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arXiv · 2611.08944

Centralizers of elliptic univalent self-maps and the embeddability problem in the unit disc

Akira Mino
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Abstract

Let $ϕ$ be an elliptic univalent self-map of the unit disc in the complex plane that is not an automorphism, with multiplier $0<|λ|<1$ at its Denjoy--Wolff point. The simultaneous Schröder linearization of maps commuting with $ϕ$ is classical. Using this linearization, we identify its univalent centralizer with the multiplicative semigroup of scalars that preserve the Koenigs domain, and investigate how the geometry of this semigroup controls continuous-time embeddings. We show that the identity is a non-isolated point of the centralizer precisely when the centralizer contains a non-trivial continuous one-parameter semigroup; such a semigroup need not contain $ϕ$. For each logarithmic branch $μ_k=-\mathrm{Log}λ+2πi k$, we establish a local sector alternative that characterizes the existence of an embedding with spectral value $μ_k$. We prove that the set of admissible branch indices is either empty, a finite interval of integers, or all of $\mathbb{Z}$, and give examples realizing all three possibilities. Finally, we describe the full holomorphic centralizer, including the constant map with value equal to the Denjoy--Wolff point.

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Akira Mino. 2026-11-06. Centralizers of elliptic univalent self-maps and the embeddability problem in the unit disc. https://arxiv.org/abs/2611.08944

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