Large-scale magnetic fields from inflation in dilaton electromagnetism

Details Large-scale magnetic fields from inflation in dilaton electromagnetism Large-scale magnetic fields from inflation in dilaton electromagnetism

2003-10-29

arxiv.org/abs/astro-ph/0310824v2

Phys.Rev.D69:043507,2004

Astronomy and Astrophysics

Astrophysics

28 pages, 5 figures, the version accepted for publication in Phys. Rev. D; some references are added

Scientific paper

10.1103/PhysRevD.69.043507

The generation of large-scale magnetic fields is studied in dilaton electromagnetism in inflationary cosmology, taking into account the dilaton's evolution throughout inflation and reheating until it is stabilized with possible entropy production. It is shown that large-scale magnetic fields with observationally interesting strength at the present time could be generated if the conformal invariance of the Maxwell theory is broken through the coupling between the dilaton and electromagnetic fields in such a way that the resultant quantum fluctuations in the magnetic field has a nearly scale-invariant spectrum. If this condition is met, the amplitude of the generated magnetic field could be sufficiently large even in the case huge amount of entropy is produced with the dilution factor $\sim 10^{24}$ as the dilaton decays.

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