Résumé en anglais

This paper introduces high-order explicit Runge-Kutta numerical schemes in metric spaces. We show that our approach reduces to corresponding Runge-Kutta schemes if the ambient space is Hilbert. We apply these schemes to compute the Nash equilibrium in a Mean Field vaccination Game. Numerical simulations show improvement in the speed of convergence towards the Nash equilibrium; the numerical scheme has high order (two to four) in time.