On the abundance of $k$-fold semi-monotone minimal sets in bimodal circle maps

DOI10.1017/ETDS.2023.46arXiv2203.15960MaRDI QIDQ6395097

Philip Boyland

Publication date: 29 March 2022

Abstract: Inspired by a twist maps theorem of Mather we study recurrent invariant sets that are ordered like rigid rotation under the action of the lift of a bimodal circle map $g$ to the $k$-fold cover. For each irrational in the interior of the rotation set the collection of the $k$-fold ordered semi-Denjoy minimal sets with that rotation number contains a $(k-1)$-dimensional ball in the weak topology on their unique invariant measures. We also describe completely their periodic orbit analogs for rational rotation numbers. The main tool is a generalization of a construction of Hedlund and Morse which generates the symbolic analogs of these $k$-fold well-ordered invariant sets.

Mathematics Subject Classification ID

Dynamical systems involving maps of the circle (37E10) Symbolic dynamics (37B10) Rotation numbers and vectors (37E45)

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