Bosenova Collapse of Axion Cloud around a Rotating Black Hole
Abstract
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.
- Publication:
-
Progress of Theoretical Physics
- Pub Date:
- July 2012
- DOI:
- 10.1143/PTP.128.153
- arXiv:
- arXiv:1203.5070
- Bibcode:
- 2012PThPh.128..153Y
- Keywords:
-
- General Relativity and Quantum Cosmology;
- Astrophysics - Cosmology and Extragalactic Astrophysics;
- High Energy Physics - Phenomenology;
- High Energy Physics - Theory;
- 83C57
- E-Print:
- 38 pages, 18 figures