  The Hamiltonian eigenvalue problem for bound states of a quantum field theory
is formulated in terms of Dirac's light-front coordinates and then approximated
by the exponential-operator technique of the standard coupled-cluster method.
This approximation eliminates any need for the usual approximation of
Fock-space truncation. Instead, the exponential operator is truncated and the
terms retained are determined by a set of nonlinear integral equations. These
equations are solved simultaneously with an effective eigenvalue problem in the
valence sector, where the number of constituents is small. Matrix elements can
be calculated, with extensions of techniques from standard coupled-cluster
theory.
