Compact Fourier transform compatibility for pure inner twists

Let GG be a connected reductive FF-split group. For a unipotent element uotinG?u otin G^\text{?}, a compact pair (s,h)otin?(s,h) otin \text{?}, and a maximal compact open subgroup KK of GG, let resK\operatorname{res}_K denote parahoric restriction and let FTK{\rm FT}_K denote the corresponding nonabelian Fourier transform. Compact Fourier transform compatibility conjecture. There \exists a root of unity ?\text{?} such that

resK(?)=?(FTK?)(?).\operatorname{res}_K(\text{?})=\text{?}({\rm FT}_K\text{?})(\text{?}).

This predicts compatibility between the dual compact nonabelian Fourier transform on compact representations and the finite reductive-group Fourier transform after parahoric restriction. The supplied text gives no resolution status.

Sources & referencesView supporting material

Primary source

Anne-Marie Aubert, Dan Ciubotaru and Beth Romano, “A nonabelian Fourier transform for tempered unipotent representations, II”, arXiv:2606.14485 (2026).

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