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- W2079437829 abstract "Solutions of the classical $phi^4$-theory in Minkowski space-time are analyzed in a perturbation expansion in the nonlinearity. Using the language of Feynman diagrams, the solution of the Cauchy problem is expressed in terms of tree diagrams which involve the retarded Green's function and have one outgoing leg. In order to obtain general tree diagrams, we set up a classical measurement process in which a virtual observer of a scattering experiment modifies the field and detects suitable energy differences. By adding a classical stochastic background field, we even obtain all loop diagrams. The expansions are compared with the standard Feynman diagrams of the corresponding quantum field theory." @default.
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- W2079437829 date "2012-05-01" @default.
- W2079437829 modified "2023-09-26" @default.
- W2079437829 title "Bosonic Loop Diagrams as Perturbative Solutions of the Classical Field Equations in ϕ<sup>4</sup>-Theory" @default.
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- W2079437829 doi "https://doi.org/10.1063/1.4718333" @default.
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