A Schlafli-type formula for convex cores of hyperbolic 3-manifolds

Details A Schlafli-type formula for convex cores of hyperbolic 3-manifolds A Schlafli-type formula for convex cores of hyperbolic 3-manifolds

1997-04-30

arxiv.org/abs/dg-ga/9704017v1

Mathematics

Differential Geometry

18 pages, 3 pictures, AmsTeX

Scientific paper

In 3-dimensional hyperbolic geometry, the classical Schlafli formula expresses the variation of the volume of a hyperbolic polyhedron in terms of the length of its edges and of the variation of its dihedral angles. We prove a similar formula for the variation of the volume of the convex core of a geometrically finite hyperbolic 3--manifold M, as we vary the hyperbolic metric of M. In this case, the pleating locus of the boundary of the convex core is not constant any more, but we showed in an earlier paper that the variation of the bending of the boundary of the convex core is described by a geodesic lamination with a certain transverse distribution. We prove that the variation of the volume of the convex core is then equal to 1/2 the length of this transverse distribution.

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