Power Spectrum of Inflationary Attractors
arXiv:1408.5904 · doi:10.1103/PhysRevD.91.023514
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.
5 pages, 1 figure; v2: added refs; to appear in PRD
References in corpus (11)
- The Standard Model Higgs boson as the inflaton
- Higgs inflation: consistency and generalisations
- Power-counting and the Validity of the Classical Approximation During Inflation
- Eternal inflation and its implications
- Superconformal Symmetry, NMSSM, and Inflation
- Higgs inflation at the critical point
- Higgs inflation still alive
- Whipped inflation
- Just enough inflation: power spectrum modifications at large scales
- Negative running prevents eternal inflation
- Naturalness in Higgs inflation in a frame independent formalism