Refined local Langlands correspondence for p-adic quasi-split groups

From papers

Let LG=G^Γ{^LG}=\widehat{G}\rtimes\Gamma be the LL-group of a quasi-split group G\mathbf G, and let φ:WDFLG\varphi:\mathrm{WD}_F\to {^LG} be an LL-parameter with LL-packet Πφ\Pi_\varphi. Define Sφ=ZG^(φ(WDF))S_\varphi=Z_{\widehat{G}}(\varphi(\mathrm{WD}_F)), Sφ=Sφ/Z(G^)Γ\overline{S}_\varphi=S_\varphi/Z(\widehat{G})^\Gamma, and let π0(Sφ)\pi_0(\overline{S}_\varphi) be the component group. A Whittaker datum is denoted by w\mathfrak w.

Refined local Langlands correspondence for pp-adic quasi-split groups. The following should hold: for every LL-parameter φ\varphi, there is a bijection

Πφ(G)Irr(π0(Sφ));\Pi_\varphi(\mathbf G)\longrightarrow \operatorname{Irr}(\pi_0(\overline{S}_\varphi));

for every Whittaker datum w\mathfrak w, each tempered LL-packet contains a unique w\mathfrak w-generic representation; for tempered φ\varphi, there is a bijection ιw\iota_{\mathfrak w} as above, depending on w\mathfrak w, that maps this generic representation to the trivial representation; and the bijection is characterized by suitable character identities, with dim(ιw(π))\dim(\iota_{\mathfrak w}(\pi)) independent of w\mathfrak w.

These are desiderata for the refined local Langlands correspondence and are used as working hypotheses in the paper. The source does not indicate a general resolution.

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Sources & referencesView supporting material

Primary source

Yiyang Wang, “Formal Degrees and Parabolic Induction: the Maximal Generic Case”, arXiv:2402.16456 (2025).

Additional references

2 papers in this index state this conjecture (2022–2024). The statement above is taken from the most recent of them; the others are arXiv:2201.07741.

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