Induced expansion for quadratic polynomials

Details Induced expansion for quadratic polynomials Induced expansion for quadratic polynomials

1993-08-07

arxiv.org/abs/math/9308223v1

Mathematics

Dynamical Systems

Scientific paper

We prove that non-hyperbolic non-renormalizable quadratic polynomials are expansion inducing. For renormalizable polynomials a counterpart of this statement is that in the case of unbounded combinatorics renormalized mappings become almost quadratic. Technically, this follows from the decay of the box geometry. Specific estimates of the rate of this decay are shown which are sharp in a class of S-unimodal mappings combinatorially related to rotations of bounded type. We use real methods based on cross-ratios and Schwarzian derivative complemented by complex-analytic estimates in terms of conformal moduli.

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