On $\ast$-Clean Group Rings over SLC-groups

Abstract

The property of $\ast$-cleanness in group rings has been studied for some groups considering the classical involution, given by $g^{\ast }=g^{-1}$. A group is called an SLC-group if its quotient by its center is isomorphic to the Klein group; these groups are equipped with its own canonical involution, which usually does not coincide with the classical one. In this paper we study the $\ast$-cleanness of $RG$ when $G$ is an SLC-group, considering $\ast$ as its canonical involution. In that context, we prove that if $RG$ is $\ast$-clean then $G$ is the direct product of $Q_8$ and an abelian group with some extra properties and we find a converse for some specific cases, generalizing a result by Gao, Chen and Li for $Q_8$.