A salad of cocycles
arXiv:math/0408166
Abstract
We study the centraliser of locally compact group extensions of ergodic probability preserving transformations. New methods establishing ergodicity of group extensions are introduced, and new examples of squashable and non-coalescent group extensions are constructed. Smooth versions of some of the constructions are also given.
Original uncut version of "A cut salad of cocycles", Fund. Math. 157, (1998) 99-119