J 2022

Quasinormal ringing of regular black holes in asymptotically safe gravity : the importance of overtones

KONOPLYA, Roman, Antonina Frantsivna ZINHAILO, J. KUNZ, Zdeněk STUCHLÍK, A. ZHIDENKO et. al.

Basic information

Original name

Quasinormal ringing of regular black holes in asymptotically safe gravity : the importance of overtones

Authors

KONOPLYA, Roman (804 Ukraine, belonging to the institution), Antonina Frantsivna ZINHAILO (804 Ukraine, belonging to the institution), J. KUNZ, Zdeněk STUCHLÍK (203 Czech Republic, belonging to the institution) and A. ZHIDENKO

Edition

Journal of Cosmology and Astroparticle Physics, GB - Spojené království Velké Británie a, 2022, 1475-7516

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10308 Astronomy

Country of publisher

United Kingdom of Great Britain and Northern Ireland

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

RIV identification code

RIV/47813059:19630/22:A0000187

Organization unit

Institute of physics in Opava

UT WoS

000879927800008

Keywords in English

Gravitational waves in GR and beyond; theory; modified gravity

Tags

International impact, Reviewed

Links

GA19-03950S, research and development project.
Změněno: 7/2/2023 14:13, Mgr. Pavlína Jalůvková

Abstract

V originále

Asymptotically safe gravity is based on the idea that the main contribution to the Schwarzschild-like black hole spacetime is due to the value of the gravitational coupling which depends on the distance from the origin and approaches its classical value in the far zone. However, at some stage this approach has an arbitrariness of choice of some identi-fication parameter. The two cases of identification are considered here: first, by the mod-ified proper length (the Bonanno-Reuter metric), and second, by the Kretschmann scalar (the metric for this case coincides, up to the redefinition of constants, with the Hayward metric). Even though the quasinormal modes of these metrics have been extensively stud-ied, a number of interesting points were missed. We have found that quasinormal modes are qualitatively similar for both types of identification. The deviation of the fundamental mode from its Schwarzschild limit may be a few times larger than it was claimed in the previous studies. The striking deviation from the Schwarzschild limit occurs for overtones, being as large as hundreds of percent even when the fundamental mode is almost coinciding with the Schwarzschild one. This happens because the above metrics are very close to the Schwarzschild one everywhere, except a small region near the event horizon, which is crucial for overtones. The spectrum of both metrics contains purely imaginary (non-oscillatory) modes, which, for some values of parameters, can appear already at the second overtone.