Inflationary models with non-minimally derivative coupling
Abstract
We derive the general formulae for the the scalar and tensor spectral tilts to the second order for the inflationary models with non-minimally derivative coupling without taking the high friction limit. The non-minimally kinetic coupling to Einstein tensor brings the energy scale in the inflationary models down to be sub-Planckian. In the high friction limit, the Lyth bound is modified with an extra suppression factor, so that the field excursion of the inflaton is sub-Planckian. The inflationary models with non-minimally derivative coupling are more consistent with observations in the high friction limit. In particular, with the help of the non-minimally derivative coupling, the quartic power law potential is consistent with the observational constraint at 95\% CL.
Cite
@article{arxiv.1504.05839,
title = {Inflationary models with non-minimally derivative coupling},
author = {Nan Yang and Qin Fei and Qing Gao and Yungui Gong},
journal= {arXiv preprint arXiv:1504.05839},
year = {2017}
}
Comments
v2: add the general formulae without taking the high friction limit, accepted for publication in CQG