3:00 p.m., Wednesday (March 11, 2009)


Yongbin Ruan
University of Michigan

Integrable hierarchies and singularity theory

Abstract: Almost twenty years ago, the celebrated theorem of Witten-Kontsevich asserted that the intersection theory of Deligne-Mumford space is governed by KdV-hierarchies. Around the same time, Witten proposed a sweeping generalization which leads to the representation theory of infinite dimensional Lie algebras and singularity theory. In the talk, we will sketch the recent resolution of Witten's vision by Fan-Jarvis and the author and the appearance of new phenomena such as mirror symmetry in the integrable hierarchy problem.

Refreshments will be served at 2:45 p.m. (1st Flr Lounge at PIMS).

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