arXiv:hep-th/9201037v1 20 Jan 1992 TECHNION -PH-92-1 January 1992 String Field Theory for d ≤ 0 Matrix Models via Marinari-Parisi Joshua Feinberg 1 , 2 Department of Physics, Technion - Israel Institute of Techology Haifa, 32000, Israel. ABSTRACT We generalize the Marinari-Parisi definition for pure two dimensional quantum gravity (k = 2) to all non unitary minimal multicritical points (k ≥ 3). The resulting interacting Fermi gas theory is treated in the collective field framework. Making use of the fact that the matrices evolve in Langevin time, the Jacobian from matrix coordinates to collective modes is similar to the corresponding Jacobian in d = 1 matrix models. The collective field theory is analyzed in the planar limit. The saddle point eigenvalue distribution is the one that defines the original multicritical point and therefore exhibits the appropriate scaling behaviour. Some comments on the nonperturbative properties of the collective field theory as well as comments on the Virasoro constraints associated with the loop equations are made at the end of this letter. There we also make some remarks on the fermionic formulation of the model and its integrability, as a nonlocal version of the non linear Schr¨ odinger model. 1 Supported in part by the Fund for Basic Research administered by the Israel Academy of Sciences and Humanities 2 e-mail address: PRH74JF@TECHNION.BITNET 1