pinecone/core-2020-05-10-deduplication huggingface dataset:
Gravity on a parallelizable manifold. Exact solutions

The wave type field equation $\square \vt^a=\la \vt^a$, where $\vt^a$ is a
coframe field on a space-time, was recently proposed to describe the gravity
field. This equation has a unique static, spherical-symmetric,
asymptotically-flat solution, which leads to the viable Yilmaz-Rosen metric. We
show that the wave type field equation is satisfied by the pseudo-conformal
frame if the conformal factor is determined by a scalar 3D-harmonic function.
This function can be related to the Newtonian potential of classical gravity.
So we obtain a direct relation between the non-relativistic gravity and the
relativistic model: every classical exact solution leads to a solution of the
field equation. With this result we obtain a wide class of exact, static
metrics. We show that the theory of Yilmaz relates to the pseudo-conformal
sector of our construction. We derive also a unique cosmological (time
dependent) solution of the described type.Comment: Latex, 17 page
Spin Light of Neutrino in Dense Matter

We develop the quantum theory of the spin light of neutrino ($SL\nu$) exactly
accounting for the effect of background matter. Contrary to the already
performed studies of the $SL\nu$, in this paper we derive explicit and closed
expressions for the $SL\nu$ rate and power and for the emitted photon energy,
which are valid for an arbitrary matter density (including very high values).
The spatial distribution of the radiation power and the dependence of the
emitted photon energy on the direction of radiation are also studied in detail
for the first time. We analyze the $SL\nu$ polarization properties and show
that within a wide range of neutrino momenta and matter densities the $SL\nu$
radiation is circularly polarized. Conditions for effective $SL\nu$ photon
propagation in the electron plasma are discussed. It is also shown that in
dense matter the average energy of the emitted photon can reach values in the
range from one third of the neutrino momentum up to one half of the neutrino
energy in matter. The main features of the studied radiation are summarized,
and possibilities for the $SL\nu$ production during different astrophysical and
cosmology processes are discussed.Comment: 15 pages, 7 figures, in: Proceedings of Les Recontres de Physique de
  la Vallee d'Aoste ("Results and Perspectives in Particle Physics", March
  2005, La Thuile, Italy), ed. by Mario Greco, Frascati Physics Series, Italy,
  2005; modified version is accepted for publication in Phys.Lett.
Magnetic field amplification and evolution in turbulent collisionless
  MHD: an application to the ICM

The amplification and maintenance of the observed magnetic fields in the ICM
are usually attributed to the turbulent dynamo action. This is generally
derived employing a collisional MHD model. However, in the ICM the ion mean
free path between collisions is of the order of the dynamical scales, thus
requiring a collisionless MHD description. Unlike collisional MHD simulations,
our study uses an anisotropic plasma pressure with respect to the direction of
the local magnetic field, which brings the plasma within a parameter space
where collisionless instabilities should take place. Within the adopted model
these instabilities are contained at bay through the relaxation term of the
pressure anisotropy which simulates the feedback of the mirror and firehose
instabilities. This relaxation acts to get the plasma distribution function
consistent with the empirical studies of collisionless plasmas. Our 3D
numerical simulations of forced transonic turbulence motivated by modeling of
the turbulent ICM are performed for different initial values of the magnetic
field intensity, and different relaxation rates of the pressure anisotropy. We
found that in the high beta plasma regime corresponding to the ICM conditions,
a fast anisotropy relaxation rate gives results which are similar to the
collisional-MHD model as far as the statistical properties of the turbulence
are concerned. Also, the amplification of seed magnetic fields due to the
turbulent dynamo action is similar to the collisional-MHD model. Our
simulations that do not employ the anisotropy relaxation deviate significantly
from the collisional-MHD results, and show more power at the small-scale
fluctuations of both density and velocity representing the results of the
instabilities. For these simulations the large scale fluctuations in the
magnetic field are mostly suppressed and the turbulent dynamo fails in
amplifying seed magnetic fields.Comment: 24 pages, 12 figures, submitted to Ap
New compact forms of the trigonometric Ruijsenaars-Schneider system

