Do naked singularities generically occur in generalized theories of gravity?

Details Do naked singularities generically occur in generalized theories of gravity? Do naked singularities generically occur in generalized theories of gravity?

1998-10-27

arxiv.org/abs/gr-qc/9810081v1

Phys.Rev.Lett.81:5270-5273,1998

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages including 2 eps figures, to be published in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.81.5270

A new mechanism for causing naked singularities is found in an effective superstring theory. We investigate the gravitational collapse in a spherically symmetric Einstein-Maxwell-dilaton system in the presence of a pure cosmological constant "potential", where the system has no static black hole solution. We show that once gravitational collapse occurs in the system, naked singularities necessarily appear in the sense that the field equations break down in the domain of outer communications. This suggests that in generalized theories of gravity, the non-minimally coupled fields generically cause naked singularities in the process of gravitational collapse if the system has no static or stationary black hole solution.

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