The Gaussian Approximation About an Arbi
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G. Puddu
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Article
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1994
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Elsevier Science
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English
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The explicit expression for the Gaussian approximation about any possible mean-field of a given Hamiltonian is derived using functional integration techniques that generalizes the Hubbard-Stratonovich transformation. In the limit of weak two-body potentials it is shown that the Gaussian approximatio