Sorin Popa

most citedSome computations of 1-cohomology groups and construction of non orbit equivalent actions

7 citations · 7 across the 4 of their papers we have counts for

collaborators

4 papers

math.OA2004★ 7 cited

Some computations of 1-cohomology groups and construction of non orbit equivalent actions

Sorin Popa

For each group $G$ having an infinite normal subgroup with the relative property (T) (for instance $G = H \times K$ where $H$ is infinite with property (T) and $K$ is arbitrary), a…

math.OA2004

Strong rigidity of II $_{1}$ factors arising from malleable actions of w-rigid groups, II

Sorin Popa

We prove that any isomorphism $θ : M_{0} ≃ M$ of group measure space II $_{1}$ factors, $M_{0} = L^{\infty} (X_{0}, μ_{0}) ⋊_{σ_{0}} G_{0}$ , $M = L^{\infty} (X, μ) ⋊_{σ} G$ , with $G_{0}$ containi…

math.OA2004

On the Notion of Relative Property (T) for Inclusions of Von Neumann Algebras

Jesse Peterson, Sorin Popa

We prove that the notion of relative property (T) (or rigidity) for inclusions of finite von Neumann algebras defined in [Po1] is equivalent to a weaker property, in which no ``con…

math.OA2004

A Unique Decomposition Result for HT Factors with Torsion Free Core

Sorin Popa

We prove that II $_{1}$ factors $M$ have a unique (up to unitary conjugacy) cross-product type decomposition around ``core subfactors'' $N \subset M$ satisfying the property HT and a…

Some computations of 1-cohomology groups and construction of non orbit equivalent actions

Strong rigidity of II1​ factors arising from malleable actions of w-rigid groups, II

On the Notion of Relative Property (T) for Inclusions of Von Neumann Algebras

A Unique Decomposition Result for HT Factors with Torsion Free Core

Strong rigidity of II $_{1}$ factors arising from malleable actions of w-rigid groups, II