Gorsky–Negut–Rasmussen conjecture for sheaves on Hilbert schemes

Let β\beta be a braid on nn strands. Let Hilbn(C2,C)\operatorname{Hilb}^n(\mathbb{C}^2,\mathbb{C}) be the indicated Hilbert scheme, let T\mathcal{T} be its tautological rank-nn bundle, and let Fβ\mathcal{F}_{\beta} be a C×C\mathbb{C}^*\times\mathbb{C}^*-equivariant coherent sheaf. Gorsky–Negut–Rasmussen conjecture. The sheaf Fβ\mathcal{F}_{\beta} has properties (a)–(e):

(a) HHH(β)HC×C(Hilbn(C2,C),FβT)\operatorname{HHH}(\beta)\simeq H^*_{\mathbb{C}^*\times\mathbb{C}^*}\left(\operatorname{Hilb}^n(\mathbb{C}^2,\mathbb{C}),\mathcal{F}_{\beta}\otimes\wedge^{\bullet}\mathcal{T}^{\vee}\right) as triply graded vector spaces, with the stated grading correspondence;

(b) the action of symmetric functions in xix_i corresponds to the action of C[x1,,xn]Sn\mathbb{C}[x_1,\ldots,x_n]^{S_n} on the right;

(c) for a braid whose closure is a knot, all xix_i act identically and Fβ\mathcal{F}_{\beta} is supported on Hilbn(C2,0)×C\operatorname{Hilb}^n(\mathbb{C}^2,0)\times\mathbb{C};

(d) adding FT=(σ1σn1)n\mathrm{FT}=(\sigma_1\cdots\sigma_{n-1})^n corresponds to tensoring Fβ\mathcal{F}_{\beta} by O(1)\mathcal{O}(1);

(e) Fβ\mathcal{F}_{\beta} extends to a sheaf on the whole Hilbn(C2)\operatorname{Hilb}^n(\mathbb{C}^2) corresponding to yy-ified homology. The conjecture was mostly proved in a series of papers by Oblomkov and Rozansky, so its database status is solved.

Sources & referencesView supporting material

Primary source

Eugene Gorsky, Oscar Kivinen and José Simental, “Algebra and geometry of link homology”, arXiv:2108.10356 (2021).

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