The local Langlands parametrization conjecture for disconnected even orthogonal groups

Let HH be a pp-adic symplectic group or split special orthogonal group, and in the special even orthogonal case let H+H^+ be the corresponding full even orthogonal group. Let Φ(H+)λQp\Phi(H^+)_{\lambda^{\mathbb{Q}_p}} be the quotient of the parameter set by H^+\widehat{H}^+-conjugation, and define Ξ(λQp,H+)\Xi(\lambda^{\mathbb{Q}_p},H^+) using the component-group characters A^ϕQp+\widehat{A}^+_{\phi^{\mathbb{Q}_p}}. The local Langlands parametrization conjecture. There should be a bijection

Πmpure(λQp,H+)Ξ(λQp,H+):={(ϕQp,ϵ)ϕQpΦ(H+)λQp, ϵA^ϕQp+}.\Pi_{{\mathrm{m}\,\mathrm{pure}}}(\lambda^{\mathbb{Q}_p},H^+)\xrightarrow{\sim}\Xi(\lambda^{\mathbb{Q}_p},H^+):=\{(\phi^{\mathbb{Q}_p},\epsilon)\mid \phi^{\mathbb{Q}_p}\in\Phi(H^+)_{\lambda^{\mathbb{Q}_p}},\ \epsilon\in\widehat{A}^+_{\phi^{\mathbb{Q}_p}}\}.

This is the expected extension of the local Langlands correspondence from connected reductive groups to the disconnected full even orthogonal group; the source gives no resolution status.

Sources & referencesView supporting material

Primary source

Taiwang Deng, Chang Huang, Bin Xu and Qixian Zhao, “Relating Arthur packets of real unitary groups and p-adic symplectic and orthogonal groups”, arXiv:2603.16314 (2026).

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