Dehn twist and monodromy in local mirror symmetry

主讲人 Speaker:Prof. Chien-Hsun Wang (Taiwan Normal University)
时间 Time:2022/06/07 Tue. 3:00-4:30pm (Beijing time)
地点 Venue:Zoom Meeting ID: 984 962 1397 (no password needed)


Seidel in his paper [1] shows that the monodromy around a critical point of a Lefschetz fibration of an exact symplectic manifold is isotopic to the Dehn twist along a Lagrangian sphere. We follow his approach [2] to study the Dehn twist operation on Lagrangian submanifolds in the suspension of a symplectic manifold X and show that the Dehn twist on X is compatible with that on the suspension of X. Combined with [3], the categorical Dehn twist on the Fukaya category is compatible with local mirror symmetry and the mutation operation of sheaves of its mirror.


[1] P. Seidel, Long exact sequence of symplectic Floer homology

[2] P. Seidel, Fukaya categories and Picard Lefschetz theory

[3] T. Bridgeland, T-structures on some local Calabi-Yau varieties