A note on the extended Bruinier-Kohnen conjecture

Abstract

Let $f$ be a cuspform of integral half-weight $k+1/2$, whose Fourier coefficients $a(n)$ not necessarily real. We verify partially an extension of a conjecture of Bruinier and Kohnen on the equi-distribution of the signs of $a(n)$ (when are real), conjectured by the first author in \cite{Amri2} for the sequence $\{a(tp^{2ν})\}_{p,\text{prime}}$, where $ν$ an odd positive integer and $t$ a square-free integer.