Stable deformed ${\mathfrak{gl}}_N$ homology of torus knots

Abstract

We compute the $E_2$ page in the Rasmussen spectral sequence from triply graded to ${\mathfrak{gl}}_N$ Khovanov--Rozansky stable homology of torus knots. This confirms a weak form of the conjecture of the second author, Oblomkov, and Rasmussen. The main tool is the link-splitting deformation, or $y$-ification, of link homology; in the $y$-ified context, the relevant Rasmussen spectral sequence collapses and we explicitly compute the $y$-ified ${\mathfrak{gl}}_N$ stable Khovanov--Rozansky homology of torus knots for all $N$.

38 pages