilinear data under limited sampling. We exploit the recently proposed
tensor- Singular Value Decomposition (t-SVD)[1], which is a group theoretic
framework for tensor decomposition. In contrast to popular existing tensor
decomposition techniques such as higher-order SVD (HOSVD), t-SVD has optimality
properties similar to the truncated SVD for matrices. Based on t-SVD, we first
construct novel tensor-rank like measures to characterize informational and
structural complexity of multilinear data. Following that we outline a
complexity penalized algorithm for tensor completion from missing entries. As
an application, 3-D and 4-D (color) video data compression and recovery are
considered. We show that videos with linear camera motion can be represented
more efficiently using t-SVD compared to traditional approaches based on
vectorizing or flattening of the tensors. Application of the proposed tensor
completion algorithm for video recovery from missing entries is shown to yield
a superior performance over existing methods. In conclusion we point out
several research directions and implications to online prediction of
multilinear data.


title:
Field-induced magnetic structures in Tb2Ti2O7 spin liquid under field H
  || [111]

abstract:
  We have studied the field-induced magnetic structures of Tb2Ti2O7 pyrochlore
by single-crystal neutron diffraction under a field applied along the [111]
local anisotropy axis, up to H=12T and down to T=40mK. We collected a hundred
magnetic Bragg peaks for each field and temperature value and refined the
magnetic structures with k=0 propagation vector by performing a symmetry
analysis in the space group R-3m, reducing the number of free parameters to
three only. We observe a gradual reorientation of the Tb magnetic moments
towards the field direction, close to a "3-in, 1-out / 1-in, 3-out" spin
structure in the whole field range 0.05-12T. We perform a quantitative
comparison with mean-field calculations and we propose the presence of a
low-temperature dynamic symmetry breaking of the local trigonal symmetry, akin
to a dynamic Jahn-Teller effect, i.e. preserving the overall cubic symmetry. We
discuss the possible origin of this off-diagonal mixing term in the crystal
field hamiltonian in terms of quadrupole-quadrupole interaction or
magneto-elastic effects.


title:
Precision Neutrino Oscillation Measurements using Simultaneous
  High-Power, Low-Energy Project-X Beams

abstract:
  The first phase of the long-baseline neutrino experiment, LBNE10, will use a
broadband, high-energy neutrino beam with a 10-kt liquid argon TPC at 1300 km
to study neutrino oscillation. In this paper, we describe potential upgrades to
LBNE10 that use Project X to produce high-intensity, low-energy neutrino beams.
Simultaneous, high-power operation of 8- and 60-GeV beams with a 200-kt water
Cerenkov detector would provide sensitivity to nu_mu to nu_e oscillations at
the second oscillation maximum. We find that with ten years of data, it would
be possible to measure sin2(2theta_13) with precision comparable to that
expected from reactor antineutrino disappearance and to measure the value of
the CP phase, delta_CP, with an uncertainty of (5-10) degrees. This document is
submitted for inclusion in Snowmass 2013.


title:
Aspects of Current Correlators in Holographic Theories with Hyperscaling
  Violation

abstract:
  We study the low energy and low momentum behavior of current correlators in a
class of holographic zero-temperature finite density critical theories which do
not respect the hyperscaling relation. The dual holographic description is
assumed to be given by probe D-branes embedded in background geometries
characterized by a dynamical critical exponent $z$ and a hyperscaling violation
exponent $\theta$. We show that a subset of these theories with $1\leq
z<2(1-\theta/d)$ exhibit a stable linearly-dispersing mode in their low energy
spectrum of excitations. This mode, which appears as a pole in the retarded
correlators of charge density and longitudinal currents, has some
characteristics similar to that of the zero sound in Fermi liquids. Given some
reasonable assumptions, we argue that the class of theories with $\theta =d-1$
that logarithmically violate the area law in the entanglement entropy in a
manner reminiscent of theories with Fermi surfaces, does \emph {not} exhibit a
zero sound-like mode in the low energy spectrum of the probe sector.
Furthermore, utilizing the holographic Wilsonian approach, we explicitly show
that such a mode has a natural interpretation as a Goldston boson arising from
the spontaneous breaking of a specific symmetry.


title: A new look at instantons and large-N limit

abstract:
  We analyze instantons in the very strongly coupled large-$N$ limit
($N\to\infty$ with $g^2$ fixed) of large-$N$ gauge theories, where the effect
of the instantons remains finite. By using the exact partition function of
four-dimensional ${\cal N}=2^*$ gauge theories as a concrete example, we
demonstrate that each instanton sector in the very strongly coupled large-$N$
limit is related to the one in the 't Hooft limit ($N\to\infty$ with $g^2N$
fixed) through a simple analytic continuation. Furthermore we show the
equivalence between the instanton partition functions of a pair of large-$N$
gauge theories related by an orbifold projection. This can open up a new way to
analyze the partition functions of low/non-supersymmetric theories. We also
discuss implication of our result to gauge/gravity dualities for M-theory as
well as a possible application to large-$N$ QCD.


