Critical phenomena in gravitational collapse

主讲人 (Speaker): 
郭俊起
主讲人单位 (Speaker's Institute): 
济南大学
邀请人 (Invited by): 
林伟鹏
时间 (Time): 
星期二, 2018/07/17 - 15:00 to 16:00
地点 (Location): 
珠海校区海滨红楼17栋107 (Rm 107, Red House 17)
摘要 (Abstract): 

        Critical collapse in spherical symmetry is studied in double-null coordinates with numerical and approximate analytic approaches. The amplitude of the scalar field is about 0.6. The ratio between the amplitude and the period of the scalar field is about 0.15~0.2. Approximate analytic information on the metric components and the scalar field is obtained, and the metric components can be well fit by a typical log-periodic formula in complex science. The spacetime near the center is found to be nearly conformally flat. The Belinskii, Khalatnikov, and Lifshitz conjecture is examined in critical collapse, and the results show that the dynamics near the center is not described by the Kasner solution. It is conjectured that the scalar field in critical collapse may be a special standing wave.

主讲人简介 (Speaker's CV): 
郭俊起,2001年获得烟台师范学院理学学士,2004年获得华中科技大学理学硕士,2008年获得美国密西西比大学理论物理硕士,2014年8月获得加拿大Simon Fraser大学理论物理博士学位。2014年9月至2016年8月为Tata Institute of Fundamental Research博士后。2016年9月任济南大学物理科学与技术学院讲师。