-
Multi-marginal optimal transport on Riemannian manifolds
- American Journal of Mathematics
- Johns Hopkins University Press
- Volume 137, Number 4, August 2015
- pp. 1045-1060
- 10.1353/ajm.2015.0024
- Article
- Additional Information
- Purchase/rental options available:
We study a multi-marginal optimal transportation problem on a Riemannian manifold, with cost function given by the
average distance squared from multiple points to their barycenter. Under a standard regularity condition on the first
marginal, we prove that the optimal measure is unique and concentrated on the graph of a function over the first
variable, thus inducing a Monge solution. This result generalizes McCann's polar factorization theorem on manifolds
from two to several marginals, in the same sense that a well-known result of Gangbo and Swiech generalizes Brenier's
polar factorization theorem on ${\Bbb R}^n$.