3,392 research outputs found
-dimensional charged Anti-de-Sitter black holes in gravity
We present a -dimensional charged Anti-de-Sitter black hole solutions in
gravity, where and . These solutions are
characterized by flat or cylindrical horizons. The interesting feature of these
solutions is the existence of inseparable electric monopole and quadrupole
terms in the potential which share related momenta, in contrast with most of
the known charged black hole solutions in General Relativity and its
extensions. Furthermore, these solutions have curvature singularities which are
milder than those of the known charged black hole solutions in General
Relativity and Teleparallel Gravity. This feature can be shown by calculating
some invariants of curvature and torsion tensors. Furthermore, we calculate the
total energy of these black holes using the energy-momentum tensor. Finally, we
show that these charged black hole solutions violate the first law of
thermodynamics in agreement with previous results.Comment: 11 Pages, will appear in JHE
Rotating charged AdS solutions in quadratic gravity
We present a class of asymptotically anti-de Sitter charged rotating black
hole solutions in gravity in -dimensions, where . These solutions are nontrivial extensions of the solutions presented in
\cite{Lemos:1994xp} and \cite{Awad:2002cz} in the context of general
relativity. They are characterized by cylindrical, toroidal or flat horizons,
depending on global identifications. The static charged black hole
configurations obtained in \cite{Awad:2017tyz} are recovered as special cases
when the rotation parameters vanish. Similar to \cite{Awad:2017tyz} the static
black holes solutions have two different electric multipole terms in the
potential with related moments. Furthermore, these solutions have milder
singularities compared to their general relativity counterparts. Using the
conserved charges expressions obtained in \cite{Ulhoa:2013gca} and
\cite{Maluf:2008ug} we calculate the total mass/energy and the angular momentum
of these solutions.Comment: 11 pages, Version accepted in EPJ
Phase Portraits of general f(T) Cosmology
We use dynamical system methods to explore the general behaviour of
cosmology. In contrast to the standard applications of dynamical analysis, we
present a way to transform the equations into a one-dimensional autonomous
system, taking advantage of the crucial property that the torsion scalar in
flat FRW geometry is just a function of the Hubble function, thus the field
equations include only up to first derivatives of it, and therefore in a
general cosmological scenario every quantity is expressed only in terms
of the Hubble function. The great advantage is that for one-dimensional systems
it is easy to construct the phase space portraits, and thus extract information
and explore in detail the features and possible behaviours of cosmology.
We utilize the phase space portraits and we show that cosmology can
describe the universe evolution in agreement with observations, namely starting
from a Big Bang singularity, evolving into the subsequent thermal history and
the matter domination, entering into a late-time accelerated expansion, and
resulting to the de Sitter phase in the far future. Nevertheless,
cosmology can present a rich class of more exotic behaviours, such as the
cosmological bounce and turnaround, the phantom-divide crossing, the Big Brake
and the Big Crunch, and it may exhibit various singularities, including the
non-harmful ones of type II and type IV. We study the phase space of three
specific viable models offering a complete picture. Moreover, we present
a new model of gravity that can lead to a universe in agreement with
observations, free of perturbative instabilities, and applying the Om(z)
diagnostic test we confirm that it is in agreement with the combination of
SNIa, BAO and CMB data at 1 confidence level.Comment: 39 pages, 12 figures, version published in JCA
Broadband probing magnetization dynamics of the coupled vortex state permalloy layers in nanopillars
Broadband magnetization response of coupled vortex state magnetic dots in
layered nanopillars was explored as a function of in-plane magnetic field and
interlayer separation. For dipolarly coupled circular Py(25 nm)/Cu(20 nm)/Py(25
nm) nanopillars of 600 nm diameter, a small in-plane field splits the
eigenfrequencies of azimuthal spin wave modes inducing an abrupt transition
between in-phase and out-of-phase kinds of the low-lying coupled spin wave
modes. The critical field for this splitting is determined by antiparallel
chiralities of the vortices in the layers. Qualitatively similar (although more
gradual) changes occur also in the exchange coupled Py(25 nm)/Cu(1 nm)/Py(25
nm) tri-layer nanopillars. These findings are in qualitative agreement with
micromagnetic dynamic simulations
Precise probing spin wave mode frequencies in the vortex state of circular magnetic dots
We report on detailed broadband ferromagnetic resonance measurements of
azimuthal and radial spin wave excitations in circular Permalloy dots in the
vortex ground state. Dots with aspect ratio (Beta =height over radius) varied
from 0.03 to 0.1 were explored. We found that for Beta exceeding approximately
0.05, variation of the spin wave eigenfrequencies with Beta deviates from the
predicted dependence. The frequency splitting of two lowest azimuthal modes was
observed. The experimentally observed dependence of the frequency splitting on
beta was reasonably well described by dynamic splitting model accounting the
spin-waves and, vortex gyrotropic mode interaction
Preventing type 2 diabetes mellitus in Qatar by reducing obesity, smoking, and physical inactivity: mathematical modeling analyses.
