报告人：Tianyue Liu（宾夕法尼亚大学）
时间：2024年5月10日 09：30-10：30
地点：腾讯会议号：942 663 0176，无需密码
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 $\C P^2$, or the product metric on $S^2\times S^2$.
