pinecone/core-2020-05-10-deduplication huggingface dataset:
A coordinated optical and X-ray spectroscopic campaign on HD179949:
  searching for planet-induced chromospheric and coronal activity

HD179949 is an F8V star, orbited by a close-in giant planet with a period of
~3 days. Previous studies suggested that the planet enhances the magnetic
activity of the parent star, producing a chromospheric hot spot which rotates
in phase with the planet orbit. However, this phenomenon is intermittent since
it was observed in several but not all seasons. A long-term monitoring of the
magnetic activity of HD179949 is required to study the amplitude and time
scales of star-planet interactions. In 2009 we performed a simultaneous optical
and X-ray spectroscopic campaign to monitor the magnetic activity of HD179949
during ~5 orbital periods and ~2 stellar rotations. We analyzed the CaII H&K
lines as a proxy for chromospheric activity, and we studied the X-ray emission
in search of flux modulations and to determine basic properties of the coronal
plasma. A detailed analysis of the flux in the cores of the CaII H&K lines and
a similar study of the X-ray photometry shows evidence of source variability,
including one flare. The analysis of the the time series of chromospheric data
indicates a modulation with a ~11 days period, compatible with the stellar
rotation period at high latitudes. Instead, the X-ray light curve suggests a
signal with a period of ~4 days, consistent with the presence of two active
regions on opposite hemispheres. The observed variability can be explained,
most likely, as due to rotational modulation and to intrinsic evolution of
chromospheric and coronal activity. There is no clear signature related to the
orbital motion of the planet, but the possibility that just a fraction of the
chromospheric and coronal variability is modulated with the orbital period of
the planet, or the stellar-planet beat period, cannot be excluded. We conclude
that any effect due to the presence of the planet is difficult to disentangle
Supersymmetric Hybrid Inflation with Non-Minimal Kahler potential

Minimal supersymmetric hybrid inflation based on a minimal Kahler potential
predicts a spectral index n_s\gsim 0.98. On the other hand, WMAP three year
data prefers a central value n_s \approx 0.95. We propose a class of
supersymmetric hybrid inflation models based on the same minimal superpotential
but with a non-minimal Kahler potential. Including radiative corrections using
the one-loop effective potential, we show that the prediction for the spectral
index is sensitive to the small non-minimal corrections, and can lead to a
significantly red-tilted spectrum, in agreement with WMAP.Comment: 14 pages, 5 figures; footnote and reference adde
A Near-Infrared Spectroscopic Study of Young Field Ultracool Dwarfs

We present a near-infrared (0.9-2.4 microns) spectroscopic study of 73 field
ultracool dwarfs having spectroscopic and/or kinematic evidence of youth
(~10-300 Myr). Our sample is composed of 48 low-resolution (R~100) spectra and
41 moderate-resolution spectra (R>~750-2000). First, we establish a method for
spectral typing M5-L7 dwarfs at near-IR wavelengths that is independent of
gravity. We find that both visual and index-based classification in the near-IR
provide consistent spectral types with optical spectral types, though with a
small systematic offset in the case of visual classification at J and K band.
Second, we examine features in the spectra of ~10 Myr ultracool dwarfs to
define a set of gravity-sensitive indices based on FeH, VO, K, Na and H-band
continuum shape. We then create an index-based method for classifying the
gravities of M6-L5 dwarfs that provides consistent results with gravity
classifications from optical spectroscopy. Our index-based classification can
distinguish between young and dusty objects. Guided by the resulting
classifications, we propose a set of low-gravity spectral standards for the
near-IR. Finally, we estimate the ages corresponding to our gravity
classifications.Comment: Published in ApJ. IDL program for calculating indices
  (allers13_index.pro) included in the source gzipped ta
Quasinormal Quantization in deSitter Spacetime

