Measure rigidity beyond uniform hyperbolicity: invariant measures for cartan actions on tori

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January 2007, 1(1): 123-146. doi: 10.3934/jmd.2007.1.123

Measure rigidity beyond uniform hyperbolicity: invariant measures for cartan actions on tori

1.	Department of Mathematics, University of South Alabama, Mobile, AL 36688, United States
2.	Department of Mathematics, The Pennsylvania State University, University Park, PA 16802, United States

Received March 2006 Published October 2006

Abstract
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We prove that every smooth action $\a$ of $\mathbb{Z}^k,k\ge 2$, on the $(k+1)$-dimensional torus whose elements are homotopic to corresponding elements of an action $\a_0$ by hyperbolic linear maps preserves an absolutely continuous measure. This is the first known result concerning abelian groups of diffeomorphisms where existence of an invariant geometric structure is obtained from homotopy data.
We also show that both ergodic and geometric properties of such a measure are very close to the corresponding properties of the Lebesgue measure with respect to the linear action $\a_0$.

Keywords: $\mathbb{Z}^k$ actions., measure rigidity, nonuniform hyperbolicity.

Mathematics Subject Classification: Primary: 37C40,37D25, 37C8.

Citation: Boris Kalinin, Anatole Katok. Measure rigidity beyond uniform hyperbolicity: invariant measures for cartan actions on tori. Journal of Modern Dynamics, 2007, 1 (1) : 123-146. doi: 10.3934/jmd.2007.1.123

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