# Ergodic Theory of Equivariant Diffeomorphisms (Memoirs of the American Mathematical Society Series #803): Markov Partitions and Stable Ergodicity

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Brand new. We distribute directly for the publisher. We obtain stability and structural results for equivariant diffeomorphisms which are hyperbolic transverse to a compact ... (connected or finite) Lie group action and construct `$\Gamma$-regular' Markov partitions which give symbolic dynamics on the orbit space. We apply these results to the situation where $\Gamma$ is a compact connected Lie group acting smoothly on $M$ and $F$ is a smooth (at least $C^2$) $\Gamma$-equivariant diffeomorphism of $M$ such that the restriction of $F$ to the $\Gamma$- and $F$-invariant set $\Lambda\subset M$ is partially hyperbolic with center foliation given by $\Gamma$-orbits. On the assumption that the $\Gamma$-orbits all have dimension equal to that of $\Gamma$, we show that there is a naturally defined $F$- and $\Gamma$-invariant measure $\nu$ of maximal entropy on $\Lambda$ (it is not assumed that the action of $\Gamma$ is free). In this setting we prove a version of the Livic regularity theorem and extend results of Brin on the structure of the ergodic components of compact group extensions of Anosov diffeomorphisms. We show as our main result that generically $(F,\Lambda,\nu)$ is stably ergodic (openness in the $C^2$-topology). In the case when $\Lambda$ is an attractor, we show that $\Lambda$ is generically a stably SRB attractor within the class of $\Gamma$-equivariant diffeomorphisms of $M$. Read more Show Less

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### Overview

We obtain stability and structural results for equivariant diffeomorphisms which are hyperbolic transverse to a compact (connected or finite) Lie group action and construct '$\Gamma$-regular' Markov partitions which give symbolic dynamics on the orbit space. We apply these results to the situation where $\Gamma$ is a compact connected Lie group acting smoothly on $M$ and $F$ is a smooth (at least $C^2$) $\Gamma$-equivariant diffeomorphism of $M$ such that the restriction of $F$ to the $\Gamma$- and $F$-invariant set $\Lambda\subset M$ is partially hyperbolic with center foliation given by $\Gamma$-orbits. On the assumption that the $\Gamma$-orbits all have dimension equal to that of $\Gamma$, we show that there is a naturally defined $F$- and $\Gamma$-invariant measure $\nu$ of maximal entropy on $\Lambda$ (it is not assumed that the action of $\Gamma$ is free). In this setting we prove a version of the Livsic regularity theorem and extend results of Brin on the structure of the ergodic components of compact group extensions of Anosov diffeomorphisms. We show as our main result that generically $(F,\Lambda,\nu)$ is stably ergodic (openness in the $C^2$-topology). In the case when $\Lambda$ is an attractor, we show that $\Lambda$ is generically a stably SRB attractor within the class of $\Gamma$-equivariant diffeomorphisms of $M$.

Read More Show Less

### Product Details

• ISBN-13: 9780821835999
• Publisher: American Mathematical Society
• Publication date: 3/19/2004
• Series: Memoirs of the American Mathematical Soc , #803
• Edition description: 4 of 4 Numbers, May 2004 Edition
• Pages: 100
• Product dimensions: 6.98 (w) x 10.00 (h) x 0.24 (d)

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