A perturbation method closely related to the classical problem of moments has been studied. The lowest order ground-state energy by this method is explicitly comparable to an ordinary third-order perturbation series. Application of this method to simple systems which possess exact solutions showed promising results.
No takes yet. Share an insight, caveat, or question.
Chi Yu Hu (1966) studied this question.
Synapse has enriched one closely related paper. Consider it for comparative context: