S-unimodal Misiurewicz maps with flat critical points

Tom 181 / 2004

Roland Zweimüller Fundamenta Mathematicae 181 (2004), 1-25 MSC: Primary 28D05, 37A25; Secondary 37A40, 37E05, 60F05. DOI: 10.4064/fm181-1-1


We consider S-unimodal Misiurewicz maps $T$ with a flat critical point $c$ and show that they exhibit ergodic properties analogous to those of interval maps with indifferent fixed (or periodic) points. Specifically, there is a conservative ergodic absolutely continuous $\sigma$-finite invariant measure $\mu$, exact up to finite rotations, and in the infinite measure case the system is pointwise dual ergodic with many uniform and Darling–Kac sets. Determining the order of return distributions to suitable reference sets we obtain bounds on the decay of correlations and on wandering rates. Assuming some control of the local behaviour of $T$ at $c$, we show that in most cases, e.g. whenever the postcritical orbit has a Lyapunov exponent, the tail of the return distribution is in fact regularly varying, which implies various distributional limit theorems.


  • Roland ZweimüllerMathematics Department
    Imperial College London
    180 Queen's Gate
    London SW7 2AL, UK

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