Property of the spectrum of large-scale magnetic fields from inflation

Details Property of the spectrum of large-scale magnetic fields from inflation Property of the spectrum of large-scale magnetic fields from inflation

2007-03-26

arxiv.org/abs/astro-ph/0703647v2

Phys.Rev.D75:083516,2007

Astronomy and Astrophysics

Astrophysics

8 pages, no figure; references corrected

Scientific paper

10.1103/PhysRevD.75.083516

The property of the spectrum of large-scale magnetic fields generated due to the breaking of the conformal invariance of the Maxwell theory through some mechanism in inflationary cosmology is studied. It is shown that the spectrum of the generated magnetic fields should not be perfectly scale-invariant but be slightly red so that the amplitude of large-scale magnetic fields can be stronger than $\sim 10^{-12}$G at the present time. This analysis is performed by assuming the absence of amplification due to the late-time action of some dynamo (or similar) mechanism.

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