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Measures of maximal entropy on subsystems of topological suspension semiflows

Volume 260 / 2021

Tamara Kucherenko, Daniel J. Thompson Studia Mathematica 260 (2021), 229-240 MSC: 37D35, 37A35. DOI: 10.4064/sm201105-13-1 Published online: 9 March 2021


Given a compact topological dynamical system $(X, f)$ with positive entropy and upper semicontinuous entropy map, and any closed invariant subset $Y \subset X$ with positive entropy, we show that there exists a continuous roof function such that the set of measures of maximal entropy for the suspension semiflow over $(X,f)$ consists precisely of the lifts of measures which maximize entropy on $Y$. This result has a number of implications for the possible size of the set of measures of maximal entropy for topological suspension flows. In particular, for a suspension flow on the full shift on a finite alphabet, the set of ergodic measures of maximal entropy may be countable, uncountable, or have any finite cardinality.


  • Tamara KucherenkoDepartment of Mathematics
    The City College of New York
    New York, NY 10031, U.S.A.
  • Daniel J. ThompsonDepartment of Mathematics
    Ohio State University
    Columbus, OH 43210, U.S.A.

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