Inserted: 24 nov 2011
Last Updated: 14 nov 2012
Journal: J. Funct. Anal.
We construct geodesics in the Wasserstein space of probability measures along which all the measures have an upper bound on their density that is determined by the densities of the endpoints of the geodesic. Using these geodesics we show that a local Poincaré inequality and the measure contraction property follow from the Ricci curvature bounds defined by Sturm. We also show for a large class of convex functionals that a local Poincaré inequality is implied by the weak displacement convexity of the functional.
Keywords: Ricci curvature, Poincare inequality, Geodesics, metric measure spaces, measure contraction property