Local trace conjecture for restricted loop-group categories

Let GG be a reductive group and let \fL(G)Catrestr\fL(G)\operatorname{Cat}_{\operatorname{restr}} be the restricted 2-category of categories acted on by its loop group. Let Frob\operatorname{Frob} denote Frobenius, and let TrDGCat(Frob,\fL(G)Catrestr)\operatorname{Tr}_{\operatorname{DGCat}}(\operatorname{Frob},\fL(G)\operatorname{Cat}_{\operatorname{restr}}) be the corresponding categorical trace. Local trace conjecture. The natural map

emb.restr(TrDGCat(Frob,\fL(G)Catrestr))TrAGCat(Frob,\fL(G))\operatorname{emb.restr}\bigl(\operatorname{Tr}_{\operatorname{DGCat}}(\operatorname{Frob},\fL(G)\operatorname{Cat}_{\operatorname{restr}})\bigr)\to \operatorname{Tr}_{\operatorname{AGCat}}(\operatorname{Frob},\fL(G))

is an isomorphism. This conjecture compares the restricted and unrestricted local trace constructions; 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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