The reduction of the quasi-Hamiltonian double of ${\mathrm{SU}}(n)$ that has
been shown to underlie Ruijsenaars' compactified trigonometric $n$-body system
is studied in its natural generality. The constraints contain a parameter $y$,
restricted in previous works to $0<y < \pi/n$ because Ruijsenaars' original
compactification relies on an equivalent condition. It is found that allowing
generic $0<y<\pi/2$ results in the appearance of new self-dual compact forms,
of two qualitatively different types depending on the value of $y$. The type
(i) cases are similar to the standard case in that the reduced phase space
comes equipped with globally smooth action and position variables, and turns
out to be symplectomorphic to ${\mathbb{C}P^{n-1}}$ as a Hamiltonian toric
manifold. In the type (ii) cases both the position variables and the action
variables develop singularities on a nowhere dense subset. A full
classification is derived for the parameter $y$ according to the type (i)
versus type (ii) dichotomy. The simplest new type (i) systems, for which $\pi/n
< y < \pi/(n-1)$, are described in some detail as an illustration.Comment: 31 page
Dynamical signatures of a LCDM-halo and the distribution of the baryons
  in M33

We map the neutral atomic gas content of M33 using high resolution VLA and
GBT observations and fit a tilted ring model to determine the orientation of
the extended gaseous disk and its rotation curve. The disk of M33 warps from 8
kpc outwards without substantial change of its inclination with respect to the
line of sight. Rotational velocities rise steeply with radius in the inner
disk, reaching 100 km/s in 4 kpc, then the rotation curve becomes more
perturbed and flatter with velocities as high as 120-130 km/s out to 23 kpc. We
derive the stellar mass surface density map of M33's optical disk, via pixel
-SED fitting methods based on population synthesis models, which highlights
variations in the mass-to-light ratio. The stellar mass surface further out is
estimated from deep images of outer disk fields. Stellar and gas maps are then
used in the dynamical analysis of the rotation curve to constrain the dark
matter distribution which is relevant at all radii. A dark matter halo with a
Navarro-Frenk-White density profile in a LCDM cosmology, provides the best fit
to the rotation curve for a dark halo concentration C=10 and a total halo mass
of 4.3 10^{11}Msun. This imples a baryonic fraction of order 0.02 and the
evolutionary history of this galaxy should account for loss of a large fraction
of its original baryonic content.Comment: 19 pages, 18 figures, Accepted for publication in A&A (replacement
  for corrected references to two papers
The impact of energy conservation in transport models on the
  $\pi^-/\pi^+$ multiplicity ratio in heavy-ion collisions and the symmetry
  energy

The charged pion multiplicity ratio in intermediate energy central heavy-ion
collisions has been proposed as a suitable observable to constrain the high
density dependence of the isovector part of the equation of state, with
contradicting results. Using an upgraded version of the T\"ubingen QMD
transport model, which allows the conservation of energy at a local or global
level by accounting for the potential energy of hadrons in two-body collisions
and leading thus to particle production threshold shifts, we demonstrate that
compatible constraints for the symmetry energy stiffness can be extracted from
pion multiplicity and elliptic flow observables. Nevertheless, pion
multiplicities are proven to be highly sensitive to the yet unknown isovector
part of the in-medium $\Delta$(1232) potential which hinders presently the
extraction of meaningful information on the high density dependence of the
symmetry energy. A solution to this problem together with the inclusion of
contributions presently neglected, such as in-medium pion potentials and
retardation effects, are needed for a final verdict on this topic.Comment: 12 pages, 7 figure
Integration in the GHP formalism; 3, Finding all conformally flat radiation metrics as an example of an "optimal situation"

Held has proposed an integration procedure within the GHP formalism bui= lt around four real, functionally independent, zero-weighted scalars. He sug= gests that such a procedure would be particularly simple for the `optimal situa= tion', when the formalism directly supplies the full quota of four scalars of th= is type; a spacetime without any Killing vectors would be such a situation. = Wils has recently obtained a metric which he claims is the only conformally fl= at, pure radiation metric which is not a plane wave; this metric has been sho= wn by Koutras to admit no Killing vectors, in general. Therefore, as a simple illustration of the GHP integration procedure, we obtain systematically t= he complete class of conformally flat, pure radiation metrics. Our result sh= ows that the conformally flat, pure radiation metrics, which are not plane wa= ves, are a larger class than Wils has obtained
Superstring Theory on $AdS_{2} x S^{2}$ as a Coset Supermanifold

