Locally connected models for Julia sets

Details Locally connected models for Julia sets Locally connected models for Julia sets

2008-09-22

arxiv.org/abs/0809.3754v2

Advances in Mathematics, 226 (2011), 1621-1661

Mathematics

Dynamical Systems

54 pages, 1 diagram, 3 figures; the new version amends some of the proofs

Scientific paper

Let $P$ be a polynomial with a connected Julia set $J$. We use continuum theory to show that it admits a \emph{finest monotone map $\ph$ onto a locally connected continuum $J_{\sim_P}$}, i.e. a monotone map $\ph:J\to J_{\sim_P}$ such that for any other monotone map $\psi:J\to J'$ there exists a monotone map $h$ with $\psi=h\circ \ph$. Then we extend $\ph$ onto the complex plane $\C$ (keeping the same notation) and show that $\ph$ monotonically semiconjugates $P|_{\C}$ to a \emph{topological polynomial $g:\C\to \C$}. If $P$ does not have Siegel or Cremer periodic points this gives an alternative proof of Kiwi's fundamental results on locally connected models of dynamics on the Julia sets, but the results hold for all polynomials with connected Julia sets. We also give a criterion and a useful sufficient condition for the map $\ph$ not to collapse $J$ into a point.

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