The Tate conjecture for powers of abelian fourfolds and the Hodge conjecture for powers of CM fourfolds

Abstract

We prove the Tate conjecture in every codimension on every power of an abelian variety of dimension at most four over a finite field. For geometrically simple fourfolds, we use Broe's theorem and the classification of Frobenius relations. For dihedral pairs of abelian surfaces, we construct algebraic classes using families of abelian threefolds, the Gross--Schoen height formula, and polarization contractions. We also prove the Hodge conjecture for every power of a complex CM abelian fourfold, using Markman's theorem on Weil classes and Milne's criterion. The finite field results imply standard conjecture~D and the expected pole orders of the zeta function on every power.

arXiv commentWithdrawn by the author following a reassessment of the paper's contribution in light of recent work on the Hodge and Tate conjectures for abelian varieties. The author no longer plans to pursue this manuscript as a standalone publication and intends to develop selected methods in a separate paper