We quantize the superstring on the AdS_2 x S^2 background with Ramond-Ramond flux using a PSU(1,1|2)/U(1) x U(1) sigma model with a WZ term. One-loop conformal invariance of the model is guaranteed by a general mechanism which holds for coset spaces G/H where G is Ricci-flat and H is the invariant locus of a Z_4 automorphism of G. This mechanism gives conformal theories for the PSU(1,1|2) x PSU(2|2)/SU(2) x SU(2) and PSU(2,2|4)/SO(4,1) x SO(5) coset spaces, suggesting our results might be useful for quantizing the superstring on AdS_3 x S^3 and AdS_5 x S^5 backgrounds
Microscopics of Rotating Black Holes: Entropy and Greybody Factors

We review the status of microscopic counting of rotating black hole degrees
of freedom. We present two complementary approaches which both utilize the
near-horizon geometry and precisely reproduce the Bekenstein Hawking entropy
for near-extreme rotating black holes in D=4 and D=5. The first one, proposed
by Strominger, is applicable for the Ramond-Ramond sector and relies on the
correspondence between the near-horizon geometry and the conformal field theory
on its boundary. The second one (somewhat more heuristic), employs the
conformal sigma-model in the Neveu-Schwarz-Neveu-Schwarz sector and accounts
for the black hole microstates by counting the small scale oscillations of the
dyonic string there. We also present the wave equation for the minimally
coupled scalars for such rotating black hole background, and discuss its
implication for the greybody factors. The results are illustrated for the
prototype D=5 rotating black hole.Comment: 20 pages, RevTeX, Based on talks given at PASCOS '98, Strings '98,
  and Buckow '9
Nonlinear disturbance evolution in a two-dimensional boundary layer along an elastic plate and induced radiated sound

The interaction between a boundary-layer flow and an elastic plate is addressed by direct numerical simulation, taking into account the full coupling between the fluid flow and the flexible wall. The convectively unstable flow state is harmonically forced and two-dimensional nonlinearly saturated wavelike disturbances are computed along archetype-plates with respect to stiffness and natural frequencies. In the aim of determining the low-Mach-number radiated sound for the system, the simulation data are used to solve the Lighthill’s equation in terms of a Green’s function in the wavenumber-frequency space.
Different degrees of fluid-structure coupling are implemented in the radiated sound model and the resulting acoustic pressure levels are compared. The sound radiation levels are shown to be increased in the presence of flexible walls with however significant differences in the radiated pressure levels for different coupling assumptionsThe authors gratefully acknowledge Thales Underwater Systems and DCNS for their financial support to this work
Looking below the surface : The cultural ecosystem service values of UK marine protected areas (MPAs)

Acknowledgements This research was funded by the UK Natural Environment, Economic and Social, and Arts and Humanities Research Councils, the Department for the Environment, Food and Rural Affairs, and the Welsh Government as part of the Shared, Plural and Cultural Values work package of the UK National Ecosystem Assessment follow-on-phase (www.lwec.org.uk/sharedvalues). Additional funding was provided by the Calouste Gulbenkian Foundation through the Marine Conservation Society. Many thanks to Althea Davies (University of Aberdeen, currently University of St. Andrews), Ros Bryce (University of Aberdeen, currently University of the Highlands and Islands), Mike Christie (Aberystwyth University), Mandy Ryan (University of Aberdeen), Susan Ranger, Jean-Luc Solandt and Calum Duncan (Marine Conservation Society), Sophie Rolls and Rebecca Clark (Natural England), Mansi Konar (Defra) and Kerry Turner (University of East Anglia) for advising on the research design, and Alison Dando (British Sub-Aqua Club) and David Mitchell (Angling Trust) for their indispensable help with mobilising respondents. We are also grateful to the participants of our online survey and focus groups for their time and effort.Peer reviewedPublisher PD
The impact of a large-scale quality improvement programme on work engagement: preliminary results from a national cross-sectional-survey of the 'Productive Ward'

