Characterization of tangent quasicircles and quasiannuli

Dimitrios Ntalampekos

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arXiv · 2602.17236

Characterization of tangent quasicircles and quasiannuli

Dimitrios Ntalampekos

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Abstract

We give a necessary and sufficient condition so that a pair of disjoint Jordan regions in the sphere can be quasiconformally mapped to a pair of disks. As a consequence, we obtain a simple characterization that involves Lipschitz functions for the case that one of the Jordan regions is a half-plane. We apply these results to prove that all polynomial cusps are quasiconformally equivalent and that a quasisymmetric embedding of the union of two disjoint disks extends to a quasiconformal map of the sphere, quantitatively. Also, in combination with previous work of the author, we obtain a new characterization of compact sets that are quasiconformally equivalent to Schottky sets.

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BibTeX RIS

Dimitrios Ntalampekos. 2026-02-19. Characterization of tangent quasicircles and quasiannuli. https://arxiv.org/abs/2602.17236

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