Invariant slow-roll parameters in scalar-tensor theories
Abstract
A general scalar-tensor theory can be formulated in different parametrizations that are related by a conformal rescaling of the metric and a scalar field redefinition. We compare formulations of slow-roll regimes in the Einstein and Jordan frames using quantities that are invariant under the conformal rescaling of the metric and transform as scalar functions under the reparametrization of the scalar field. By comparing spectral indices, calculated up to second order, we find that the frames are equivalent up to this order, due to the underlying assumptions.
Cite
@article{arxiv.1605.07033,
title = {Invariant slow-roll parameters in scalar-tensor theories},
author = {Piret Kuusk and Mihkel Rünkla and Margus Saal and Ott Vilson},
journal= {arXiv preprint arXiv:1605.07033},
year = {2016}
}
Comments
Kindly read also our CQG+ Insight at https://cqgplus.com/2016/10/05/cqg-insight-scalar-tensor-cosmology-inflation-and-invariants/ , 29 pages, a few typos corrected, references added and updated, the text is revised in accordance with the referee's suggestions