pinecone/core-2020-05-10-deduplication huggingface dataset:
Semantic Abilities in Children With Pragmatic Language Impairment: The Case of Picture Naming Skills

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                  99697.pdf (publisher's version ) (Open Access)Purpose: The semantic abilities of children with pragmatic language impairment (PLI) are subject to debate. The authors investigated picture naming and definition skills in 5-year-olds with PLI in comparison to typically developing children.
Method: 84 children with PLI and 80 age-matched typically developing children completed receptive vocabulary, picture naming, and definition tasks.
Results: The PLI group scored lower on the receptive vocabulary and picture naming tasks. Word length and frequency affected naming accuracy in both groups. Children with PLI showed higher numbers of semantic errors, nonrelated errors, and omissions and circumlocutions. The error-type distribution differed between groups: PLI children showed disproportionate levels of nonrelated errors. In the definition task, PLI children showed lower information accuracy for accurately named pictures and comparable accuracy for incorrectly named pictures. Qualitative analysis suggested a high incidence of pragmatically inappropriate definitions for the PLI group. Naming accuracy for both groups improved equally after giving semantic cues.
Conclusions: These findings suggest a deficit in object identification and/or naming selection. It might be premature to conclude that children with PLI show normal semantic abilities. The results are largely consistent with a general language delay; however, there is also some evidence of a qualitative difference between both groups
Early east Antarctic ice sheet growth recorded in the landscape of the Gamburtsev Subglacial Mountains.

The Gamburtsev Subglacial Mountains are regarded as a key nucleation site for the Antarctic Ice Sheet and they retain a unique long-term record of pre-glacial and early glacial landscape evolution. Here, we use a range of morphometric analyses to constrain the nature of early glaciation and subsequent ice sheet evolution in the interior of East Antarctica, using a new digital elevation model of the Gamburtsev Subglacial Mountains, derived from an extensive airborne radar survey. We find that an inherited fluvial landscape confirms the existence of the Gamburtsev Subglacial Mountains prior to the onset of glaciation at the Eocene–Oligocene climate boundary (ca. 34 Ma). Features characteristic of glaciation, at a range of scales, are evident across the mountains. High elevation alpine valley heads, akin to cirques, identified throughout the mountains, are interpreted as evidence for early phases of glaciation in East Antarctica. The equilibrium line altitudes associated with these features, combined with information from fossil plant assemblages, suggest that they formed at, or prior to, 34 Ma. It cannot be ruled out that they may have been eroded by ephemeral ice between the Late Cretaceous and the Eocene (100–34 Ma). Hanging valleys, overdeepenings, truncated spurs and steep-sided, linear valley networks are indicative of a more widespread alpine glaciation in this region. These features represent ice growth at, or before, 33.7 Ma and provide a minimum estimate for the scale of the East Antarctic Ice Sheet between ca. 34 and 14 Ma, when dynamic fluctuations in ice extent are recorded at the coast of Antarctica. The implications are that the early East Antarctic Ice Sheet grew rapidly and developed a cold-based core that preserved the alpine landscape. The patterns of landscape evolution identified provide the earliest evidence for the development of the East Antarctic Ice Sheet and can be used to test coupled ice–climate evolution models
Flavor Changing Neutral Currents in the Lee-Wick Standard Model

Recently an extension of the standard model (the Lee-Wick standard model)
based on ideas of Lee and Wick (LW) was introduced. It does not contain
quadratic divergences in the Higgs mass and hence solves the hierarchy puzzle.
The LW-standard model contains new heavy LW-resonances at the TeV scale that
decay to ordinary particles. In this paper we examine in more detail the flavor
structure of the theory. We integrate out the heavy LW-fermions at tree level
and find that this induces flavor changing Z boson couplings. However, these
flavor changing neutral currents are acceptably small since they are
automatically suppressed by small Yukawa couplings. This is the case even
though the theory does not satisfy the principle of minimal flavor violation.
New couplings of the charged W bosons to quarks and leptons are also induced.
We also integrate out the LW-Higgs and examine the four-fermion operators
induced.Comment: 13 pages, 2 figure
Global properties of causal wedges in asymptotically AdS spacetimes.

