Generic unbounded distortion for non-Dini moduli of continuity

From papers

Let KK be the class of moduli of continuity, and let Γω1(S1)\Gamma_{\omega}^{1}(\mathbb S^1) denote the corresponding class of C1C^1 expanding circle maps with modulus ω\omega. A modulus ω\omega 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 ωK\omega\in K, unbounded distortion is C1C^1-generic in Γω1(S1)\Gamma_{\omega}^{1}(\mathbb S^1).

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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