title: Can One Detect Whether a Wave Function Has Collapsed?

abstract:
  Consider a quantum system prepared in state $\psi$, a unit vector in a
$d$-dimensional Hilbert space. Let $b_1,...,b_d$ be an orthonormal basis and
suppose that, with some probability $0<p<1$, $\psi$ ``collapses,'' i.e., gets
replaced by $b_k$ (possibly times a phase factor) with Born's probability
$|\langle b_k|\psi\rangle|^2$. The question we investigate is: How well can any
quantum experiment on the system determine afterwards whether a collapse has
occurred? The answer depends on how much is known about the initial vector
$\psi$. We provide a number of different results addressing several variants of
the question. In each case, no experiment can provide more than rather limited
probabilistic information. In case $\psi$ is drawn randomly with uniform
distribution over the unit sphere in Hilbert space, no experiment performs
better than a blind guess without measurement; that is, no experiment provides
any useful information.


title:
The basis for design and manufacture of a dsp-based coincidence
  spectrometer

abstract:
  The coincidence technique and the coincidence spectroscopy have been
developed and applied for over 40 years. Most of popular coincidence
measurement systems were based on analog electronics techniques such as time to
amplitude conversion (TAC) or logic selecting coincidence unit. The
above-mentioned systems are relatively cumbersome and complicated to use. With
the strong growth of digital electronics techniques and computational science,
the coincidence measurement systems will be constructed simpler but more
efficient with the sake of application. This article presents the design
principle and signal processing of a simple two-channel coincidence system by a
technique of Digital Signal Processing (DSP) using Field Programmable Gate
Arrays (FPGA) devices at Nuclear Research Institute (NRI), Dalat.


title:
A method for assigning satellite lines to crystallographic sites in rare
  earth crystals

abstract:
  We describe an experimental technique for associating the satellite lines in
a rare earth optical spectrum caused by a defect with the rare earth ions in
crystal sites around that defect. This method involves measuring the hyperfine
splitting caused by a magnetic dipole-dipole interaction between host ions and
a magnetic defect. The method was applied to Ce3+:EuCl3.6H2O to assign 13 of
the outermost 22 satellite lines to sites. The assignments show that the
optical shift of a satellite line is loosely dependent on the distance to the
dopant. The interaction between host and dopant ions is purely dipole-dipole at
distances greater than 7 Angstroms, with an additional contribution, likely
superexchange, at distances less than 7 Angstroms.


title: Multi-Task Policy Search

abstract:
  Learning policies that generalize across multiple tasks is an important and
challenging research topic in reinforcement learning and robotics. Training
individual policies for every single potential task is often impractical,
especially for continuous task variations, requiring more principled approaches
to share and transfer knowledge among similar tasks. We present a novel
approach for learning a nonlinear feedback policy that generalizes across
multiple tasks. The key idea is to define a parametrized policy as a function
of both the state and the task, which allows learning a single policy that
generalizes across multiple known and unknown tasks. Applications of our novel
approach to reinforcement and imitation learning in real-robot experiments are
shown.


title: A survey on Human Mobility and its applications

abstract:
  Human Mobility has attracted attentions from different fields of studies such
as epidemic modeling, traffic engineering, traffic prediction and urban
planning. In this survey we review major characteristics of human mobility
studies including from trajectory-based studies to studies using graph and
network theory. In trajectory-based studies statistical measures such as jump
length distribution and radius of gyration are analyzed in order to investigate
how people move in their daily life, and if it is possible to model this
individual movements and make prediction based on them. Using graph in mobility
studies, helps to investigate the dynamic behavior of the system, such as
diffusion and flow in the network and makes it easier to estimate how much one
part of the network influences another by using metrics like centrality
measures. We aim to study population flow in transportation networks using
mobility data to derive models and patterns, and to develop new applications in
predicting phenomena such as congestion. Human Mobility studies with the new
generation of mobility data provided by cellular phone networks, arise new
challenges such as data storing, data representation, data analysis and
computation complexity. A comparative review of different data types used in
current tools and applications of Human Mobility studies leads us to new
approaches for dealing with mentioned challenges.


