The automorphic Galois group conjecture for global Langlands correspondences

From papers

Let FF be a number field and let LFL_F be the conjectural automorphic Galois group, with localizations compatible with the local Langlands correspondence. Write Πcusp,temp(GL(N))\Pi_{\mathrm{cusp,temp}}(\operatorname{GL}(N)) for cuspidal tempered automorphic representations of GL(N)\operatorname{GL}(N), and let Πaut,temp(G)\Pi_{\mathrm{aut,temp}}(G) denote tempered automorphic representations of a quasisplit group GG over FF.

Automorphic Galois group conjecture.

(a) There is a bijection

{r:LFGL(N,C)}{πΠcusp,temp(GL(N))},\{r:L_F\longrightarrow\operatorname{GL}(N,\mathbb{C})\}\xrightarrow{\sim}\{\pi\in\Pi_{\mathrm{cusp,temp}}(\operatorname{GL}(N))\},

from equivalence classes of bounded, irreducible, NN-dimensional representations of LFL_F to cuspidal tempered automorphic representations of GL(N)\operatorname{GL}(N), compatible with the local Langlands correspondence at each vv.

(b) For any quasisplit group GG over FF, there is a bijection

{ϕ:LFLG}{ΠϕΠaut,temp(G)},\{\phi:L_F\longrightarrow{}^LG\}\xrightarrow{\sim}\{\Pi_\phi\subset\Pi_{\mathrm{aut,temp}}(G)\},

from equivalence classes of bounded global parameters Φbdd(G)\Phi_{\mathrm{bdd}}(G) to disjoint global packets, whose union contains the set Φaut,temp(G)\Phi_{\mathrm{aut,temp}}(G) of tempered automorphic representations of G(A)G(\mathbb{A}), compatible with the local Langlands correspondence at each vv.

The conjecture proposes that LFL_F simultaneously parameterizes cuspidal tempered representations of general linear groups and tempered global packets for all quasisplit groups. The supplied text does not state which cases are known or the conjecture's current status.

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Sources & referencesView supporting material

Primary source

James Arthur, “Motives and Automorphic Representations”, arXiv:2507.10268 (2025).

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