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Variational Approach to Quantum Field Theory: Gaussian Approximation and the Perturbative Expansion around It
Jae Hyung Yee (Yonsei Univ.)
arXiv: hep-th/9707234v2 (hep-th)
To appear in the proceedings of APCTP-ICTP Joint International Conference '97 on "Recent Developments in Nonperturbative Quantum Field Theory". new references are added
Licence : non indiquée (tous droits réservés)
Résumé : 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.
Soumis à arXiv le 29 Jul. 1997