Simple single-field inflation models with arbitrarily small tensor/scalar ratio
Cosmology and Nongalactic Astrophysics
2023-03-15 v2
Abstract
We construct a family of simple single-field inflation models consistent with Planck / BICEP Keck bounds which have a parametrically small tensor amplitude and no running of the scalar spectral index. The construction consists of a constant-roll hilltop inflaton potential with the end of inflation left as a free parameter induced by higher-order operators which become dominant late in inflation. This construction directly demonstrates that there is no lower bound on the tensor/scalar ratio for simple single-field inflation models.
Keywords
Cite
@article{arxiv.2210.05757,
title = {Simple single-field inflation models with arbitrarily small tensor/scalar ratio},
author = {Nina K. Stein and William H. Kinney},
journal= {arXiv preprint arXiv:2210.05757},
year = {2023}
}
Comments
14 pages, 2 figures (V3: Version submitted to JCAP)