Mean-Field Theory for Fermion Pairs and the ab initio Particle-Vibration-Coupling Approach

Abstract

A Dyson Bethe-Salpeter equation (Dyson-BSE) for fermion pairs is presented whose kernel has a static and a one frequency dependent contribution, analogous to the self energy of the single particle Dyson equation with the (static) mean field term and the energy dependent correlation term. The static part of the Dyson-BSE is the self-consistent mean field for the vibrations. At the same time, for the correlated single particle self-energy a full particle-vibration coupling (PVC) scattering equation is established where the vibration is the same as obtained from the Dyson-BSE. Both equations, single particle Dyson equation and Dyson-BSE, are coupled through self-consistency. Numerical results for Lipkin and 1D Hubbard chain are very promising.

Article in memoriam of P.F. Bortignon

References in corpus (3)

• A formally exact one-frequency-only Bethe-Salpeter-like equation. Similarities and differences between GW +BSE and self-consistent RPA
• Medium polarization effects in 3SD1 spin-triplet pairing
• Coupled Self-Consistent RPA Equations for Even and Odd Particle Numbers. Tests with Solvable Models

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