English

Trivial source characters in blocks of domestic representation type

Representation Theory 2026-03-20 v2

Abstract

Let GG be a finite group of even order, let kk be an algebraically closed field of characteristic 22, and let BB be a block of the group algebra kGkG which is of domestic representation type. Up to splendid Morita equivalence, precisely three cases can occur: kV4kV_4, kA4k\mathfrak{A}_4 and the principal block of kA5k\mathfrak{A}_5. In each case, given the character values of the ordinary irreducible characters of BB, we determine the ordinary characters of all trivial source BB-modules.

Keywords

Cite

@article{arxiv.2503.21703,
  title  = {Trivial source characters in blocks of domestic representation type},
  author = {Bernhard Böhmler},
  journal= {arXiv preprint arXiv:2503.21703},
  year   = {2026}
}

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29 pages