Krzysztof Fraczek
Title: Ergodic properties of infinite measure-preserving extensions of area-preserving flows

Abstract: I will present some methods for proving ergodicity of skew product extensions of interval exchange transformations of periodic type. I will also deal with a class of smooth flows on non-compact manifolds which are extensions of so called multivalued Hamiltionian flows on compact surfaces of higher genus. My talk is based on two papers joint with J.-P. Conze and C. Ulcigrai.