4,221 research outputs found
Complexity growth rates for AdS black holes in massive gravity and gravity
The "complexity = action" duality states that the quantum complexity is equal
to the action of the stationary AdS black holes within the Wheeler-DeWitt patch
at late time approximation. We compute the action growth rates of the neutral
and charged black holes in massive gravity and the neutral, charged and
Kerr-Newman black holes in gravity to test this conjecture. Besides, we
investigate the effects of the massive graviton terms, higher derivative terms
and the topology of the black hole horizon on the complexity growth rate.Comment: 11 pages, no figur
Asymmetries and Violation in Charmed Baryon Decays into Neutral Kaons
We study the asymmetries and violations in charm-baryon
decays with neutral kaons in the final state. The asymmetry can
be used to search for two-body doubly Cabibbo-suppressed amplitudes of
charm-baryon decays, with the one in as a promising
observable. Besides, it is studied for a new -violation effect in these
processes, induced by the interference between the Cabibbo-favored and doubly
Cabibbo-suppressed amplitudes with the neutral kaon mixing. Once the new
CP-violation effect is determined by experiments, the direct asymmetry in
neutral kaon modes can then be extracted and used to search for new physics.
The numerical results based on symmetry will be tested by the
experiments in the future.Comment: 15 pages, 3 tables. Version published in JHE
Domain wall brane in a reduced Born-Infeld- theory
The Born-Infeld theory is reduced from the Born-Infeld determinantal
gravity in Weitzenb\"ock spacetime. We investigate a braneworld scenario in
this theory and obtain an analytic domain wall solution by utilizing the
first-order formalism. The model is stable against the linear tensor
perturbation. It is shown that the massless graviton is localized on the brane,
but the continuous massive gravitons are non-localized and will generate a tiny
correction with the behavior of to the Newtonian potential.
The four-dimensional teleparallel gravity is recovered as an effective infrared
theory on the brane. As a physical application, we consider the
(quasi-)localization property of spin-1/2 Dirac fermion in this model.Comment: 9 pages, 2 figures, published versio
Gravito-Electromagnetic coupled perturbations and quasinormal modes of a charged black hole with scalar hair
From the quantum point of view, singularity should not exist. Recently, Bah
and Heidmann constructed a five-dimensional singularity free topology
star/black hole [Phys. Rev. Lett. 126, 151101 (2021)]. By integrating the extra
dimension, a four-dimensional static spherical black hole with a magnetic
charge and scalar hair can be obtained. In this paper, we study the quasinormal
modes (QNMs) of the magnetic field and gravitational field on the background of
this four-dimensional charged black hole with scalar hair. The odd parity of
the gravitational perturbations couples with the even parity of the magnetic
field perturbations. Two coupled second-order derivative equations are
obtained. Using the matrix-valued direct integration method, we obtain the
fundamental QNM frequencies numerically. The effect of the magnetic charge on
the QNMs is studied. The differences of the frequencies of the fundamental QNMs
between the charged black hole with scalar hair and the Reissner-Norstr\"{o}m
black hole are very small for the angular number . However, some new
interesting results are found for higher angular number.Comment: 10 pages, 3 figures, 2 tables, some mistakes have been correcte
Thick branes with inner structure in mimetic gravity
In this paper, we study the structure and gravitational resonances of thick
branes generated by a mimetic scalar field in gravity. We obtain several
typical thick brane solutions for . To study their
stability, we analyze the tensor perturbation of the metric. It is shown that
any thick brane model with is stable and the graviton zero mode can
be localized on the brane for each solution, which indicates that the
four-dimensional Newtonian gravity can be restored. The effect of the parameter
on the gravitational resonances is studied. As a brane splits into
multi sub-branes, the effective potential of the tensor perturbation will have
an abundant inner structure with multi-wells, and this will lead to new
phenomena of the gravitational resonances.Comment: 14 pages, 26 figures, improved version, references adde
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