English

$\mathbb{Z}/p^r$-hyperbolicity via homology

Algebraic Topology 2021-07-28 v2

Abstract

We show that the homotopy groups of a Moore space Pn(pr)P^n(p^r), where pr2p^r \neq 2, are Z/ps\mathbb{Z}/p^s-hyperbolic for srs \leq r. Combined with work of Huang-Wu, Neisendorfer, and Theriault, this completely resolves the question of when such a Moore space is Z/ps\mathbb{Z}/p^s-hyperbolic for p5p \geq 5, or when p=2p=2 and r6r \geq 6. We also give a criterion in ordinary homology for a space to be Z/pr\mathbb{Z}/p^r-hyperbolic, and deduce some examples.

Keywords

Cite

@article{arxiv.2106.03516,
  title  = {$\mathbb{Z}/p^r$-hyperbolicity via homology},
  author = {Guy Boyde},
  journal= {arXiv preprint arXiv:2106.03516},
  year   = {2021}
}

Comments

31 pages. Comments welcome! v2: minor tweaks to include the case p^s=2 and its consequences (originally due to Zhu-Pan), edits to introduction

R2 v1 2026-06-24T02:54:24.359Z