74 citations · 125 across the 11 of their papers we have counts for
4 papers · 1 filter
On Ozawa's Property for Free Group Factors
Sorin Popa
We give a new proof of a result of Ozawa showing that if a von Neumann subalgebra of a free group factor has relative commutant diffuse (i.e. wi…
On the Superrigidity of Malleable Actions with Spectral Gap
Sorin Popa
We prove that if a countable group contains infinite commuting subgroups with non-amenable and ``weakly normal'' in , then any measure preserving $…
Strong rigidity of generalized Bernoulli actions and computations of their symmetry groups
Sorin Popa, Stefaan Vaes
We study equivalence relations and II_1 factors associated with (quotients of) generalized Bernoulli actions of Kazhdan groups. Specific families of these actions are entirely clas…
Continuous families of hyperfinite subfactors with the same standard invariant
Dietmar Bisch, Remus Nicoara, Sorin Popa
We construct numerous continuous families of irreducible subfactors of the hyperfinite II factor, which are non-isomorphic, but have all the same standard invariant. In particu…