EFFECTIVE D = 2 SUPERSYMMETRIC LAGRANGIANS FROM D = 1 SUPERMATRIX MODELS

We discuss d = 1, N = 2 supersymmetric matrix models and exhibit the a ssociated d = 2 collective field theory in the limit of dense eigenval ues. From this theory we construct, by the addition of several new fie lds, a d = 2 supersymmetric effective field theory, which reduces to t he collective field theory when the new fields are replaced with their vacuum expectation values. This effective theory is Poincare invarian t and contains perturbative and non-perturbative information about the associated superstrings. We exhibit instanton solutions corresponding to the motion of single eigenvalues and discuss their possible role i n supersymmetry breaking.