A new criterion of physical measures for partially hyperbolic diffeomorphisms

Hua, Yongxia; Yang, Fan; Yang, Jiagang

doi:10.1090/tran/7920

A new criterion of physical measures for partially hyperbolic diffeomorphisms
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by Yongxia Hua, Fan Yang and Jiagang Yang PDF

Trans. Amer. Math. Soc. 373 (2020), 385-417 Request permission

Abstract:

We show that, for any $C^1$ partially hyperbolic diffeomorphism, there is a full volume subset such that any Cesàro limit of any point in this subset satisfies the Pesin formula for partial entropy.

This result has several important applications. First, we show that, for any $C^{1+}$ partially hyperbolic diffeomorphism with one dimensional center, there is a full volume subset such that either every point in this set belongs to the basin of a physical measure with nonvanishing center exponent or the center exponent of any limit of the sequence $\frac 1n\sum _{i=0}^{n-1}\delta _{f^i(x)}$ is vanishing.

We also prove that, for any diffeomorphism with mostly contracting center, it admits a $C^1$-neighborhood such that every diffeomorphism in a $C^1$ residual subset of this open set admits finitely many physical measures whose basins have full volume.

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