Year: 2008
Type: article
Abstract: It is shown that the generating function for tree graphs in the ``in-in'' formalism may be calculated by solving the classical equations of motion subject to certain constraints. This theorem is illustrated by application to the evolution of a single inflaton field in a Robertson-Walker background.
Author: Steven Weinberg
Institution: The University of Texas at Austin
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2045076512