Greybody factors of massive charged fermionic fields in a charged two-dimensional dilatonic black hole

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

doi:10.1140/epjc/s10052-015-3292-1

Cited by 3 publications

(1 citation statement)

References 39 publications

(43 reference statements)

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“…In addition, the absorption cross section is not null and it diverges in the low-frequency limit and tends to zero in the high-frequency limit. It is worth to mention that for certain values of the frequency ω ≈ 1.34, 2.70, 3.86, 4.95, 6.02, 7.07, 8.11, for q = 0.1, and ω ≈ 0.04, 1.11, 2.47, 3.62, 4.72, 5.79, 6.84, 7.88, 8.92, for q = −0.1, the absorption cross section is null; this oscillatory behavior has not been observed in other geometries, (see for instance [92][93][94][95][96][97]). The discrete values of ω for which the transmission coefficient and the absorption cross section are zero can be found from the condition c − a − b = −n, which yields…”

Section: Reflection and Transmission Coefficients And Absorption Cmentioning

confidence: 99%

Hawking radiation and propagation of massive charged scalar field on a three-dimensional Gödel black hole

et al. 2018

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In this paper we consider the three-dimensional Gödel black hole as a background and we study the vector particle tunneling from this background in order to obtain the Hawking temperature. Then, we study the propagation of a massive charged scalar field and we find the quasinormal modes analytically, which turns out be unstable as a consequence of the existence of closed time-like curves. Also, we consider the flux at the horizon and at infinity, and we compute the reflection and transmission coefficients as well as the absorption cross section. Mainly, we show that massive charged scalar waves can be superradiantly amplified by the three-dimensional Gödel black hole and that the coefficients have an oscillatory behavior. Moreover, the absorption cross section is null at the high frequency limit and for certain values of the frequency.

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Section: Reflection and Transmission Coefficients And Absorption Cmentioning

confidence: 99%

Hawking radiation and propagation of massive charged scalar field on a three-dimensional Gödel black hole

et al. 2018

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Exact scalar (quasi-)normal modes of black holes and solitons in gauged SUGRA

Monserrat

Hernández

Mena

et al. 2022

J. High Energ. Phys.

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In this paper we identify a new family of black holes and solitons that lead to the exact integration of scalar probes, even in the presence of a non-minimal coupling with the Ricci scalar which has a non-trivial profile. The backgrounds are planar and spherical black holes as well as solitons of SU (2) × SU (2) $$ \mathcal{N} $$ N = 4 gauged supergravity in four dimensions. On these geometries, we compute the spectrum of (quasi-)normal modes for the non-minimally coupled scalar field. We find that the equation for the radial dependence can be integrated in terms of hypergeometric functions leading to an exact expression for the frequencies. The solutions do not asymptote to a constant curvature spacetime, nevertheless the asymptotic region acquires an extra conformal Killing vector. For the black hole, the scalar probe is purely ingoing at the horizon, and requiring that the solutions lead to an extremum of the action principle we impose a Dirichlet boundary condition at infinity. Surprisingly, the quasinormal modes do not depend on the radius of the black hole, therefore this family of geometries can be interpreted as isospectral in what regards to the wave operator non-minimally coupled to the Ricci scalar. We find both purely damped modes, as well as exponentially growing unstable modes depending on the values of the non-minimal coupling parameter. For the solitons we show that the same integrability property is achieved separately in a non-supersymmetric solutions as well as for the supersymmetric one. Imposing regularity at the origin and a well defined extremum for the action principle we obtain the spectra that can also lead to purely oscillatory modes as well as to unstable scalar probes, depending on the values of the non-minimal coupling.

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Quasinormal modes and greybody factors of f(R) gravity minimally coupled to a cloud of strings in 2+1 dimen

Овгун

Jusufi

2018

Annals of Physics

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Greybody factors of massive charged fermionic fields in a charged two-dimensional dilatonic black hole

Cited by 3 publications

References 39 publications

Hawking radiation and propagation of massive charged scalar field on a three-dimensional Gödel black hole

Hawking radiation and propagation of massive charged scalar field on a three-dimensional Gödel black hole

Exact scalar (quasi-)normal modes of black holes and solitons in gauged SUGRA

Quasinormal modes and greybody factors of f(R) gravity minimally coupled to a cloud of strings in 2+1 dimen

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