Tensor product decomposition rules for weight modules over the Hopf-Ore extensions of group algebras

Abstract

In this paper, we investigate the tensor structure of the category of finite dimensional weight modules over the Hopf-Ore extensions $kG(\chi^{-1}, a, 0)$ of group algebras $kG$. The tensor product decomposition rules for all indecomposable weight modules are explicitly given under the assumptions that $k$ is an algebraically closed field of characteristic zero, and the orders of $\chi$ and $\chi(a)$ are the same.