Masterclass: Expanders and rigidity of group actions
The purpose of this PhD Masterclass is to give an introduction to the theory of expander graphs, and present some of their recent applications to important problems in geometric (and analytic) group theory, and to operator algebras. In particular, we will address connections to rigidity properties (such as property (T) and fixed point properties) of group actions on Banach spaces. The masterclass is aimed primariy at junior researchers, such as PhD students and postdocs.