Covariant gaussian approximation. I. formalism

A. Kovner*, Baruch Rosenstein

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

43 Scopus citations


The variational Gaussian approximation is generalized to the time-dependent approach capable of giving time-dependent Greens functions. This covariant Gaussian approximation is represented, in full analogy with the classical approximation, as an initial truncation of the Dyson-Schwinger equations followed by functional differentiation of the effective action. Intuitively simple Schrödinger and Heisenberg pictures of the approximation are also discussed.

Original languageEnglish
Pages (from-to)2332-2342
Number of pages11
JournalPhysical Review D
Issue number8
StatePublished - 1 Jan 1989


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