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A variational principle for the metric mean dimension of free semigroup actions

Part of: Topological dynamics Smooth dynamical systems: general theory Dynamical systems with hyperbolic behavior Special properties

Published online by Cambridge University Press:  01 February 2021

MARIA CARVALHO Open the ORCID record for MARIA CARVALHO [Opens in a new window] ,
FAGNER B. RODRIGUES Open the ORCID record for FAGNER B. RODRIGUES [Opens in a new window]  and
PAULO VARANDAS
MARIA CARVALHO
Affiliation:
CMUP & Departamento de Matemática, Universidade do Porto, Porto, Portugal (e-mail: mpcarval@fc.up.pt)
FAGNER B. RODRIGUES*
Affiliation:
Departamento de Matemática, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
PAULO VARANDAS
Affiliation:
CMUP & Departamento de Matemática e Estatística, Universidade Federal da Bahia, Bahia, Brazil (e-mail: paulo.varandas@ufba.br)
*
e-mail: fagnerbernardini@gmail.com
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Abstract

We consider continuous free semigroup actions generated by a family $(g_y)_{y \,\in \, Y}$ of continuous endomorphisms of a compact metric space $(X,d)$, subject to a random walk $\mathbb P_\nu =\nu ^{\mathbb N}$ defined on a shift space $Y^{\mathbb N}$, where $(Y, d_Y)$ is a compact metric space with finite upper box dimension and $\nu $ is a Borel probability measure on Y. With the aim of elucidating the impact of the random walk on the metric mean dimension, we prove a variational principle which relates the metric mean dimension of the semigroup action with the corresponding notions for the associated skew product and the shift map $\sigma $ on $Y^{\mathbb {N}}$, and compare them with the upper box dimension of Y. In particular, we obtain exact formulas whenever $\nu $ is homogeneous and has full support. We also discuss several examples to enlighten the roles of the homogeneity, of the support and of the upper box dimension of the measure $\nu $, and to test the scope of our results.

Keywords

free semigroup actionhomogeneous measuremetric mean dimensionskew productupper box dimension

MSC classification

Primary: 37B05: Transformations and group actions with special properties (minimality, distality, proximality, etc.) 37C45: Dimension theory of dynamical systems 54F45: Dimension theory
Secondary: 37C85: Dynamics of group actions other than ${bf Z}$ and ${bf R}$, and foliations 37D35: Thermodynamic formalism, variational principles, equilibrium states 37B40: Topological entropy

Information

Type
Original Article
Information
Ergodic Theory and Dynamical Systems , Volume 42 , Issue 1 , January 2022 , pp. 65 - 85
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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