English

On Steenrod squares for even and odd Khovanov homology

Geometric Topology 2026-05-29 v2 Algebraic Topology

Abstract

For an arbitrary link LS3L \subset S^3 , Sarkar-Scaduto-Stoffregen construct a family of spatial refinements of even and odd Khovanov homology. We give a computation of Sq2\text{Sq}^2 on these spaces, determining their stable homotopy types for all knots K up to 11 crossings. We also prove that the Steenrod squares Sq02\text{Sq}_0^2 , Sq12\text{Sq}_1^2 defined by Sch\"utz do arise as Steenrod squares on these spaces.

Keywords

Cite

@article{arxiv.2509.03396,
  title  = {On Steenrod squares for even and odd Khovanov homology},
  author = {Advika Rajapakse},
  journal= {arXiv preprint arXiv:2509.03396},
  year   = {2026}
}

Comments

Typos corrected and identification with formula of Sch\"utz corrected. Added information about Conway mutation. 87 pages