Faddeev description of two-hole-one-particle motion and the single-particle spectral function - art. no. 034313

The Faddeev technique is employed to address the problem of describing the influence of both particle-particle and particle-hole phonons on the single -particle self-energy. The scope of the few-body Faddeev equations is exten ded to describe the motion of two-hole-one-particle (two-particle-one-hole) excitations. This formalism allows one to sum both particle-particle and p article-hole phonons. obtained separately in the random phase approximation . The appearance of spurious solutions for the present application of the F addeev method is related to the inclusion of a consistent set of diagrams. The formalism presented here appears practical for finite nuclei and achiev es a simultaneous inclusion of particle-particle and particle-hole phonons to all orders while the spurious solutions are properly eliminated.