pp-adic cohomological Sarnak–Xue density hypothesis

Let GG be a definite Gross inner form of SO5SO_5 over a number field, let pp be a prime of the number field, let Gp=G(Qp)G_p=G(\mathbb{Q}_p), let Γp(q)\Gamma_p(q) be the level-qq pp-arithmetic subgroup, let Π(Gp)\Pi(G_p) be the irreducible admissible representations of GpG_p, and let r(π)r(\pi) and m(π;q)m(\pi;q) denote the rate of decay of matrix coefficients and the multiplicity in L2(Γp(q)\Gp)L^2(\Gamma_p(q)\backslash G_p), respectively. pp-adic cohomological Sarnak–Xue density hypothesis. For any πΠ(Gp)\pi\in\Pi(G_p),

m(π;q)vol(Γp(q)\Gp)2r(π).m(\pi;q)\ll\operatorname{vol}(\Gamma_p(q)\backslash G_p)^{\frac{2}{r(\pi)}}.

This is the proposed pp-adic analogue for definite Gross inner forms; the source does not state whether it is resolved.

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Primary source

Shai Evra, Mathilde Gerbelli-Gauthier and Henrik P. A. Gustafsson, “The Cohomological Sarnak-Xue Density Hypothesis for SO_5”, arXiv:2309.12413 (2025).

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