A scalar field in four-dimensional deSitter spacetime (dS_4) has quasinormal
modes which are singular on the past horizon of the south pole and decay
exponentially towards the future. These are found to lie in two complex
highest-weight representations of the dS_4 isometry group SO(4,1). The
Klein-Gordon norm cannot be used for quantization of these modes because it
diverges. However a modified `R-norm', which involves reflection across the
equator of a spatial S^3 slice, is nonsingular. The quasinormal modes are shown
to provide a complete orthogonal basis with respect to the R-norm. Adopting the
associated R-adjoint effectively transforms SO(4,1) to the symmetry group
SO(3,2) of a 2+1-dimensional CFT. It is further shown that the conventional
Euclidean vacuum may be defined as the state annihilated by half of the
quasinormal modes, and the Euclidean Green function obtained from a simple mode
sum. Quasinormal quantization contrasts with some conventional approaches in
that it maintains manifest dS-invariance throughout. The results are expected
to generalize to other dimensions and spins.Comment: 23 pages. v2: minor edits, matches published versio
Production and decays of a light $\phi^0$ in the LRTH model under the
  LHC Higgs data

In this paper we study the production and decays of a light pseudoscalar
boson $\phi^0$ with $m_{\phi^0} \leq m_h/2$ appeared in the left-right twin
Higgs (LRTH) model, and explore its phenomenological consequences when the
latest LHC Higgs data are taken into account. We found that (a) the decay rate
$Br(h\to \phi^0\phi^0)$ can be as large as $80\%$ and can suppress
significantly the visible $\gamma\gamma$ signal rate, but the latest LHC Higgs
data put a strong constraint on it: $Br(h \to \phi^0\phi^0) \leq 30\%$ at
$3\sigma$ level; (b) the $p$-value of the LRTH model is around $0.6$, smaller
than that of the SM in most of the parameter space and approaches the SM value
$0.8$ for a sufficiently large $f$ parameter; (c) the neutral pseudoscalar
$\phi^0$ dominantly decay into $b\bar{b}$ and the decay rate $Br(\phi^0\to
b\bar{b})$ can be larger than $80\%$ for $m_{\phi^0}\leq 60$ GeV, and the
second main decay mode is $\phi^0\to \tau^{+}\tau^{-}$ with a branching ratio
about $14\%$; and (d) at the future $e^-e^+$ collider with $\sqrt{s}=250$ GeV,
the processes $e^{+}e^{-}\to Zh\to Z(\phi^0\phi^0)\to Z(4b,2b2\tau)$ are
promising for discovering such a light pseudoscalar $\phi^0$
WINGS-SPE III: Equivalent width measurements, spectral properties and
  evolution of local cluster galaxies

[Abridged] We investigate the frequency of the various spectral types as a
function both of the clusters' properties and of the galaxies' characteristics.
In this way, using the same classification criteria adopted for higher redshift
studies, we can consistently compare the properties of the local cluster
population to those of their more distant counterparts. We describe a method we
have developed to automatically measure the equivalent width of spectral lines
in a robust way even in spectra with a non optimal signal to noise. Like this,
we can derive a spectral classification reflecting the stellar content, based
on the presence and strength of the [OII] and Hdelta lines. We are able to
measure 4381 of the ~6000 originally observed spectra, in the fields of 48
clusters, 2744 of which are spectroscopically confirmed cluster members. The
spectral classification is then analyzed as a function of galaxies' luminosity,
stellar mass, morphology, local density and host cluster's global properties,
and compared to higher redshift samples (MORPHS and EDisCS). The vast majority
of galaxies in the local clusters population are passive objects, being also
the most luminous and massive. At a magnitude limit of Mv<-18, galaxies in a
post-starburst phase represent only ~11% of the cluster population and this
fraction is reduced to ~5% at Mv<-19.5, which compares to the 18% at the same
magnitude limit for high-z clusters. "Normal" star forming galaxies [e( c )]
are proportionally more common in local clusters. The relative occurrence of
post--starbursts suggests a very similar quenching efficiency in clusters at
redshifts in the 0 to ~1 range. Furthermore, more important than the global
environment, the local density seems to be the main driver of galaxy evolution
in local clusters, at least with respect to their stellar populations content.Comment: 22 pages, 12 Figures. Accepted for publication in A&A. Table A.1
  (catalog of equivalent widths measurements) available on-line or upon reques
Investigations of fast neutron production by 190 GeV/c muon interactions on graphite target

