English

$\mathrm{C}^*$-algebras associated to homeomorphisms twisted by vector bundles over finite dimensional spaces

Operator Algebras 2023-01-06 v2 Dynamical Systems

Abstract

In this paper we study Cuntz--Pimsner algebras associated to C\mathrm{C}^*-correspondences over commutative C\mathrm{C}^*-algebras from the point of view of the C\mathrm{C}^*-algebra classification programme. We show that when the correspondence comes from an aperiodic homeomorphism of a finite-dimensional infinite compact metric space XX twisted by a vector bundle, the resulting Cuntz--Pimsner algebras have finite nuclear dimension. When the homeomorphism is minimal, this entails classification of these C\mathrm{C}^*-algebras by the Elliott invariant. This establishes a dichotomy: when the vector bundle has rank one, the Cuntz--Pimsner algebra has stable rank one. Otherwise, it is purely infinite. For a Cuntz--Pimsner algebra of a minimal homeomorphism of an infinite compact metric space XX twisted by a line bundle over XX, we introduce orbit-breaking subalgebras. With no assumptions on the dimension of XX, we show that they are centrally large subalgebras and hence simple and stably finite. When the dimension of XX is finite, they are furthermore Z\mathcal{Z}-stable and hence classified by the Elliott invariant.

Keywords

Cite

@article{arxiv.2202.10311,
  title  = {$\mathrm{C}^*$-algebras associated to homeomorphisms twisted by vector bundles over finite dimensional spaces},
  author = {Maria Stella Adamo and Dawn E. Archey and Marzieh Forough and Magdalena C. Georgescu and Ja A Jeong and Karen R. Strung and Maria Grazia Viola},
  journal= {arXiv preprint arXiv:2202.10311},
  year   = {2023}
}

Comments

42 pages. Final version. To appear in Trans. Amer. Math. Soc