English

A note on Hang-Wang's hemisphere rigidity theorem

Differential Geometry 2019-11-26 v2

Abstract

Let (M,g)(M,g) be a compact manifold with boundary and Ricg(n1)gRic_g\geq (n-1)g, Hang and Wang proved that (M,g)(M,g) is isometric to the standard hemisphere if M\partial M is convex and isometric to Sn1(1)\mathbb{S}^{n-1}(1). We prove some rigidity theorems when M\partial M is isometric to a product manifold where one factor is the standard sphere.

Keywords

Cite

@article{arxiv.1905.01870,
  title  = {A note on Hang-Wang's hemisphere rigidity theorem},
  author = {Mijia Lai},
  journal= {arXiv preprint arXiv:1905.01870},
  year   = {2019}
}
R2 v1 2026-06-23T08:57:47.374Z