September  2008, 22(3): 541-556. doi: 10.3934/dcds.2008.22.541

Sub-actions for young towers

1. 

University of Houston, Houston, TX 77204-3008, United States

Received  July 2007 Revised  April 2008 Published  August 2008

Let $T:X\to X$ be a dynamical system, and $\phi: X\to \mathbb{R}$ a function on $X$. A function $\theta:X\to \mathbb{R}$ is called a sub-action if $\theta$ satisfies the equation

$\phi \leq \theta \circ T - \theta + m(\phi, T)$

where $m(\phi, T)=$sup{$\int \phi d\mu:\mu$ is an invariant probability measure for $ T$}. The existence and regularity of sub-actions are important for the study of optimizing measures. We prove the existence of Hölder sub-actions for Lipschitz functions on certain classes of Manneville-Pomeau type maps. We also construct locally Hölder sub-actions for Lipschitz functions on Young Towers. In some settings (uniform hyperbolicity and Manneville-Pomeau maps) this implies Hölder sub-actions for the underlying system modeled by the Tower.

Citation: Sheena D. Branton. Sub-actions for young towers. Discrete & Continuous Dynamical Systems, 2008, 22 (3) : 541-556. doi: 10.3934/dcds.2008.22.541
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