Outer-automorphism compatibility conjecture for local Langlands reciprocity

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,

recθ(w)(θ(π˙))=θ(recw(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.

Sources & referencesView supporting material

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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