KONOPLYA, Roman. Quasinormal modes and grey-body factors of regular black holes with a scalar hair from the Effective Field Theory. Journal of Cosmology and Astroparticle Physics. GB - Spojené království Velké Británie a, 2023, vol. 2023, No 7, p. "001-1"-"001-15", 15 pp. ISSN 1475-7516. Available from: https://dx.doi.org/10.1088/1475-7516/2023/07/001.
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Basic information
Original name Quasinormal modes and grey-body factors of regular black holes with a scalar hair from the Effective Field Theory
Authors KONOPLYA, Roman (804 Ukraine, guarantor, belonging to the institution).
Edition Journal of Cosmology and Astroparticle Physics, GB - Spojené království Velké Británie a, 2023, 1475-7516.
Other information
Original language English
Type of outcome Article in a journal
Field of Study 10308 Astronomy
Country of publisher United Kingdom of Great Britain and Northern Ireland
Confidentiality degree is not subject to a state or trade secret
WWW URL
RIV identification code RIV/47813059:19630/23:A0000282
Organization unit Institute of physics in Opava
Doi http://dx.doi.org/10.1088/1475-7516/2023/07/001
UT WoS 001108894900010
Keywords in English Gauss-Bonnet-Lovelock-Horndeski-Palatini etc gravity theories;Gravitational waves in GR and beyond;theory;gravity;modified gravity
Tags RIV24, UF
Tags International impact, Reviewed
Changed by Changed by: Mgr. Pavlína Jalůvková, učo 25213. Changed: 16/1/2024 13:53.
Abstract
The Effective Field Theory (EFT) of perturbations on an arbitrary background geometry with a timelike scalar profile has been recently constructed in the context of scalar -tensor theories. Unlike General Relativity, the regular Hayward metric is realized as an exact background metric in the Effective Field Theory with timelike scalar profile without resorting to special matter field, such as nonlinear electrodynamics. The fundamental quasinormal mode for axial graviational perturbations of this black hole has been considered recently with the help of various methods. Here we make a further step in this direction and find that, unlike the fundamental mode, a few first overtones deviate from their Schwarzschild limit at a much higher rate. This outburst of overtones occurs because the overtones are extremely sensitive to the least change of the near-horizon geometry. The analytical formula for quasinormal modes is obtained in the eikonal regime. In addition, we calculated grey-body factors and showed that the regular Hayward black hole with a scalar hair has a smaller grey-body factor than the Schwarzschild one. Integration of the wave-like equation in the time-domain shows that the power-law tails, following the ring-down phase, are indistinguishable from the Schwarzschild ones at late times.
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