主 讲 人：Prof. Alain Chenciner（巴黎七大，巴黎天文台）

时间地点：

6月3日（周一）下午2:00-4:00 北一文科楼707

6月5日（周三）下午2:00-4:00 北一文科楼5056月8日（周六）上午9:00-11:00 北一文科楼206

6月13日（周四）下午2:00-4:00 北一文科楼708

摘    要：The course is an introduction to some aspects of the three-body problem, in particular the existence of “quasi-collision solutions” which are collision-free but come arbitrarily close to collisions. In the phase space, such solutions belong to KAM invariant tori of the regularized system. I shall mainly focus on the planar circular restricted 3-body problem in the lunar case and its reduction, after regularization, to a twist map on an annulus. At the end, I shall give a hint of the existing results for the full 3-body problem in a space of dimension 2 or 3.