Geodesic
Simple modules of small quantum groups at dihedral groups
Documenta mathematica, Tome 29 (2024) no. 1, pp. 1-38

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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 D4t​ with t≥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.
DOI : 10.4171/dm/942
Classification : 16T20, 17B37, 22E47, 17B10
Mots-clés : Hopf algebras, Nichols algebras, representation theory 
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Gastón A. García; Cristian Vay. Simple modules of small quantum groups at dihedral groups. Documenta mathematica, Tome 29 (2024) no. 1, pp. 1-38. doi: 10.4171/dm/942

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