Professor Guofang Wei 题目：Sharp Fundamental Gap Estimate on Convex Domains of Sphere 报告人：Professor Guofang Wei (加州大学圣塔芭芭拉分校） 地点：致远楼102室 时间：2017年6月23日  PM 4:00-5:00 Abstract: In their celebrated work, B. Andrews and J. Clutterbuck proved the fundamental gap (the difference between the first two eigenvalues) conjecture for convex domains in the Euclidean space and conjectured similar results holds for spaces with constant sectional curvature. In several joint works with S.Seto, L. Wang; C. He; and  X. Dai, S.Seto,  we prove the conjecture for the sphere. Namely for any strictly convex domain in the unit $S^n$ sphere,  the gap is $\ge 3\frac{\pi^2}{D^2}$. As in B. Andrews and J. Clutterbuck's work, the key is to prove a super log-concavity of the first eigenfunction. 欢迎各位参加!