English

The genus 1 bridge number of satellite knots

Geometric Topology 2025-07-18 v2

Abstract

Let TT be a satellite knot, link, or spatial graph in a 3-manifold MM that is either S3S^3 or a lens space. Let b0\mathfrak{b}_0 and b1\mathfrak{b}_1 denote genus 0 and genus 1 bridge number, respectively. Suppose that TT has a companion knot KK (necessarily not the unknot) and wrapping number ω\omega with respect to KK. When KK is not a torus knot, we show that b1(T)ωb1(K)\mathfrak{b}_1(T)\geq \omega \mathfrak{b}_1(K). There are previously known counter-examples if KK is a torus knot. Along the way, we generalize and give a new proof of Schubert's result that b0(T)ωb0(K)\mathfrak{b}_0(T) \geq \omega \mathfrak{b}_0(K). We also prove versions of the theorem applicable to when TT is a ``lensed satellite'' and when there is a torus separating components of TT.

Keywords

Cite

@article{arxiv.2401.01834,
  title  = {The genus 1 bridge number of satellite knots},
  author = {Scott A. Taylor and Maggy Tomova},
  journal= {arXiv preprint arXiv:2401.01834},
  year   = {2025}
}

Comments

Accepted by Journal of the London Mathematical Society