Julia sets as buried Julia components

Wang, Youming; Yang, Fei

doi:10.1090/tran/8144

Julia sets as buried Julia components
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by Youming Wang and Fei Yang PDF

Trans. Amer. Math. Soc. 373 (2020), 7287-7326 Request permission

Abstract:

Let $f$ be a rational map with degree $d\geq 2$ whose Julia set is connected but not equal to the whole Riemann sphere. It is proved that there exists a rational map $g$ such that $g$ contains a buried Julia component on which the dynamics is quasiconformally conjugate to that of $f$ on the Julia set if and only if $f$ does not have parabolic basins and Siegel disks. If such $g$ exists, then the degree can be chosen such that $\deg (g)\leq 7d-2$. In particular, if $f$ is a polynomial, then $g$ can be chosen such that $\deg (g)\leq 4d+4$. Moreover, some quartic and cubic rational maps whose Julia sets contain buried Jordan curves are also constructed.

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