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;