Bosenova Collapse of Axion Cloud around a Rotating Black Hole(Astrophysics and Cosmology)
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概要
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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.
- 2012-07-25
著者
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小玉 英雄
Kek Tsukuba Jpn
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KODAMA Hideo
Department of Physics, College of Liberal Arts and Sciences Kyoto University
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KODAMA Hideo
IPNS, KEK and the Graduate University of Advanced Studies
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Kodama Hideo
Theory Center Institute Of Particle And Nuclear Studies Kek:department Of Particles And Nuclear Phys
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Yoshino Hirotaka
Theory Center Institute Of Particles And Nuclear Studies Kek
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Kodama Hideo
Theory Center Institute Of Particles And Nuclear Studies Kek:department Of Particle And Nuclear Physics Graduate University For Advanced Studies
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KODAMA Hideo
Department of Physics, Osaka University : Department of Physics, Kyoto University
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KODAMA Hideo
Theory Center, Institute of Particles and Nuclear Studies, KEK
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KODAMA Hideo
Yakawa Institute for Theoretical Physics, Kyoto University
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KODAMA Hideo
Theory Center, Institute of Particles and Nuclear Studies, KEK:Department of Particle and Nuclear Physics, Graduate University for Advanced Studies
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KODAMA Hideo
Theory Center, Institute of Particle and Nuclear Studies, KEK:Department of Particles and Nuclear Physics, The Graduate University for Advanced Studies
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