Colored Rasmussen spectral sequence conjecture for the unknot

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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,…,un−1u_0,\ldots,u_{n-1} and odd generators ξ0,…,ξn−1\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=0iujui−j.d_2(u_i)=0,\qquad d_2(\xi_i)=\sum_{j=0}^{i}u_ju_{i-j}.

Consequently,

KhSn(O1)≃H∗(Z[u0,…,un−1,ξ0,…,ξn−1],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.

References

Primary source

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

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