2012/03/22 by Hirotaka Yoshino, H. Yoshino, Hideo Kodama +1 · 5 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Quantum Electrodynamics and Casimir Effect #astro-ph.CO #gr-qc #hep-ph #hep-th #msc:83C57
paper · pdf · doi:10.1143/ptp.128.153
published as Prog. Theor. Phys. 128 (2012), 153-190 · 38 pages, 18 figures
arxiv created 2012/03/22 · crossref issued 2012/07/01 · crossref published 2012/07/01 · crossref published-print 2012/07/01 · openalex publication_date 2012/07/01 · crossref created 2012/07/20 · arxiv updated 2012/08/03 · openalex created_date 2016/06/24 · crossref deposited 2017/08/24 · crossref indexed 2026/07/26 · openalex updated_date 2026/07/28
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.