Boundaries of hyperbolic and simply parabolic Baker domains

TL;DR

This paper investigates the boundary dynamics of certain Baker domains in transcendental maps, revealing non-ergodic behavior, boundary points with non-converging orbits, and conditions for periodic points on the boundary.

Contribution

It provides new insights into the boundary behavior of non-univalent Baker domains, including properties of the boundary map and existence of boundary periodic points.

Findings

Proves non-ergodicity and non-recurrence of boundary maps.

Identifies boundary points with orbits not converging to infinity.

Establishes conditions for the existence of boundary periodic points.

Abstract

We study the boundaries of non-univalent simply connected Baker domains of transcendental maps (both entire and meromorphic), of hyperbolic and simply parabolic type. We prove non-ergodicity and non-recurrence for the boundary map, and additional properties concerning the Julia set and the set of singularities of the associated inner function, and the topology and the dynamics on the boundary of the Baker domain. In particular, we prove the existence of points on the boundary whose orbit does not converge to infinity through the dynamical access, in the sense of Carath\'eodory. Finally, under mild conditions on the postsingular set, we prove the existence of periodic points on the boundary of such Baker domains.