Generalized curvature for the optimal transport problem induced by a Tonelli Lagrangian

We propose a generalized curvature that is motivated by the optimal transport problem on ${\mathbb{R}}^d$ with cost induced by a Tonelli Lagrangian $L$. We show that non-negativity of the generalized curvature implies displacement convexity of the generalized entropy functional on the $L-$Wasserstein space along $C^2$ displacement interpolants.