Inflationary susceptibilities, duality and large-scale magnetic fields generation

Abstract

We investigate what can be said about the interaction of scalar fields with Abelian gauge fields during a quasi-de Sitter phase of expansion and under the assumption that the electric and the magnetic susceptibilities do not coincide. The duality symmetry, transforming the magnetic susceptibility into the inverse of the electric susceptibility, exchanges the magnetic and electric power spectra. The mismatch between the two susceptibilities determines an effective refractive index affecting the evolution of the canonical fields. The constraints imposed by the duration of the inflationary phase and by the magnetogenesis requirements pin down the rate of variation of the susceptibilities that is consistent with the observations of the magnetic field strength over astrophysical and cosmological scales but avoids back-reaction problems. The parameter space of this magnetogenesis scenario is wider than in the case when the susceptibilities are equal, as it happens when the inflaton or some other spectator field is solely coupled to the standard gauge kinetic term.

29 pages, 4 figures

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Cited by in corpus (19)

• Consistent generation of magnetic fields in axion inflation models
• A scenario for inflationary magnetogenesis without strong coupling problem
• Vacuum birefringence and the Schwinger effect in (3+1) de Sitter
• Generation of large-scale magnetic fields, non-Gaussianity, and primordial gravitational waves in inflationary cosmology
• Inflationary Magnetogenesis with Broken Local U(1) Symmetry
• Inflationary dynamics of kinetically-coupled gauge fields
• Inflationary magnetogenesis, derivative couplings and relativistic Van der Waals interactions
• Superhorizon magnetic fields
• Hypermagnetic gyrotropy, inflation and the baryon asymmetry of the Universe
• No-hair conjectures, primordial shear and protoinflationary initial conditions
• Large-scale gauge spectra and pseudoscalar couplings
• Statistical anisotropy from inflationary magnetogenesis
• Smooth magnetogenesis
• Hypermagnetic knots and gravitational radiation at intermediate frequencies
• Spectator Higgs, large-scale gauge fields and the non-minimal coupling to gravity
• Tensor to scalar ratio from single field magnetogenesis
• Effective horizons, junction conditions and large-scale magnetism
• The hypermagnetic power spectra and the phases of Sakharov oscillations
• Squeezed relic photons beyond the horizon