Publication date: Dec 2005
Abstract:
Relativistic Keplerian orbital frequency (νK) and the
related epicyclic frequencies (radial νr, vertical
νθ) play an important role in the physics of
accretion discs orbiting Kerr black holes. We examine in detail their
properties in Kerr spacetimes and discuss some possible observational
implications resulting from their behaviour in the black hole case.
Characteristics of the fundamental orbital frequencies of Keplerian
motion are also analysed with the intention to find the phenomena which
could observationally distinguish a hypothetical naked singularity from
black holes. We explore the significant differences in behaviour of the
epicyclic frequencies. These suggest that oscillations of discs orbiting
Kerr black holes and naked singularities could be very different, and
the information, given through X-ray variability of the source, could
distinguish between the naked singularities and the black holes in
general.
Authors:
Török, Gabriel; Stuchlík, Zdeněk;