The dual Bonahon-Schläfli formula

Abstract

Given a differentiable deformation of geometrically finite hyperbolic $3$-manifolds $(M_t{)}_t$, the Bonahon-Schläfli formula expresses the derivative of the volume of the convex cores $(C{M}_t{)}_t$ in terms of the variation of the geometry of its boundary, as the classical Schläfli formula does for the volume of hyperbolic polyhedra. Here we study the analogous problem for the dual volume, a notion that arises from the polarity relation between the hyperbolic space ${\mathbb{H}}^3$ and the de Sitter space ${\mathrm{dS}}^3$. The corresponding dual Bonahon-Schläfli formula has been originally deduced from Bonahon's work by Krasnov and Schlenker. Here, making use of the differential Schläfli formula and the properties of the dual volume, we give a (almost) self-contained proof of the dual Bonahon-Schläfli formula, without making use of Bonahon's original result.

arXiv comment25 pages, 1 figure

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Cited by in corpus (3)

• The dual volume of quasi-Fuchsian manifolds and the Weil-Petersson distance
• Constant Gaussian curvature foliations and Schläfli formulas of hyperbolic $3$-manifolds
• The infimum of the dual volume of convex co-compact hyperbolic $3$-manifolds