Geometry/Physics Seminar

Title: Dehn twists and free subgroups of the symplectic mapping class group
Speaker: Ailsa Keating
Speaker Info: MIT
Brief Description:
Special Note:

Given two Lagrangian spheres in an exact symplectic manifold, we present conditions under which the Dehn twists about them generate a free non-abelian subgroup of the symplectic mapping class group. This extends a result of Ishida for Riemann surfaces. The proof generalises the categorical version of Seidel’s long exact sequence to arbitrary powers of a fixed Dehn twist. Time allowing, we construct families of examples containing such spheres.
Date: Tuesday, February 19, 2013
Time: 4:00pm
Where: Lunt 107
Contact Person: Michael Couch
Contact email: mcouch@math.northwestern.edu
Contact Phone:
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