The action of mapping classes on nilpotent covers of surfaces

Abstract

Let $\Sigma$ be a surface whose interior admits a hyperbolic structure of finite volume. In this paper, we show that any infinite order mapping class acts with infinite order on the homology of some universal $k$--step nilpotent cover of $\Sigma$. We show that a Torelli mapping class either acts with infinite order on the homology of a finite abelian cover, or the suspension of the mapping class is a 3--manifold whose fundamental group has positive homology gradient. In the latter case, it follows that the suspended 3--manifold has a large fundamental group. It follows that every element of the Magnus kernel suspends to give a 3--manifold with a large fundamental group.

18 pages

References in corpus (2)

• Infinite generation of the kernels of the Magnus and Burau representations
• Large groups, Property (tau) and the homology growth of subgroups

Cited by in corpus (1)

• Teichmüller polynomials, Alexander polynomials and finite covers of surfaces