title:
Counter-propagating dual-trap optical tweezers based on linear momentum
  conservation

abstract:
  We present a dual-trap optical tweezers setup which directly measures forces
using linear momentum conservation. The setup uses a counter-propagating
geometry, which allows momentum measurement on each beam separately. The
experimental advantages of this setup include low drift due to all-optical
manipulation, and a robust calibration (independent of the features of the
trapped object or buffer medium) due to the force measurement method. Although
this design does not attain the high-resolution of some co-propagating setups,
we show that it can be used to perform different single molecule measurements:
fluctuation-based molecular stiffness characterization at different forces and
hopping experiments on molecular hairpins. Remarkably, in our setup it is
possible to manipulate very short tethers (such as molecular hairpins with
short handles) down to the limit where beads are almost in contact. The setup
is used to illustrate a novel method for measuring the stiffness of optical
traps and tethers on the basis of equilibrium force fluctuations, i.e. without
the need of measuring the force vs molecular extension curve. This method is of
general interest for dual trap optical tweezers setups and can be extended to
setups which do not directly measure forces.

categories: physics.bio-ph cond-mat.stat-mech physics.ins-det q-bio.BM


title:
Some functional equations related to the characterizations of
  information measures and their stability

abstract:
  The main purpose of this paper is to investigate the stability problem of
some functional equations that appear in the characterization problem of
information measures.


title:
A Statistical Test of Walrasian Equilibrium by Means of Complex Networks
  Theory

abstract:
  We represent an exchange economy in terms of statistical ensembles for
complex networks by introducing the concept of market configuration. This is
defined as a sequence of nonnegative discrete random variables $\{w_{ij}\}$
describing the flow of a given commodity from agent $i$ to agent $j$. This
sequence can be arranged in a nonnegative matrix $W$ which we can regard as the
representation of a weighted and directed network or digraph $G$. Our main
result consists in showing that general equilibrium theory imposes highly
restrictive conditions upon market configurations, which are in most cases not
fulfilled by real markets. An explicit example with reference to the e-MID
interbank credit market is provided.


title:
The Gemini NICI Planet-Finding Campaign: The Frequency of Giant Planets
  Around Debris Disk Stars

abstract:
  We have completed a high-contrast direct imaging survey for giant planets
around 57 debris disk stars as part of the Gemini NICI Planet-Finding Campaign.
We achieved median H-band contrasts of 12.4 mag at 0.5" and 14.1 mag at 1"
separation. Follow-up observations of the 66 candidates with projected
separation < 500 AU show that all of them are background objects. To establish
statistical constraints on the underlying giant planet population based on our
imaging data, we have developed a new Bayesian formalism that incorporates (1)
non-detections, (2) single-epoch candidates, (3) astrometric and (4)
photometric information, and (5) the possibility of multiple planets per star
to constrain the planet population. Our formalism allows us to include in our
analysis the previously known Beta Pictoris and the HR 8799 planets. Our
results show at 95% confidence that <13% of debris disk stars have a >5MJup
planet beyond 80 AU, and <21% of debris disk stars have a >3MJup planet outside
of 40 AU, based on hot-start evolutionary models. We model the population of
directly-imaged planets as d^2N/dMda ~ m^alpha a^beta, where m is planet mass
and a is orbital semi-major axis (with a maximum value of amax). We find that
beta < -0.8 and/or alpha > 1.7. Likewise, we find that beta < -0.8 and/or amax
< 200 AU. If we ignore the Beta Pic and HR 8799 planets (should they belong to
a rare and distinct group), we find that < 20% of debris disk stars have a >
3MJup planet beyond 10 AU, and beta < -0.8 and/or alpha < -1.5. Our Bayesian
constraints are not strong enough to reveal any dependence of the planet
frequency on stellar host mass. Studies of transition disks have suggested that
about 20% of stars are undergoing planet formation; our non-detections at large
separations show that planets with orbital separation > 40 AU and planet masses
> 3 MJup do not carve the central holes in these disks.


title:
The Locations of Short Gamma-ray Bursts as Evidence for Compact Object
  Binary Progenitors

abstract:
  We present a detailed investigation of Hubble Space Telescope (HST)
rest-frame UV/optical observations of 22 short gamma-ray burst (GRB) host
galaxies and sub-galactic environments. Utilizing the high angular resolution
and depth of HST, we characterize the host galaxy morphologies, measure precise
projected physical and host-normalized offsets between the bursts and host
centers, and calculate the locations of the bursts with respect to their host
light distributions (rest-frame UV and optical). We calculate a median short
GRB projected physical offset of 4.5 kpc, about 3.5 times larger than that for
long GRBs, and find that ~25% of short GRBs have offsets of >10 kpc. When
compared to their host sizes, the median offset is 1.5 half-light radii (r_e),
about 1.5 times larger than the values for long GRBs, core-collapse supernovae,
and Type Ia supernovae. In addition, ~20% of short GRBs having offsets of >5
r_e, and only ~25% are located within 1 r_e. We further find that short GRBs
severely under-represent their hosts' rest-frame optical and UV light, with
~30-45% of the bursts located in regions of their host galaxies that have no
detectable stellar light, and ~55% in the regions with no UV light. Therefore,
short GRBs do not occur in regions of star formation or even stellar mass. This
demonstrates that the progenitor systems of short GRBs must migrate from their
birth sites to their eventual explosion sites, a signature of kicks in compact
object binary systems. Utilizing the full sample of offsets, we estimate natal
kick velocities of ~20-140 km s^-1. These independent lines of evidence provide
the strongest support to date that short GRBs result from the merger of compact
object binaries (NS-NS/NS-BH).


