2005
Radial and vertical epicyclic frequencies of Keplerian motion in the field of Kerr naked singularities - Comparison with the black hole case and possible instability of naked-singularity accretion discs
TÖRÖK, Gabriel and Zdeněk STUCHLÍKBasic information
Original name
Radial and vertical epicyclic frequencies of Keplerian motion in the field of Kerr naked singularities - Comparison with the black hole case and possible instability of naked-singularity accretion discs
Authors
Edition
ASTRONOMY & ASTROPHYSICS, LES ULIS CEDEX A, EDP SCIENCES S A, 2005, 0004-6361
Other information
Language
English
Type of outcome
Article in a journal
Confidentiality degree
is not subject to a state or trade secret
Impact factor
Impact factor: 4.223
Organization unit
Faculty of Philosophy and Science in Opava
UT WoS
000230210100006
Keywords in English
black holes physics; X-rays : general
Tags
Tags
International impact, Reviewed
Changed: 12/4/2021 14:13, RNDr. Kateřina Klimovičová, Ph.D.
Abstract
In the original language
Relativistic Keplerian orbital frequency (v(K)) and related epicyclic frequencies (radial v(r), vertical v(theta)) play an important role in the physics of accretion discs orbiting Kerr black holes - quasiperiodic oscillations observed in microquasars can be explained by associated resonant or trapping effects. Because of growing theoretical evidence of the possible existence of naked singularities, we discuss the behaviour of the fundamenal orbital frequencies for Keplerian motion in the field of Kerr naked singularities, primarily in order to find phenomena that could observationally distinguish a hypothetical naked singularity from black holes. Some astrophysically important consequences are sketched, namely the existence of strong resonant frequency for all Kerr naked singularities, with radial and vertical epicyclic frequencies equal and given by the relation omega(sr) = a(-2) root a(2)-1 (a(2) + 1)-(1).