Horizon Feedback Inflation
Abstract
We consider the effect of the Gibbons-Hawking radiation on the inflaton in the situation where it is coupled to a large number of spectator fields. We argue that this will lead to two important effects - a thermal contribution to the potential and a gradual change in parameters in the Lagrangian which results from thermodynamic and energy conservation arguments. We present a scenario of hilltop inflation where the field starts trapped at the origin before slowly experiencing a phase transition during which the field extremely slowly moves towards its zero temperature expectation value. We show that it is possible to obtain enough e-folds of expansion as well as the correct spectrum of perturbations without hugely fine-tuned parameters in the potential (albeit with many spectator fields). We also comment on how initial conditions for inflation can arise naturally in this situation.
Cite
@article{arxiv.1712.07977,
title = {Horizon Feedback Inflation},
author = {Malcolm Fairbairn and Tommi Markkanen and David Rodriguez-Roman},
journal= {arXiv preprint arXiv:1712.07977},
year = {2018}
}
Comments
v1: 17 pages, 5 figures. v2: updated discussion and references, removed typos, submitted to journal. v3: minor revisions, version published in EPJC