Hyperbolic cusps with convex polyhedral boundary

Details Hyperbolic cusps with convex polyhedral boundary Hyperbolic cusps with convex polyhedral boundary

2007-08-20

arxiv.org/abs/0708.2666v1

Mathematics

Differential Geometry

Scientific paper

We prove that a 3-dimensional hyperbolic cusp with convex polyhedral boundary is uniquely determined by the metric induced on its boundary. Furthemore, any hyperbolic metric on the torus with cone singularities of positive curvature can be realized as the induced metric on the boundary of a convex polyhedral cusp. The proof uses the total scalar curvature functional on the space of ``cusps with particles'', which are hyperbolic cone-manifolds with the singular locus a union of half-lines. We prove, in addition, that convex polyhedral cusps with particles are rigid with respect to the induced metric on the boundary and the curvatures of the singular locus. Our main theorem is equivalent to a part of a general statement about isometric immersions of compact surfaces.

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