## Abstracts of Workshops

### Benson Farb, University of Chicago

### Rigidity Theorems for Lattices in Lie Groups

In this talk I will give a broad overview of rigidity theorems for lattices in Lie groups.

### Seonhee Lim, Cornell University

### Mostow Rigidity and Beyond

We will introduce Mostow rigidity and outline its proof. We will also explain how the idea can be generalized to quasi-isometry rigidity as well as volume entropy rigidity. Volume entropy rigidity for rank-1 Riemannian manifolds is known: a theorem of Besson-Courtois-Gallot says that the locally symmetric metrics attain minimal volume entropy among all Riemannian metrics. We will give a brief outline of their proof.