Self-consistent and renormalized particle-particle random phase approximation in a schematic model

Abstract

The dynamical effects of ground state correlations for excitation energies and transition strengths near the superfluid phase transition are studied in the soluble two level pairing model, in the context of the particle-particle self-consistent random phase approximation (SCRPA). Exact results are well reproduced across the transition region, beyond the collapse of the standard particle-particle random phase approximation. The effects of two-body correlation in the SCRPA are displayed explicitly.