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Published online by Cambridge University Press: 19 February 2021
We provide an easy method for the construction of characteristic polynomials of simple ordinary abelian varieties ${{\mathcal A}}$ of dimension g over a finite field
${{\mathbb F}}_q$, when
$q\ge 4$ and
$2g=\rho ^{b-1}(\rho -1)$, for some prime
$\rho \ge 5$ with
$b\ge 1$. Moreover, we show that
${{\mathcal A}}$ is absolutely simple if
$b=1$ and g is prime, but
${{\mathcal A}}$ is not absolutely simple for any prime
$\rho \ge 5$ with
$b>1$.