A variational proof of partial regularity for optimal transportation maps

We provide a new proof of the known partial regularity result for the optimal transportation map (Brenier map) between two H.lder continuous densities. Contrary to the existing regularity theory for the Monge-Ampère equation, which is based on the maximum principle, our approach is purely variational. By constructing a competitor on the level of the Eulerian (Benamou- Brenier) formulation, we show that locally, the velocity is close to the gradient of a harmonic function provided the transportation cost is small. We then translate back to the Lagrangian description and perform a Campanato iteration to obtain an ϵ-regularity result.