Evolution variational inequality and Wasserstein control in variable curvature context

Abstract

In this note we continue the analysis of metric measure space with variable ricci curvature bounds. First, we study $(\kappa ,N)$-convex functions on metric spaces where $\kappa$ is a lower semi-continuous function, and gradient flow curves in the sense of a new evolution variational inequality that captures the information that is provided by $\kappa$. Then, in the spirit of previous work by Erbar, Kuwada and Sturm \cite{erbarkuwadasturm} we introduce an entropic curvature-dimension condition $C{D}^e(\kappa ,N)$ for metric measure spaces and lower semi-continuous $\kappa$. This condition is stable with respect to Gromov convergence and we show that is equivalent to the reduced curvature-dimension condition $C{D}^{\ast }(\kappa ,N)$ provided the space is non-branching. Finally, we introduce a Riemannian curvature-dimension condition in terms of an evolution variational inequality on the Wasserstein space. A consequence is a new differential Wasserstein contraction estimate.

the compactness assumption in Theorem 5.7 has been replaced by a lower bound for the curvature function, additional properties on distortion coefficients and their derivatives, comments are welcome

References in corpus (1)

• Riemannian Ricci curvature lower bounds in metric measure spaces with $\sigma$-finite measure