BACKGROUND: The aim of this study was to estimate the impact of reducing the prevalence of obesity, smoking, and physical inactivity, and introducing physical activity as an explicit intervention, on the burden of type 2 diabetes mellitus (T2DM), using Qatar as an example. METHODS: A population-level mathematical model was adapted and expanded. The model was stratified by sex, age group, risk factor status, T2DM status, and intervention status, and parameterized by nationally representative data. Modeled interventions were introduced in 2016, reached targeted level by 2031, and then maintained up to 2050. Diverse intervention scenarios were assessed and compared with a counter-factual no intervention baseline scenario. RESULTS: T2DM prevalence increased from 16.7% in 2016 to 24.0% in 2050 in the baseline scenario. By 2050, through halting the rise or reducing obesity prevalence by 10-50%, T2DM prevalence was reduced by 7.8-33.7%, incidence by 8.4-38.9%, and related deaths by 2.1-13.2%. For smoking, through halting the rise or reducing smoking prevalence by 10-50%, T2DM prevalence was reduced by 0.5-2.8%, incidence by 0.5-3.2%, and related deaths by 0.1-0.7%. For physical inactivity, through halting the rise or reducing physical inactivity prevalence by 10-50%, T2DM prevalence was reduced by 0.5-6.9%, incidence by 0.5-7.9%, and related deaths by 0.2-2.8%. Introduction of physical activity with varying intensity at 25% coverage reduced T2DM prevalence by 3.3-9.2%, incidence by 4.2-11.5%, and related deaths by 1.9-5.2%. CONCLUSIONS: Major reductions in T2DM incidence could be accomplished by reducing obesity, while modest reductions could be accomplished by reducing smoking and physical inactivity, or by introducing physical activity as an intervention
Higher Dimensional Kerr-AdS Black Holes and the AdS/CFT Correspondence
Using the counterterm subtraction technique we calculatehe stress-energy
tensor, action, and other physical quantities for Kerr-AdS black holes in
various dimensions. For Kerr-AdS_5 with both rotation parameters non-zero, we
demonstrate that stress-energy tensor, in the zero mass parameter limit, is
equal to the stress tensor of the weakly coupled four dimensional dual field
theory. As a result, the total energy of the generalKerr-AdS_5 black hole at
zero mass parameter, exactly matches the Casimir energy of the dual field
theory. We show that at high temperature, the general Kerr-AdS_5 and
perturbative field theory stress-energy tensors are equal, up to the usual
factor of 3/4. We also use the counterterm technique to calculate the stress
tensors and actions for Kerr-AdS_6, and Kerr-AdS_7 black holes, with one
rotation parameter, and we display the results. We discuss the conformal
anomalies of the field theories dual to the Kerr-AdS_5 and Kerr-AdS_7
spacetimes. In these two field theories, we show that the rotation parameters
break conformal invariance but not scale invariance, a novel result for a
non-trivial field theory. For Kerr-AdS_7 the conformal anomalies calculated on
the gravity side and the dual (0,2) tensor multiplet theory are equal up to 4/7
factor. We expect that the Casimir energy of the free field theory is the same
as the energy of the Kerr-AdS_7 black hole (with zero mass parameter), up to
that factor.Comment: 18 pages, LaTex (v3: references added. footnote added
The non-Abelian gauge theory of matrix big bangs
We study at the classical and quantum mechanical level the time-dependent
Yang-Mills theory that one obtains via the generalisation of discrete
light-cone quantisation to singular homogeneous plane waves. The non-Abelian
nature of this theory is known to be important for physics near the
singularity, at least as far as the number of degrees of freedom is concerned.
We will show that the quartic interaction is always subleading as one
approaches the singularity and that close enough to t=0 the evolution is driven
by the diverging tachyonic mass term. The evolution towards asymptotically flat
space-time also reveals some surprising features.Comment: 29 pages, 8 eps figures, v2: minor changes, references added: v3
small typographical changes
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