Improved Gaussian Approximation

Details Improved Gaussian Approximation Improved Gaussian Approximation

1998-10-15

arxiv.org/abs/hep-th/9810122v1

SFINA2:297, 1998

Physics

High Energy Physics

High Energy Physics - Theory

5 pages, Latex 2e, 7 figures, Lectures given at 11th Yugoslav Symposium on Nuclear and Particle Physics, Studenica, September

Scientific paper

In a recently developed approximation technique for quantum field theory the standard one-loop result is used as a seed for a recursive formula that gives a sequence of improved Gaussian approximations for the generating functional. In this paper we work with the generic $\phi^3+\phi^4$ model in $d=0$ dimensions. We compare the first, and simplest, approximation in the above sequence with the one-loop and two-loop approximations, as well as the exact results (calculated numericaly).

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