Can quantum mechanics fool the cosmic censor?

Details Can quantum mechanics fool the cosmic censor? Can quantum mechanics fool the cosmic censor?

2009-05-07

arxiv.org/abs/0905.1077v1

Phys.Rev.D79:101502,2009

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

5 pages, to appear as a Rapid Communication in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.79.101502

We revisit the mechanism for violating the weak cosmic-censorship conjecture (WCCC) by overspinning a nearly-extreme charged black hole. The mechanism consists of an incoming massless neutral scalar particle, with low energy and large angular momentum, tunneling into the hole. We investigate the effect of the large angular momentum of the incoming particle on the background geometry and address recent claims that such a back-reaction would invalidate the mechanism. We show that the large angular momentum of the incident particle does not constitute an obvious impediment to the success of the overspinning quantum mechanism, although the induced back-reaction turns out to be essential to restoring the validity of the WCCC in the classical regime. These results seem to endorse the view that the "cosmic censor" may be oblivious to processes involving quantum effects.

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