Invariant and stationary measures for the SL(2,R) action on Moduli space

Abstract

We prove some ergodic-theoretic rigidity properties of the action of SL(2,R) on moduli space. In particular, we show that any ergodic measure invariant under the action of the upper triangular subgroup of SL(2,R) is supported on an invariant affine submanifold. The main theorems are inspired by the results of several authors on unipotent flows on homogeneous spaces, and in particular by Ratner's seminal work.

214 pages, 8 figures. Final version, to appear in Publications l'IHES

References in corpus (1)

• An example of a Teichmuller disk in genus 4 with degenerate Kontsevich-Zorich spectrum

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