A secondary term in the first moment of primitive cubic Dirichlet L-functions

Abstract

P. Gao and L. Zhao obtained an asymptotic formula for the smoothed first moment of primitive cubic Dirichlet $L$-functions over $Q$ with conductors coprime to $3$, with a main term of order $Q$ and error \(O\left(Q^{\frac{7}{8}+\eps}\right)\) under the generalized Lindelöf hypothesis. Building on their double Dirichlet series, we assume the generalized Riemann hypothesis and separate an explicit secondary term of order $Q^{\frac{5}{6}}$, with error $O\left(Q^{\frac{23}{28}+\eps}\right)$.