Angular momentum and long-range gravitational interactions in matrix theory

We consider subleading terms in the one-loop matrix theory potential between a classical membrane state and a supergraviton. Non-trivial terms arise at order v/r8 and v3/r8 which are proportional to the angular momentum of the membrane state. The effective potential for a graviton moving in a boosted Kerr-type metric is computed and shown to agree precisely with the matrix theory calculation at leading order in the long-distance expansion for each power of the graviton velocity. This result generalizes to arbitrary order; we show that terms in the membrane-graviton potential corresponding to nth moments of the membrane stress-energy tensor are reproduced correctly to all orders in the long-distance expansion by terms of the form F4 Xn in the one-loop matrix theory calculation. (orig.)