We present a wave function method that accurately treats both the weak and strong correlation regime of electronic hamiltonians. The wave function effectively interpolates between coupled cluster at the doubles level and symmetry projected mean field. For this we use the fact that the symmetry projected mean field can be expressed as a wave operator on the symmetry restricted mean field. All newly introduced parameters are computed self-consistently from higher order residuals. We present results for ground state energies and response properties of the pairing hamiltonian. Although these results are specific for number symmetry breaking, this theory can readily be applied to different types of symmetry restoration.

Symmetry breaking and restoration by similarity transformation

254th National Meeting (2017)

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