English

Nearly fibered links with genus one

Geometric Topology 2023-10-16 v2

Abstract

We classify all the nn-component links in the 33-sphere that bound a Thurston norm minimizing Seifert surface Σ\Sigma with Euler characteristic χ(Σ)=n2\chi(\Sigma)=n-2 and that are nearly fibered, which means that their rank of the maximal (collapsed) Alexander grading stops_{\text{top}} of the link Floer homology group HFL^\widehat{HFL} is equal to two. In other words, such a link LL satisfies stop=nχ(Σ)2=1s_{\text{top}}=\frac{n-\chi(\Sigma)}{2}=1, and in addition rkHFL^(L)[1]=2\text{rk}\:\widehat{HFL}_{*}(L)[1]=2 and rkHFL^(L)[s]=0\text{rk}\:\widehat{HFL}_{*}(L)[s]=0 for every s>1s>1. The proof of the main theorem is inspired by the one of a similar recent result for knots by Baldwin and Sivek; and involves techniques from sutured Floer homology. Furthermore, we also compute the group HFL^\widehat{HFL} for each of these links.

Keywords

Cite

@article{arxiv.2302.12365,
  title  = {Nearly fibered links with genus one},
  author = {Alberto Cavallo and Irena Matkovič},
  journal= {arXiv preprint arXiv:2302.12365},
  year   = {2023}
}