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A closed ball compactification of a maximal component via cores of trees

Giuseppe Martone, Charles Ouyang and Andrea Tamburelli

Algebraic & Geometric Topology 24 (2024) 3693–3717
Abstract

We show that, in the character variety of surface group representations into the Lie group PSL (2, ) × PSL (2, ), the compactification of the maximal component introduced by the second author is a closed ball upon which the mapping class group acts. We study the dynamics of this action. Finally, we describe the boundary points geometrically as ( A1×A1 ¯,2)–valued mixed structures.

Keywords
harmonic maps, hyperbolic surfaces, Teichmüller theory, $\mathbb{R}$–trees, quadratic differentials
Mathematical Subject Classification
Primary: 53C43, 57K20
References
Publication
Received: 29 May 2022
Revised: 18 August 2023
Accepted: 22 September 2023
Published: 9 December 2024
Authors
Giuseppe Martone
Department of Mathematics and Statistics
Sam Houston State University
Huntsville, TX
United States
Charles Ouyang
Department of Mathematics
Washington University
St Louis, MO
United States
Andrea Tamburelli
Department of Mathematics
University of Pisa
Pisa
Italy

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