Center-preserving irreducible representations of finite groups
Abstract
Given finite groups , a representation of is called center-preserving on if the only elements of that become central under are those that were already central in . We prove that if has a faithful irreducible representation , then at least one of the irreducible components of the induction is center-preserving on . In consequence, has a faithful irreducible representation if and only if every finite group containing as a subgroup has an irreducible representation whose restriction to is faithful, and which is center-preserving on . In addition, we give examples illustrating the sharpness of the statement, and discuss the connection with projective representations.
Keywords
Cite
@article{arxiv.2601.15266,
title = {Center-preserving irreducible representations of finite groups},
author = {Pierre-Emmanuel Caprace and Geoffrey Janssens and François Thilmany},
journal= {arXiv preprint arXiv:2601.15266},
year = {2026}
}
Comments
19 pages. This second version includes minor corrections and improvements. Comments are welcome