Colored Rasmussen spectral sequence conjecture for the unknot

Let HHHSn(O1)\mathrm{HHH}_{S^n}(O_1) be the SnS^n-colored triply graded Khovanov–Rozansky homology of the unknot, with even generators u0,,un1u_0,\ldots,u_{n-1} and odd generators ξ0,,ξn1\xi_0,\ldots,\xi_{n-1}. Let KhSn(O1)\mathrm{Kh}_{S^n}(O_1) denote the SnS^n-colored Khovanov homology. Colored Rasmussen spectral sequence conjecture. The Rasmussen spectral sequence from HHHSn(O1)\mathrm{HHH}_{S^n}(O_1) to KhSn(O1)\mathrm{Kh}_{S^n}(O_1) has only one nontrivial differential d2d_2, given by

d2(ui)=0,d2(ξi)=j=0iujuij.d_2(u_i)=0,\qquad d_2(\xi_i)=\sum_{j=0}^{i}u_ju_{i-j}.

Consequently,

KhSn(O1)H(Z[u0,,un1,ξ0,,ξn1],d2).\mathrm{Kh}_{S^n}(O_1)\simeq H^*\left(\mathbb{Z}[u_0,\ldots,u_{n-1},\xi_0,\ldots,\xi_{n-1}],d_2\right).

This is proposed as the colored extension of Rasmussen's spectral sequence, identifying colored Khovanov homology of the unknot with the cohomology of the stated differential graded algebra.

Sources & referencesView supporting material

Primary source

Akram Alishahi, Eugene Gorsky and Beibei Liu, “Colored knot Floer homology: structures and examples”, arXiv:2508.21776 (2025).

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