Moments of Traces of Frobenius of Higher Order Dirichlet $L$-functions over ${\mathbb{F}}_q[T]$

Abstract

We study the moments of $\mbox{Tr}(Θ_χ)$ as $\chi$ runs over Dirichlet characters defined over ${\mathbb{F}}_q[T]$ of fixed order $r$. In particular, we show that after an appropriate normalization, the $q$-limit of the power sum moments behave like the power sum moments of the group of unitary matrices multiplied by a weight function.