Ramified trace conjecture for enhanced automorphic sheaves

Let XX be a smooth complete curve, let GG be reductive, let \ulx\ul{x} be a finite set of points, and let IsocG\operatorname{Isoc}_G be the stack of GG-isocrystals. Let Autom(X,G)enh\ulx\operatorname{Autom}(X,G)^{\operatorname{enh}_{\ul{x}}} be the enhanced automorphic object, and let cl(\ulShvHL(BunGlevel\ulx),Frob)\operatorname{cl}(\ul{\operatorname{Shv}}_{\operatorname{HL}}(\operatorname{Bun}_G^{\operatorname{level}_{\ul{x}}}),\operatorname{Frob}) be the Frobenius class of the Hecke-lisse object. Ramified trace conjecture. There exists a canonical isomorphism in Shv(IsocG)\operatorname{Shv}(\operatorname{Isoc}_G):

Autom(X,G)enh\ulxcl(\ulShvHL(BunGlevel\ulx),Frob).\operatorname{Autom}(X,G)^{\operatorname{enh}_{\ul{x}}}\simeq \operatorname{cl}(\ul{\operatorname{Shv}}_{\operatorname{HL}}(\operatorname{Bun}_G^{\operatorname{level}_{\ul{x}}}),\operatorname{Frob}).

This generalizes the unramified trace comparison to the ramified setting; the source gives no resolution evidence.

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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