Fusion rings arising from normal Hopf subalgebras

Abstract

For any normal commutative Hopf subalgebra $K=k^G$ of a semisimple Hopf algebra we describe the ring inside $kG$ obtained by the restriction of $H$-modules. If $G={\mathbb{Z}}_p$ this ring determines a fusion ring and we give a complete description for it. The case $G={\mathbb{Z}}_{p^n}$ and some other applications are presented.

17 pages, no figures, accepted to ART

References in corpus (3)

• Weakly group-theoretical and solvable fusion categories
• Hopf algebra extensions of group algebras and Tambara-Yamagami categories
• Coset decomposition for semisimple Hopf algebras