English

Genus bounds bridge number for high distance knots

Geometric Topology 2012-11-21 v1

Abstract

If a knot K in a closed, orientable 3-manifold M has a bridge surface T with distance at least 3 in the curve complex of T - K, then the genus of any essential surface in its exterior with non-empty, non-meridional boundary gives rise to an upper bound for the bridge number of K with respect to T. In particular, a nontrivial, aspherical, and atoroidal knot K with such a bridge surface has its bridge number bounded by 5 if K has a non-trivial reducing surgery; 6 if K has a non-trivial toroidal surgery; and 4g + 2 if K is null-homologous and has Seifert genus g.

Keywords

Cite

@article{arxiv.1211.4787,
  title  = {Genus bounds bridge number for high distance knots},
  author = {Ryan Blair and Marion Campisi and Jesse Johnson and Scott A. Taylor and Maggy Tomova},
  journal= {arXiv preprint arXiv:1211.4787},
  year   = {2012}
}

Comments

9 pages