报告题目：Surface-Localized of Transmission Eigenfunctions in Sp…

报 告 人：张凯

时 间：2026年4月30日 （周四）下午15:30-16:30

地 点：国交2号楼315会议室

简 介：We present a comprehensive study of new discoveries on the spectral patterns of elastic transmission eigenfunctions, including boundary localization, surface resonance, and stress concentration. In the case where the domain is radial and the underlying parameters are constant, we give rigorous justifications and derive a thorough understanding of those intriguing geometric and physical patterns. We also derive sharp spectral density estimates establishing both lower and upper bounds to demonstrate that a significant proportion of transmission eigenfunctions manifest this surface-localizing behavior.

报告题目：Stability of optimal transport on metric measure space…

报 告 人：韩邦先

时 间：2026年4月23日（周四）上午11:00-12:00

地 点：国交2号楼315会议室

简 介：In joint works with Zhuonan Zhu, we prove several quantitative stability results concerning optimal transport: quantitative stability of Kantorovich potentials on metric measure spaces with lower Ricci curvature bound, quantitative stability of optimal transport maps and quantitative stability of Wasserstein barycenter on Alexandrov spaces. Our proof, which employs a heat kernel-regularization technique, is of independent interest and it is new even in the smooth setting.

报告题目：Gehring链的距离

报 告 人：葛剑

时 间：2026年4月23日（周四）上午10:00-11:00

地 点：国交2号楼315会议室

简 介：我们从欧氏空间中Gehring链问题出发，介绍Gromov在无穷维空间中的链问题，并借此引入Gromov诸多和正数量曲率相关的猜想。如果时间允许，将介绍我们在球面中类似问题的工作。