On type-preserving representations of the four-punctured sphere group

Abstract

We give counterexamples to a question of Bowditch that if a non-elementary type-preserving representation $\rho :{\pi }_1({\Sigma }_{g,n})\to PSL(2;\mathbb{R})$ of a punctured surface group sends every non-peripheral simple closed curve to a hyperbolic element, then must $\rho$ be Fuchsian. The counterexamples come from relative Euler class $\pm 1$ representations of the four-punctured sphere group. We also show that the mapping class group action on each non-extremal component of the character space of type-preserving representations of the four-punctured sphere group is ergodic, which confirms a conjecture of Goldman for this case. The main tool we use is Kashaev-Penner's lengths coordinates of the decorated character spaces.

26 pages, 11 figures

References in corpus (2)

• Quantum traces for representations of surface groups in SL_2
• The modular action on PSL(2,R)-characters in genus 2