S. S. Chabysheva, J. R. Hiller
The light-front coupled-cluster method is a technique for solving Hamiltonian eigenvalue problems in light-front-quantized field theories. Its primary purpose is to provide a systematic sequence of solvable approximations to the original eigenvalue problem without the truncation of Fock space. Here we discuss the incorporation of zero modes, modes of zero longitudinal momentum, into the formalism of the method. The use and importance of these modes are illustrated in two-dimensional model field theories.
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http://arxiv.org/abs/1208.6076
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