Penn Arts & Sciences Logo

Geometry-Topology Seminar

Thursday, November 18, 2021 - 5:15pm

Radhika Gupta

Temple University


University of Pennsylvania

via Zoom

The Zoom link will be sent via e-mail to all Penn faculty and students. Otherwise, please just e-mail for the link. After the talk, we will stay for a while for a social visit with one another, with the Zoom recording turned off.

The stretch factor of a pseudo-Anosov homeomorphism equals its homological stretch factor if and only if the associated stable foliation is transversally orientable. In this talk, we will explore the relation between stretch factor and homological stretch factor of automorphisms of free groups along the same lines as for pseudo-Anosov homeomorphism.  This is joint work with Spencer Dowdall and Sam Taylor.