Actions on classifiable C*-algebras without equivariant property (SI)

Eusebio Gardella, Julian Kranz, Andrea Vaccaro

Research output: Contribution to journalArticlepeer-review

Abstract

We exhibit examples of actions of countable discrete groups on both simple and non-simple nuclear stably finite C*-algebras that are tracially amenable but not amenable. We furthermore obtain that, under the additional assumption of strict comparison, amenability is equivalent to tracial amenability plus the equivariant analogue of Matui–Sato's property (SI). By virtue of this equivalence, our construction yields the first known examples of actions on classifiable C*-algebras that do not have equivariant a over show that such actions can be chosen to absorb the trivial action on the universal UHF algebra, thus proving that equivariant (Formula presented.) -stability does not in general imply equivariant property (SI).

Original languageEnglish
Pages (from-to)3623-3633
Number of pages11
JournalBulletin of the London Mathematical Society
Volume56
Issue number12
DOIs
StatePublished - 1 Dec 2024
Externally publishedYes

ASJC Scopus subject areas

  • General Mathematics

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