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On intrinsic ergodicity of factors of $\mathbb{Z}^{d}$ subshifts

Published online by Cambridge University Press:  06 October 2015

KEVIN MCGOFF  and
RONNIE PAVLOV
KEVIN MCGOFF
Affiliation:
Department of Mathematics, Duke University, Durham, NC 27708-0320, USA email [email protected]
RONNIE PAVLOV
Affiliation:
Department of Mathematics, University of Denver, 2280 S. Vine Street, Denver, CO 80208, USA email [email protected]
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Abstract

It is well known that any $\mathbb{Z}$ subshift with the specification property has the property that every factor is intrinsically ergodic, i.e. every factor has a unique factor of maximal entropy. In recent work, other $\mathbb{Z}$ subshifts have been shown to possess this property as well, including $\unicode[STIX]{x1D6FD}$-shifts and a class of $S$-gap shifts. We give two results that show that the situation for $\mathbb{Z}^{d}$ subshifts with $d>1$ is quite different. First, for any $d>1$, we show that any $\mathbb{Z}^{d}$ subshift possessing a certain mixing property must have a factor with positive entropy which is not intrinsically ergodic. In particular, this shows that for $d>1$, $\mathbb{Z}^{d}$ subshifts with specification cannot have all factors intrinsically ergodic. We also give an example of a $\mathbb{Z}^{2}$ shift of finite type, introduced by Hochman, which is not even topologically mixing, but for which every positive-entropy subshift factor is intrinsically ergodic.

Type
Research Article
Information
Ergodic Theory and Dynamical Systems , Volume 37 , Issue 2 , April 2017 , pp. 621 - 645
Copyright
© Cambridge University Press, 2015 

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