Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1997-06-09
Physics
High Energy Physics
High Energy Physics - Theory
To appear in the proceedings to be published by World Scientific of APCTP-ICTP Joint International Conference '97 on 'Recent D
Scientific paper
We present a nonperturbative field theoretic method based on the Liouville-Neumann (LN) equation. The LN approach provides a unified formulation of nonperturbative quantum fields and also nonequilibrium quantum fields, which makes use of mean-field type equations and whose results at the lowest level are identically the same as those of the Gaussian effective potential approach and the mean-field approach. The great advantageous point of this formulation is its readiness of applicability to time-dependent quantum systems and to finite temperature field theory, and its possibility to go beyond the Gaussian approximation.
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