Probing the effective quantum gravity via quasinormal modes and shadows of black holes

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47813059%3A19630%2F25%3AA0000425" target="_blank" >RIV/47813059:19630/25:A0000425 - isvavai.cz</a>

Result on the web

<a href="https://journals.aps.org/prd/abstract/10.1103/PhysRevD.111.104055" target="_blank" >https://journals.aps.org/prd/abstract/10.1103/PhysRevD.111.104055</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevD.111.104055" target="_blank" >10.1103/PhysRevD.111.104055</a>

Result language

angličtina

Original language name

Probing the effective quantum gravity via quasinormal modes and shadows of black holes

Original language description

Two quantum-corrected black hole models have recently been proposed within the Hamiltonian constraints approach to quantum gravity, maintaining general covariance [Phys. Rev. D 111, L081504 (2025).]. We have studied in detail the quasinormal spectra of test fields and axial gravitational perturbations of these black holes using various methods. The two models differ in their choice of quantum parameter xi, and we can distinguish them by their quasinormal spectra. In the first model, increasing the quantum parameter results in higher real oscillation frequencies and damping rates of the fundamental mode. In contrast, the second model shows a decrease in the oscillation frequency of the least-damped mode when the quantum parameter is introduced. We have shown that, while the fundamental mode changes relatively gradually with the quantum parameter, the first few overtones deviate from their Schwarzschild limits at an increasing rate. This results in a qualitatively new behavior: the real parts of the frequencies of the first and higher overtones tend to zero as the quantum parameter increases. In addition to the branch of modes that are perturbative in the quantum parameter, we observe some nonperturbative modes at moderate values of the quantum parameter. Additionally, we have calculated the radii of the shadows cast by these black holes and discussed possible constraints based on observations of SgtA*. As a by-product, using the above two models of black holes and also quantum Oppenheimer-Snyder model [Phys. Rev. Lett. 130, 101501 (2023).], we tested the method of calculating quasinormal modes of this kind based on a recent parametrization of effective potentials, and showed that while the parametrized formalism could be used for estimating the fundamental mode at small values of the coupling, its accuracy is highly dependent on the particular spacetime under consideration and is insufficient even for the lowest overtones.

Czech name

—

Czech description

—

Type

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

CEP classification

—

OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

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

Name of the periodical

Physical Review D

ISSN

2470-0010

e-ISSN

2470-0029

Volume of the periodical

111

Issue of the periodical within the volume

10

Country of publishing house

US - UNITED STATES

Number of pages

20

Pages from-to

„104055-1“-„104055-20“

UT code for WoS article

001494567200003

EID of the result in the Scopus database

2-s2.0-105005537018