中国科学院数学与系统科学研究院
数学研究所
中国科学院华罗庚数学重点实验室
华罗庚青年数学论坛
学术报告
报告人: 陈旭佳 博士 (哈佛大学)
题 目:Open Gromov-Witten theory and bounding chains
时 间:2023.09.11(星期一),09:00-10:00
地 点:Zoom会议:857 9156 8842 密码:0911
摘 要:Gromov-Witten invariants count “closed” J-holomorphic curves—closed surfaces, e.g. spheres, tori. Open Gromov-Witten invariants, on the other hand, count “open” J-holomorphic curves---surfaces with boundary, e.g., disks, annuli. Unlike their “closed” counterpart, open Gromov-Witten invariants are often not well-defined. One beautiful way of defining them, due to Fukaya-Oh-Ohta-Ono, is “bounding chains”. I will give an introduction to open Gromov-Witten invariants, bounding chains, and my work that says two seemingly-unrelated definition of open Fromov-Witten invariants are actually the same when they are both defined.
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报告人: 陈旭佳 博士 (哈佛大学)
题 目:Kontsevich’s invariants as topological invariants of configuration space bundles
时 间:2023.09.13(星期三),09:00-10:00
地 点:Zoom会议:837 7933 5082 密码:0913
摘 要:Kontsevich's invariants (also called “configuration space integrals”) are invariants of certain framed smooth manifolds/fiber bundles. The result of Watanabe(’18) showed that Kontsevich’s invariants can distinguish smooth fiber bundles that are isomorphic as topological fiber bundles. I will first give an introduction to Kontsevich's invariants, and then state my work which provides a perspective on how to understand their ability of detecting exotic smooth structures: real blow up operations essentially depends on the smooth structure, and thus given a space/bundle X, the topological invariants of some spaces/bundles obtained by doing some real blow-ups on X can be different for different smooth structures on X.