Description
We classify the geodesic classes of the exterior Kerr spacetime by performing a taxonomy
of inequivalent root structures of the first order radial geodesic equation using a novel
compact notation. The four generic root structures with only simple roots give rise to eight non-generic root structures when either one root becomes coincident with the horizon, one root vanishes or two roots becomes coincident. We derive the explicit phase space of all such degenerate root systems. In particular, we show that the separatrix describing root systems with double roots can be entirely described in terms of a single quartic. The separatrix is the union of three qualitatively distinct regions respectively obtained when (1) the pericenter of bound motion becomes a double root; (2) the eccentricity of bound motion becomes zero; (3) the turning point of unbound motion becomes a double root.
Introduction of the speaker:
2006-2010北京大学物理学院（理学学士）
2010-2015北京大学物理学院（理论物理博士）
2015-2018布鲁塞尔自由大学博士后
2018-2019亚太理论物理研究中心博士后
2019年9月受聘为华中科技大学物理学院副教授
Online Tencent/VOOV meeting:
https://meeting.tencent.com/s/ro0VnuofDXTj
会议 ID：535 525 434
