Relative Property (T) Actions and Trivial Outer Automorphism Groups

Details Relative Property (T) Actions and Trivial Outer Automorphism Groups Relative Property (T) Actions and Trivial Outer Automorphism Groups

2008-04-02

arxiv.org/abs/0804.0358v2

Mathematics

Operator Algebras

Improvement in the presentation of the replacement trick. Introduction of compressions for non-ergodic equivalence relations

Scientific paper

We show that every non-amenable free product of groups admits free ergodic probability measure preserving actions which have relative property (T) in the sense of S.-Popa \cite[Def. 4.1]{Pop06}. There are uncountably many such actions up to orbit equivalence and von Neumann equivalence, and they may be chosen to be conjugate to any prescribed action when restricted to the free factors. We exhibit also, for every non-amenable free product of groups, free ergodic probability measure preserving actions whose associated equivalence relation has trivial outer automorphisms group. This gives in particular the first examples of such actions for the free group on $2$ generators.

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