The Torelli Group and Euler Class Zero $\mathrm{PSL}(2,\mathbb{R})$ Representations

We prove that every representation of a closed surface group of genus at least $3$ into $\mathrm{PSL}(2,\mathbb{R})$ that is sufficiently close (but not equal to) a representation that has non-compact solvable image has a simple closed separating curve that is mapped to a non-trivial elliptic element in $\mathrm{PSL}(2,\mathbb{R})$. This can be seen as evidence for an affirmative answer to a question of Bowditch and a conjecture of Goldman.

Authors

Publication Details

Journal
arXiv (Cornell University)
Published
2026-10-29
DOI
https://doi.org/10.48550/arxiv.2610.40040
Primary Topic
Geometric and Algebraic Topology
Type
preprint
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preprint

The Torelli Group and Euler Class Zero $\mathrm{PSL}(2,\mathbb{R})$ Representations

Peter Smillie, James Farre, Marit Bobb
arXiv (Cornell University)
Geometric and Algebraic Topology
preprint

The Torelli Group and Euler Class Zero $\mathrm{PSL}(2,\mathbb{R})$ Representations

Peter Smillie, James Farre, Marit Bobb
preprint en

Abstract

We prove that every representation of a closed surface group of genus at least $3$ into $\mathrm{PSL}(2,\mathbb{R})$ that is sufficiently close (but not equal to) a representation that has non-compact solvable image has a simple closed separating curve that is mapped to a non-trivial elliptic element in $\mathrm{PSL}(2,\mathbb{R})$. This can be seen as evidence for an affirmative answer to a question of Bowditch and a conjecture of Goldman.

arXiv (Cornell University)
Geometric and Algebraic Topology
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The Torelli Group and Euler Class Zero $\mathrm{PSL}(2,\mathbb{R})$ Representations — Peter Smillie, James Farre, et al. · arXiv (Cornell University) (2026) | TGRS Research Map | TGRS