Testing Cosmic Censorship with Black Hole Collisions

Details Testing Cosmic Censorship with Black Hole Collisions Testing Cosmic Censorship with Black Hole Collisions

1993-07-12

arxiv.org/abs/gr-qc/9307014v1

Phys.Rev. D49 (1994) 840-852

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

30 pages, 8 figs., phyzzx

Scientific paper

10.1103/PhysRevD.49.840

There exists an upper limit on the mass of black holes when the cosmological constant $\Lambda$ is positive. We study the collision of two black holes whose total mass exceeds this limit. Our investigation is based on a recently discovered exact solution describing the collision of $Q=M$ black holes with $\Lambda > 0$. The global structure of this solution is analyzed. We find that if the total mass is less than the extremal limit, then the black holes coalesce. If it is greater, then a naked singularity forms to the future of a Cauchy horizon. However, the horizon is not smooth. Generically, there is a mild curvature singularity, which still allows geodesics to be extended. The implications of these results for cosmic censorship are discussed.

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