Positively curved Kähler metrics on tube domains and their applications to optimal transport

Abstract

In this article, we study a class of Kähler manifolds defined on tube domains in ${\mathbb{C}}^n$, and in particular those which have $O(n)\times {\mathbb{R}}^n$ symmetry. For these, we prove a uniqueness result showing that any such manifold which is complete and has non-negative orthogonal bisectional curvature ($n\ge 3$) or non-negative bisectional curvature ($n\ge 2$) is biholomorphically isometric to ${\mathbb{C}}^n$. We also consider another curvature tensor called the \emph{orthogonal anti-bisectional curvature}. We find necessary and sufficient conditions for a complete $O(n)$-symmetric tube domain to have non-negative orthogonal anti-bisectional curvature and provide several examples of complete metrics which satisfy this condition. Finally, we discuss some applications of these spaces within optimal transport. In particular, we study "synthetic" curvature bounds for non-smooth geometries and how they can be applied to the rough geometry induced by the Monge cost $c(x,y)=\Vert x-y\Vert$.

arXiv comment23 pages. This version replaces the previous version which was titled "The geometry of positively curved Kähler metrics on tube domains" (arXiv:2001.06155v1). Section 6 is changed substantially in this new version and Appendix B is omitted