Functoriality conjecture for the local Langlands correspondence under automorphisms

Let AA act on the rigid inner twists of a connected reductive group GG, on tempered refined Langlands parameters, and on the set Πtemp\Pi_{\mathrm{temp}} of tempered representations of rigid inner twists. Suppose that π˙Πtemp\dot\pi\in\Pi_{\mathrm{temp}} corresponds to (ϕ,ρ)(\phi,\rho). Functoriality conjecture. For every aAa\in A, the representation aπ˙a\dot\pi corresponds to (aϕ,aρ)(a\phi,a\rho). Equivalently, if (G1,ξ1,z1,π1)(G_1,\xi_1,z_1,\pi_1) and (G2,ξ2,z2,π2)(G_2,\xi_2,z_2,\pi_2) correspond to (ϕ,ρ)(\phi,\rho) and (aϕ,aρ)(a\phi,a\rho), respectively, then the naturally constructed isomorphism b:G1G2b:G_1\to G_2 identifies π1\pi_1 with π2\pi_2. This asserts naturality of the refined local Langlands correspondence under the automorphism action; the source presents it as an expected compatibility for connected groups.

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Primary source

Tasho Kaletha, “On the local Langlands conjectures for disconnected groups”, arXiv:2210.02519 (2026).

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