Improved geodesics for the reduced curvature-dimension condition in branching metric spaces

Rajala Tapio

year: 2013
journal: Discrete Contin. Dyn. Syst.
abstract: In this note we show that in metric measure spaces satisfying the reduced curvature-dimension condition $CD^*(K,N)$ we always have geodesics in the Wasserstein space of probability measures that satisfy the critical convexity inequality of $CD^*(K,N)$ also for intermediate times and in addition the measures along these geodesics have an upper-bound on their densities. This upper-bound depends on the bounds for the densities of the end-point measures, the lower-bound K for the Ricci-curvature, the upper-bound N for the dimension, and on the diameter of the union of the supports of the end-point measures.

The paper is available on the cvgmt preprint server.