Generation of helical magnetic fields from inflation
Cosmology and Nongalactic Astrophysics
2014-03-12 v1 General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
High Energy Physics - Theory
Abstract
The generation of helical magnetic fields during single field inflation due to an axial coupling of the electromagnetic field to the inflaton is discussed. We find that such a coupling always leads to a blue spectrum of magnetic fields during slow roll inflation. Though the helical magnetic fields further evolve during the inverse cascade in the radiation era after inflation, we conclude that the magnetic fields generated by such an axial coupling can not lead to observed field strength on cosmologically relevant scales.
Keywords
Cite
@article{arxiv.1204.2409,
title = {Generation of helical magnetic fields from inflation},
author = {Rajeev Kumar Jain and Ruth Durrer and Lukas Hollenstein},
journal= {arXiv preprint arXiv:1204.2409},
year = {2014}
}
Comments
4 pages, 1 figure; Contribution to the proceedings of the International Conference on Gravitation and Cosmology (ICGC), Goa, India, December, 2011