Finite and infinite degree Thurston maps with extra marked points

Abstract

We investigate the family of marked Thurston maps that are defined everywhere on the topological sphere $S^2$, potentially excluding at most countable closed set of essential singularities. We show that when an unmarked Thurston map $f$ is realized by a postsingularly finite holomorphic map, the marked Thurston map $(f, A)$, where $A \subset S^2$ is the corresponding finite marked set, admits such a realization if and only if it has no degenerate Levy cycle. To obtain this result, we analyze the associated pullback map $\sigma_{f, A}$ defined on the Teichm\"uller space $\mathcal{T}_A$ and demonstrate that some of its iterates admit well-behaved invariant complex sub-manifolds within $\mathcal{T}_A$. By applying powerful machinery of one-dimensional complex dynamics and hyperbolic geometry, we gain a clear understanding of the behavior of the map $\sigma_{f, A}$ restricted to the corresponding invariant subset of the Teichm\"uller space $\mathcal{T}_A$.