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MiS Preprint
12/2012

Bosonic Loop Diagrams as Perturbative Solutions of the Classical Field Equations in $\phi^4$ Theory

Felix Finster and Jürgen Tolksdorf

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.

Received:
Feb 24, 2012
Published:
Mar 2, 2012
MSC Codes:
70Sxx, 81T10, 81Uxx
PACS:
11.10Ef, 11.10Lm, 11.15Kc
Keywords:
Classical Nonlinear Scattering Problem, Feynman Diagrams, Stochastic Initial Values

Related publications

inJournal
2012 Repository Open Access
Felix Finster and Jürgen Tolksdorf

Bosonic loop diagrams as perturbative solutions of the classical field equations in \( \phi^4\)-theory

In: Journal of mathematical physics, 53 (2012) 5, p. 052305