Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2011-05-15
Phys.Rev.D84:044030,2011
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
48 pages, 40 figures, 3 Tables. To be published PRD. This work follows the paper Phys. Rev. D Vol.83, No.2 with DOI: 10.1103
Scientific paper
10.1103/PhysRevD.84.044030
We analyze the properties of circular orbits of test particles on the equatorial plane of a rotating central mass whose gravitational field is described by the Kerr spacetime. For rotating black holes and naked singularities we explore all the spatial regions where circular orbits can exist and analyze the behavior of the energy and the angular momentum of the corresponding test particles. In particular, we find all the radii at which a test particle can have zero angular momentum due to the repulsive gravity effects generated by naked singularities. We classify all the stability zones of circular orbits. It is shown that the geometric structure of the stability zones of black holes is completely different from that of naked singularities.
Pugliese Daniela
Quevedo Hernando
Ruffini Remo
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