Bernoulli actions are weakly contained in any free action

Details Bernoulli actions are weakly contained in any free action Bernoulli actions are weakly contained in any free action

2011-03-05

arxiv.org/abs/1103.1063v2

Mathematics

Dynamical Systems

typos corrected

Scientific paper

We show that for any countable group, any free probability measure preserving action of the group weakly contains all Bernoulli actions of the group. It follows that for a finitely generated groups, the cost is maximal on Bernoulli actions and that all free factors of i.i.d.-s the group have the same cost. We also show that if a probability measure preserving action f is ergodic, but not strongly ergodic, then f is weakly equivalent to f\timesI where I denotes the trivial action on the unit interval. This leads to a relative version of the Glasner-Weiss dichotomy.

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