报告主题: Energy Casecade for Hamiltonian Nonlinear Klein-Gordon Equations
报 告 人: 雷震 教授 (复旦大学)
报告时间:2023年9月22日(星期五)上午9:20-10:20
报告地点:37号楼3A02
邀 请 人: 温焕尧 教授
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数学学院
2023年 9月19日
报告摘要:
In this talk we consider nonlinear Klein-Gordon equations with potential. We prove that spatially localized and time-periodic bound states of the linear problem may be destroyed by generic nonlinear Hamiltonian perturbations, via energy transfers from the discrete to continuum modes and slow radiation of energy to infinity. We explore the underlying mechanism (generalized Fermi's Golden Rule) of such phenomenon and give descriptions on the transfer rate in the full generality: small or large and single or multiple eigenvalues, high dimensional eigenspaces. This settles a long-standing problem raised in the paper of Soffer-Weinstein 1999, in which single and large eigenvalue case was first treated. This is a jiont work with my students Jie Liu and Zhaojie Yang.
报告人介绍:
雷震, 复旦大学数学科学学院教授、中国工业与应用数学学会副理事长,国家杰出青年科学基金获得者、国家级人才计划入选者。长期在流体力学领域从事前沿基础理论研究,提出了“强零条件”的概念,发现了不可压流体的非线性内蕴结构并独自建立了不可压弹性与粘弹方程组解的整体稳定性理论,在不可压NS方程组等领域有杰出贡献,获得了国内外同行的高度评价。2020年获国家自然科学奖二等奖(排名第1),2022年荣获第四届“科学探索奖”、上海市科技精英等荣誉。