Abstract
The effective potential of the equatorial circular geodesics in Kerr metric show a sharp discontinuity from positive to negative values, when a→m. It is shown that when a is in the small range 1.088 m > a > m, stable circular orbits exist with negative energy (with respect to infinity); this implies that, if accretion takes place, a Kerr naked singularity is slowed down. The efficiency of this process increases as a→m. Therefore, in the above range of a, Kerr naked singularities should decay to a black-hole state.
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de Felice, F. Classical instability of a naked singularity. Nature 273, 429–431 (1978). https://doi.org/10.1038/273429a0
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DOI: https://doi.org/10.1038/273429a0
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