Variational Approach to Quantum Field Theory: Gaussian Approximation and the Perturbative Expansion around It

Details Variational Approach to Quantum Field Theory: Gaussian Approximation and the Perturbative Expansion around It Variational Approach to Quantum Field Theory: Gaussian Approximation and the Perturbative Expansion around It

1997-07-29

arxiv.org/abs/hep-th/9707234v2

Physics

High Energy Physics

High Energy Physics - Theory

To appear in the proceedings of APCTP-ICTP Joint International Conference '97 on "Recent Developments in Nonperturbative Quant

Scientific paper

The functional Schrodinger picture formulation of quantum field theory and the variational Gaussian approximation method based on the formulation are briefly reviewed. After presenting recent attempts to improve the variational approximation, we introduce a new systematic method based on the background field method, which enables one to compute the order-by-order correction terms to the Gaussian approximation of the effective action.

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