I. Chifan

activity

20062026

most citedOn the structural theory of II_1 factors of negatively curved groups, II: Actions by product groups

55 citations · 354 across the 38 of their papers we have counts for

collaborators

Showing 2015 · math.OAShow all

3 papers · 2 filters

math.OA2015★ 19 cited

W $^{*}$ -Rigidity for the von Neumann Algebras of Products of Hyperbolic Groups

Ionut Chifan, Rolando de Santiago, Thomas Sinclair

We show that if $Γ = Γ_{1} \times \dots \times Γ_{n}$ is a product of $n \geq 2$ non-elementary ICC hyperbolic groups then any discrete group $Λ$ which is $W^{*}$ -equivalent to $Γ$ decompose…

math.OA2015★ 26 cited

II_1 factors with non-isomorphic ultrapowers

Rémi Boutonnet, Ionut Chifan, Adrian Ioana

We prove that there exist uncountably many separable II $_{1}$ factors whose ultrapowers (with respect to arbitrary ultrafilters) are non-isomorphic. In fact, we prove that the famili…

math.OA2015★ 19 cited

OE and W* superrigidity results for actions by surface braid groups

Ionut Chifan, Yoshikata Kida

We show that several important normal subgroups $Γ$ of the mapping class group of a surface satisfy the following property: any free, ergodic, probability measure preserving action…

W∗-Rigidity for the von Neumann Algebras of Products of Hyperbolic Groups

II_1 factors with non-isomorphic ultrapowers

OE and W* superrigidity results for actions by surface braid groups

W $^{*}$ -Rigidity for the von Neumann Algebras of Products of Hyperbolic Groups