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Description
Rapid expansion of the primordial inflating Universe can lead to large quantum effects known as gravitational particle production. However, vector fields are insensitive to the cosmological expansion because they couple conformally to gravity. However, they may couple to other light fields that are sensitive to the expansion and experience huge gravitational particle production, such as is the complex scalar. In that case the vector field can develop large electric and magnetic field fluctuations induced by the gravitationally enhanced charge fluctuations. I will present a computation of the one-loop corrections to the electric and magnetic field correlators of SQED in power-law inflation. One-loop corrections dwarf the tree-level result, and the slow-roll corrections very soon become large, pointing to non-perturbative phenomena and potentially observable effects.
