Geometriae Dedicata

, Volume 152, Issue 1, pp 85–128

Hyperbolic cone-manifold structures with prescribed holonomy I: punctured tori

Original Paper

DOI: 10.1007/s10711-010-9547-y

Cite this article as:
Mathews, D.V. Geom Dedicata (2011) 152: 85. doi:10.1007/s10711-010-9547-y


We consider the relationship between hyperbolic cone-manifold structures on surfaces, and algebraic representations of the fundamental group into a group of isometries. A hyperbolic cone-manifold structure on a surface, with all interior cone angles being integer multiples of 2π, determines a holonomy representation of the fundamental group. We ask, conversely, when a representation of the fundamental group is the holonomy of a hyperbolic cone-manifold structure. In this paper we prove results for the punctured torus; in the sequel, for higher genus surfaces. We show that a representation of the fundamental group of a punctured torus is a holonomy representation of a hyperbolic cone-manifold structure with no interior cone points and a single corner point if and only if it is not virtually abelian. We construct a pentagonal fundamental domain for hyperbolic structures, from the geometry of a representation. Our techniques involve the universal covering group \({\widetilde{{\it PSL}_2{\mathbb R}}}\) of the group of orientation-preserving isometries of \({{\mathbb H}^2}\) and Markoff moves arising from the action of the mapping class group on the character variety.


Hyperbolic Cone-manifold Holonomy 

Mathematics Subject Classification (2000)


Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  1. 1.Département de mathématiquesUniversité de NantesNantes Cedex 3France

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