A Tree Theorem for Inflation
High Energy Physics - Theory
2009-02-23 v3 Astrophysics
General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
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.
Cite
@article{arxiv.0805.3781,
title = {A Tree Theorem for Inflation},
author = {Steven Weinberg},
journal= {arXiv preprint arXiv:0805.3781},
year = {2009}
}
Comments
Version accepted for publication in Phys. Rev. D. 22 pages. Some changes to references and clarification in Introduction