We examine general features of causal wedges in asymptotically AdS space-times and show that in a wide variety of cases they have non-trivial topology. We also prove some general results regarding minimal area surfaces on the causal wedge boundary and thereby derive constraints on the causal holographic information. We go on to demonstrate that certain properties of the causal wedge impact significantly on features of extremal surfaces which are relevant for computation of holographic entanglement entropy
Gauge theories from D7-branes over vanishing 4-cycles.

We study quiver gauge theories on D7-branes wrapped over vanishing holomorphic 4-cycles. We investigate how to incorporate O7-planes and/or flavor D7-branes, which are necessary to cancel anomalies. These theories are chiral, preserve four supercharges and exhibit very rich infrared dynamics. Geometric transitions and duality in the presence of O-planes are analyzed. We study the Higgs branch of these quiver theories, showing the emergence of fuzzy internal dimensions. This branch is related to noncommutative instantons on the divisor wrapped by the seven-branes. Our results have a natural application to the recently introduced F(uzz) limit of F-theory
Detection of very-high energy gamma-ray emission from NGC 1275 by the MAGIC telescopes\ud

We report on the detection of very-high energy (VHE, E > 100 GeV) gamma-ray emission from NGC 1275, the central radio galaxy of the Perseus cluster of galaxies. The source has been detected by the MAGIC telescopes with a statistical significance of 6.6s above 100 GeV in 46 h of stereo observations carried out between August 2010 and February 2011. The measured differential energy spectrum between 70 GeV and 500 GeV can be described by a power law with a steep spectral index of Gamma = -4.1 +/- 0.7(stat) +/- 0.3(syst), and the average flux above 100 GeV is F-gamma = (1.3 +/- 0.2(stat) +/- 0.3(syst)) x 10(-11) cm(-2) s(-1). These results, combined with the power-law spectrum measured in the first two years of observations by the Fermi-LAT above 100 MeV, with a spectral index of Gamma similar or equal to -2.1, strongly suggest the presence of a break or cut-off around tens of GeV in the NGC 1275 spectrum. The light curve of the source above 100 GeV does not show hints of variability on a month time scale. Finally, we report on the nondetection in the present data of the radio galaxy IC 310, previously discovered by the Fermi-LAT and MAGIC. The derived flux upper limit F-gamma(U.L.) (> 300 GeV) = 1.2 x 10(-12) cm(-2) s(-1) is a factor similar to 3 lower than the mean flux measured by MAGIC between October 2009 and February 2010, thus confirming the year time-scale variability of the source at VHE.\u
Gravitino Dark Matter and the Flavour Structure of R-violating Operators

We study gravitino dark matter and slow gravitino decays within the framework
of R-violating supersymmetry, with particular emphasis on the flavour
dependence of the branching ratios and the allowed R-violating couplings. The
dominant decay modes and final state products turn out to be very sensitive to
the R-violating hierarchies. Mixing effects can be crucial in correctly
deriving the relative magnitude of the various contributions, particularly for
heavy flavours with phase space suppression. The study of the strength of
different decay rates for the gravitino is also correlated to collider
signatures expected from decays of the Next-to-Lightest Supersymmetric Particle
(NLSP) and to single superparticle production.Comment: 20 pages, 7 figures; v2 also includes photons from three-body decays
  in coupling limits, one additional author, matches version to appear in PL
Non-standard neutrino interactions in the Zee-Babu model

We investigate non-standard neutrino interactions (NSIs) in the Zee--Babu
model. The size of NSIs predicted by this model is obtained from a full scan
over the parameter space, taking into account constraints from low-energy
experiments such as searches for lepton flavor violation (LFV) and the
requirement to obtain a viable neutrino mass matrix. The dependence on the
scale of new physics as well as on the type of the neutrino mass hierarchy is
discussed. We find that NSIs at the source of a future neutrino factory may be
at an observable level in the nu_e to nu_tau and/or nu_mu to nu_tau channels.
In particular, if the doubly charged scalar of the model has a mass in reach of
the LHC and if the neutrino mass hierarchy is inverted, a highly predictive
scenario is obtained with observable signals at the LHC, in upcoming neutrino
oscillation experiments, in LFV processes, and for NSIs at a neutrino factory.Comment: 9 pages, 4 figure
Measuring the Integrated Sachs-Wolfe Effect

