Outer-automorphism compatibility conjecture for local Langlands reciprocity

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Let GG be a reductive group, let \OutF(G)\Out_F(G) be its group of FF-rational outer automorphisms, let θ∈\OutF(G)\theta\in\Out_F(G), and let w\mathfrak w be a Whittaker datum. Outer-automorphism compatibility conjecture. For every relevant irreducible representation π˙\dot\pi,

rec⁡θ(w)(θ(π˙))=θ(rec⁡w(π˙)).\operatorname{rec}_{\theta(\mathfrak w)}\bigl(\theta(\dot\pi)\bigr)=\theta\bigl(\operatorname{rec}_{\mathfrak w}(\dot\pi)\bigr).

This predicts equivariance of the refined local Langlands correspondence, including the possibility that outer automorphisms move representations between rigid inner twists.

References

Primary source

Peter Dillery and David Schwein, “A stacky generalized Springer correspondence and rigid enhancements of L-parameters”, arXiv:2308.11752 (2024).

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