English

Examples for the standard conjecture of Hodge type

Algebraic Geometry 2025-11-14 v2 Number Theory

Abstract

For each prime number pp and each integer g5g \geqslant 5, we construct infinitely many abelian varieties of dimension gg over Fp\overline{\mathbb{F}}_p satisfying the standard conjecture of Hodge type. The main tool is a recent theorem of Ancona on certain rank 22 motives. These varieties are constructed explicitly through Honda-Tate theory. Moreover, they have Tate classes that are not generated by divisors nor liftable to characteristic zero. Also, we prove a result towards a classification of simple abelian varieties for which the result of Ancona can be applied to. Along the way, we prove results of independent interest about Honda-Tate theory and about multiplicative relations between algebraic integers.

Keywords

Cite

@article{arxiv.2401.17445,
  title  = {Examples for the standard conjecture of Hodge type},
  author = {Thomas Agugliaro},
  journal= {arXiv preprint arXiv:2401.17445},
  year   = {2025}
}

Comments

revised version, accepted in Documenta Mathematica; 38 pages. Comments welcome!

R2 v1 2026-06-28T14:32:29.719Z