Rayleigh-Schr\"{o}dinger Perturbation Theory Based on Gaussian Wavefunctional Approch
classification
✦ hep-th
keywords
theorydingergaussianperturbationrayleigh-schrvacuumwavefunctionalapproch
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A Rayleigh-Schr\"{o}dinger 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 $\lambda\phi^4$ field theory.
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