Safronov's root-of-unity skein conjecture

Let MM be a closed 3-manifold, let qq be a good root of unity, and let GG^\vee be the metaplectic dual group. Let LocG(M)\mathrm{Loc}_{G^\vee}(M) be the character stack of GG^\vee-local systems on MM.

Safronov's root-of-unity skein conjecture. There is a line bundle Lq\mathcal{L}_q on LocG(M)\mathrm{Loc}_{G^\vee}(M) such that

SkG,q(M)H0(LocG(M),Lq).\mathrm{Sk}_{G,q}(M)\cong \mathrm{H}^0(\mathrm{Loc}_{G^\vee}(M),\mathcal{L}_q).

This is a root-of-unity analogue of the generic skein–DT sheaf comparison. The source attributes the conjecture to Pavel Safronov and gives no resolution.

Sources & referencesView supporting material

Primary source

Chun-Yu Bai, “Derived skein module”, arXiv:2606.11122 (2026).

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