English

Orbit equivalence rigidity for product actions

Operator Algebras 2020-01-08 v2 Dynamical Systems Functional Analysis

Abstract

Let Γ1,,Γn\Gamma_1,\dots,\Gamma_n be hyperbolic, property (T) groups, for some n1n\ge 1. We prove that if a product Γ1××ΓnX1××Xn\Gamma_1\times\dots\times\Gamma_n \curvearrowright X_1\times\dots\times X_n of measure preserving actions is stably orbit equivalent to a measure preserving action ΛY\Lambda\curvearrowright Y, then ΛY\Lambda\curvearrowright Y is induced from an action Λ0Y0\Lambda_0\curvearrowright Y_0 such that there exists a direct product decomposition Λ0=Λ1××Λn\Lambda_0=\Lambda_1\times\dots\times\Lambda_n into nn infinite groups. Moreover, there exists a measure preserving action ΛiYi\Lambda_i\curvearrowright Y_i that is stably orbit equivalent to ΓiXi\Gamma_i\curvearrowright X_i, for any 1in1\leq i\leq n, and the product action Λ1××ΛnY1××Yn\Lambda_1\times\dots\times\Lambda_n\curvearrowright Y_1\times\dots\times Y_n is isomorphic to Λ0Y0\Lambda_0\curvearrowright Y_0.

Keywords

Cite

@article{arxiv.1905.07642,
  title  = {Orbit equivalence rigidity for product actions},
  author = {Daniel Drimbe},
  journal= {arXiv preprint arXiv:1905.07642},
  year   = {2020}
}

Comments

To appear in Communications in Mathematical Physics

R2 v1 2026-06-23T09:11:40.945Z