Frame-dependence of inflationary observables in scalar-tensor gravity
General Relativity and Quantum Cosmology
2019-04-02 v3 Cosmology and Nongalactic Astrophysics
High Energy Physics - Phenomenology
Abstract
By means of the Green's function method, we computed the spectral indices up to third order in the slow-roll approximation for a general scalar-tensor theory in both the Einstein and Jordan frames. Using quantities which are invariant under the conformal rescaling of the metric and transform as scalar functions under the reparametrization of the scalar field, we showed that the frames are equivalent up to this order due to the underlying assumptions. Nevertheless, care must be taken when defining the number of -folds.
Keywords
Cite
@article{arxiv.1903.03548,
title = {Frame-dependence of inflationary observables in scalar-tensor gravity},
author = {Alexandros Karam and Thomas Pappas and Kyriakos Tamvakis},
journal= {arXiv preprint arXiv:1903.03548},
year = {2019}
}
Comments
15 pages, 2 figures, talk (based on arXiv:1707.00984) given at Corfu Summer Institute 2018 "School and Workshops on Elementary Particle Physics and Gravity", September 2018