报告题目 (Title)：The limit from Vlasov-Poisson system to KdV/ZK equations（从Vlasov-Poisson系统到KdV/ZK方程的极限）
报告人 (Speaker)： 杨雄锋教授（上海交通大学）
报告时间 (Time)：2025年11月17日（周一）15:00
报告地点 (Place)：校本部GJ303
邀请人(Inviter)：王宇澄
报告摘要：This talk presents the long wavelength approximation limit of the Vlasov-Poisson (VP) system in torus. We derive formally two-directional wave packets as the solutions of Korteweg-de Vries (KdV) equations from 1-D VP system, the two distinct wave packets as the solutions of Zakharov-Kuznetsov (ZK) equations from 3-D VP system with magnetic field, and the two-way waves as the solutions to the corresponding Kadomtsev-Petviashvili equations from 2-D VP system without magnetic field. A rigorous justification of this long-wave limit is established by the relative entropy method. It is a joint work with Dr. Zhao Lixian.