Multiple Inflationary Stages with Varying Equation of State
Abstract
We consider a model of inflation consisting a single fluid with a time-dependent equation of state. In this phenomenological picture, two periods of inflation are separated by an intermediate non-inflationary stage which can be either a radiation dominated, matter dominated or kinetic energy dominated universe, respectively, with the equation of state , 0 or 1. We consider the toy model in which the change in happens instantaneously. Depending on whether the mode of interest leaves the horizon before or after or between the phase transitions, the curvature power spectrum can have non-trivial sinusoidal modulations. This can have interesting observational implications for CMB anisotropies and for primordial black-hole formation.
Cite
@article{arxiv.1207.3638,
title = {Multiple Inflationary Stages with Varying Equation of State},
author = {Mohammad Hossein Namjoo and Hassan Firouzjahi and Misao Sasaki},
journal= {arXiv preprint arXiv:1207.3638},
year = {2015}
}
Comments
minor revision, published version