Primordial magnetic fields from metric perturbations

Details Primordial magnetic fields from metric perturbations Primordial magnetic fields from metric perturbations

2000-08-28

arxiv.org/abs/hep-ph/0008288v3

Phys.Rev.D64:083006,2001

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 1 figure. Final version to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.64.083006

We study the amplification of electromagnetic vacuum fluctuations induced by the evolution of scalar metric perturbations at the end of inflation. Such perturbations break the conformal invariance of Maxwell equations in Friedmann-Robertson-Walker backgrounds and allow the growth of magnetic fields on super-Hubble scales. We relate the strength of the fields generated by this mechanism with the power spectrum of scalar perturbations and estimate the amplification on galactic scales for different values of the spectral index. Finally we discuss the possible effects of finite conductivity during reheating.

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