A light-front coupled cluster method for quantum field theories

We describe a new method for the nonperturbative solution of quantum field theories. The exponential-operator technique of the traditional, many-body coupled-cluster method is adapted to the Fock-space eigenvalue problem for the light-front Hamiltionian. This leads to an effective eigenvalue problem in the valence Fock sector and a set of nonlinear integral equations for the functions that define the exponential operator. The approach avoids at least some of the difficulties associated with the Fock-space truncation usually used.