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

Gabriel Torok, Zdenek Stuchlik

Relativistic Keplerian orbital frequency and related epicyclic frequencies play an important role in physics of accretion discs orbiting Kerr black holes and can by resonant or tra…