{"id":944,"date":"2015-06-02T21:11:47","date_gmt":"2015-06-02T12:11:47","guid":{"rendered":"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/seminar\/944\/"},"modified":"2015-06-02T21:11:47","modified_gmt":"2015-06-02T12:11:47","slug":"20150519_kodama","status":"publish","type":"seminar","link":"https:\/\/www.kmi.nagoya-u.ac.jp\/eng\/seminar\/944\/","title":{"rendered":"Non-linear dynamics of axion clouds around a rotating black hole and its observation by gravitational waves"},"content":{"rendered":"

In these five years, we have continued the investigation of the dynamical evolution of\u00a0superradiantly unstable axion clouds around a Kerr black hole taking account of non-linear selfinteraction\u00a0<\/span>of the axion field by a 3D relativistic numerical simulations. As a result, we have realized\u00a0<\/span>repeated occurrence of bosenova collapse and superradiant growth of an axion cloud by numerical\u00a0<\/span>simulations for the first time and clarified its features quantitatively. Further, on the basis of that, we\u00a0<\/span>have calculated gravitational wave emissions from the axion cloud and pointed out that we can get\u00a0<\/span>strong constraints on the mass and decay constant for string axions by the current and future\u00a0<\/span>observations of gravitational waves from a black hole in a binary inside our Galaxy, such as the\u00a0<\/span>Cygnux X1, and the massive black hole at the Sagitarius A. In this talk, I will overview these results\u00a0<\/span>including that of our recent work on axion clouds with multiple unstable modes simultaneously\u00a0<\/span>excited. <\/span>
<\/span><\/p>\n

References<\/p>\n

[1] “Probing the string axiverse by gravitational waves from Cygnus X-1”<\/p>\n

Hirotaka Yoshino, Hideo Kodama: arXiv:1407.2030.<\/span><\/p>\n

[2] “Gravitational radiation from an axion cloud around a black hole: Superradiant phase”<\/p>\n

Hirotaka Yoshino, Hideo Kodama: PTEP 2014 (2014) 043E02 [arXiv:1312.2326].<\/p>\n

[3] “Axiverse and Black Hole”<\/p>\n

Hideo Kodama, Hirotaka Yoshino: Int. J. Mod. Phys. Conf. Ser. 7 (2012) 84-115 [arXiv:1108.1365].<\/span><\/p>\n

[4] “Exploring the String Axiverse with Precision Black Hole Physics”<\/p>\n

Asimina Arvanitaki, Sergei Dubovsky: Phys.Rev. D83 (2011) 044026 [arXiv:1004.3558].<\/p>\n

[5] “String Axiverse”<\/p>\n

A. Arvanitaki, S. Dimopoulos, S. Dubovsky, N. Kaloper, J. March-Russell: Phys.Rev. D81 (2010)\u00a0123530 [arXiv:0905.4720].<\/span><\/p>\n","protected":false},"featured_media":0,"template":"","tags":[],"seminar_category":[53],"acf":{"s_now_accepting":true,"s_date_order":"2015-05-19 13:00:00","s_date_end":null,"s_date_text":"","s_text":"Hideo Kodama","s_place":"KMI Science Symposia (ES635)","s_place_other":"","s_categoryother":"","s_poster":"

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As a result, we have realized\u00a0repeated occurrence of bosenova collapse and superradiant growth of an axion cloud by numerical\u00a0simulations for the first time and clarified its features quantitatively. 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