Gunningham's conjecture relating instanton Floer homology and generic skein modules

Let GG be a reductive group and MM a closed, connected, oriented 33-manifold. Let \LocG\ff(M)\Loc^{\ff}_{G}(M) be the representation variety of GG-local systems, let φG#(M)\varphi^{\#}_{G}(M) be the pullback of the Donaldson–Thomas sheaf to this representation variety, and let SkGgen(M)\operatorname{Sk}^{\operatorname{gen}}_{G}(M) be the skein module with generic quantum parameters associated to MM. Gunningham's conjecture. There is an isomorphism

\HH0(\LocG\ff(M),φG#(M))CC(q1/d)=SkGgen(M).\HH^{0}(\Loc^{\ff}_{G}(M),\varphi^{\#}_{G}(M)) \otimes_{\mathbb{C}} \mathbb{C}(q^{1/d}) = \operatorname{Sk}^{\operatorname{gen}}_{G}(M).

The conjecture identifies the generic skein module with a scalar extension of the degree-zero cohomology of the framed complexified instanton Floer theory. It is cited in the source as Conjecture D of Gunningham's work.

Sources & referencesView supporting material

Primary source

Sarunas Kaubrys, “Cohomological Donaldson-Thomas theory for local systems on the 3-torus”, arXiv:2409.16013 (2024).

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