Resonant primordial gravitational waves amplification

We propose a mechanism to evade the Lyth bound in models of inflation. We minimally extend the conventional single-field inflation model in general relativity (GR) to a theory with non-vanishing graviton mass in the very early universe. The modification primarily affects the tensor perturbation, whi...

Full description

Saved in:
Bibliographic Details
Published inPhysics letters. B Vol. 752; no. C; pp. 84 - 88
Main Authors Lin, Chunshan, Sasaki, Misao
Format Journal Article
LanguageEnglish
Published Elsevier B.V 10.01.2016
Elsevier
Online AccessGet full text

Cover

More Information
Summary:We propose a mechanism to evade the Lyth bound in models of inflation. We minimally extend the conventional single-field inflation model in general relativity (GR) to a theory with non-vanishing graviton mass in the very early universe. The modification primarily affects the tensor perturbation, while the scalar and vector perturbations are the same as the ones in GR with a single scalar field at least at the level of linear perturbation theory. During the reheating stage, the graviton mass oscillates coherently and leads to resonant amplification of the primordial tensor perturbation. After reheating the graviton mass vanishes and we recover GR.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2015.11.021