Examples of cubulable groups with fixed-point properties

Abstract: For every $n \geq 1$, let $(\mathrm{FW}n)$ denote the fixed-point property for median graphs of cubical dimension $n$ (or equivalently, for CAT(0) cube complexes of dimension $n$). In this article, we construct groups satisfying $(\mathrm{FW}_n)$ but not $(\mathrm{FW}{n+1})$. Our examples are virtually free abelian and virtually graph products of finite groups. As an application of our constructions, we obtain, for every $n \geq 1$, a group satisfying $(\mathrm{FW}_n)$ but acting properly and cocompactly on a median graph of cubical dimension $n+1$. Several conjectures and open questions are included.