Independence of volume and genus $g$ bridge numbers
Abstract
A theorem of Jorgensen and Thurston implies that the volume of a hyperbolic 3-manifold is bounded below by a linear function of its Heegaard genus. Heegaard surfaces and bridge surfaces often exhibit similar topological behavior; thus it is natural to extend this comparison to ask whether a -bridge surface for a knot in carries any geometric information related to the knot exterior. In this paper, we show that (unlike in the case of Heegaard splittings) hyperbolic volume and genus bridge numbers are completely independent. That is, for any , we construct explicit sequences of knots with bounded volume and unbounded genus bridge number, and explicit sequences of knots with bounded genus bridge number and unbounded volume.
Keywords
Cite
@article{arxiv.1512.03869,
title = {Independence of volume and genus $g$ bridge numbers},
author = {Jessica S. Purcell and Alexander Zupan},
journal= {arXiv preprint arXiv:1512.03869},
year = {2016}
}
Comments
14 pages, 5 figures