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Quantitative maximal local rewinding volume rigidity with Ricci curvature bounded below
陈丽娜博士
Wednesday, September 20th, 2017, 1:00 PM 闵行校区第三教学楼314教室 

华东师范大学数学系几何研讨班
摘要: For a metric ball $B_r(x)$ in a Riemannian manifold, its local rewinding volume is the volume of $B_r(x^*)$, where $B_r(x^*)\subset (U^*, x^*)$, the (uncomplete) Riemannian universal cover of $(B_r(x), x)$. A compact manifold with Ricci curvature bounded below by $(n1)H$ is isometric to a space form with constant curvature $H$ if and only if every $\rho$ball ($\rho$ fixed) achieves the maximal local rewinding volume. In this talk, we will prove that if a compact manifold $M$ with Ricci curvature lower bound $(n1)H$ satisfies that the universal cover space $\tilde M$ is noncollapsing (there exist a positive lower bound of the volume of a unit ball in $\tilde M$) and each $\rho$ball almost achieves the maximal local rewinding volume, then this manifold is diffeomorphic and close to a space form with $H$constant curvature.
This is joint work with Xiaochun Rong and Shicheng Xu.



