# Existence and Uniqueness of optimal transport map

created by cavallett on 08 Jan 2013
modified on 25 Aug 2014

[BibTeX]

Accepted Paper

Inserted: 8 jan 2013
Last Updated: 25 aug 2014

Journal: Ann. Inst. H. Poincaré Anal. Non Linéaire
Year: 2013

Abstract:

Let $(X,d,m)$ be a proper, non-branching, metric measure space. We show existence and uniqueness of optimal transport maps for cost written as non-decreasing and strictly convex functions of the distance, provided $(X,d,m)$ satisfies a new weak property concerning the behavior of $m$ under the shrinking of sets to points, see Assumption 1. This in particular covers spaces satisfying the measure contraction property.

We also prove a stability property for Assumption 1: If $(X,d,m)$ satisfies Assumption 1 and $\tilde m = g\cdot m$, for some continuous function $g >0$, then also $(X,d,\tilde m)$ verifies Assumption 1. Since these changes in the reference measures do not preserve any Ricci type curvature bounds, this shows that our condition is strictly weaker than measure contraction property.