English

Geometrically finite transcendental entire functions

Dynamical Systems 2024-12-10 v3 Complex Variables

Abstract

For polynomials, local connectivity of Julia sets is a much-studied and important property. Indeed, when the Julia set of a polynomial of degree d2d\geq 2 is locally connected, the topological dynamics can be completely described as a quotient of a much simpler system: angle dd-tupling on the circle. For a transcendental entire function, local connectivity is less significant, but we may still ask for a description of the topological dynamics as the quotient of a simpler system. To this end, we introduce the notion of "docile" functions: a transcendental entire function with bounded postsingular set is docile if it is the quotient of a suitable disjoint-type function. Moreover, we prove docility for the large class of geometrically finite transcendental entire functions with bounded criticality on the Julia set. This can be seen as an analogue of the local connectivity of Julia sets for geometrically finite polynomials, first proved by Douady and Hubbard, and extends previous work of the second author and of Mihaljevi\'c for more restrictive classes of entire functions.

Keywords

Cite

@article{arxiv.2003.08884,
  title  = {Geometrically finite transcendental entire functions},
  author = {Mashael Alhamed and Lasse Rempe and Dave Sixsmith},
  journal= {arXiv preprint arXiv:2003.08884},
  year   = {2024}
}

Comments

41 pages, 3 figures. V3: Some expositional changes and clarifications in the proof of Proposition 7.1

R2 v1 2026-06-23T14:20:26.647Z