It is pointed out that there is no way to define linear momentum and supercharge for a generic solution to 2 + 1 supergravity, whose asymptotic symmetries only include time translations and spatial rotations. A Hamiltonian expression for the energy and the angular momentum is also given.

• Received 13 December 1983

DOI:https://doi.org/10.1103/PhysRevD.29.2766