Legendrian ribbons in overtwisted contact structures

Details Legendrian ribbons in overtwisted contact structures Legendrian ribbons in overtwisted contact structures

2007-08-08

arxiv.org/abs/0708.1087v1

Mathematics

Geometric Topology

6 pages, 3 figures

Scientific paper

We show that a null-homologous transverse knot K in the complement of an overtwisted disk in a contact 3-manifold is the boundary of a Legendrian ribbon if and only if it possesses a Seifert surface S such that the self-linking number of K with respect to S satisfies $\sel(K,S)=-\chi(S)$. In particular, every null-homologous topological knot type in an overtwisted contact manifold can be represented by the boundary of a Legendrian ribbon. Finally, we show that a contact structure is tight if and only if every Legendrian ribbon minimizes genus in its relative homology class.

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