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arXiv · 0906.0874

A Jacobian inequality for gradient maps on the sphere and its application to directional statistics

Tomonari Sei
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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.

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Tomonari Sei. 2010-02-08. A Jacobian inequality for gradient maps on the sphere and its application to directional statistics. https://arxiv.org/abs/0906.0874

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