Crossed products with noncommutative Bernoulli actions were introduced by Connes as the first examples of full factors of type III. This article provides a complete classification of the factors (P, φ)Fn ⋊ F n , where F n is the free group and P is an amenable factor with an almost periodic state φ. We show that these factors are completely classified by the rank n of the free group F n and Connes's Sd-invariant. We prove similar results for free product groups, as well as for classes of generalized Bernoulli actions.

We obtain a spectral gap characterization of strongly ergodic equivalence relations on standard measure spaces. We use our spectral gap criterion to prove that a large class of skew-product equivalence relations arising from measurable 1-cocycles with values into locally compact abelian groups are strongly ergodic. By analogy with the work of Connes on full factors, we introduce the Sd and τ invariants for type III strongly ergodic equivalence relations. As a corollary to our main results, we show that for any type III1 ergodic equivalence relation R, the Maharam extension c(R) is strongly ergodic if and only if R is strongly ergodic and the invariant τ (R) is the usual topology on R. We also obtain a structure theorem for almost periodic strongly ergodic equivalence relations analogous to Connes' structure theorem for almost periodic full factors. Finally, we prove that for arbitrary strongly ergodic free actions of bi-exact groups (e.g. hyperbolic groups), the Sd and τ invariants of the orbit equivalence relation and of the associated group measure space von Neumann factor coincide.

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We prove a classification result for a large class of noncommutative Bernoulli crossed products (P, φ) Λ ⋊ Λ without almost periodic states. Our results improve the classification results from [VV14], where only Bernoulli crossed products built with almost periodic states could be treated. We show that the family of factors (P, φ) Λ ⋊ Λ with P an amenable factor, φ a weakly mixing state (i.e. a state for which the modular automorphism group is weakly mixing) and Λ belonging to a large class of groups, is classified by the group Λ and the action Λ (P, φ) Λ , up to state preserving conjugation of the action.