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Examples of Feigenbaum Julia sets with small Hausdorff dimension

Artur Avila, Mikhail Lyubich

math.DSarXiv:math/0407066

Abstract

We give examples of infinitely renormalizable quadratic polynomials Fc: z to z2+c with stationary combinatorics whose Julia sets have Hausdorff dimension arbitrar y close to 1. The combinatorics of the renormalization involved is close to the Chebyshev one . The argument is based upon a new tool, a ``Recursive Quadratic Estimate'' for the Poincaré series of an infinitely re normalizable map.

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