Alejandro J. Giangreco-Maidana - Some arithmetic properties of Weil polynomials of the form $t^{2g}+at^g+q^g$

cm:15946 - Communications in Mathematics, September 29, 2025, Volume 34 (2026), Issue 2 (Special issue: "Latin American mathematics") - https://doi.org/10.46298/cm.15946
Some arithmetic properties of Weil polynomials of the form $t^{2g}+at^g+q^g$Article

Authors: Alejandro J. Giangreco-Maidana

    An isogeny class $\mathcal{A}$ of abelian varieties defined over finite fields is said to be "cyclic" if every variety in $\mathcal{A}$ has a cyclic group of rational points. In this paper we study the local cyclicity of Weil-central isogeny classes of abelian varieties, i.e. those with Weil polynomials of the form $f_\mathcal{A}(t)=t^{2g}+at^g+q^g$, as well as the local growth of the groups of rational points of the varieties in $\mathcal{A}$ after finite field extensions. We exploit the criterion: an isogeny class $\mathcal{A}$ with Weil polynomial $f$ is cyclic if and only if $f'(1)$ is coprime with $f(1)$ divided by its radical.


    Volume: Volume 34 (2026), Issue 2 (Special issue: "Latin American mathematics")
    Published on: September 29, 2025
    Accepted on: September 19, 2025
    Submitted on: June 27, 2025
    Keywords: Number Theory, Algebraic Geometry, 11G10, 14G15, 14K15