title:
Improving Dark Energy Constraints with High Redshift Type Ia Supernovae
  from CANDELS and CLASH

abstract:
  Aims. We investigate the degree of improvement in dark energy constraints
that can be achieved by extending Type Ia Supernova (SN Ia) samples to
redshifts z > 1.5 with the Hubble Space Telescope (HST), particularly in the
ongoing CANDELS and CLASH multi-cycle treasury programs.
  Methods. Using the popular CPL parametrization of the dark energy, w = w0
+wa(1-a), we generate mock SN Ia samples that can be projected out to higher
redshifts. The synthetic datasets thus generated are fitted to the CPL model,
and we evaluate the improvement that a high-z sample can add in terms of
ameliorating the statistical and systematic uncertainties on cosmological
parameters.
  Results. In an optimistic but still very achievable scenario, we find that
extending the HST sample beyond CANDELS+CLASH to reach a total of 28 SN Ia at z
> 1.0 could improve the uncertainty in the wa parameter by up to 21%. The
corresponding improvement in the figure of merit (FoM) would be as high as 28%.
Finally, we consider the use of high-redshift SN Ia samples to detect
non-cosmological evolution in SN Ia luminosities with redshift, finding that
such tests could be undertaken by future spacebased infrared surveys using the
James Webb Space Telescope (JWST).


title: Self trapping in the two-dimensional Bose-Hubbard model

abstract:
  We study the expansion of harmonically trapped bosons in a two-dimensional
lattice after suddenly turning off the confining potential. We show that, in
the presence of multiple occupancies per lattice site and strong interactions,
the system exhibits a clear dynamical separation into slowly and rapidly
expanding clouds. We discuss how this effect can be understood within a simple
picture by invoking doublons and Bose enhancement. This picture is corroborated
by an analysis of the momentum distribution function in the regions with slowly
and rapidly expanding bosons.


title:
Massive black hole pairs in clumpy, self-gravitating circumnuclear
  disks: stochastic orbital decay

abstract:
  We study the dynamics of massive black hole pairs in clumpy gaseous
circumnuclear disks. We track the orbital decay of the light, secondary black
hole $M_{\bullet2}$ orbiting around the more massive primary at the center of
the disk, using $N$-body/smoothed particle hydrodynamic simulations. We find
that the gravitational interaction of $M_{\bullet2}$ with massive clumps
$M_{\rm cl}$ erratically perturbs the otherwise smooth orbital decay. In close
encounters with massive clumps, gravitational slingshots can kick the secondary
black hole out of the disk plane. The black hole moving on an inclined orbit
then experiences the weaker dynamical friction of the stellar background,
resulting in a longer orbital decay timescale. Interactions between clumps can
also favor orbital decay when the black hole is captured by a massive clump
which is segregating toward the center of the disk. The stochastic behavior of
the black hole orbit emerges mainly when the ratio $M_{\bullet2}/M_{\rm cl}$
falls below unity, with decay timescales ranging from $\sim1$ to $\sim50$ Myr.
This suggests that describing the cold clumpy phase of the inter-stellar medium
in self-consistent simulations of galaxy mergers, albeit so far neglected, is
important to predict the black hole dynamics in galaxy merger remnants.


title: Future Direct Spectroscopic Detection of Hot Jupiters with IGRINS

abstract:
  With about 700 confirmed extrasolar planets, it is time to move beyond
discovery and towards characterization. Perhaps the most basic parameter of an
extrasolar planet is its mass; however, this is very difficult to determine if
the planet does not transit the star. The radial velocity technique, still the
most fruitful method of discovering planets in the solar neighborhood, can only
determine a minimum planet mass. We investigate a method using the near-future
IGRINS near infrared spectrograph to detect the orbital motion of the planet
itself. We simulate several observations of a star with an orbiting planet, and
search for the spectral signature of the planet by cross-correlating against
planet model spectra. A detection appears as a strong peak in the
cross-correlation function, and gives the radial velocity of the planet at the
time of observation. This, combined with the motion of the star from
traditional radial velocity planet search programs, can determine the actual
planet mass. We find that the IGRINS instrument can detect the spectral
signature from large planets on very close orbits (so-called Hot Jupiters), and
that the detections can provide tight constraints on the true planet mass.


