Gaitsgory–Lurie spherical Whittaker–affine Lie algebra equivalence conjecture

Let GG be a reductive group, let Gˇ\check{G} be its Langlands dual group, and let κ\kappa be a nondegenerate level for GG with dual level κˇ\check{\kappa} for Gˇ\check{G}. Write GrG=LG/L+G\operatorname{Gr}_G=\mathfrak{L}G/\mathfrak{L}^+G for the affine Grassmannian, and let Whitκsph\mathsf{Whit}_{\kappa}^{\operatorname{sph}} be the DG category of κ\kappa-twisted Whittaker DD-modules on GrG\operatorname{Gr}_G. Let gˇ^κˇ\widehat{\check{\mathfrak{g}}}_{\check{\kappa}} be the affine Lie algebra associated to Gˇ\check{G} and κˇ\check{\kappa}, and let gˇ^κˇmodL+Gˇ\widehat{\check{\mathfrak{g}}}_{\check{\kappa}}\text{\textendash}\mathsf{mod}^{\mathfrak{L}^+\check{G}} denote the DG category of Harish–Chandra modules for (gˇ^κˇ,L+Gˇ)(\widehat{\check{\mathfrak{g}}}_{\check{\kappa}},\mathfrak{L}^+\check{G}). Gaitsgory–Lurie conjecture. There is an equivalence of DG categories

Whitκsphgˇ^κˇmodL+Gˇ.\mathsf{Whit}_{\kappa}^{\operatorname{sph}}\simeq \widehat{\check{\mathfrak{g}}}_{\check{\kappa}}\text{\textendash}\mathsf{mod}^{\mathfrak{L}^+\check{G}}.

This is a spherical form of the local quantum geometric Langlands conjecture, relating twisted Whittaker sheaves on the affine Grassmannian to Harish–Chandra modules for the dual affine Lie algebra. The supplied text does not state whether the conjecture is known or remains open.

Sources & referencesView supporting material

Primary source

Justin Campbell, Gurbir Dhillon and Sam Raskin, “Fundamental local equivalences in quantum geometric Langlands”, arXiv:1907.03204 (2020).

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