English

Universal deformation rings and self-injective Nakayama algebras

Group Theory 2019-03-20 v2 Representation Theory

Abstract

Let kk be a field and let Λ\Lambda be an indecomposable finite dimensional kk-algebra such that there is a stable equivalence of Morita type between Λ\Lambda and a self-injective split basic Nakayama algebra over kk. We show that every indecomposable finitely generated Λ\Lambda-module VV has a universal deformation ring R(Λ,V)R(\Lambda,V) and we describe R(Λ,V)R(\Lambda,V) explicitly as a quotient ring of a power series ring over kk in finitely many variables. This result applies in particular to Brauer tree algebras, and hence to pp-modular blocks of finite groups with cyclic defect groups.

Keywords

Cite

@article{arxiv.1702.02841,
  title  = {Universal deformation rings and self-injective Nakayama algebras},
  author = {Frauke M. Bleher and Daniel J. Wackwitz},
  journal= {arXiv preprint arXiv:1702.02841},
  year   = {2019}
}

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24 pages