Spin dependent D-brane interactions and scattering amplitudes in matrix theory

Spin interactions between two moving Dp-branes are analyzed using the Green-Schwarz formalism of boundary states. This approach turns out to be extremely efficient to compute all the spin effects related by supersymmetry to the leading v 4/r 7−p term. All these terms are shown to be scale invariant, supporting a matrix model description of supergravity interactions.