Sectional Curvature for Kantorovich-Wasserstein and Hellinger-Kantorovich Geometries

We derive an explicit formula for the sectional curvature of the space $\mathcal{M}(M)$ of finite measures on a Riemannian manifold M. The space $\mathcal{M}(M)$ is equipped with the Hellinger-Kantorovich metric $HK$. Even in the case M=R^n, the curvature is comprised of two parts: the lifted part' is negative, and the twisted part’ is positive. It will be analyzed in detail for the multidimensional torus. Our general approach to sectional curvature in geodesic spaces also leads to new insights into the curvature of the space $P_2(M)$ of probability measures on M equipped with the Kantorovich-Wasserstein metric $W_2$.