Tensor to scalar ratio from single field magnetogenesis
Cosmology and Nongalactic Astrophysics
2017-06-28 v1 General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
High Energy Physics - Theory
Abstract
The tensor to scalar ratio is affected by the evolution of the large-scale gauge fields potentially amplified during an inflationary stage of expansion. After deriving the exact evolution equations for the scalar and tensor modes of the geometry in the presence of dynamical gauge fields, it is shown that the tensor to scalar ratio is bounded from below by the dominance of the adiabatic contribution and it cannot be smaller than one thousands whenever the magnetogenesis is driven by a single inflaton field.
Cite
@article{arxiv.1703.10488,
title = {Tensor to scalar ratio from single field magnetogenesis},
author = {Massimo Giovannini},
journal= {arXiv preprint arXiv:1703.10488},
year = {2017}
}
Comments
9 pages