Generic unbounded distortion for non-Dini moduli of continuity
Generic unbounded distortion for non-Dini moduli of continuity
Let be the class of moduli of continuity, and let denote the corresponding class of expanding circle maps with modulus . A modulus is non-Dini-integrable if its Dini integral diverges. A map has unbounded distortion if its distortion constants over injectivity domains of all iterates are not uniformly bounded.
Generic unbounded-distortion conjecture. For every non-Dini-integrable , unbounded distortion is -generic in .
The preceding discussion explains that Dini-integrability guarantees bounded distortion, whereas the paper's construction of absolutely continuous invariant probability measures in the non-Dini setting does not use distortion estimates. This conjecture asks whether, despite the existence of such measures, unbounded distortion is the generic behaviour for every non-Dini-integrable modulus.
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Sources & referencesView supporting material
Primary source
Hamza Ounesli, “On the existence of invariant absolutely continuous probability measures for C^1 expanding maps of the circle”, arXiv:2302.05339 (2023).
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