On the anti-diagonal filtration for the Heegard Floer chain complex of a branched double-cover

Abstract

Seidel and Smith introduced the graded fixed-point symplectic Khovanov cohomology group $Kh_{\rm symp,~inv}(K)$ for a knot $K \subset S^{3}$, as well as a spectral sequence converging to the Heegaard Floer homology group $\widehat{HF}(\Sigma (K) \# (S^2 \times S^1))$ with $E^1$-page isomorphic to a factor of $Kh_{\rm symp,~inv}(K)$. There the authors proved that $Kh_{\rm symp,~inv}$ is a knot invariant. We show here that the higher pages of their spectral sequence are knot invariants also.