The de Rham quantum global geometric Langlands conjecture

Let GG be a simple reductive group, let Gˇ\check{G} be its Langlands dual group, let hˇ\check{h} be the dual Coxeter number of GG, and let rr be the maximal multiplicity of arrows in the Dynkin diagram of GG. For every ckc\in k, let DModc(BunG)\operatorname{DMod}_c(\operatorname{Bun}_G) denote the derived category of DD-modules twisted by the chˇ2hˇ\frac{c-\check{h}}{2\check{h}}-th power of the determinant line bundle Ldet\mathcal L_{\det} on BunG\operatorname{Bun}_G. The de Rham quantum global geometric Langlands conjecture. There exists a canonical equivalence of derived categories

DModc(BunG)LcDMod1rc(BunGˇ).\operatorname{DMod}_c(\operatorname{Bun}_G)\xrightarrow[\cong]{\mathbb L_c}\operatorname{DMod}_{-\frac{1}{rc}}(\operatorname{Bun}_{\check{G}}).

At the limit co~0c\tilde{o}0, the conjecture is expected to recover the ordinary global geometric Langlands correspondence, while unlike that correspondence it is symmetric in GG and Gˇ\check{G}.

Sources & referencesView supporting material

Primary source

Ekaterina Bogdanova, “Quantum Betti geometric Langlands functor”, arXiv:2606.29585 (2026).

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