J 2024

Epicyclic Oscillations and Circular Orbits in Hairy Black Holes: Testing by High-Frequency Quasi-Periodic Oscillations Observed in Microquasars

VRBA, Jaroslav

Basic information

Original name

Epicyclic Oscillations and Circular Orbits in Hairy Black Holes: Testing by High-Frequency Quasi-Periodic Oscillations Observed in Microquasars

Authors

VRBA, Jaroslav (203 Czech Republic, guarantor, belonging to the institution)

Edition

Physics of the Dark Universe, 2024, 2212-6864

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10308 Astronomy

Country of publisher

Switzerland

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

Impact factor

Impact factor: 5.500 in 2022

Organization unit

Institute of physics in Opava

UT WoS

001151079600001

Keywords in English

hairy spacetime;high-frequency quasi-periodic oscillations;microquasar

Tags

Tags

International impact, Reviewed
Změněno: 16/1/2025 12:07, Mgr. Pavlína Jalůvková

Abstract

V originále

Recently, Ovalle and his collaborators proposed an exact solution to Einstein's equations. In this study, we investigate the main characteristics of the spherically symmetric spacetime determined by the hair parameter l, with a specific focus on circular orbits, particularly the innermost circular orbits (ISCOs), and the epicyclic oscillatory motion along these orbits. To assess the validity of this novel geometry, we employ the frequencies derived from the epicyclic resonance model of high-frequency quasi-periodic oscillations (HF QPOs) observed in microquasars, as well as the ISCOs. By analyzing the observed data from three selected microquasars, we establish constraints on the parameter l. Our findings suggest that this geometric framework can encompass the phenomena associated with HF QPOs and offer a partial explanation for the observed shift in the ISCOs, which is commonly attributed to the rotation of the black hole.