title: Constraints on dark energy with the LOSS SN Ia sample

abstract:
  We present a cosmological analysis of the Lick Observatory Supernova Search
(LOSS) Type Ia supernova (SN Ia) photometry sample introduced by Ganeshalingam
et al. (2010). These SNe provide an effective anchor point to estimate
cosmological parameters when combined with datasets at higher redshift. The
data presented by Ganeshalingam et al. (2010) have been rereduced in the
natural system of the KAIT and Nickel telescopes to minimise systematic
uncertainties. We have run the light-curve-fitting software SALT2 on our
natural-system light curves to measure light-curve parameters for LOSS light
curves and available SN Ia datasets in the literature. We present a Hubble
diagram of 586 SNe in the redshift range z=0.01-1.4 with a residual scatter of
0.176 mag. Of the 226 low-z objects in our sample, 91 objects are from LOSS,
including 45 SNe without previously published distances. Assuming a flat
Universe, we find that the best fit for the dark energy equation-of-state
parameter w = -0.86^+0.13_-0.16 (stat) +- 0.11 (sys) from SNe alone, consistent
with a cosmological constant. Our data prefer a Universe with an accelerating
rate of expansion with 99.999% confidence. When looking at Hubble residuals as
a function of host-galaxy morphology, we do not see evidence for a significant
trend, although we find a somewhat reduced scatter in Hubble residuals from SNe
residing within a projected distance < 10 kpc of the host-galaxy nucleus
(\sigma = 0.156 mag). We find that Hubble residuals do not correlate with the
expansion velocity of Si II \lambda 6355 measured in optical spectra near
maximum light. Our data are consistent with no presence of a local "Hubble
bubble." Improvements in cosmological analyses within low-z samples can be
achieved by better constraining calibration uncertainties in the zero points of
photometric systems.


title:
Impact-parameter dependent Color Glass Condensate dipole model and new
  combined HERA data

abstract:
  The Impact-Parameter dependent Color Glass Condensate (b-CGC) dipole model is
based on the Balitsky-Kovchegov non-linear evolution equation and improves the
Iancu-Itakura-Munier dipole model by incorporating the impact-parameter
dependence of the saturation scale. Here we confront the model to the recently
released high precision combined HERA data and obtain its parameters. The b-CGC
results are then compared to data at small-x for the structure function, the
longitudinal structure function, the charm structure function, exclusive vector
meson (J/\psi, \phi, \rho) production and Deeply Virtual Compton Scattering
(DVCS). We also compare our results with the Impact-Parameter dependent
Saturation model (IP-Sat). We show that most features of inclusive DIS and
exclusive diffractive data, including the Q^2, W, |t| and x dependence are
correctly reproduced in both models. Nevertheless, the b-CGC and the IP-Sat
models give different predictions beyond the current HERA kinematics, namely
for the structure functions at very low x and high virtualities Q^2, and for
the exclusive diffractive vector meson and DVCS production at high t. This can
be traced back to the different power-law behavior of the saturation scale in
x, and to a different impact-parameter b dependence of the saturation scale in
these models. Nevertheless, both models give approximately similar saturation
scale Q_S<1 GeV for the proton in HERA kinematics, and also both models lead to
the same conclusion that the typical impact-parameter probed in the total
\gamma^{*}p cross-section is about b\approx 2\div 3 GeV^{-1}. Our results
provide a benchmark for further investigation of QCD at small-x in heavy ion
collisions at RHIC and the LHC and also at future experiments such as an
Electron-Ion Collider and the LHeC.


title:
Is the CMB telling us that dark matter is weaker than weakly
  interacting?

abstract:
  If moduli, or other long-lived heavy states, decay in the early universe in
part into light and feebly interacting particles (such as axions), these decay
products could account for the additional energy density in radiation that is
suggested by recent measurements of the CMB. These moduli decays will also,
however, alter the expansion history of the early universe, potentially
diluting the thermal relic abundance of dark matter. If this is the case, then
dark matter particles must annihilate with an even lower cross section than
required in the standard thermal scenario (sigma v < 3x10^-26 cm^3/s) if they
are to make up the observed density of dark matter. This possibility has
significant implications for direct and indirect searches for dark matter.


