Actions of lattices in $p$-adic and $S$-arithmetic groups on manifolds
We prove that an action by $C^1$-diffeomorphisms of a lattice in a simple $p$-adic group on a compact manifold is finite, provided that the dimension of the manifold is less than the rank of the group. We extend this statement to lattices in totally disconnected $S$-arithmetic groups, where the critical dimension is the maximal rank of its simple factors. This uses the machinery developed by Brown, Fisher, and Hurtado.
math.DS↗