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This is a note on the extension of the Benamou-Brenier formulation of optimal transport to nonlinear control affine systems on Rᵈ. They are the non-compact version of the author and collaborators' previous result on compact manifolds, stated here for the sake for completeness. Additionally, by using Bernard's Young measure based weak formulation of optimal transport, the results are established for cases not covered by previous works. Particularly, no assumptions are made on the non-existence of singular minimizing controls or the cost function being Lipschitz. Therefore, the existence of solutions to fluid formulation is established for general Sub-Riemmanian energy costs not covered by literature previously. The results also provide controllability of the continuity equation (using Borel measurable feedback laws) whenever the corresponding Kantorovich problem has a feasible solution, due to the established equivalence between the Kantorovich and Benamou-Brenier formulation.
Karthik Elamvazhuthi (2024) studied this question.