The tempered local Langlands correspondence for rigid inner forms

Let GG^{*} be a connected, reductive, quasi-split group over the local function field FF, with finite central FF-subgroup ZZ, and let GG be an inner form of GG^{*}. Fix a Whittaker datum w\mathfrak{w} for GG^{*}. For a tempered Langlands parameter φ ⁣:WFLG\varphi\colon W_{F}'\to {}^{L}G, set Sφ=ZG^(φ)S_{\varphi}=Z_{\widehat{G}}(\varphi) and let Sφ+S_{\varphi}^{+} be its preimage in G^\widehat{\overline{G}}, where G=G/Z\overline{G}=G/Z. Write Πtemprig(G)\Pi_{\mathrm{temp}}^{\mathrm{rig}}(G^{*}) for the set of tempered irreducible admissible representations of rigid inner twists of GG^{*}, and let Irr(π0(Sφ+))\operatorname{Irr}(\pi_{0}(S_{\varphi}^{+})) denote the irreducible representations of the finite group π0(Sφ+)\pi_{0}(S_{\varphi}^{+}). The tempered local Langlands correspondence conjecture. There is a finite subset ΠφΠtemprig(G)\Pi_{\varphi}\subset\Pi_{\mathrm{temp}}^{\mathrm{rig}}(G^{*}) and a commutative diagram

\begin{tikzcd} \Pi_{\varphi} \arrow["\iota_{\mathfrak{w}}"]{r} \arrow{d} & \operatorname{Irr}(\pi_{0}(S_{\varphi}^{+})) \arrow{d} \\ H^{1}(\mathcal{E}, Z \to G^{*}) \arrow{r} & \pi_{0}(Z(\widehat{\overline{G}})^{+})^{*} \end{tikzcd}

in which the top map is a bijection, the bottom map is given by the relevant pairing, the right map assigns to each irreducible representation the restriction of its central character to π0(Z(G^)+)\pi_{0}(Z(\widehat{\overline{G}})^{+}), and the left map sends (G1,ξ1,T1,hˉ,π)(G_{1},\xi_{1},\mathscr{T}_{1},\bar h,\pi) to the class of T1\mathscr{T}_{1}. Moreover, there is a unique element (G,idG,GE,idFˉ,π)(G,\operatorname{id}_{G},G_{\mathcal{E}},\operatorname{id}_{\bar F},\pi) of Πφ\Pi_{\varphi} such that π\pi is w\mathfrak{w}-generic and ιw\iota_{\mathfrak{w}} identifies it with the trivial irreducible representation.

Sources & referencesView supporting material

Primary source

Peter Dillery, “Rigid inner forms over local function fields”, arXiv:2008.04472 (2023).

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