Excitation of Photons by Inflationary Gravitons

Abstract

We use a recent result for the graviton contribution to the one loop vacuum polarization to solve the effective field equations for dynamical photons on de Sitter background. Our results show that the electric field experiences a secular enhancement proportional to the number of inflationary e-foldings. We discuss the minimum this establishes for primordial inflation to seed cosmic magnetic fields.

arXiv commentVersion 2 revised for publication in Physical Review D contains substantial discussion of the eventual breakdown of perturbation implied by our result

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• Photon propagator for inflation in the general covariant gauge
• Big Steve and the State of the Universe
• Quantum gravitational anomaly as a dark matter
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• Gauge dependence in QED amplitudes in expanding de Sitter space
• Some Inconvenient Truths
• The Case for Nonlocal Modifications of Gravity
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• Parametric resonance in abelian and non-abelian gauge fields via space-time oscillations