Zeros and roots of unity in character tables

Abstract

For any finite group $G$, Thompson proved that, for each $\chi \in \mathrm{Irr}(G)$, $\chi (g)$ is a root of unity or zero for more than a third of the elements $g\in G$, and Gallagher proved that, for each larger than average class $g^G$, $\chi (g)$ is a root of unity or zero for more than a third of the irreducible characters $\chi \in \mathrm{Irr}(G)$. We show that in many cases "more than a third" can be replaced by "more than half".