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 \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.

Sources & referencesView supporting material

Primary source

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

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