Thouvenot’s Isomorphism Problem for Tensor Powers of Ergodic Flows
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Let S and T be automorphisms of a probability space whose powers S ⊗ S and T ⊗ T isomorphic. Are the automorphisms S and T isomorphičThis question of Thouvenot is well known in ergodic theory. We answer this question and generalize a result of Kulaga concerning isomorphism in the case of flows. We show that if weakly mixing flows St ⊗ St and Tt ⊗ Tt are isomorphic, then so are the flows St and Tt, provided that one of them has a weak integral limit.
Keywordsflow with invariant measure weak closure tensor power of a dynamical system metric isomorphism
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