Article révisé par les pairs
Résumé : The two-dimensional super-BMS3 invariant theory dual to three-dimensional asymptotically flat N= 1 supergravity is constructed. It is described by a constrained or gauged chiral Wess-Zumino-Witten action based on the super-Poincaré algebra in the Hamiltonian, respectively the Lagrangian formulation, whose reduced phase space description corresponds to a supersymmetric extension of flat Liouville theory.