Geometry and Topology Seminar
Friday, May 6, 2016
3:00pm to 5:00pmAdd to Cal
Unsmoothable group actions on one-manifolds
Thomas Koberda, Mathematics, Univeristy of Virginia,
|I will discuss virtual mapping class group actions on compact one-manifolds. The main result will be that there exists no faithful C2 action of a finite index subgroup of the mapping class group on the circle, which generalizes results of Farb-Franks and establishes a higher rank phenomenon for the mapping class group, mirroring a result of Ghys and Burger-Monod.