Teichmüller and lamination spaces with pinnings

Abstract

We describe the spaces of the positive and tropical points of the moduli space ${\mathcal{P}}_{PG{L}_2,\Sigma }$ introduced by Goncharov--Shen [GS19] as certain Teichmüller and lamination spaces, respectively, with additional data of pinnings. In the case where the surface $\Sigma$ has no punctures, we obtain the formulae relating various functions on the Teichmüller space with pinnings: $\lambda$-lengths, cross ratio coordinates, and Wilson lines. A topological description of the tropicalized amalgamation map is given in terms of $\mathcal{P}$-laminations. Based on our topological study of these "$\mathcal{P}$-type" spaces, we investigate the compatibility of the Fock--Goncharov duality maps ${\mathbb{I}}_{\mathcal{A}}$, ${\mathbb{I}}_{\mathcal{X}}$ constructed by [FG06,FG07,MSW13,GS15] under the extended ensemble map. We also discuss the amalgamation of bracelet bases.

43 pages, 18 figures. v2: Corrected typos and citations