A Large N reduced model as superstring

Abstract A matrix model which has the manifest ten-dimensional N = 2 super Poincare invariance is proposed. Interactions between BPS-saturated states are analyzed to show that the massless spectrum is the same as that of type IIB string theory. It is conjectured that the large- N reduced model of ten-dimensional super Yang-Mills theory can be regarded as a constructive definition of this model and therefore is equivalent to superstring theory.