Background: Quality improvement (QI) Programmes, like the Productive Ward: Releasing-time-to-care initiative, aim to 'engage' and 'empower' ward teams to actively participate, innovate and lead quality improvement at the front line. However, little is known about the relationship and impact that QI work has on the 'engagement' of the clinical teams who participate and vice-versa. Objective: This paper explores and examines the impact of a large-scale QI programme, the Productive Ward, on the 'work engagement' of the nurses and ward teams involved. Design/methods: Using the Utrecht Work Engagement Scale (UWES), we surveyed, measured and analysed work engagement in a representative test group of hospital-based ward teams who had recently commenced the latest phase of the national 'Productive Ward' initiative in Ireland and compared them to a control group of similar size and matched (as far as is possible) on variables such as ward size, employment grade and clinical specialty area. Results: 338 individual datasets were recorded, n=. 180 (53.6) from the Productive Ward group, and n=. 158 (46.4) from the control group; the overall response rate was 67, and did not differ significantly between the Productive Ward and control groups. The work engagement mean score (Â±standard deviation) in the Productive group was 4.33(Â±0.88), and 4.07(Â±1.06) in the control group, representing a modest but statistically significant between-group difference (. p=. 0.013, independent samples t-test). Similarly modest differences were observed in all three dimensions of the work engagement construct. Employment grade and the clinical specialty area were also significantly related to the work engagement score (. p<. 0.001, general linear model) and (for the most part), to its components, with both clerical and nurse manager grades, and the elderly specialist areas, exhibiting substantially higher scores. Conclusions: The findings demonstrate how QI activities, like those integral to the Productive Ward programme, appear to positively impact on the work engagement (the vigour, absorption and dedication) of ward-based teams. The use and suitability of the UWES as an appropriate measure of 'engagement' in QI interventions was confirmed. The engagement of nurses and front-line clinical teams is a major component of creating, developing and sustaining a culture of improvement. Â© 2014 The Authors
Nonthermal Two Component Dark Matter Model for Fermi-LAT $\gamma$-ray
  excess and 3.55 keV X-ray Line

A two component model of nonthermal dark matter is formulated to
simultaneously explain the Fermi-LAT results indicating a $\gamma$-ray excess
observed from our Galactic Centre in the 1-3 GeV energy range and the detection
of an X-ray line at 3.55 keV from extragalactic sources. Two additional
Standard Model singlet scalar fields $S_2$ and $S_3$ are introduced. These
fields couple among themselves and with the Standard Model Higgs doublet $H$.
The interaction terms among the scalar fields, namely $H$, $S_2$ and $S_3$, are
constrained by the application of a discrete $\mathbb{Z}_2\times
\mathbb{Z}^\prime_2$ symmetry which breaks softly to a remnant
$\mathbb{Z}^{\prime \prime}_2$ symmetry. This residual discrete symmetry is
then spontaneously broken through an MeV order vacuum expectation value $u$ of
the singlet scalar field $S_3$. The resultant physical scalar spectrum has the
Standard Model like Higgs as $\chi_{{}_{{}_1}}$ with $M_{\chi_{{}_{{}_1}}}\sim
125$ GeV, a moderately heavy scalar $\chi_{{}_{{}_2}}$ with $50 \,\,{\rm GeV}
\leq M_{\chi_{{}_{{}_2}}}\leq 80\,\,{\rm GeV}$ and a light $\chi_{{}_{{}_3}}$
with $M_{\chi_{{}_{{}_3}}} \sim 7$ keV. There is only tiny mixing between
$\chi_{{}_{{}_1}}$ and $\chi_{{}_{{}_2}}$ as well as between $\chi_{{}_{{}_1}}$
and $\chi_{{}_{{}_3}}$. The lack of importance of domain wall formation in the
present scenario from the spontaneous breaking of the discrete symmetry
${\mathbb{Z}_2^{\prime\prime}}$, provided $u\leq 10$ MeV, is pointed out. We
find that our proposed two component dark matter model is able to explain
successfully both the above mentioned phenomena $-$ the Fermi-LAT observed
$\gamma$-ray excess (from the $\chi_{{}_{{}_2}} \rightarrow {\rm b} \bar{\rm
b}$ decay mode) and the observation of the X-ray line (from the decay channel
$\chi_{{}_{{}_3}}\rightarrow\gamma \gamma$) by the XMM-Newton observatory.Comment: 11 eps Figures, 2 Tables, 32 Pages. Minor addition in Abstract.
  Inclusion in Section 1 of discussion of earlier attempts to explain the
  concerned phenomena by astrophysical processes. Extension of discussion in
  Section 6 to the case of a steeper dark matter density profile. Results
  unchanged. Version accepted for publication in JHE
Stiffening of Red Blood Cells Induced by Disordered Cytoskeleton
  Structures: A Joint Theory-experiment Study