title: Epistemology of Wave Function Collapse in Quantum Physics

abstract:
  Among several possibilities for what reality could be like in view of the
empirical facts of quantum mechanics, one is provided by theories of
spontaneous wave function collapse, the best known of which is the
Ghirardi-Rimini-Weber (GRW) theory. We show mathematically that in GRW theory
(and similar theories) there are limitations to knowledge, that is, inhabitants
of a GRW universe cannot find out all the facts true about their universe. As a
specific example, they cannot accurately measure the number of collapses that a
given physical system undergoes during a given time interval; in fact, they
cannot reliably measure whether one or zero collapses occur. Put differently,
in a GRW universe certain meaningful, factual questions are empirically
undecidable. We discuss several types of limitations to knowledge and compare
them with those in other (no-collapse) versions of quantum mechanics, such as
Bohmian mechanics. Most of our results also apply to observer-induced collapses
as in orthodox quantum mechanics (as opposed to the spontaneous collapses of
GRW theory).


title: Dissipation induced macroscopic entanglement in an open optical lattice

abstract:
  We introduce a method for the dissipative preparation of strongly correlated
quantum states of ultracold atoms in an optical lattice via localized particle
loss. The interplay of dissipation and interactions enables different types of
dynamics. This ushers a new line of experimental methods to maintain the
coherence of a Bose-Einstein condensate or to deterministically generate
macroscopically entangled quantum states.


title:
Theory of a competitive spin liquid state for weak Mott insulators on
  the triangular lattice

abstract:
  We propose a novel quantum spin liquid state that can explain many of the
intriguing experimental properties of the low-temperature phase of the organic
spin liquid candidate materials. This state of paired fermionic spinons
preserves all symmetries of the system, and it has a gapless excitation
spectrum with quadratic bands that touch at momentum ~ k = 0. This quadratic
band touching is protected by the symmetry of the system. Using variational
Monte Carlo techniques, we show that this state has highly competitive energy
in the triangular lattice Heisenberg model supplemented with a realistically
large ring-exchange term.


title: Segre classes as integrals over polytopes

abstract:
  We express the Segre class of a monomial scheme -- or, more generally, a
scheme monomially supported on a set of divisors cutting out complete
intersections -- in terms of an integral computed over an associated body in
euclidean space. The formula is in the spirit of the classical
Bernstein-Kouchnirenko theorem computing intersection numbers of equivariant
divisors in a torus in terms of mixed volumes, but deals with the more refined
intersection-theoretic invariants given by Segre classes, and holds in the less
restrictive context of `r.c. monomial schemes'.


title: A theory of minimal updates in holography

abstract:
  Consider two quantum critical Hamiltonians $H$ and $\tilde{H}$ on a
$d$-dimensional lattice that only differ in some region $\mathcal{R}$. We study
the relation between holographic representations, obtained through real-space
renormalization, of their corresponding ground states $\left.| \psi
\right\rangle$ and $\left.| \tilde{\psi} \right\rangle$. We observe that, even
though $\left.| \psi \right\rangle$ and $\left.| \tilde{\psi} \right\rangle$
disagree significantly both inside and outside region $\mathcal{R}$, they still
admit holographic descriptions that only differ inside the past causal cone
$\mathcal{C}(\mathcal{R})$ of region $\mathcal{R}$, where
$\mathcal{C}(\mathcal{R})$ is obtained by coarse-graining region $\mathcal{R}$.
We argue that this result follows from a notion of directed influence in the
renormalization group flow that is closely connected to the success of Wilson's
numerical renormalization group for impurity problems. At a practical level,
directed influence allows us to exploit translation invariance when describing
a homogeneous system with e.g. an impurity, in spite of the fact that the
Hamiltonian is no longer invariant under translations.


title:
Preparation of Nuclear Spin Singlet States using Spin-Lock Induced
  Crossing

abstract:
  We introduce a broadly applicable technique to create nuclear spin singlet
states in organic molecules and other many-atom systems. We employ a novel
pulse sequence to produce a spin-lock induced crossing (SLIC) of the spin
singlet and triplet energy levels, which enables triplet/singlet polarization
transfer and singlet state preparation. We demonstrate the utility of the SLIC
method by producing a long-lived nuclear spin singlet state on two
strongly-coupled proton pairs in the tripeptide molecule
phenylalanine-glycine-glycine dissolved in D2O, and by using SLIC to measure
the J-couplings, chemical shift differences, and singlet lifetimes of the
proton pairs. We show that SLIC is more efficient at creating nearly-equivalent
nuclear spin singlet states than previous pulse sequence techniques, especially
when triplet/singlet polarization transfer occurs on the same timescale as
spin-lattice relaxation.


