Coarsely separation of groups and spaces

Inspired by a classical theorem of topological dimension theory, we prove that every geodesic metric space of asymptotic dimension n containing a bi-infinite geodesic can be coarsely separated by a subset S of asymptotic dimension equal to or smaller than $n-1$.\\ We define asymptotic Cantor manifolds, and we prove that every finitely generated group contains such a manifold. We also state some questions related to them.