Polynomial-growth conjecture for Khovanov homology of torus links

Fix an integer m2m\geq 2, a field F\mathbb F, and let T(m,n)T(m,n) be the mm-strand torus link. Write Khodd/evenk,l(T(m,n);F)\operatorname{Kh}_{\text{odd/even}}^{k,l}(T(m,n);\mathbb F) for its odd or even Khovanov homology in bidegree (k,l)(k,l).

Polynomial-growth conjecture. The total dimension satisfies

dimF(k,lZKhodd/evenk,l(T(m,n);F))O(nm2).\dim_{\mathbb F}\left(\bigoplus_{k,l\in\mathbb Z}\operatorname{Kh}_{\text{odd/even}}^{k,l}(T(m,n);\mathbb F)\right)\leq O\left(n^{\left\lfloor\frac m2\right\rfloor}\right).

The paper obtains quadratic bounds in the 4-strand case, motivating the predicted degree m/2\lfloor m/2\rfloor for fixed strand number. Establishing this growth rate for all m2m\geq2 remains open in the supplied text.

Sources & referencesView supporting material

Primary source

Tuomas Kelomäki, “Morse matchings and Khovanov homology of 4-strand torus links”, arXiv:2507.15060 (2025).

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