Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005ragt.meet..315t&link_type=abstract
In Proceedings of RAGtime 6/7: Workshops on black holes and neutron stars, Opava, 16-18/18-20 September, 2004/2005; S. Hledík an
Physics
4
Black Holes, Naked Singularities, Theory, Observations, X-Ray Variability
Scientific paper
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.
Stuchlik Zdenek
Torok Gabriel
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