title: The lack of star formation gradients in galaxy groups up to z~1.6

abstract:
  In the local Universe, galaxy properties show a strong dependence on
environment. In cluster cores, early type galaxies dominate, whereas
star-forming galaxies are more and more common in the outskirts. At higher
redshifts and in somewhat less dense environments (e.g. galaxy groups), the
situation is less clear. One open issue is that of whether and how the star
formation rate (SFR) of galaxies in groups depends on the distance from the
centre of mass. To shed light on this topic, we have built a sample of X-ray
selected galaxy groups at 0<z<1.6 in various blank fields (ECDFS, COSMOS,
GOODS). We use a sample of spectroscopically confirmed group members with
stellar mass M >10^10.3 M_sun in order to have a high spectroscopic
completeness. As we use only spectroscopic redshifts, our results are not
affected by uncertainties due to projection effects. We use several SFR
indicators to link the star formation (SF) activity to the galaxy environment.
Taking advantage of the extremely deep mid-infrared Spitzer MIPS and
far-infrared Herschel PACS observations, we have an accurate, broad-band
measure of the SFR for the bulk of the star-forming galaxies. We use
multi-wavelength SED fitting techniques to estimate the stellar masses of all
objects and the SFR of the MIPS and PACS undetected galaxies. We analyse the
dependence of the SF activity, stellar mass and specific SFR on the
group-centric distance, up to z~1.6, for the first time. We do not find any
correlation between the mean SFR and group-centric distance at any redshift. We
do not observe any strong mass segregation either, in agreement with
predictions from simulations. Our results suggest that either groups have a
much smaller spread in accretion times with respect to the clusters and that
the relaxation time is longer than the group crossing time.


title: Multichannel Framework for Singular Quantum Mechanics

abstract:
  A multichannel S-matrix framework for singular quantum mechanics (SQM)
subsumes the renormalization and self-adjoint extension methods and resolves
its boundary-condition ambiguities. In addition to the standard channel
accessible to a distant ("asymptotic") observer, one supplementary channel
opens up at each coordinate singularity, where local outgoing and ingoing
singularity waves coexist. The channels are linked by a fully unitary S-matrix,
which governs all possible scenarios, including cases with an apparent
nonunitary behavior as viewed from asymptotic distances.


title:
Centered honeycomb NiSe2 nanoribbons, structure and electronic
  properties

abstract:
  Quasi one-dimensional nanoribbons are excellent candidates for
nanoelectronics, therefore here we investigate by means of density functional
theory the structure and electronic properties of a new kind of 1D ribbons,
namely: centered honeycomb NiSe2 nanoribbons. Depending on the crystallography
and atomic composition of the edges, these ribbons can belong to one of six
(two) zigzag (armchair) families. In the zigzag families, after edge
reconstruction, all the bare ribbons are metallic. The influence of edge
hydrogen passivation produces band gaps in two of the six families. For the
armchair nanoribbons, the geometrical reconstruction leads to semiconductors
with small band gap and the hydrogen passivation of the edges increases the
band gap up to ~0.6 eV.


title: Strong equivalence of reversible circuits is coNP-complete

abstract:
  It is well-known that deciding equivalence of logic circuits is a
coNP-complete problem. As a corollary, the problem of deciding weak equivalence
of reversible circuits, i.e. ignoring the ancilla bits, is also coNP-complete.
The complexity of deciding strong equivalence, including the ancilla bits, is
less obvious and may depend on gate set. Here we use Barrington's theorem to
show that deciding strong equivalence of reversible circuits built from the
Fredkin gate is coNP-complete. This implies coNP-completeness of deciding
strong equivalence for other commonly used universal reversible gate sets,
including any gate set that includes the Toffoli or Fredkin gate.


title:
Transversalit\'e quantitative en g\'eom\'etrie symplectique :
  sous-vari\'et\'es et hypersurfaces

abstract:
  Le th\'eor\`eme principal de cet article est un r\'esultat de
transversalit\'e quantitative relatif \`a une sous-vari\'et\'e.
  The main theorem of this paper is a result of estimated transversality with
respect to a given submanifold.


title:
Non-volatile ferroelastic switching of the Verwey transition and
  resistivity of epitaxial Fe3O4/PMN-PT (011)

abstract:
  A central goal of electronics based on correlated materials or 'Mottronics'
is the ability to switch between distinct collective states with a control
voltage. Small changes in structure and charge density near a transition can
tip the balance between competing phases, leading to dramatic changes in
electronic and magnetic properties. In this work, we demonstrate that an
electric field induced two-step ferroelastic switching pathway in (011)
oriented 0.71Pb(Mg1/3Nb2/3)O3-0.29PbTiO3 (PMN-PT) substrates can be used to
tune the Verwey metal-insulator transition in epitaxial Fe3O4 films in a stable
and reversible manner. We also observe robust non-volatile resistance switching
in Fe3O4 up to room temperature, driven by ferroelastic strain. These results
provides a framework for realizing non-volatile and reversible tuning of order
parameters coupled to lattice-strain in epitaxial oxide heterostructures over a
broad range of temperatures, with potential device applications.


