Department of Mathematics

Geometry and Topology

  •  Roger Casals, UC Davis
  •  Lagrangian Fillings of Legendrian links: Two Constructions in Floer Theory
  •  03/09/2021
  •  2:50 PM - 3:40 PM
  •  Online (virtual meeting) (Virtual Meeting Link)
  •  Honghao Gao (

In this talk I will review our current understanding in the classification of Lagrangian fillings for Legendrian links in the standard contact 3-sphere. The talk will present two illustrative constructions: one explaining how to build and detect infinitely many Lagrangian fillings using the Legendrian Contact DGA, and the other explaining how to classify fillings for the Hopf link using pseudo-holomorphic foliations. First, I will present the basic objects of interest and survey the recent developments in the field (work with H. Gao, and work with E. Zaslow). Then I will delve into new and in-progress results on the Legendrian Contact DGA (work with L. Ng). Finally, I will report on how pseudo-holomorphic curves might help us classify Lagrangian fillings in certain cases. During the course of the talk, I will try to highlight some of the interesting open questions and new methods that arise from our current work as well as future directions.



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