One of the main challenges of modern cosmology is to understand the nature of
dark energy. The Integrated Sachs-Wolfe (ISW) effect is sensitive to dark
energy and presents an independent signature of dark energy in the absence of
modified gravity and curvature. The ISW effect occurs on large scales, where
cosmic variance is high and where there are large amounts of missing data in
the CMB and large scale structure maps due to Galactic confusion. Moreover,
existing methods in the literature often make strong assumptions about the
statistics of the underlying fields or estimators. Together these effects can
severely limit signal extraction. We review literature on the ISW effect,
comparing statistical subtleties between existing methods, and identifying
several limitations. We propose a novel method to detect and measure the ISW
signal. This method assumes only that the primordial CMB field is Gaussian. It
is based on a sparse inpainting method to reconstruct missing data and uses a
bootstrap technique to avoid assumptions about the statistics of the estimator.
It is a complete method, using three complementary statistical methods. We
apply our method to Euclid-like simulations and show we can expect a \sim
7\sigma model-independent detection of the ISW signal with WMAP7-like data,
even with missing data. Other tests return \sim 4.7\sigma detection levels for
a Euclid-like survey, with levels independent from whether the galaxy field is
normally or lognormally distributed. We apply our method to the 2 Micron All
Sky Survey (2MASS) and WMAP7 CMB data and find detections in the 1.1 -
2.0\sigma range, as expected from simulations. As a by-product, we reconstruct
the full-sky temperature ISW field due to 2MASS data. We have presented a novel
technique, based on sparse inpainting and bootstrapping, which accurately
detects and reconstructs the ISW effect.Comment: Accepted for publication in AA. Added discussion and simulations for
  a Euclid-like surve
Measurement of the $W$ Charge Asymmetry in the $W \rightarrow \mu\nu$
  Decay Mode in $pp$ Collisions at $\sqrt{s} = 7$ TeV with the ATLAS detector

This letter reports a measurement of the muon charge asymmetry from $W$
bosons produced in proton-proton collisions at a centre-of-mass energy of 7 TeV
with the ATLAS experiment at the LHC. The asymmetry is measured in the $W
\rightarrow \mu\nu$ decay mode as a function of the muon pseudorapidity using a
data sample corresponding to a total integrated luminosity of 31 pb$^{-1}$. The
results are compared to predictions based on next-to-leading order calculations
with various parton distribution functions. This measurement provides
information on the $u$ and $d$ quark momentum fractions in the proton.Comment: 22 pages in total, author list starting from page 10, 4 figure, 3
  tables, final version published in Phys. Lett. B. All figures including
  auxiliary figures are available at
  https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2010-16
Scalar and pseudoscalar Higgs production in association with a
  top-antitop pair

We present the calculation of scalar and pseudoscalar Higgs production in
association with a top-antitop pair to the next-to-leading order (NLO) accuracy
in QCD, interfaced with parton showers according to the MC@NLO formalism. We
apply our results to the cases of light and very light Higgs boson production
at the LHC, giving results for total rates as well as for sample differential
distributions, relevant to the Higgs, to the top quarks, and to their decay
products. This work constitutes the first phenomenological application of
aMC@NLO, a fully automated approach to complete event generation at NLO in QCD.Comment: 15 pages, 8 figures, published version. (2 references added, improved
  description of the decay of the top and Higgs bosons
Phonon-assisted luminescence of magnetoexcitons in semiconductor quantum
  wells

We consider a line-shape of magnetoexciton photoluminescence from quantum
wells when the disorder is sufficiently small. In this case the phonon-assisted
optical transitions become important for the line formation. We study both
inter-band and intra-band excitons. For inter-band excitons the width of a
single peak emission line is calculated as a function of temperature and
quantum well width. For intra-band excitons the double peak of the emission
line is predicted when the electron filling factor is odd and greater or equal
to three. In the latter case the lowest magnetoexciton dispersion curve has a
minimum at non-zero momentum. Then the higher-energy peak results from the
direct optical emission of zero-momentum excitons. The origin of the
lower-energy peak is the phonon-assisted transitions from the non-zero momentum
exciton states. With increasing temperature, the higher-energy peak becomes
more pronounced and the lower-energy peak vanishes.Comment: 4 pages, 2 figure
Low-temperature dynamics of weakly localized Frenkel excitons in
  disordered linar chains

