English

A universal coefficient theorem for actions of finite groups on C*-algebras

Operator Algebras 2026-02-25 v2 K-Theory and Homology

Abstract

The equivariant bootstrap class in the Kasparov category of actions of a finite group G consists of those actions that are equivalent to one on a Type I C*-algebra. Using a result by Arano and Kubota, we show that this bootstrap class is already generated by the continuous functions on G/H for all cyclic subgroups H of G. Then we prove a Universal Coefficient Theorem for the localisation of this bootstrap class at the group order |G|. This allows us to classify certain G-actions on stable Kirchberg algebras up to cocycle conjugacy.

Keywords

Cite

@article{arxiv.2406.11787,
  title  = {A universal coefficient theorem for actions of finite groups on C*-algebras},
  author = {Ralf Meyer and George Nadareishvili},
  journal= {arXiv preprint arXiv:2406.11787},
  year   = {2026}
}

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18 pages