Resonant Amplification of Gauge Fields in Expanding Universe
High Energy Physics - Phenomenology
2014-11-17 v2 Astrophysics
General Relativity and Quantum Cosmology
High Energy Physics - Theory
Abstract
We investigate the possibility that gauge fluctuations are amplified in an expanding universe by parametric resonance, during the oscillatory regime of a scalar field to which they are coupled. We investigate the couplings of gauge fields to a charged scalar field and to an axion. For both couplings, gauge field fluctuations undergo exponential instabilities. We discuss how the presence of other charges or currents may counteract the resonance, but we argue that in some cases the resonance will persist and that hence this mechanism could have some relevance for the problem of large scale primordial magnetic fields.
Keywords
Cite
@article{arxiv.hep-ph/0001231,
title = {Resonant Amplification of Gauge Fields in Expanding Universe},
author = {F. Finelli and A. Gruppuso},
journal= {arXiv preprint arXiv:hep-ph/0001231},
year = {2014}
}
Comments
6 pages, title changed, one section added, version accepted on PLB