题目：Toric Einstein 4-manifolds with nonnegative sectional curvature      

报告人：刘天约(北京大学)    

摘要：We study some interesting curvature properties of Einstein 4 manifolds in the presence of symmetry. In particular we show that the only T^2 invariant Einstein metrics with nonnegative sectional curvature on closed 1-connected four manifolds are the known examples: the round metric on S^4, the Fubini-Study metric on CP^2, or the product metric on S^2×S^2.    

报告时间：2024年8月23日（周五）上午9:20-10:20

报告地点：教二楼613    

联系人：戎小春 胥世成