Non-commutativity of the central sequence algebra for separable non-type I C$^{\ast}$-algebras
Operator Algebras
2017-05-17 v2
Abstract
We show that if is a separable, simple and non-type I C algebra, then for every properly infinite hyperfinite von Neumann algebra with separable predual, its Ocneanu ultrapower arises as a sub-quotient of the central sequence algebra defined by the second named author. In particular, this answers affirmatively the question of the second named author (Abel Symposium '04): the central sequence C-algebra of the reduced free group C-algebra is non-commutative.
Keywords
Cite
@article{arxiv.1510.00468,
title = {Non-commutativity of the central sequence algebra for separable non-type I C$^{\ast}$-algebras},
author = {Hiroshi Ando and Eberhard Kirchberg},
journal= {arXiv preprint arXiv:1510.00468},
year = {2017}
}
Comments
15 pages, same as the published version. We added Ozawa's proof (using Kishimoto-Ozawa-Sakai Theorem) of non-commutativity of F(A) in Appendix