Answers are grounded in this paper and cite their sources.
The purpose of this paper is to point out the steps in conventional many-body perturbation theory which requires separate, additional justification over and above convergence of the pertubation series. The questionable step is the cancellation of the renormalized energy shift by the chemical potential, neglecting any possible modification of the wave functions as well as state-dependent energy shifts.
No takes yet. Share an insight, caveat, or question.
Philip W. Anderson (1993) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: