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Regularity of calibrated sub-actions for circle expanding maps and Sturmian optimization
Published online by Cambridge University Press: 27 April 2022
Abstract
In this short and elementary note, we study some ergodic optimization problems for circle expanding maps. We first make an observation that if a function is not far from being convex, then its calibrated sub-actions are closer to convex functions in a certain effective way. As an application of this simple observation, for a circle doubling map, we generalize a result of Bousch saying that translations of the cosine function are uniquely optimized by Sturmian measures. Our argument follows the mainline of Bousch’s original proof, while some technical part is simplified by the observation mentioned above, and no numerical calculation is needed.
MSC classification
Secondary:
37E10: Maps of the circle
- Type
- Original Article
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- Copyright
- © The Author(s), 2022. Published by Cambridge University Press
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