Some unique group-measure space decomposition results

Details Some unique group-measure space decomposition results Some unique group-measure space decomposition results

2010-10-25

arxiv.org/abs/1010.5194v2

Mathematics

Operator Algebras

Revised proofs in Section 4

Scientific paper

Using an approach emerging from the theory of closable derivations on von Neumann algebras, we exhibit a class of groups CR satisfying the following property: given any groups G_1, G_2 in CR, then any free, ergodic, measure preserving action on a probability space G_1 x G_2 on X gives rise to a von Neumann algebra with unique group measure space Cartan subalgebra. Pairing this result with Popa's Orbit Equivalence Superrigidity Theorem we obtain new examples of W*-superrigid actions.

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