6,408 research outputs found
Supersymmetric black holes and strings from 5D gauged supergravity
We study supersymmetric and
solutions, with and , in five-dimensional
gauged supergravity coupled to five vector multiplets. The gauge groups
considered here are , and
. For gauge group
admiting two supersymmetric vacua, we identify a new class of
and solutions preserving four
supercharges. Holographic RG flows describing twisted compactifications of
four-dimensional SCFTs dual to the vacua to the SCFTs in two and
one dimensions dual to these geometries are numerically given. The solutions
can also be interpreted as supersymmetric black strings and black holes in
asymptotically spaces with near horizon geometries given by
and , respectively. These solutions
broaden previously known black brane solutions including half-supersymmetric
black strings recently found in gauged supergravity. Similar
solutions are also studied in non-compact gauge groups and
.Comment: 35 pages, 12 figures, substantial extension of the results in
arXiv:1811.01608, typos corrected, references adde
Effect of Cross-Linking on the Electrical Properties of LDPE and its Lightning Impulse Ageing Characteristics
Cross-linked polyethylene (XLPE) is commonly used within high voltage cable insulation. It has improved thermal and mechanical resistance compared to normal low density polyethylene (LDPE). However, the cross-linking process may also vary the electrical characteristics of the material. This paper investigates changes in electrical properties of one type of LDPE before and after cross-linking. The effective lightning resistance is also considered, as the application of repetitive lightning impulse overvoltages can be a factor in insulation material ageing of high voltage cables. The material was cross-linked using trigonox-145 peroxide with controlled concentration. Samples were moulded to have a Rogowski profile and gold coated to make sure that they are evenly electrically stressed. Obtained results show that there are reductions in both space charge injection and the permittivity of the material after it is cross-linked. The breakdown strength of the material was also improved. However, the samples studied are more susceptible to ageing due to lightning impulses
Statistical Inference for Partially Observed Markov Processes via the R Package pomp
Partially observed Markov process (POMP) models, also known as hidden Markov
models or state space models, are ubiquitous tools for time series analysis.
The R package pomp provides a very flexible framework for Monte Carlo
statistical investigations using nonlinear, non-Gaussian POMP models. A range
of modern statistical methods for POMP models have been implemented in this
framework including sequential Monte Carlo, iterated filtering, particle Markov
chain Monte Carlo, approximate Bayesian computation, maximum synthetic
likelihood estimation, nonlinear forecasting, and trajectory matching. In this
paper, we demonstrate the application of these methodologies using some simple
toy problems. We also illustrate the specification of more complex POMP models,
using a nonlinear epidemiological model with a discrete population,
seasonality, and extra-demographic stochasticity. We discuss the specification
of user-defined models and the development of additional methods within the
programming environment provided by pomp.Comment: In press at the Journal of Statistical Software. A version of this
paper is provided at the pomp package website: http://kingaa.github.io/pom
Micromagnetic Simulation of Non Uniform Nanodots with Perpendicular Anisotropy
Multilayered Pt/[Co/Pt]/sub 5/ films were fabricated into patterned dots with diameters of 120 and 200 nm by laser interference lithography. Anomalous Hall effect (AHE) measurements were used on an array of dots to measure the switching field and the effects of reversal of an area with reduced anisotropy in the dot were also investigated by micromagnetic simulation. It was shown that a reduction in switching field is caused by an area of reduced anisotropy. The effect of various combinations of a reduction in anisotropy and/or exchange constant, and the size and shape of the area were also discussed in this paper
New cosmological solutions from type II de-Sitter gaugings in 4D gauged supergravity
In this work, which is a follow-up of arXiv:2102.06512, we document new
cosmological solutions from four-dimensional matter-coupled supergravity.
The solutions smoothly interpolate between a spacetime at
and a spacetime at and
arise from the second-order equations of motion. Unlike the previously reported
solutions in arXiv:2102.06512 that involve the diagonal subgroup of both
the electric and magnetic factors in the gauging, these solutions only require
a single factor from either the electric or magnetic part. Two
additional features of these solutions that distinguish them from the
previously presented solutions are the nonvanishing value of the dilaton
and the fact that they are only admitted by the type II de-Sitter gauged
theories.Comment: This is a follow-up work of arXiv:2102.0651
Cosmological solutions from 4D matter-coupled supergravity
From four-dimensional matter-coupled gauged supergravity, we study
smooth time-dependent cosmological solutions interpolating between a
spacetime, with and , in the
infinite past and a spacetime in the infinite future. The solutions were
obtained by solving the second-order equations of motion from all the ten
gauged theories known to admit solutions, of which there are two types.
Type I gauged theories can admit both solutions as well as
supersymmetric solutions while type II gauged theories only admit
solutions. We also study the extent to which the first-order equations
that solve the aforementioned second-order field equations fail to admit the
vacua and their associated cosmological solutions.Comment: v1: 38 pages, 7 figures. v2: slight modification of section 7, plus
more details and references adde
A new proton fluence model for E greater than 10 MeV
Researchers describe a new engineering model for the fluence of protons with energies greater than 10 MeV. The data set used is a combination of observations made primarily from the Earth's surface between 1956 and 1963 and observations made from spacecraft in the vicinity of Earth between 1963 and 1985. With this data set we find that the distinction between ordinary proton events and anomalously large proton events made in earlier work disappears. The greater than 10 MeV fluences at 1 AU calculated with the new model are about twice those expected on the basis of models now in use. In contrast to earlier models, results do not depend critically on the fluence from any one event
Optoelectronics of Inverted Type-I CdS/CdSe Core/Crown Quantum Ring
Inverted type-I heterostructure core/crown quantum rings (QRs) are
quantum-efficient luminophores, whose spectral characteristics are highly
tunable. Here, we study the optoelectronic properties of type-I core/crown
CdS/CdSe QRs in the zincblende phase - over contrasting lateral size and crown
width. For this we inspect their strain profiles, transition energies,
transition matrix elements, spatial charge densities, electronic bandstructure,
band-mixing probabilities, optical gain spectra, maximum optical gains and
differential optical gains. Our framework uses an effective-mass envelope
function theory based on the 8-band kp method employing the valence
force field model for calculating the atomic strain distributions. The gain
calculations are based on the density-matrix equation and take into
consideration the excitonic effects with intraband scattering. Variations in
the QR lateral size and relative widths of core and crown (ergo the
composition) affect their energy levels, band-mixing probabilities, optical
transition matrix elements, emission wavelengths/intensity, etc. The optical
gain of QRs is also strongly dimension and composition dependent with further
dependency on the injection carrier density causing band-filling effect. They
also affect the maximum and differential gain at varying dimensions and
compositions.Comment: Published in AIP Journal of Applied Physics (11 pages, 7 figures
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