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arXiv · 2608.23844

Poincar\'e duality in Hida families

Dmitrii Krekov
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Abstract

We construct a bilinear pairing for $p$-adic families of cohomology classes associated to locally symmetric spaces of a certain level at $p$ and obtain a comparison between the specialisations of constructed pairing and the natural duality pairings on cohomology of automorphic sheaves under specialisation maps. We show that the considered locally symmetric spaces with the chosen level admit an automorphism which naturally generalises the Atkin--Lehner involution for modular curves and interchanges the ordinary and anti-ordinary parts of the cohomology thereby making it possible to pair two anti-ordinary classes. Our construction is motivated by the pairing constructed by Ohta for modular curves and recovers it.

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Dmitrii Krekov. 2026-08-24. Poincar\'e duality in Hida families. https://arxiv.org/abs/2608.23844

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