Bosenova collapse of axion cloud around a rotating black hole

Details Bosenova collapse of axion cloud around a rotating black hole Bosenova collapse of axion cloud around a rotating black hole

2012-03-22

arxiv.org/abs/1203.5070v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

38 pages, 18 figures

Scientific paper

Motivated by possible existence of stringy axions with ultralight mass, we study the behavior of an axion field around a rapidly rotating black hole (BH) obeying the sine-Gordon equation by numerical simulations. Due to superradiant instability, the axion field extracts the rotational energy of the BH and the nonlinear self-interaction becomes important as the field grows larger. We present clear numerical evidences that the nonlinear effect leads to a collapse of the axion cloud and a subsequent explosive phenomena, which is analogous to the "bosenova" observed in experiments of Bose-Einstein condensate. The criterion for the onset of the bosenova collapse is given. We also discuss the reason why the bosenova happens by constructing an effective theory of a wavepacket model under the nonrelativistic approximation.

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