KOLOŠ, Martin and Zdeněk STUCHLÍK. String loops oscillating in the field of Kerr black holes as a possible explanation of twin high-frequency quasiperiodic oscillations observed in microquasars. Physical Review D. US - Spojené státy americké, 2014, vol. 89, No 6, p. "065007-1"-"065007-18", 18 pp. ISSN 1550-7998. Available from: https://dx.doi.org/10.1103/PhysRevD.89.065007.
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Basic information
Original name String loops oscillating in the field of Kerr black holes as a possible explanation of twin high-frequency quasiperiodic oscillations observed in microquasars
Authors KOLOŠ, Martin and Zdeněk STUCHLÍK.
Edition Physical Review D, US - Spojené státy americké, 2014, 1550-7998.
Other information
Original language English
Type of outcome Article in a journal
Field of Study 10308 Astronomy
Confidentiality degree is not subject to a state or trade secret
WWW www
Organization unit Faculty of Philosophy and Science in Opava
Doi http://dx.doi.org/10.1103/PhysRevD.89.065007
UT WoS 000333106900014
Keywords in English X-ray binaries; accretion discs; test particles; RE J1034+396; flux tubes; motion; spin; GRS-1915+105
Tags UF
Tags International impact, Reviewed
Links EE2.3.20.0071, research and development project. GB14-37086G, research and development project.
Changed by Changed by: Mgr. Pavlína Jalůvková, učo 25213. Changed: 26/1/2021 14:05.
Abstract
Small oscillations of current-carrying string loops around stable equilibrium positions corresponding to minima of the effective potential in the equatorial plane of the Kerr black holes are studied using the perturbation method. In the lowest approximation, two uncoupled harmonic oscillators are obtained that govern the radial and vertical oscillations; the higher-order terms determine nonlinear phenomena and transition to chaotic motion through quasiperiodic stages of the oscillatory motion. The radial profiles of frequencies of the radial and vertical harmonic oscillations that are also relevant in the quasiperiodic stages of the oscillatory motion are given, and their properties, independent of the spin of the black holes and the angular momentum and tension of the string loops, are determined. It is shown that the radial profiles differ substantially from those corresponding to the radial and vertical frequencies of the geodetical epicyclic motion; however, they have the same mass
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