Abstract
We describe the space of maximal components of the character variety of surface group representations into and .
For every real rank Lie group of Hermitian type, we construct a mapping class group invariant complex structure on the maximal components. For the groups and , we give a mapping class group invariant parametrization of each maximal component as an explicit holomorphic fiber bundle over Teichmüller space. Special attention is put on the connected components which are singular: we give a precise local description of the singularities and their geometric interpretation. We also describe the quotient of the maximal components of and by the action of the mapping class group as a holomorphic submersion over the moduli space of curves.
These results are proven in two steps: first we use Higgs bundles to give a nonmapping class group equivariant parametrization, then we prove an analog of Labourie’s conjecture for maximal –representations.
Citation
Daniele Alessandrini. Brian Collier. "The geometry of maximal components of the $\mathsf{PSp}(4,\mathbb R)$ character variety." Geom. Topol. 23 (3) 1251 - 1337, 2019. https://doi.org/10.2140/gt.2019.23.1251
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