A refinement of Rasmussen's s-invariant
Geometric Topology
2014-05-08 v2 Algebraic Topology
Abstract
In a previous paper we constructed a spectrum-level refinement of Khovanov homology. This refinement induces stable cohomology operations on Khovanov homology. In this paper we show that these cohomology operations commute with cobordism maps on Khovanov homology. As a consequence we obtain a refinement of Rasmussen's slice genus bound s for each stable cohomology operation. We show that in the case of the Steenrod square Sq^2 our refinement is strictly stronger than s.
Cite
@article{arxiv.1206.3532,
title = {A refinement of Rasmussen's s-invariant},
author = {Robert Lipshitz and Sucharit Sarkar},
journal= {arXiv preprint arXiv:1206.3532},
year = {2014}
}
Comments
26 pages, 2 figures