Cosmological magnetic fields by parametric resonance?

Details Cosmological magnetic fields by parametric resonance? Cosmological magnetic fields by parametric resonance?

2000-07-19

arxiv.org/abs/astro-ph/0007290v1

Astronomy and Astrophysics

Astrophysics

4 pages, no figures. Talk given at COSMO 99: 3rd International Conference on Particle Physics and the Early Universe, Trieste,

Scientific paper

We investigate the possibility that electromagnetic fluctuations are amplified in expanding universe by parametric resonance, during the oscillatory regime of a scalar field to which they are coupled. We consider scalar electrodynamics and we find that electromagnetic fluctuations undergo exponential instabilities. This mechanism could have some relevance for the problem of large scale primordial magnetic fields.

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