A Jacobian inequality for gradient maps on the sphere and its application to directional statistics
arXiv:0906.0874
Abstract
In the field of optimal transport theory, an optimal map is known to be a gradient map of a potential function satisfying cost-convexity. In this paper, the Jacobian determinant of a gradient map is shown to be log-concave with respect to a convex combination of the potential functions when the underlying manifold is the sphere and the cost function is the distance squared. The proof uses the non-negative cross-curvature property of the sphere recently established by Kim and McCann, and Figalli and Rifford. As an application to statistics, a new family of probability densities on the sphere is defined in terms of cost-convex functions. The log-concave property of the likelihood function follows from the inequality.
20 pages, 14 figures
References in corpus (4)
- On the regularity of maps solutions of optimal transportation problems
- Counterexamples to continuity of optimal transportation on positively curved Riemannian manifolds
- Towards the smoothness of optimal maps on Riemannian submersions and Riemannian products (of round spheres in particular)
- Continuity, curvature, and the general covariance of optimal transportation