Positive torus links T(m,n) and Sym^l-colored torus knots have triply graded Khovanov-Rozansky homology equal to an explicitly defined family of polynomials p(v,w).
Hilbert schemes and $y$-ification of Khovanov-Rozansky homology
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abstract
We define a deformation of the triply graded Khovanov-Rozansky homology of a link $L$ depending on a choice of parameters $y_c$ for each component of $L$, which satisfies link-splitting properties similar to the Batson-Seed invariant. Keeping the $y_c$ as formal variables yields a link homology valued in triply graded modules over $\mathbb{Q}[x_c,y_c]_{c\in \pi_0(L)}$. We conjecture that this invariant restores the missing $Q\leftrightarrow TQ^{-1}$ symmetry of the triply graded Khovanov-Rozansky homology, and in addition satisfies a number of predictions coming from a conjectural connection with Hilbert schemes of points in the plane. We compute this invariant for all positive powers of the full twist and match it to the family of ideals appearing in Haiman's description of the isospectral Hilbert scheme.
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Torus link homology
Positive torus links T(m,n) and Sym^l-colored torus knots have triply graded Khovanov-Rozansky homology equal to an explicitly defined family of polynomials p(v,w).