Bakry–Émery curvature-dimension condition and Riemannian Ricci curvature bounds

The aim of the present paper is to bridge the gap between the Bakry–Émery and the Lott–Sturm–Villani approaches to provide synthetic and abstract notions of lower Ricci curvature bounds.

We start from a strongly local Dirichlet form E admitting a Carré du champ Γ in a Polish measure space (X,) and a canonical distance that induces the original topology of X. We first characterize the distinguished class of Riemannian Energy measure spaces, where E coincides with the Cheeger energy induced by and where every function f with Γ(f)≤1 admits a continuous representative.

In such a class, we show that if E satisfies a suitable weak form of the Bakry–Émery curvature dimension condition BE(K,∞) then the metric measure space (X,,) satisfies the Riemannian Ricci curvature bound RCD(K,∞) according to [Duke Math. J. 163 (2014) 1405–1490], thus showing the equivalence of the two notions.

Two applications are then proved: the tensorization property for Riemannian Energy spaces satisfying the Bakry–Émery BE(K,N) condition (and thus the corresponding one for RCD(K,∞) spaces without assuming nonbranching) and the stability of BE(K,N) with respect to Sturm–Gromov–Hausdorff convergence.