Abstract
The standard calculation of the spectrum of density perturbations produced during inflation assumes (i) and (ii) Slow-roll predicts and observations require (i), but neither slow-roll nor observations require (ii). In this paper I derive formulas for the spectrum spectral index and running of the spectral index assuming only (i) and not (ii). I give a large class of observationally viable examples in which these general slow-roll formulas are accurate but the standard slow-roll formulas for the spectral index and running are incorrect.
- Received 15 October 2001
DOI:https://doi.org/10.1103/PhysRevD.65.103508
©2002 American Physical Society