On knot Floer width and Turaev genus

Details On knot Floer width and Turaev genus On knot Floer width and Turaev genus

2007-09-05

arxiv.org/abs/0709.0720v1

Algebr. Geom. Topol. 8 (2008), no. 2, 1141--1162.

Mathematics

Geometric Topology

15 pages, 15 figures

Scientific paper

To each knot $K\subset S^3$ one can associated its knot Floer homology $\hat{HFK}(K)$, a finitely generated bigraded abelian group. In general, the nonzero ranks of these homology groups lie on a finite number of slope one lines with respect to the bigrading. The width of the homology is, in essence, the largest horizontal distance between two such lines. Also, for each diagram $D$ of $K$ there is an associated Turaev surface, and the Turaev genus is the minimum genus of all Turaev surfaces for $K$. We show that the width of knot Floer homology is bounded by Turaev genus plus one. Skein relations for genus of the Turaev surface and width of a complex that generates knot Floer homology are given.

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