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Orbit equivalence rigidity for product actions

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Orbit equivalence rigidity for product actions
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17
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CC Attribution - NonCommercial - NoDerivatives 4.0 International:
You are free to use, copy, distribute and transmit the work or content in unchanged form for any legal and non-commercial purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
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In this talk we provide a natural complement to Monod and Shalom's orbit equivalence superrigidity theorem for irreducible actions of product groups by providing a large class of product actions whose orbit equivalence relation remember the product structure. More precisely, we show that if a product Γ1×⋯×Γn↷X1×⋯×Xn of measure preserving actions is stably orbit equivalent to a measure preserving action Λ↷Y, then Λ↷Y is induced from an action Λ0↷Y0 and there exists a direct product decomposition Λ0=Λ1×⋯×Λn into n infinite groups. Moreover, there exists a measure preserving action Λi↷Yi that is stably orbit equivalent to Γi↷Xi, for any 1≤i≤n, and the product action Λ1×⋯×Λn↷Y1×⋯×Yn is isomorphic to Λ0↷Y0.