The local Langlands correspondence for disconnected reductive groups

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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.

References

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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