The local Langlands correspondence for disconnected reductive groups

From papers

Let GG be a connected, quasi-split reductive group over FF, let (G,ξ,z)(G',\xi,z) be a rigid inner twist of GG, and let Φe(G;[z])\Phi_\mathrm{e}(G;[z]) denote the set of G^\widehat{G}-conjugacy classes of [z][z]-relevant enhanced L-parameters. Here Irr(G(F))\operatorname{Irr}(G'(F)) is the set of irreducible representations of G(F)G'(F). The local Langlands correspondence. There exists a bijection

LLC(G,ξ,z) ⁣:Irr(G(F))Φe(G;[z]);π[ϕπ,ρ(z,π)]\operatorname{LLC}_{(G',\xi,z)}\colon \operatorname{Irr}(G'(F))\to \Phi_\mathrm{e}(G;[z]);\quad \pi\mapsto [\phi_\pi,\rho_{(z,\pi)}]

and it satisfies a lot of properties. The statement proposes a local Langlands parametrization for irreducible representations of rigid inner forms by relevant enhanced L-parameters; the parser supplies no evidence resolving it, so its status remains open.

Progress summary

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Sources & referencesView supporting material

Primary source

Amoru Fujii, “The local Langlands correspondence of essentially unipotent supercuspidal representations for disconnected reductive groups”, arXiv:2604.25198 (2026).

Additional references

6 papers in this index state this conjecture (2015–2026). The statement above is taken from the most recent of them; the others are arXiv:2504.17225, arXiv:2301.12143, arXiv:2210.02519, arXiv:1903.11285, arXiv:1507.01042.

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