Proper Actions on Homogeneous Spaces of the Upper Triangular Matrix Group via Coarse Geometry

Abstract: We study proper actions on homogeneous spaces of the group $\mathrm{B}(n)$ of invertible upper triangular matrices from a coarse-geometric viewpoint. We obtain sufficient conditions for the properness of the natural $L$-action on $\mathrm{B}(n)/H$, where $L,H$ are closed subgroups of $\mathrm{B}(n)$. We also give an explicit sufficient condition for properness of the $L$-action on a homogeneous space naturally identified with $\mathrm{B}(n)/H\cong \mathbb{R}<sup>{n-1}$. In addition, we discuss extensions to the case where the ambient group $G$ is a subgroup of $\mathrm{B}(n)$ and $L,H$ are closed subgroups of $G$, with particular attention to the unipotent subgroup $\mathrm{N}(n)$.