Effective characterization of ordinary abelian varieties, and beyond

Abstract

We prove that the Albanese morphism of any normal proper variety $X$ in positive characteristic satisfying $S^0(X,{\omega }_X)\ne 0$ and $P_2(X)=1$ is surjective with connected fibers, adn that $\mathrm{Alb}(X)$ is ordinary. We obtain from a variant of the above a purely positive characteristic proof of Chen and Hacon's effective birational characterization of complex abelian varieties.

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