Continuous families of hyperfinite subfactors with the same standard invariant

Research paper by Dietmar Bisch, Remus Nicoara, Sorin Popa

Indexed on: 06 Jun '06Published on: 06 Jun '06Published in: Mathematics - Operator Algebras

Abstract

We construct numerous continuous families of irreducible subfactors of the hyperfinite II$_1$ factor, which are non-isomorphic, but have all the same standard invariant. In particular, we obtain 1-parameter families of irreducible, non-isomorphic subfactors of the hyperfinite II$_1$ factor, which have Jones index 6 and have all the same standard invariant with property (T). We exploit the fact that property (T) groups have uncountably many non-cocycle conjugate cocycle actions on the hyperfinite II$_1$ factor.