C*-simplicity has no local obstruction

Abstract

In 2016, I solved a problem of de la Harpe in 2006: Is there a non-discrete C*-simple group? However the solution was not fully satisfactory as the provided C*-simple groups (and their operator algebras) are very close to discrete groups. All previously known examples are of this form. In this article I give yet another construction of non-discrete C*-simple groups. The statement in the title then follows. This in particular gives the first examples of non-elementary C*-simple groups (in Wesolek's sense).

Small corrections in the proofs of 2.1 and 4.1, other minor modifications, 9 pages, to appear in Forum of Mathematics, Sigma

References in corpus (2)

• Boundaries of reduced C*-algebras of discrete groups
• Elementary totally disconnected locally compact groups

Cited by in corpus (2)

• Simplicity of crossed products of the actions of totally disconnected locally compact groups on their boundaries
• Simplicity and tracial weights on non-unital reduced crossed products