Higher Order Slow-Roll Predictions for Inflation
General Relativity and Quantum Cosmology
2008-11-26 v2 Astrophysics
High Energy Physics - Theory
Abstract
We study the WKB approximation beyond leading order for cosmological perturbations during inflation. To first order in the slow-roll parameters, we show that an improved WKB approximation leads to analytical results agreeing to within 0.1% with the standard slow-roll results. Moreover, the leading WKB approximation to second order in the slow-roll parameters leads to analytical predictions in qualitative agreement with those obtained by the Green's function method.
Keywords
Cite
@article{arxiv.gr-qc/0506043,
title = {Higher Order Slow-Roll Predictions for Inflation},
author = {R. Casadio and F. Finelli and M. Luzzi and G. Venturi},
journal= {arXiv preprint arXiv:gr-qc/0506043},
year = {2008}
}
Comments
Replaced to match published version