Abstract
We give an exposition of a technique, based on the Zwanzig projection formalism, to construct the evolution equation for the reduced density matrix corresponding to the -particle sector of a field theory. We consider the case of a scalar field with a interaction as an example and construct the master equation at the lowest nonzero order in perturbation theory.
- Received 26 November 1996
DOI:https://doi.org/10.1103/PhysRevD.56.6702
©1997 American Physical Society