Lisa Carbone Rutgers University Group actions on buildings, lattices and Kac-Moody groups Friday 1st August, 12:05-12:55pm, Carslaw 175. We will discuss a group associated to a Kac-Moody Lie algebra over a finite field, as constructed by Tits and Carbone-Garland. Such a group is locally compact and totally disconnected and admits an action on its Bruhat-Tits building, which in rank 2 is a homogeneous tree. We also discuss the existence of lattice subgroups in the Kac-Moody group.