Abstract
The punctured solenoid \({\mathcal H}\) plays the role of an initial object for the category of punctured surfaces with morphisms given by finite covers branched only over the punctures. The (decorated) Teichmüller space of \({\mathcal H}\) is introduced, studied, and found to be parametrized by certain coordinates on a fixed triangulation of \({\mathcal H}\). Furthermore, a point in the decorated Teichmüller space induces a polygonal decomposition of \({\mathcal H}\) itself giving a combinatorial description of the decorated Teichmüller space. This is used to obtain a non-trivial set of generators of the modular group of \({\mathcal H}\), and each word in these generators admits a normal form. There is furthermore a non-degenerate modular group invariant two form on the Teichmüller space of \({\mathcal H}\). All of this structure is in perfect analogy with that of the decorated Teichmüller space of a punctured surface of finite type.
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Dedicated to the memory of Subhashis Nag.
Dragomir Šarić was partially supported by NSF grant DMS 0505652.
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Penner, R.C., Šarić, D. Teichmüller theory of the punctured solenoid. Geom Dedicata 132, 179–212 (2008). https://doi.org/10.1007/s10711-007-9226-9
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DOI: https://doi.org/10.1007/s10711-007-9226-9