Relative Khovanov-Jacobsson classes

Isaac Sundberg; Jonah Swann

doi:10.2140/agt.2022.22.3983

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arXiv · 2103.01438

Relative Khovanov-Jacobsson classes

Isaac Sundberg·Jonah Swann

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Abstract

To a smooth, compact, oriented, properly-embedded surface in the $4$-ball, we define an invariant of its boundary-preserving isotopy class from the Khovanov homology of its boundary link. Previous work showed that when the boundary link is empty, this invariant is determined by the genus of the surface. We show that this relative invariant: can obstruct sliceness of knots; detects a pair of slices for $9_{46}$; is not hindered by detecting connected sums with knotted $2$-spheres.

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Isaac Sundberg, Jonah Swann. 2021-03-02. Relative Khovanov-Jacobsson classes. https://doi.org/10.2140/agt.2022.22.3983

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