Brushing the hairs of transcendental entire functions

Details Brushing the hairs of transcendental entire functions Brushing the hairs of transcendental entire functions

2011-01-21

arxiv.org/abs/1101.4209v2

Mathematics

Dynamical Systems

19 pages. V2: Small number of minor corrections made from V1

Scientific paper

Let f be a hyperbolic transcendental entire function of finite order in the Eremenko-Lyubich class (or a finite composition of such maps), and suppose that f has a unique Fatou component. We show that the Julia set of $f$ is a Cantor bouquet; i.e. is ambiently homeomorphic to a straight brush in the sense of Aarts and Oversteegen. In particular, we show that any two such Julia sets are ambiently homeomorphic. We also show that if $f\in\B$ has finite order (or is a finite composition of such maps), but is not necessarily hyperbolic, then the Julia set of f contains a Cantor bouquet. As part of our proof, we describe, for an arbitrary function $f\in\B$, a natural compactification of the dynamical plane by adding a "circle of addresses" at infinity.

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