Cosmological diagrammatic rules
arXiv:1005.3287 · doi:10.1088/1475-7516/2010/07/015
Abstract
A simple set of diagrammatic rules is formulated for perturbative evaluation of ``in-in" correlators, as is needed in cosmology and other nonequilibrium problems. These rules are both intuitive, and efficient for calculational purposes.
7 pages, 3 figures