Mathematics – Operator Algebras
Scientific paper
2012-01-12
Mathematics
Operator Algebras
v3: Considerably simplified proof of the main result. v2: Improved exposition; new result proving uniqueness of Cartan for cro
Scientific paper
We prove that for any free ergodic probability measure preserving action
$\Gamma \actson (X,\mu)$ of a non-elementary hyperbolic group, or a lattice in
a rank one simple Lie group, the associated group measure space II_1 factor
$L^\infty(X) \rtimes \Gamma$ has L^\infty(X) as its unique Cartan subalgebra,
up to unitary conjugacy.
Popa Sorin
Vaes Stefaan
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