Ground-State Energy of a Many-Fermion System. II

The perturbation series for the ground-state energy of a many-fermion system was investigated to arbitrary order for the "isotropic" case. This is the case of over-all spherical symmetry. both in the interaction and in the unperturbed single particle energies. It was shown that for spin one-half feninions the Brueckner-Goldstone perturbation series is valid to all orders in the perturbation. For spins greater than one-half it is in general incorrect even in the isotropic case. unless the interactions are spin independent. The discussion to arbitrary order in the interaction ts carried out by means of a Feynman-like propagator formalism, which is developed in detail. (auth)