English

Complete topological descriptions of certain Morse boundaries

Geometric Topology 2020-09-21 v2 Group Theory

Abstract

We study direct limits of embedded Cantor sets and embedded \sier curves. We show that under appropriate conditions on the embeddings, all limits of Cantor spaces give rise to homeomorphic spaces, called ω\omega-Cantor spaces, and similarly, all limits of \sier curves give homeomorphic spaces, called to ω\omega-\sier curves. We then show that the former occur naturally as Morse boundaries of right-angled Artin groups and fundamental groups of non-geometric graph manifolds, while the latter occur as Morse boundaries of fundamental groups of finite-volume, cusped hyperbolic 3-manifolds.

Keywords

Cite

@article{arxiv.1908.03542,
  title  = {Complete topological descriptions of certain Morse boundaries},
  author = {Ruth Charney and Matthew Cordes and Alessandro Sisto},
  journal= {arXiv preprint arXiv:1908.03542},
  year   = {2020}
}

Comments

24 pages, 1 figure; added theorem that certain graph of group decompositions have $\omega$-Cantor space boundary, including fundamental groups of non-geometric graph manifolds

R2 v1 2026-06-23T10:43:57.080Z