English

When central sequence C*-algebras have characters

Operator Algebras 2014-12-01 v2

Abstract

We investigate C*-algebras whose central sequence algebra has no characters, and we raise the question if such C*-algebras necessarily must absorb the Jiang-Su algebra (provided that they also are separable). We relate this question to a question of Dadarlat and Toms if the Jiang-Su algebra always embeds into the infinite tensor power of any unital C*-algebra without characters. We show that absence of characters of the central sequence algebra implies that the C*-algebra has the so-called strong Corona Factorization Property, and we use this result to exhibit simple nuclear separable unital C*-algebras whose central sequence algebra does admit a character. We show how stronger divisibility properties on the central sequence algebra imply stronger regularity properties of the underlying C*-algebra.

Keywords

Cite

@article{arxiv.1409.1395,
  title  = {When central sequence C*-algebras have characters},
  author = {Eberhard Kirchberg and Mikael Rordam},
  journal= {arXiv preprint arXiv:1409.1395},
  year   = {2014}
}

Comments

28 pages

R2 v1 2026-06-22T05:48:27.752Z