Dirac quasinormal modes of two-dimensional charged dilatonic black holes

Bécar, Ramón; González, P. A.; Vásquez, Yerko

doi:10.1140/epjc/s10052-014-2940-1

Cited by 8 publications

(2 citation statements)

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“…They also have BH solutions which play important roles in revealing various aspects of spacetime geometry and quantization of gravity, and are also related to string theory [28,29]. The QNMs of 1 + 1 dilatonic BH for scalar and fermionic perturbations were studied in [30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Scalar perturbations of two-dimensional Horava–Lifshitz black holes

et al. 2016

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In this article, we study the stability of black hole solutions found in the context of dilatonic Horava-Lifshitz gravity in 1 + 1 dimensions by means of the quasinormal modes approach. In order to find the corresponding quasinormal modes, we consider the perturbations of massive and massless scalar fields minimally coupled to gravity. In both cases, we found that the quasinormal modes have a discrete spectrum and are completely imaginary, which leads to damping modes. For a massive scalar field and a nonvanishing cosmological constant, our results suggest unstable behavior for large values of the scalar field mass.

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Section: Introductionmentioning

confidence: 99%

Scalar perturbations of two-dimensional Horava–Lifshitz black holes

et al. 2016

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“…Moreover, the study was extended to the Schwarzschild-de Sitter black hole by using the sixth-order WKB method [37], and the Dirac QNMs of the Reissner-Nordström de Sitter black hole was studied by using the Pöshl-Teller potential approximation [38]. Other interesting studies have been conducted in [39,40] for Lifshitz black holes, in [41] for new type black hole in three space-time dimensions, in [42] for a two-dimensional charged dilatonic black hole and in [43] for Chern-Simons and BTZ black holes with torsion.…”

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confidence: 99%

Perturbative and nonperturbative fermionic quasinormal modes of Einstein-Gauss-Bonnet-AdS black holes

2018

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In this work, we present the quasinormal modes of a fermionic field in the background of Gauss-Bonnet-AdS black holes. We find exact solutions for D = 5 at the fixed value α = R 2 /2 of the Gauss-Bonnet coupling constant, with R denoting the AdS radius, and we find numerical solutions for some range of values of the coupling constant α and D = 5, 6. Mainly, we find two branches of quasinormal frequencies, a branch perturbative in the Gauss-Bonnet coupling constant α, and another branch nonperturbative in α. The phenomena of nonperturbative modes, which seem to be quite general in theories with higher curvature corrections, have been obtained in the spectrum of gravitational field perturbations and scalar field perturbations in previous works. We show that it also arises for fermionic field perturbations and therefore seems to be independent of the spin of the field under consideration. However, in contrast to gravitational and scalar field perturbations, where the nonperturbative modes are purely imaginary, we find that for fermionic field perturbations the nonperturbative modes acquire a real part. We find that the imaginary part of the quasinormal frequencies is always negative in both branches; therefore, the spherical Gauss-Bonnet-AdS black holes are stable against fermionic field perturbations.

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