Gaitsgory–Lysenko–Drinfeld–Stoyanovsky quantum geometric Langlands conjecture

Let GG be a reductive group, let Gˇ\check{G} be its Langlands dual group, and let κ\kappa be a Kac–Moody level for GG. Denote by κˇ\check{\kappa} the dual level for Gˇ\check{G}, by BunG\operatorname{Bun}_G and BunGˇ\operatorname{Bun}_{\check{G}} the corresponding moduli stacks of bundles, and by DModκ\operatorname{DMod}_{\kappa} the category of twisted DD-modules at level κ\kappa. Gaitsgory–Lysenko–Drinfeld–Stoyanovsky conjecture. Quantum geometric Langlands predicts an equivalence

DModκ(BunG)LκDModκˇ(BunGˇ).\operatorname{DMod}_{\kappa}(\operatorname{Bun}_G) \xrightarrow[\mathbb L_{\kappa}]{\sim} \operatorname{DMod}_{-\check{\kappa}}(\operatorname{Bun}_{\check{G}}).

This is the expected quantum geometric Langlands equivalence. The source gives the prediction without asserting a proof or describing a known range of cases.

Sources & referencesView supporting material

Primary source

Ekaterina Bogdanova, “Non-vanishing of quantum geometric Whittaker coefficients”, arXiv:2508.19058 (2025).

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