Power Spectrum of Inflationary Attractors
Abstract
Inflationary attractors predict the spectral index and tensor-to-scalar ratio to take specific values that are consistent with Planck. An example is the universal attractor for models with a generalised non-minimal coupling, leading to Starobinsky inflation. In this paper we demonstrate that it also predicts a specific relation between the amplitude of the power spectrum and the number of e-folds. The length and height of the inflationary plateau are related via the non-minimal coupling: in a wide variety of examples, the observed power normalisation leads to at least 55 flat e-foldings. Prior to this phase, the inflationary predictions vary and can account for the observational indications of power loss at large angular scales.
Keywords
Cite
@article{arxiv.1408.5904,
title = {Power Spectrum of Inflationary Attractors},
author = {Benedict J. Broy and Diederik Roest and Alexander Westphal},
journal= {arXiv preprint arXiv:1408.5904},
year = {2015}
}
Comments
5 pages, 1 figure; v2: added refs; to appear in PRD