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arXiv · 2101.05531

Polarizations of abelian varieties over finite fields via canonical liftings

Jonas Bergström·Valentijn Karemaker·Stefano Marseglia
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Abstract

We describe all polarizations for all abelian varieties over a finite field in a fixed isogeny class corresponding to a squarefree Weil polynomial, when one variety in the isogeny class admits a canonical liftings to characteristic zero, i.e., a lifting for which the reduction morphism induces an isomorphism of endomorphism rings. Categorical equivalences between abelian varieties over finite fields and fractional ideals in étale algebras enable us to explicitly compute isomorphism classes of polarized abelian varieties satisfying some mild conditions. We also implement algorithms to perform these computations.

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Jonas Bergström, Valentijn Karemaker, Stefano Marseglia. 2021-11-05. Polarizations of abelian varieties over finite fields via canonical liftings. https://doi.org/10.1093/imrn%2Frnab333

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