Handlebodies of Infinite Genus and Schottky Groups

Ara Basmajian; Katsuhiko Matsuzaki

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arXiv · 2508.17091

Handlebodies of Infinite Genus and Schottky Groups

Ara Basmajian·Katsuhiko Matsuzaki

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Abstract

In this paper, we begin an investigation of infinite genus handlebodies, infinitely generated Schottky groups, and related uniformization questions by giving appropriate definitions for them. There are uncountably many topological types of infinite genus surfaces with non-planar ends. We show that any such surface and any infinite genus handlebody can be topologically uniformized by an infinitely generated classical Schottky group. We next show that an infinite genus Riemann surface with non-planar ends admitting a bounded pants decomposition can be quasiconformally uniformized by a classical Schottky group. In addition, the conformal equivalence class of such a uniformization is unique.If the assumption of bounded pants decomposition is removed we supply examples of such Riemann surfaces that do not admit a quasiconformal uniformization by a Schottky group.

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Ara Basmajian, Katsuhiko Matsuzaki. 2025-08-23. Handlebodies of Infinite Genus and Schottky Groups. https://arxiv.org/abs/2508.17091

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