English

On rank two Kleinian groups with three parabolics

Group Theory 2026-07-08 v1 Geometric Topology

Abstract

The free group of rank 22 is the fundamental group of the genus 22 handlebody H\mathcal{H}. We study discrete representations of this group into PSL(2,C) \mathsf{PSL}(2,\mathbb{C}) so that three disjoint simple closed curves on the conformal boundary H\partial_\infty \mathcal{H} are sent to parabolic elements. We show that the only infinite covolume groups of this form are maximal cusp groups on the boundary of genus 22 Schottky space. We also exhibit hitherto unexpected finite covolume groups which do not arise from Heegaard splitting presentations of tunnel number 11 links.

Cite

@article{arxiv.2607.07424,
  title  = {On rank two Kleinian groups with three parabolics},
  author = {Alex Elzenaar},
  journal= {arXiv preprint arXiv:2607.07424},
  year   = {2026}
}

Comments

14 pages, 10 figures. Key words: two-bridge links, Kleinian groups, Heegaard splittings, tunnel number one links, maximal cusp groups, identification of matrix groups. Correspondence welcome