title:
Correlated parity measurements as a probe of non-abelian statistics in
  1D superconducting wires

abstract:
  We propose a method to detect a signature of non-abelian statistics in a 1D
superconducting wire by tuning the effective coupling between a pair of
Majorana particles. Our experiment requires a single wire with two segments in
the topological superconducting phase, and a total of 4 Majorana particles. We
show that an appropriately timed "pulse" in the coupling between the two middle
Majoranas leads to a coherent rotation of the two q-bits associated with the
pairs of Majoranas in the two TSC segments, in much the same way that an
appropriate-length pulse of a transverse magnetic field can be used to rotate
spins in NMR. This can be exploited both to probe the correlations of the
Majoranas, and to manipulate the Majorana q-bits, in these 1D wires. We discuss
the experimental requirements for such a coherent rotation to be observable
when the wire system is coupled to a fermionic bath.


title: Pion Electroproduction and VCS at the \Delta(1232) Resonance Region

abstract:
  The study of the $\gamma^* N\rightarrow \Delta$ reaction presents the best
quantitative method to explore the deviation of hadron shapes from spherical
symmetry (nonspherical amplitudes). Significant non-spherical electric (E2) and
Coulomb quadrupole (C2) amplitudes have been observed with good precision as a
function of $Q^2$ from photon point up to $\approx 7 ~(GeV/c)^2$. Quark model
calculations for these quadrupole amplitudes are at least an order of magnitude
too small and even have the wrong sign. Lattice QCD, chiral effective field
theory, and dynamic model calculations which include the effects of the
pion-cloud are in approximate agreement with experiment.


title:
Comparing various regression methods on ensemble strategies in
  differential evolution

abstract:
  Differential evolution possesses a multitude of various strategies for
generating new trial solutions. Unfortunately, the best strategy is not known
in advance. Moreover, this strategy usually depends on the problem to be
solved. This paper suggests using various regression methods (like random
forest, extremely randomized trees, gradient boosting, decision trees, and a
generalized linear model) on ensemble strategies in differential evolution
algorithm by predicting the best differential evolution strategy during the
run. Comparing the preliminary results of this algorithm by optimizing a suite
of five well-known functions from literature, it was shown that using the
random forest regression method substantially outperformed the results of the
other regression methods.


title: Wavefunction reality, indeterminate properties and degrees of presence

abstract:
  The degree-of-presence (of the quantum system) concept, accompanying that of
the wavefunction-reality postulate, is introduced and studied in two ways. To
begin with, an incomplete exposition of the present author's views is given.
Subsequently, a short historical and philosophical review of answers to the
question about the meaning of indeterminate individual-system probabilities is
presented from the literature. It is done in the form of a carefully selected
collage of quotations mostly with polemic comments by the present author and
with further elaboration of his point of view. The advocated notion of 'degree
of presence' generalizes the intuitively most easily acceptable idea of
'delocalization' in (roughly called)wavelike behavior of a quantum system.


title: New bounds for the distance Ramsey number

abstract:
  In this paper we study the distance Ramsey number $R_{{\it D}}(s,t,d)$. The
\textit{distance Ramsey number} $R_{{\it D}}(s,t,d) $ is the minimum number $n$
such that for any graph $ G $ on $ n $ vertices, either $G$ contains an induced
$ s $-vertex subgraph isomorphic to a distance graph in $ \Real^d $ or $ \bar
{G} $ contains an induced $ t $-vertex subgraph isomorphic to the distance
graph in $ \Real^d $. We obtain the upper and lower bounds on $R_{{\it
D}}(s,s,d),$ which are similar to the bounds for the classical Ramsey number
$R(\lceil \frac{s}{[d/2]} \rceil, \lceil \frac{s}{[d/2]} \rceil)$.


title: Making massive probabilistic databases practical

abstract:
  Existence of incomplete and imprecise data has moved the database paradigm
from deterministic to proba- babilistic information. Probabilistic databases
contain tuples that may or may not exist with some probability. As a result,
the number of possible deterministic database instances that can be observed
from a probabilistic database grows exponentially with the number of
probabilistic tuples. In this paper, we consider the problem of answering both
aggregate and non-aggregate queries on massive probabilistic databases. We
adopt the tuple independence model, in which each tuple is assigned a
probability value. We develop a method that exploits Probability Generating
Functions (PGF) to answer such queries efficiently. Our method maintains a
polynomial for each tuple. It incrementally builds a master polynomial that
expresses the distribution of the possible result values precisely. We also
develop an approximation method that finds the distribution of the result value
with negligible errors. Our experiments suggest that our methods are orders of
magnitude faster than the most recent systems that answer such queries,
including MayBMS and SPROUT. In our experiments, we were able to scale up to
several terabytes of data on TPC- H queries, while existing methods could only
run for a few gigabytes of data on the same queries.