A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2018; you can also visit the original URL.
The file type is
Nonequilibrium quantum fields in the large-Nexpansion
Physical Review D, Particles and fields
An effective action technique for the time evolution of a closed system consisting of one or more mean fields interacting with their quantum fluctuations is presented. By marrying large N expansion methods to the Schwinger-Keldysh closed time path (CTP) formulation of the quantum effective action, causality of the resulting equations of motion is ensured and a systematic, energy conserving and gauge invariant expansion about the quasi-classical mean field(s) in powers of 1/N developed. Thedoi:10.1103/physrevd.50.2848 pmid:10017918 fatcat:rmujzcu2qjboxf3r67qcfktcmq