报告题目：Improved Uniform Error Bounds on Time-splitting Methods for Long-time Dynamics of Dispersive PDEs

时间：6月2日周五上午9:30 － 10:30；

地点：数学楼2-1会议室

报告人：冯悦，法国索邦大学

Abstract: In this talk, I begin with the nonlinear Klein-Gordon equation (NKGE) with weak nonlinearity, which is characterized by a small dimensionless parameter. Different numerical methods are applied to discretize the NKGE including finite difference methods, exponential wave integrators and time-splitting methods. Especially, we discretize the NKGE by the second-order time-splitting method in time and combine with the Fourier spectral method in space. By introducing a new technique--Regularity Compensation Oscillation (RCO) which controls the high frequency modes by the regularity of the exact solution and analyzes the low frequency modes by phase cancellation and energy method, we carry out the improved uniform error bounds for the time-splitting methods. The results have been extended to other dispersive PDEs including the (nonlinear) Schrodinger equation and Dirac equation.

个人简介：冯悦，法国索邦大学Jacques-Louis Lions实验室博士后。冯悦博士于2014年和2017年在浙江大学取得学士和硕士学位，于2020年在新加坡国立大学取得博士学位，师从包维柱教授，随后在新加坡国立大学及法国索邦大学从事博士后研究。冯悦博士近年来致力于色散偏微分方程的数值求解方法及分析方面的研究，主要关注长时间动力学和高振荡问题的算法设计及误差估计。目前，已在SIAM J. Numer. Anal., Math. Comp., J. Sci. Comp.等学术期刊上发表论文十余篇。