The functions and elasticities of the cell are largely related to the
structures of the cytoskeletons underlying the lipid bi-layer. Among various
cell types, the Red Blood Cell (RBC) possesses a relatively simple cytoskeletal
structure. Underneath the membrane, the RBC cytoskeleton takes the form of a
two dimensional triangular network, consisting of nodes of actins (and other
proteins) and edges of spectrins. Recent experiments focusing on the malaria
infected RBCs (iRBCs) showed that there is a correlation between the elongation
of spectrins in the cytoskeletal network and the stiffening of the iRBCs. Here
we rationalize the correlation between these two observations by combining the
worm-like chain (WLC) model for single spectrins and the Effective Medium
Theory (EMT) for the network elasticity. We specifically focus on how the
disorders in the cytoskeletal network affect its macroscopic elasticity.
Analytical and numerical solutions from our model reveal that the stiffness of
the membrane increases with increasing end-to-end distances of spectrins, but
has a non-monotonic dependence on the variance of the end-to-end distance
distributions. These predictions are verified quantitively by our AFM and
micropipette aspiration measurements of iRBCs. The model may, from a molecular
level, provide guidelines for future identification of new treatment methods
for RBC related diseases, such as malaria infection.Comment: 8 pages, 4 figures; 3 supporting figure
Measuring theta12 Despite an Uncertain Reactor Neutrino Spectrum

The recently discovered 5 MeV bump highlights that the uncertainty in the
reactor neutrino spectrum is far greater than some theoretical estimates.
Medium baseline reactor neutrino experiments will deliver by far the most
precise ever measurements of theta12. However, as a result of the bump, such a
determination of theta12 using the theoretical spectrum would yield a value of
sin^2(2theta12) which is more than 1% higher than the true value. We show that
by using recent measurements of the reactor neutrino spectrum the precision of
a measurement of theta12 at a medium baseline reactor neutrino experiment can
be improved appreciably. We estimate this precision as a function of the 9Li
spallation background veto efficiency and dead time.Comment: 8 pages, 2 eps figures, v3: Refs adde
GUT-inspired SUSY and the muon g-2 anomaly: prospects for LHC 14 TeV

We consider the possibility that the muon g-2 anomaly, $\delta(g-2)$, finds
its origins in low energy supersymmetry (SUSY). In the general MSSM the
parameter space consistent with $\delta(g-2)$ and correct dark matter relic
density of the lightest neutralino easily evades the present direct LHC limits
on sparticle masses and also lies to a large extent beyond future LHC
sensitivity. The situation is quite different in GUT-defined scenarios where
input SUSY parameters are no longer independent. We analyze to what extent the
LHC can probe a broad class of GUT-inspired SUSY models with gaugino
non-universality that are currently in agreement with the bounds from
$\delta(g-2)$, as well as with the relic density and the Higgs mass
measurement. To this end we perform a detailed numerical simulation of several
searches for electroweakino and slepton production at the LHC and derive
projections for the LHC 14 TeV run. We show that, within GUT-scale SUSY there
is still plenty of room for the explanation of the muon anomaly, although the
current LHC data already imply strong limits on the parameter space consistent
with $\delta(g-2)$. On the other hand, we demonstrate that the parameter space
will be basically fully explored within the sensitivity of the 14 TeV run with
300 fb$^{-1}$. This opens up the interesting possibility that, if the g-2
anomaly is real then some positive signals must be detected at the LHC, or else
these models will be essentially ruled out. Finally, we identify the few
surviving spectra that will provide a challenge for detection at the LHC 14 TeV
run and we characterize their properties.Comment: 38 pages, 10 figures. Citations added, typos corrected. Version
  published in JHE
The star-triangle relation and 3d superconformal indices

Superconformal indices of 3d N=2 supersymmetric field theories are
investigated from the Yang-Baxter equation point of view. Solutions of the
star-triangle relation, vertex and IRF Yang-Baxter equations are expressed in
terms of the q-special functions associated with these 3d indices. For a
two-dimensional monopole-spin system on the square lattice a free energy per
spin is explicitly determined. Similar to the partition functions,
superconformal indices of 3d theories with the chiral symmetry breaking reduce
to Dirac delta functions with the support on chemical potentials of the
preserved flavor groups.Comment: 20 pages, v2: minor corrections, comments and refs. adde