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Perturbative expansion around the Gaussian effective action: The background field method
Phys. Rev. D 56, 6573 – Published 15 November, 1997
DOI: https://doi.org/10.1103/PhysRevD.56.6573
Abstract
We develop a systematic method of perturbative expansion around the Gaussian effective action based on the background field method. We show, by applying the method to the quantum-mechanical anharmonic oscillator problem, that even the first nontrivial correction terms greatly improve the Gaussian approximation.
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