Uniformly Almost Flatness and Solubility in Finitely Generated Groups

Abstract

Tointon and the author conjectured that, for a finitely generated residually finite group, virtual nilpotence is equivalent to the condition that the diameters of its finite coset spaces admit a uniform polynomial lower bound in terms of their sizes. We first verify this conjecture for the class of finitely generated soluble groups. We then prove that this polynomial lower bound condition implies that the group has a finite-index subgroup whose finite quotients are all soluble. An immediate consequence of these two results is the verification of the conjecture for finitely generated linear groups. In addition, we establish the same conclusion for certain finitely generated abelian-by-cyclic groups under the weaker assumption that their finite quotients satisfy this polynomial lower bound condition.