Strongly self-absorbing C*-dynamical systems, III

Gabor Szabo

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5 Citations (Scopus)
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Abstract

In this paper, we accomplish two objectives. Firstly, we extend and improve some results in the theory of (semi-)strongly self-absorbing ⁎C⁎-dynamical systems, which was introduced and studied in previous work. In particular, this concerns the theory when restricted to the case where all the semi-strongly self-absorbing actions are assumed to be unitarily regular, which is a mild technical condition. The central result in the first part is a strengthened version of the equivariant McDuff-type theorem, where equivariant tensorial absorption can be achieved with respect to so-called very strong cocycle conjugacy.Secondly, we establish completely new results within the theory. This mainly concerns how equivariantly Z-stable absorption can be reduced to equivariantly UHF-stable absorption with respect to a given semi-strongly self-absorbing action. Combining these abstract results with known uniqueness theorems due to Matui and Izumi–Matui, we obtain the following main result. If G is a torsion-free abelian group and D is one of the known strongly self-absorbing ⁎C⁎-algebras, then strongly outer G-actions on D are unique up to (very strong) cocycle conjugacy. This is new even for Z3-actions on the Jiang–Su algebra.
Original languageEnglish
Pages (from-to)356-380
Number of pages25
JournalAdvances in Mathematics
Volume316
Early online date24 Jul 2017
DOIs
Publication statusPublished - 20 Aug 2017

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C*-dynamical System
Absorbing
Absorption
Conjugacy
Cocycle
Equivariant
Torsion-free Abelian Group
Uniqueness Theorem
C*-algebra
Algebra
Theorem

Keywords

  • Strongly self-absorbing C*-algebra
  • Noncommutative dynamical systems

Cite this

Strongly self-absorbing C*-dynamical systems, III. / Szabo, Gabor.

In: Advances in Mathematics, Vol. 316, 20.08.2017, p. 356-380.

Research output: Contribution to journalArticle

Szabo, Gabor. / Strongly self-absorbing C*-dynamical systems, III. In: Advances in Mathematics. 2017 ; Vol. 316. pp. 356-380.
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