中科院数学与系统科学研究院

数学研究所

学术报告

拓扑研讨班

报告人：桂弢（数学所）   

题  目：Shadows of Hodge Theory     (or: Never Underestimate Symmetry!)

时  间：2022.09.21（星期三）下午14:30-16:30

地  点：数学院南楼N802

摘  要：This talk aims to advertise a pattern/phenomenon that has emerged in many different mathematical areas during the past decades but is not currently well-understood. I will begin with a broad overview of the Kahler packages (Poincare duality, Hard Lefschetz, and Hodge-Riemann relations) that appear in geometry, algebra, and combinatorics, from the classics of Lefschetz to the recent work of this year's Fields medalist June Huh, in a down-to-earth way. Then I will discuss two new Kahler packages we discovered that are equivariant and have no geometric origin. The equivariant log-concavity in representation theory hints at our discoveries. This talk will be non-technical and accessible to the general audience: nothing will be assumed other than elementary linear algebra. Partly based on joint work with Rui Xiong.