English

Nonsingular Bernoulli actions of arbitrary Krieger type

Dynamical Systems 2022-10-12 v3 Group Theory Operator Algebras

Abstract

We prove that every infinite amenable group admits Bernoulli actions of any possible Krieger type, including type IIII_\infty and type III0III_0. We obtain this result as a consequence of general results on the ergodicity and Krieger type of nonsingular Bernoulli actions GgG(X0,μg)G \curvearrowright \prod_{g \in G} (X_0,\mu_g) with arbitrary base space X0X_0, both for amenable and for nonamenable groups. Earlier work focused on two point base spaces X0={0,1}X_0 = \{0,1\}, where type IIII_\infty was proven not to occur.

Keywords

Cite

@article{arxiv.2005.06309,
  title  = {Nonsingular Bernoulli actions of arbitrary Krieger type},
  author = {Tey Berendschot and Stefaan Vaes},
  journal= {arXiv preprint arXiv:2005.06309},
  year   = {2022}
}

Comments

v3: minor revisions, final version, to appear in Analysis and PDE

R2 v1 2026-06-23T15:30:54.109Z