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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47813059%3A19630%2F22%3AA0000187" target="_blank" >RIV/47813059:19630/22:A0000187 - isvavai.cz</a>

Result on the web

<a href="https://iopscience.iop.org/article/10.1088/1475-7516/2022/10/091" target="_blank" >https://iopscience.iop.org/article/10.1088/1475-7516/2022/10/091</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1475-7516/2022/10/091" target="_blank" >10.1088/1475-7516/2022/10/091</a>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

<a href="/en/project/GA19-03950S" target="_blank" >GA19-03950S: Testing strong gravity via black holes</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Cosmology and Astroparticle Physics

ISSN

1475-7516

e-ISSN

—

Volume of the periodical

2022

Issue of the periodical within the volume

10

Country of publishing house

GB - UNITED KINGDOM

Number of pages

21

Pages from-to

„091-1“-„091-21“

UT code for WoS article

000879927800008

EID of the result in the Scopus database

2-s2.0-85141800417