Geometric comparison of complex and pp-adic Arthur–Vogan packets

Let nn, rr, kik_i, and mim_i be as above, and let ψ\BR\psi^\BR denote the corresponding parameter on the complex side. On the pp-adic side, let ψp\psi^p and the Arthur–Vogan packets ΠψpA-V\Pi_{\psi^p}^{\text{A-V}} be as defined above. Geometric comparison conjecture. When nn is even, there is a bijection

Πψ\BRA-V\bijectsΠψpA-V.\Pi_{\psi^\BR}^{\text{A-V}} \bijects \Pi_{\psi^p}^{\text{A-V}}.

When nn is odd, there is a bijection

⨆p+q=np≡n−12mod2Πψ\BR\bU(p,q)\bijectsΠψpA-V.\bigsqcup_{\substack{ p + q = n\\ p \equiv \frac{n-1}{2} \, {\rm mod} \, 2 }} \Pi_{\psi^\BR}^{\bU(p,q)} \bijects \Pi_{\psi^{p}}^{\text{A-V}}.

This proposes a direct comparison between the complex and pp-adic Arthur–Vogan packets, with the parity of nn determining whether one complex packet or a disjoint union over unitary groups occurs. The source provides no resolution, so the conjecture remains open.

References

Primary source

Taiwang Deng, Chang Huang, Bin Xu and Qixian Zhao, “On a geometric comparison of representations of complex and p-adic GL_n”, arXiv:2504.15653 (2026).

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