Large-scale magnetic fields from inflation in dilaton electromagnetism

By Kazuharu Bamba, Jun'ichi Yokoyama. 2003

155 citations recorded by the source corpus.

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.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/56dcf3fe027e053d32ceee7d779d8cb2dd888a88

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

Citations in the corpus

Generation of large scale magnetic fields in single-field inflation (2007, background): “The fact that back-reaction is always satisfied when α ∼ 2 while it requires low scale inflation in the case α ∼ −3 can be easily understood, see also [43].”