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arXiv:2309.12413v2 Announce Type: replace
Abstract: We prove the cohomological version of the Sarnak-Xue Density Hypothesis for $SO_5$ over a totally real field and for inner forms split at all finite places. The proof relies on recent lines of work in the Langlands program: (i) Arthur's Endoscopic Classification of Representations of classical groups, and (ii) the Generalized Ramanujan-Petersson Theorem, proved for cohomological self-dual cuspidal representations of general linear groups. We give applications for the growth of cohomology of arithmetic manifolds, density-Ramanujan complexes, cutoff phenomena and optimal strong approximation.
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