Strangely dispersed minimal sets in the quasiperiodically forced Arnold map

Details Strangely dispersed minimal sets in the quasiperiodically forced Arnold map Strangely dispersed minimal sets in the quasiperiodically forced Arnold map

2008-07-29

arxiv.org/abs/0807.4707v1

Mathematics

Dynamical Systems

21 pages, 10 figures

Scientific paper

10.1088/0951-7715/22/4/008

We study quasiperiodically forced circle endomorphisms, homotopic to the identity, and show that under suitable conditions these exhibit uncountably many minimal sets with a complicated structure, to which we refer to as `strangely dispersed'. Along the way, we generalise some well-known results about circle endomorphisms to the uniquely ergodically forced case. Namely, all rotation numbers in the rotation interval of a uniquely ergodically forced circle endomorphism are realised on minimal sets, and if the rotation interval has non-empty interior then the topological entropy is strictly positive. The results apply in particular to the quasiperiodically forced Arnold circle map, which serves as a paradigm example.

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