Generation of large scale magnetic fields by coupling to curvature and dilaton field

Abstract

We investigate the generation of large scale magnetic fields in the universe from quantum fluctuations produced in the inflationary stage. By coupling these quantum fluctuations to the dilaton field and Ricci scalar, we show that the magnetic fields with the strength observed today can be produced. We consider two situations: First, the evolution of dilaton ends at the onset of the reheating stage. Second, the dilaton continues its evolution after reheating and then decays. In both cases, we come back to the usual Maxwell equations after inflation and then calculate present magnetic fields.

arXiv comment22 pages

References in corpus (2)

• Primordial Magnetic Fields
• Generation of Magnetic Fields in Cosmology

Cited by in corpus (11)

• A Model of Universe Anisotropization
• Helical Magnetic Fields from Inflation
• Inflation-Produced Magnetic Fields in R^n F^2 and I F^2 models
• Generic estimates for magnetic fields generated during inflation including Dirac-Born-Infeld theories
• The interrelation between the generation of large-scale electric fields and that of large-scale magnetic fields during inflation
• Maxwell-Kostelecký Electromagnetism and Cosmic Magnetization
• Evolution of primordial magnetic fields in mean-field approximation
• Superhorizon magnetic fields
• Large-scale gauge spectra and pseudoscalar couplings
• Large-scale magnetic fields from inflation due to a $CPT$-even Chern-Simons-like term with Kalb-Ramond and scalar fields
• The hypermagnetic power spectra and the phases of Sakharov oscillations