We calculate the temperature dependence of the fluorescence Stokes shift and
the fluorescence decay time in linear Frenkel exciton systems resulting from
the thermal redistribution of exciton population over the band states. The
following factors, relevant to common experimental conditions, are accounted
for in our kinetic model: (weak) localization of the exciton states by static
disorder, coupling of the localized excitons to vibrations in the host medium,
a possible non-equilibrium of the subsystem of localized Frenkel excitons on
the time scale of the emission process, and different excitation conditions
(resonant or non resonant). A Pauli master equation, with microscopically
calculated transition rates, is used to describe the redistribution of the
exciton population over the manifold of localized exciton states. We find a
counterintuitive non-monotonic temperature dependence of the Stokes shift. In
addition, we show that depending on experimental conditions, the observed
fluorescence decay time may be determined by vibration-induced intra-band
relaxation, rather than radiative relaxation to the ground state. The model
considered has relevance to a wide variety of materials, such as linear
molecular aggregates, conjugated polymers, and polysilanes.Comment: 15 pages, 8 figure
Power law load dependence of atomic friction

We present a theoretical study of the dynamics of a tip scanning a graphite
surface as a function of the applied load. From the analysis of the lateral
forces, we extract the friction force and the corrugation of the effective
tip-surface interaction potential. We find both the friction force and
potential amplitude to have a power law dependence on applied load with
exponent $\sim 1.6$. We interpret these results as characteristic of sharp
undeformable tips in contrast to the case of macroscopic and elastic
microscopic contacts.Comment: 4 pages, 4 figure
Pair correlation functions and phase separation in a two component point
  Yukawa fluid

We investigate the structure of a binary mixture of particles interacting via
purely repulsive (point) Yukawa pair potentials with a common inverse screening
length $\lambda$. Using the hyper-netted chain closure to the Ornstein-Zernike
equations, we find that for a system with `ideal' (Berthelot mixing rule) pair
potential parameters for the interaction between unlike species, the asymptotic
decay of the total correlation functions crosses over from monotonic to damped
oscillatory on increasing the fluid total density at fixed composition. This
gives rise to a Kirkwood line in the phase diagram. We also consider a
`non-ideal' system, in which the Berthelot mixing rule is multiplied by a
factor $(1+\delta)$. For any $\delta>0$ the system exhibits fluid-fluid phase
separation and remarkably the ultimate decay of the correlation functions is
now monotonic for all (mixture) state points. Only in the limit of vanishing
concentration of either species does one find oscillatory decay extending to $r
= \infty$. In the non-ideal case the simple random phase approximation provides
a good description of the phase separation and the accompanying Lifshitz line.Comment: 11 pages, 6 figures. Accepted for publication in J. Chem. Phy
Dual curvature tensors and dynamics of gravitomagnetic matter

Gravitomagnetic charge that can also be referred to as the {\it dual mass} or
{\it magnetic mass} is the topological charge in gravity theory. A
gravitomagnetic monopole at rest can produce a stationary gravitomagnetic
field. Due to the topological nature of gravitomagnetic charge, the metric of
spacetime where the gravitomagnetic matter is present will be nonanalytic. In
this paper both the dual curvature tensors (which can characterize the dynamics
of gravitational charge/monopoles) and the antisymmetric gravitational field
equation of gravitomagnetic matter are presented. We consider and discuss the
mathematical formulation and physical properties of the dual curvature tensors
and scalar, antisymmetric source tensors, dual spin connection (including the
low-motion weak-field approximation), dual vierbein field as well as dual
current densities of gravitomagnetic charge. It is shown that the dynamics of
gravitomagnetic charge can be founded within the framework of the above dual
quantities. In addition, the dual relationship between the dynamical theories
of gravitomagnetic charge (dual mass) and gravitoelectric charge (mass) is also
taken into account in the present paper.Comment: 20 pages, Latex (There are some minor revisions made to the published
  paper
Non-minimal Wu-Yang monopole

We discuss new exact spherically symmetric static solutions to non-minimally
extended Einstein-Yang-Mills equations. The obtained solution to the Yang-Mills
subsystem is interpreted as a non-minimal Wu-Yang monopole solution. We focus
on the analysis of two classes of the exact solutions to the gravitational
field equations. Solutions of the first class belong to the
Reissner-Nordstr{\"o}m type, i.e., they are characterized by horizons and by
the singularity at the point of origin. The solutions of the second class are
regular ones. The horizons and singularities of a new type, the non-minimal
ones, are indicated.Comment: 10 pages, no figures, typos correcte
The action operator for continuous-time histories

We define the action operator in the consistent histories formalism, as the
quantum analogue of the classical action functional, for the simple harmonic
oscillator case. The action operator is shown to be the generator of time
transformations, and to be associated with the two types of time-evolution of
the standard quantum theory: the wave-packet reduction and the unitary
time-evolution. We construct the corresponding classical histories and
demonstrate the relevance with the quantum histories. Finally, we show the
relation of the action operator to the decoherence functional.Comment: 26 pages, 1 figure, LaTEX ; discussion extended and clarified,
  presentation of arguments made more explicit, minor errors correcte
Diquarks and antiquarks in exotics: a menage a trois and a menage a
  quatre

A menage a trois is very different from an ordinary family. Similarly, exotic
hadrons with both qq and qbar q pairs have important color-space correlations
that are completely absent in ordinary mesons and baryons. The presence of both
types of pairs requires attention to the basic QCD physics that the q qbar
interaction is much stronger than the qq interaction. This new physics in
multiquark systems produces color structures totally different from those of
normal hadrons, for example the ud system is utterly unlike the ud diquark in
the uds Lambda baryon. The color-space correlations produce unusual
experimental properties in tetraquarks with heavy quark pairs which may be
relevant for newly discovered mesons like the X(3872) resonance. Tetraquark
masses can be below the two-meson threshold for sufficiently high quark masses.
A simple model calculation shows the b q bbar ubar and b q cbar qbar
tetraquarks below the B Bbar and B Dbar thresholds. Some of these states have
exotic electric charge and their decays might have striking signatures
involving monoenergetic photons and/or pions.Comment: Journal version (PLB
Orbit Approach to Separation of Variables in sl(3)-Related Integrable
  Systems

Using the orbit method we attempt to reveal geometric and algebraic meaning
of separation of variables for the integrable systems on coadjoint orbits in an
$\mathfrak{sl}(3)$ loop algebra. We consider two types of generic orbits
embedded into a common manifold, endowed with two nonsingular Lie-Poisson
brackets. We prove that separation of variables on orbits of both types is
realized by the same variables of separation. We also construct the integrable
systems on these orbits: a coupled 3-component nonlinear Schr\"{o}dinger
equation and an isotropic SU(3) Landau-Lifshitz equation.Comment: 20 page
Optical Modulation in the X-Ray Binary 4U 1543-624 Revisited

The X-ray binary 4U 1543$-$624 has been provisionally identified as an
ultracompact system with an orbital period of $\simeq$18~min. We have carried
out time-resolved optical imaging of the binary to verify the ultra-short
orbital period. Using 140\,min of high-cadence $r'$-band photometry we recover
the previously-seen sinusoidal modulation and determine a period
$P=18.20\pm0.09$\,min. In addition, we also see a 7.0$\times
10^{-4}$\,mag\,min$^{-1}$ linear decay, likely related to variations in the
source's accretion activity. Assuming that the sinusoidal modulation arises
from X-ray heating of the inner face of the companion star, we estimate a
distance of 6.0--6.7\,kpc and an inclination angle of
34$^{\circ}$--61$^{\circ}$ (90\% confidence) for the binary. Given the
stability of the modulation we can confirm that the modulation is orbital in
origin and 4U 1543$-$624 is an ultracompact X-ray binary.Comment: 6 pages, 3 figures, accepted for publication in Publications of the
  Astronomical Society of Australia (PASA