College of Liberal Arts & Sciences

# Differential Geometry Seminar

Speaker:

Biao Ma

Topic:

"Almost rigidity results with lower Ricci bound by Cheeger & Colding"

**Abstract:**

Two basic rigidity theorems of nonnegative Ricci curvature manifolds are the maximum diameter theorem and the splitting theorem. Each of them asserts if some geometric quantity (diameter) is as large as possible then the metric has to be a warped product of a particular type. Cheeger-Colding 1996 and Colding 1996 showed that if some quantity is almost maximal then the almost rigidity result hold in the sense that the given space is close to the model space under Gromov-Hausdorff distance. I will report these results starting with some basic materials.

Event Date:

September 10, 2019 - 2:30pm to 3:30pm

Location:

221 MLH

Calendar Category:

Seminar

Seminar Category:

Differential Geometry