Ramified global geometric Langlands correspondence

From papers

Let \oX=X\ulx\oX=X-\ul{x}, let LScGrestr(\oX)\operatorname{LS}^{\operatorname{restr}}_{cG}(\oX) and LScGrestr(\ocD\ulx)\operatorname{LS}^{\operatorname{restr}}_{cG}(\ocD_{\ul{x}}) be the restricted moduli stacks of local systems on the punctured curve and formal punctured discs, respectively, and let fr\operatorname{fr} be restriction from the former to the latter. Let IndCoh\Nilp(LScGrestr(\oX)LScGrestr(\ocD\ulx))\operatorname{IndCoh}_\Nilp(\operatorname{LS}^{\operatorname{restr}}_{cG}(\oX)\mid\operatorname{LS}^{\operatorname{restr}}_{cG}(\ocD_{\ul{x}})) be the corresponding relative ind-coherent object. Ramified global geometric Langlands conjecture. Under the conjectural local equivalence

\fL(G)\ulxCatrestrtIndCoh\Nilp(LScGrestr(\ocD\ulx)),\fL(G)_{\ul{x}}\operatorname{Cat}_{\operatorname{restr}}\simeq \operatorname{tIndCoh}_\Nilp(\operatorname{LS}^{\operatorname{restr}}_{cG}(\ocD_{\ul{x}})),

the object \ulShvHL(BunGlevel\ulx)\ul{\operatorname{Shv}}_{\operatorname{HL}}(\operatorname{Bun}_G^{\operatorname{level}_{\ul{x}}}) corresponds to

IndCoh\Nilp(LScGrestr(\oX)LScGrestr(\ocD\ulx)).\operatorname{IndCoh}_\Nilp(\operatorname{LS}^{\operatorname{restr}}_{cG}(\oX)\mid\operatorname{LS}^{\operatorname{restr}}_{cG}(\ocD_{\ul{x}})).

This is the spectral description of the Hecke-lisse automorphic object in the ramified setting; it remains conditional on the local equivalence and the restrictedness conjecture.

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Sources & referencesView supporting material

Primary source

Dennis Gaitsgory, “Local and global Langlands conjecture(s) over function fields”, arXiv:2509.24902 (2025).

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