Before revision:  For this problem , we find an associated K\"ahler manifold whose orthogonal holomorphic bisectional curvature is proportional to the so-called MTW tensor, which was introduced by Ma, Trudinger, and Wang and plays an essential role in the regularity theory of optimal transport .
After revision:  For this problem , we find an associated K\"ahler manifold whose orthogonal holomorphic bisectional curvature is proportional to the MTW tensor .