String Field Theory and Non-perturbative Effects

We describe a real-time classical solution of c = 1 string field theory written in terms of the phase space density, u(p, q, t), of the equivalent fermion theory. The solution corresponds to tunnelling of a single fermion above the filled fermi sea and leads to amplitudes that go as exp(−C/gstr). We discuss how one can use this technique to describe non-perturbative effects in the Marinari-Parisi model. We also discuss implications of this type of solution for the two-dimensional black hole. ⋆ [email protected]. † [email protected]. ‡ [email protected]