Resonant magnetic fields from inflation

Abstract

We propose a novel scenario to generate primordial magnetic fields during inflation induced by an oscillating coupling of the electromagnetic field to the inflaton. This resonant mechanism has two key advantages over previous proposals. First of all, it generates a narrow band of magnetic fields at any required wavelength, thereby allaying the usual problem of a strongly blue spectrum and its associated backreaction. Secondly, it avoids the need for a strong coupling as the coupling is oscillating rather than growing or decaying exponentially. Despite these major advantages, we find that the backreaction is still far too large during inflation if the generated magnetic fields are required to have a strength of order 10^{-15} Gauss today on observationally interesting scales. We provide a more general no-go argument, proving that this problem will apply to any model in which the magnetic fields are generated on subhorizon scales and freeze after horizon crossing.

13 pages + 7 pages of appendices and references, 3 figures, matches published version

References in corpus (15)

• On the Origin of Cosmic Magnetic Fields
• Large Nongaussianity in Axion Inflation
• Lower limit on the strength and filling factor of extragalactic magnetic fields
• Generation and Characterization of Large Non-Gaussianities in Single Field Inflation
• Magnetic fields from inflation?
• Cosmology with inhomogeneous magnetic fields
• The intracluster magnetic field power spectrum in Abell 2382
• Folded Resonant Non-Gaussianity in General Single Field Inflation
• CMB bispectrum from primordial magnetic fields on large angular scales
• The cosmic microwave background temperature bispectrum from scalar perturbations induced by primordial magnetic fields
• Oscillations in the inflaton potential?
• Resonant Trispectrum and a Dozen More Primordial N-point functions
• Cosmic Magnetic Fields and the CMB
• Galactic and Extragalactic Magnetic Fields
• On inflating magnetic fields, and the backreactions thereof

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