Effective field theories and inflationary magnetogenesis

Abstract

The effective approach is applied to the analysis of inflationary magnetogenesis. Rather than assuming a particular underlying description, all the generally covariant terms potentially appearing with four space-time derivatives in the effective action have been included and weighted by inflaton-dependent couplings. The higher derivatives are suppressed by the negative powers of a typical mass scale whose specific values ultimately depend on the tensor to scalar ratio. During a quasi-de Sitter stage the corresponding corrections always lead to an asymmetry between the hypermagnetic and the hyperelectric susceptibilities. After presenting a general method for the estimate of the gauge power spectra, the obtained results are illustrated for generic models and also in the case of some non-generic scenarios where either the inflaton has some extra symmetry or the higher-order terms are potentially dominant.

10 pages, 2 figures

References in corpus (4)

• Effective Field Theory for Inflation
• The Refractive Index of Curved Spacetime: the Fate of Causality in QED
• Entropy perturbations and large-scale magnetic fields
• Polarized backgrounds of relic gravitons

Cited by in corpus (5)

• Hypermagnetogenesis from axion inflation: Model-independent estimates
• Primordial Helical Magnetic Fields from Inflation?
• Large-scale gauge spectra and pseudoscalar couplings
• Effective field theory of magnetogenesis identify necessary and sufficient conditions
• The hypermagnetic power spectra and the phases of Sakharov oscillations