Academy of Mathematics and Systems Science, CAS Colloquia & Seminars
Speaker:
郭俊起 教授, 济南大学物理系
Inviter:
Title:
Critical phenomena in gravitational collapse
Time & Venue:
2018.9.21 10:00-11:00 N210
Abstract:
Critical collapse of a massless scalar field in spherical symmetry is systematically studied. Regarding the methodology, we combine numerical simulations and asymptotic analysis, and synthesize critical collapse, spacetime singularities, and complex science. Approximate analytic information on critical collapse is obtained. The spacetime near the center is nearly conformally flat. The slopes for the metric components and the scalar field versus the logarithm of the proper time are at the same order of magnitude as those in black hole formation. In this sense, a rough analytic explanation to the values of these slopes is given for the first time. The results show that the dynamics is not described by the Kasner solution. It is speculated that the scalar field in critical collapse may be a special standing wave.