Simple modules of small quantum groups at dihedral groups

TL;DR

This paper computes irreducible characters of Drinfeld doubles of bosonizations of Nichols algebras over dihedral groups, introducing new recursive techniques for representation construction applicable to various Hopf algebras.

Contribution

It develops novel recursive methods for constructing simple modules and analyzing their properties in the context of Nichols algebras over dihedral groups.

Findings

Computed irreducible characters for Drinfeld doubles over dihedral groups.

Developed recursive techniques for irreducible representation construction.

Proved tensoring with rigid modules yields semisimple modules.

Abstract

Based on previous results on the classification of finite-dimensional Nichols algebras over dihedral groups and the characterization of simple modules of Drinfeld doubles, we compute the irreducible characters of the Drinfeld doubles of bosonizations of finite-dimensional Nichols algebras over the dihedral groups $\mathbb{D}_{4t}$ with $t\geq 3$. To this end, we develop new techniques that can be applied to Nichols algebras over any Hopf algebra. Namely, we explain how to construct recursively irreducible representations when the Nichols algebra is generated by a decomposable module, and show that the highest-weight of minimum degree in a Verma module determines its socle. We also prove that tensoring a simple module by a rigid simple module gives a semisimple module.