Geometric Langlands connected-components conjecture

Let XX be a smooth complete curve over a field kk, let GG be a reductive group, and let \Shv\Nilp(\BunG)\Shv_{\Nilp}(\Bun_G) be the category of ℓ\ell-adic sheaves on \BunG\Bun_G with nilpotent singular support. Let \LS\cG\onrestr\LS^{\on{restr}}_\cG be the prestack of \cG\cG-local systems on XX with restricted variation, and let ′ ⁣\LS\cG\onrestr'\!\LS^{\on{restr}}_\cG be the union of some of its connected components. Geometric Langlands connected-components conjecture. The inclusion

′ ⁣\LS\cG\onrestr⊂\LS\cG\onrestr'\!\LS^{\on{restr}}_\cG\subset \LS^{\on{restr}}_\cG

is always an equality. The main theorem establishes this equality when char⁡(k)=0\operatorname{char}(k)=0 and, for arbitrary kk, when G=GLnG=GL_n; the conjecture asks for the equality in all characteristics and for all relevant groups.

References

Primary source

Dennis Gaitsgory and Sam Raskin, “Geometric Langlands in positive characteristic from characteristic zero”, arXiv:2508.02237 (2025).

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