English

Moving homology classes in finite covers of graphs

Geometric Topology 2015-10-01 v1 Group Theory

Abstract

Let YXY\to X be a finite normal cover of a wedge of n3n\geq 3 circles. We prove that for any v0H1(Y;Q)v\neq 0\in H_1(Y;\mathbb{Q}) there exists a lift F~\widetilde{F} to YY of a homotopy equivalence F:XXF:X\to X so that the set of iterates {F~d(v):dZ}H1(Y;Q)\{\widetilde{F}^d(v): d\in \mathbb{Z}\}\subseteq H_1(Y;\mathbb{Q}) is infinite. The main achievement of this paper is the use of representation theory to prove the existence of a purely topological object that seems to be inaccessible via topology.

Keywords

Cite

@article{arxiv.1509.09253,
  title  = {Moving homology classes in finite covers of graphs},
  author = {Benson Farb and Sebastian Hensel},
  journal= {arXiv preprint arXiv:1509.09253},
  year   = {2015}
}

Comments

8 pages; 1 figure