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Rigidity, universality, and hyperbolicity of renormalization for critical circle maps with non-integer exponents

Published online by Cambridge University Press:  25 September 2018

IGORS GORBOVICKIS
Affiliation:
Jacobs University Bremen, Campus Ring 1, 28759 Bremen, Germany email [email protected]
MICHAEL YAMPOLSKY
Affiliation:
University of Toronto, Mathematics Department, 40 St George Street, Toronto, Ontario, Canada, M5S2E4 email [email protected]

Abstract

We construct a renormalization operator which acts on analytic circle maps whose critical exponent $\unicode[STIX]{x1D6FC}$ is not necessarily an odd integer $2n+1$, $n\in \mathbb{N}$. When $\unicode[STIX]{x1D6FC}=2n+1$, our definition generalizes cylinder renormalization of analytic critical circle maps by Yampolsky [Hyperbolicity of renormalization of critical circle maps. Publ. Math. Inst. Hautes Études Sci.96 (2002), 1–41]. In the case when $\unicode[STIX]{x1D6FC}$ is close to an odd integer, we prove hyperbolicity of renormalization for maps of bounded type. We use it to prove universality and $C^{1+\unicode[STIX]{x1D6FC}}$-rigidity for such maps.

Type
Original Article
Copyright
© Cambridge University Press, 2018

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