Scale independent $R^2$ inflation
General Relativity and Quantum Cosmology
2019-12-18 v3 Cosmology and Nongalactic Astrophysics
High Energy Physics - Phenomenology
High Energy Physics - Theory
Abstract
Weyl (scale) invariant theories of scalars and gravity can generate all mass scales spontaneously. In this paper we study a particularly simple version -- scale invariant gravity -- and show that, during an inflationary period, it leads to fluctuations which, for a particular parameter choice, are almost indistinguishable from normal inflation. Current observations place tight constraints on the primary coupling constant of this theory and predict a tensor to scalar ratio, , which is testable with the next generation of cosmic microwave background experiments.
Cite
@article{arxiv.1906.03415,
title = {Scale independent $R^2$ inflation},
author = {Pedro G. Ferreira and Christopher T. Hill and Johannes Noller and Graham G. Ross},
journal= {arXiv preprint arXiv:1906.03415},
year = {2019}
}