学术报告(郭俊起 7.18)

Critical phenomena in gravitational collapse

发布人:周妍 发布日期:2018-07-12
主题
Critical phenomena in gravitational collapse
活动时间
-
活动地址
新数学楼 415
主讲人
郭俊起 讲师(济南大学)

学术报告(郭俊起 7.18

 

题目:Critical phenomena in gravitational collapse

主讲人:郭俊起 讲师(济南大学

时间:2018718日下午1600——1700

地点:新数学楼 415

 

摘要:

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.

 

数学学院

2018710