The production of fast neutrons (1 MeV - 1 GeV) in high energy muon-nucleus interactions is poorly understood, yet it is fundamental to the understanding of the background in many underground experiments. The aim of the present experiment (CERN NA55) was to measure spallation neutrons produced by 190 GeV/c muons scattering on carbon target. We have investigated the energy spectrum and angular distribution of spallation neutrons, and we report the result of our measurement of the neutron production differential cross section
Measurement of the longitudinal and transverse cross-section in e^+e^- annihilation at $\sqrt{s}$=35-44 GeV

An investigation of the polar angle distribution of charged hadrons is presented using data taken by the JADE experiment at the PETRA e^+e^- collider at centre-of-mass energies of 35 and 44 GeV. From fits to the polar angle distribution the longitudinal, sigma_L, and transverse, sigma_T, cross-section relative to the total hadronic are determined at an average energy scale of 36.6 GeV. The results are sigma_L/sigma_tot = 0.067 +/- 0.013, sigma_T/sigma_tot = 0.933 -/+ 0.013 where total errors are given and the results are exactly anti-correlated. Using the next-to-leading order QCD prediction for the longitudinal cross-section, the value alpha_S(36.6 GeV) = 0.150 +/- 0.025 of the strong coupling constant is obtained in agreement with the world average value of alpha_S evolved to an energy scale of 36.6 GeV
On the possibility of quantum computation based on photon exchange
  interactions

We examine several proposed schemes by Franson et al. for quantum logic gates
based on non-local exchange interactions between two photons in a medium. In
these schemes the presence of a {\em single} photon in a given mode is supposed
to induce a large phase shift on another photon propagating in the same medium.
We conclude that the schemes proposed so far are not able to produce the
required conditional phase shift, even though the proposals contain many
stimulating and intriguing ideas.Comment: 5 pages REVTeX. Published form + 1 new referenc
Making An Empty Promise With A Quantum Computer

Alice has made a decision in her mind. While she does not want to reveal it
to Bob at this moment, she would like to convince Bob that she is committed to
this particular decision and that she cannot change it at a later time. Is
there a way for Alice to get Bob's trust? Until recently, researchers had
believed that the above task can be performed with the help of quantum
mechanics. And the security of the quantum scheme lies on the uncertainty
principle. Nevertheless, such optimism was recently shattered by Mayers and by
us, who found that Alice can always change her mind if she has a quantum
computer. Here, we survey this dramatic development and its implications on the
security of other quantum cryptographic schemes.Comment: We have revised our paper to emphasize that the result applies to all
  bit commitment schemes (including ones with measurements). Besides, some
  minor inaccuracy was correcte
Neuroimaging of structural pathology and connectomics in traumatic brain injury: Toward personalized outcome prediction☆

Recent contributions to the body of knowledge on traumatic brain injury (TBI) favor the view that multimodal neuroimaging using structural and functional magnetic resonance imaging (MRI and fMRI, respectively) as well as diffusion tensor imaging (DTI) has excellent potential to identify novel biomarkers and predictors of TBI outcome. This is particularly the case when such methods are appropriately combined with volumetric/morphometric analysis of brain structures and with the exploration of TBI-related changes in brain network properties at the level of the connectome. In this context, our present review summarizes recent developments on the roles of these two techniques in the search for novel structural neuroimaging biomarkers that have TBI outcome prognostication value. The themes being explored cover notable trends in this area of research, including (1) the role of advanced MRI processing methods in the analysis of structural pathology, (2) the use of brain connectomics and network analysis to identify outcome biomarkers, and (3) the application of multivariate statistics to predict outcome using neuroimaging metrics. The goal of the review is to draw the community's attention to these recent advances on TBI outcome prediction methods and to encourage the development of new methodologies whereby structural neuroimaging can be used to identify biomarkers of TBI outcome
Testing the FPS approach in d=1

