How short can the hair of a black hole be?

Details How short can the hair of a black hole be? How short can the hair of a black hole be?

1995-10-17

arxiv.org/abs/gr-qc/9510036v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

8 pages in Latex

Scientific paper

We show that in all theories in which black hole hair has been discovered, the region with non-trivial structure of the non-linear matter fields must extend beyond $3/ 2$ the horizon radius, independently of all other parameters present in the theory. We argue that this is a universal lower bound that applies in every theory where hair is present. This {\it no short hair conjecture} is then put forward as a more modest alternative to the now debunked {\it no hair conjecture}.

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