Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2007-10-30
Recent Developments in Quantum Field Theory, Leipzig : Allemagne (2007)
Physics
High Energy Physics
High Energy Physics - Theory
13 pages, 6 figures
Scientific paper
10.1007/978-3-7643-8736-5_10
In quantum field theory, the Green function is usually calculated as the expectation value of the time-ordered product of fields over the vacuum. In some cases, especially in degenerate systems, expectation values over general states are required. The corresponding Green functions are essentially more complex than in the vacuum, because they cannot be written in terms of standard Feynman diagrams. Here, a method is proposed to determine the structure of these Green functions and to derive nonperturbative equations for them. The main idea is to transform the cumulants describing correlations into interaction terms.
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