Scientific Calendar Event



Description
Register in advance for this meeting:
https://zoom.us/meeting/register/tJYvceqgrzwoEtGEJz4QAVNm8wHkZ82UfFEI
After registering, you will receive a confirmation email containing
information about joining the meeting.

Abstract: An example due to A. Katok and also J. Yorke which appears in a note written by J. Milnor (Fubini foiled: Katok paradoxical example in measure theory) reveals a "pathological" behavior of a foliation by analytics leaves in the unit square: There exists a Lebesgue full measure subset intersecting each leaf at most one point. In other words, Lebesgue measure disintegrates into Dirac masses. Shub and Wilkinson found the same phenomenon for the center foliation of some partially hyperbolic dynamics with one-dimensional center and non-zero center exponent. Pesin and Hirayama studied a higher dimensional version with compact center bundle and positive sum of center exponents. In all of the above conclusions, the center leaves are compact and there is no room for expansion. In joint work with J. Zhang we prove that for derived from Anosov diffemorphisms (non-compact center leaves) any ergodic measure with zero center Lyapunov exponent disintegrates into Dirac measures.
Go to day