Rayleigh-Schrödinger Perturbation Theory Based on Gaussian Wavefunctional Approch

Abstract

A Rayleigh-Schrödinger perturbation theory based on the Gaussian wavefunctional is constructed. The method can be used for calculating the energies of both the vacuum and the excited states. A model calculation is carried out for the vacuum state of the $\lambda {\varphi }^4$ field theory.

revtex, 7 pages, no figures

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