We apply the approach of S. Ferrara, M. Porrati and A. Sagnotti \cite{FPS} to
the one dimensional system described by the $N=2, d=1$ supersymmetric action
for two particles in which one of $N=1$ supersymmetries is spontaneously
broken. Using the nonlinear realization approach we reconsider the system in
the basis where only one superfield has the Goldstone nature while the second
superfield can be treated as the matter one, being invariant under
transformations of the spontaneously broken $N=1$ supersymmetry. We establish
the transformations relating the two selected FPS-like cases with our more
general one, and find the field redefinitions which relate these two cases.
Thus we demonstrate, at least in one dimension, that the only difference
between two FPS cases lies in the different choice of the actions, while the
supermultiplets specified by the FPS-like constraints are really the same.
Going further with the nonlinear realization approach, we construct the most
general action for the system of two $N=1$ superfields possessing one
additional hidden spontaneously broken $N=1$ supersymmetry. The constructed
action contains two arbitrary functions and reduces to the FPS actions upon
specification of these functions. Unfortunately, the exact form of these
functions corresponding to FPS actions is not very informative and gives no
explanation on why the FPS cases are selected.Comment: 13 pages, PACS: 11.30.Pb, 12.60.J
Formation of S0 galaxies through mergers: Explaining angular momentum
  and concentration change from spirals to S0s

The CALIFA team has recently found that the stellar angular momentum and
concentration of late-type spiral galaxies are incompatible with those of
lenticular galaxies (S0s), concluding that fading alone cannot satisfactorily
explain the evolution from spirals into S0s. Here we explore whether major
mergers can provide an alternative way to transform spirals into S0s by
analysing the spiral-spiral major mergers from the GalMer database that lead to
realistic, relaxed S0-like galaxies. We find that the change in stellar angular
momentum and concentration can explain the differences in the
$\lambda_\mathrm{Re}$--$R_{90}/R_{50}$ plane found by the CALIFA team. Major
mergers thus offer a feasible explanation for the transformation of spirals
into S0s.Comment: 7 pages, 1 figure, accepted for publication in A&
Staff-student Partnership in Practice in Higher Education :
                    The Impact on Learning and Teaching

?? 2012 The Authors. Published with open access by Elsevier Ltd.This staff-student collaborative project involved six small project teams each composed of staff and undergraduate students studying within the University of Hertfordshire, UK. Each project team engaged in a mini-project designed to research an aspect of learning and teaching to develop learning and teaching and to enhance students??? employability skills. The ???student researchers??? from the small project teams were also members of a larger coaching group that met with the project lead and other experienced colleagues and undertook joint enquiry. Students used reflective logs as one means of recording data on their developing employability skills and their learning from the project. Evaluation activities included documentation of all coaching group workshops and collecting quantitative and qualitative data for each learning and teaching research project. The usefulness of this data was evaluated by staff members in relation to its impact on their module planning. The main implication of this approach is that staff-student partnership in learning and teaching has a significant impact on learning and teaching development and enhancement, learning to learn, raising the profile of research into learning and teaching, and employability skills and attributes. The student researchers came to a much deeper understanding of learning and teaching, and became much more aware of their responsibility for their own learning and committed to enhancing the learning of others. Members of staff noted that working with students had been ???extremely inspirational???- seeing students work with other students and what they could achieve that could not be achieved by members of staff
Dynamics of isolated-photon plus jet production in pp collisions at s=7 TeV with the ATLAS detector

The dynamics of isolated-photon plus jet production in pp collisions at a centre-of-mass energy of 7 TeV has been studied with the ATLAS detector at the LHC using an integrated luminosity of 37 pb-1. Measurements of isolated-photon plus jet bin-averaged cross sections are presented as functions of photon transverse energy, jet transverse momentum and jet rapidity. In addition, the bin-averaged cross sections as functions of the difference between the azimuthal angles of the photon and the jet, the photon-jet invariant mass and the scattering angle in the photon-jet centre-of-mass frame have been measured. Next-to-leading-order QCD calculations are compared to the measurements and provide a good description of the data, except for the case of the azimuthal opening angle. Â© 2013 CERN
Relevance evaluation of engineering masters program in Peru

In a context of mass higher education, it is necessary to ensure not only quality but also the relevance of engineering master's programs, namely the appropriateness of the objectives and outcomes to the needs and interests of the program beneficiaries. After a literature review we analyzed the evaluation models of three organizations in Peru: the Board of Evaluation, Accreditation and Certification of the University Education Quality CONEAU, the Institute of Quality and Accreditation of Computing, Engineering and Technology - ICACIT and the Pontificia Universidad Catolica del Peru. The result of this study is a model for relevance evaluation for an engineering master¿s program in Peru
Subnanometre resolution in three-dimensional magnetic resonance imaging of individual dark spins

Magnetic resonance imaging (MRI) has revolutionized biomedical science by providing non-invasive, three-dimensional biological imaging. However, spatial resolution in conventional MRI systems is limited to tens of micrometres, which is insufficient for imaging on molecular scales. Here, we demonstrate an MRI technique that provides subnanometre spatial resolution in three dimensions, with single electron-spin sensitivity. Our imaging method works under ambient conditions and can measure ubiquitous /`dark/` spins, which constitute nearly all spin targets of interest. In this technique, the magnetic quantum-projection noise of dark spins is measured using a single nitrogen-vacancy (NV) magnetometer located near the surface of a diamond chip. The distribution of spins surrounding the NV magnetometer is imaged with a scanning magnetic-field gradient. To evaluate the performance of the NV-MRI technique, we image the three-dimensional landscape of electronic spins at the diamond surface and achieve an unprecedented combination of resolution (0.8 nm laterally and 1.5 nm vertically) and single-spin sensitivity. Our measurements uncover electronic spins on the diamond surface that can potentially be used as resources for improved magnetic imaging. This NV-MRI technique is immediately applicable to diverse systems including imaging spin chains, readout of spin-based quantum bits, and determining the location of spin labels in biological systems
Analysing powers and spin correlations in deuteron–proton charge exchange at 726 MeV

The charge exchange of vector polarised deuterons on a polarised hydrogen target has been studied in a high statistics experiment at the COSY-ANKE facility at a deuteron beam energy of Td=726 MeVTd=726 MeV. By selecting two fast protons at low relative energy EppEpp, the measured analysing powers and spin correlations are sensitive to interference terms between specific neutron–proton charge-exchange amplitudes at a neutron kinetic energy of View the MathML sourceTn≈12Td=363 MeV. An impulse approximation calculation, which takes into account corrections due to the angular distribution in the diproton, describes reasonably the dependence of the data on both EppEpp and the momentum transfer. This lends broad support to the current neutron–proton partial wave solution that was used in the estimation
Walking in the 3-dimensional large N scalar model

The solvability of the three-dimensional O( N ) scalar field theory in the large N limit makes it an ideal toy model exhibiting “walking” behavior, expected in some SU( N ) gauge theories with a large number of fermion flavors. We study the model using lattice regularization and show that when the ratio of the particle mass to an effective 4-point coupling (with dimension mass) is small, the beta function associated to the running 4-point coupling is “walking”. We also study lattice artifacts and finite size effects, and find that while the former can be sizable at realistic correlation length, the latter are under control already at lattice sizes a few (∼3) correlation lengths. We show the robustness of the walking phenomenon by showing that it can also be observed by studying physical observables such as the scattering phase shifts and the mass gap in finite volume
Classical integrable systems and soliton equations related to eleven-vertex R -matrix

In our recent paper we suggested a natural construction of the classical relativistic integrable tops in terms of the quantum R -matrices. Here we study the simplest case – the 11-vertex R -matrix and related gl 2 rational models. The corresponding top is equivalent to the 2-body Ruijsenaars–Schneider (RS) or the 2-body Calogero–Moser (CM) model depending on its description. We give different descriptions of the integrable tops and use them as building blocks for construction of more complicated integrable systems such as Gaudin models and classical spin chains (periodic and with boundaries). The known relation between the top and CM (or RS) models allows to rewrite the Gaudin models (or the spin chains) in the canonical variables. Then they assume the form of n -particle integrable systems with 2 n constants. We also describe the generalization of the top to 1+1 field theories. It allows us to get the Landau–Lifshitz type equation. The latter can be treated as non-trivial deformation of the classical continuous Heisenberg model. In a similar way the deformation of the principal chiral model is described