Absolute continuity, Lyapunov exponents and rigidity I: geodesic flows
Artur Avila, Marcelo Viana, Amie Wilkinson (2015)
Journal of the European Mathematical Society
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We consider volume-preserving perturbations of the time-one map of the geodesic flow of a compact surface with negative curvature. We show that if the Liouville measure has Lebesgue disintegration along the center foliation then the perturbation is itself the time-one map of a smooth volume-preserving flow, and that otherwise the disintegration is necessarily atomic.