2022/10/12 by Fletcher, Alastair N., Stoertz, Daniel, Vellis, Vyron
#37F10 (Secondary) #54C50 (Primary) 30C65 #Dynamical Systems (math.DS) #FOS: Mathematics #General Topology (math.GN)
paper · doi:10.48550/arxiv.2210.06619
The primary aim of this paper is to give topological obstructions to Cantor sets in ℝ3 being Julia sets of uniformly quasiregular mappings. Our main tool is the genus of a Cantor set. We give a new construction of a genus g Cantor set, the first for which the local genus is g at every point, and then show that this Cantor set can be realized as the Julia set of a uniformly quasiregular mapping. These are the first such Cantor Julia sets constructed for g≥ 3. We then turn to our dynamical applications and show that every Cantor Julia set of a hyperbolic uniformly quasiregular map has a finite genus g; that a given local genus in a Cantor Julia set must occur on a dense subset of the Julia set; and that there do exist Cantor Julia sets where the local genus is non-constant.