English

Intermediate crossed product $C^*$-algebras

Operator Algebras 2023-11-06 v1 Functional Analysis

Abstract

Let BB be a separable CC^*-algebra, let Γ\Gamma be a discrete countable group, let α:ΓAut(B)\alpha: \Gamma \to \text{Aut}(B) be an action, and let AA be an invariant subalgebra. We find certain freeness conditions which guarantee that any intermediate CC^*-algebra Aα,rΓCBα,rΓA \rtimes_{\alpha,r} \Gamma \subseteq C \subseteq B \rtimes_{\alpha,r} \Gamma is a crossed product of an intermediate invariant subalgebra AC0BA \subseteq C_0 \subseteq B by Γ\Gamma. Those are used to generalize related results by Suzuki.

Keywords

Cite

@article{arxiv.2311.01524,
  title  = {Intermediate crossed product $C^*$-algebras},
  author = {Tattwamasi Amrutam and Ilan Hirshberg and Apurva Seth},
  journal= {arXiv preprint arXiv:2311.01524},
  year   = {2023}
}

Comments

Preliminary version. Comments are welcome. 29 Pages

R2 v1 2026-06-28T13:10:02.654Z