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Using a semiclassical approach to Gravitoelectromagnetic Inflation (GEMI), westudy the origin and evolution of seminal inflaton and electromagnetic fieldsin the early inflationary universe from a 5D vacuum state. We usesimultaneously the Lorentz and Feynman gauges. Our formalism is naturally notconformal invariant on the effective 4D de Sitter metric, which make possiblethe super adiabatic amplification of electric and magnetic field modes duringthe early inflationary epoch of the universe on cosmological scales. This isthe first time that solutions for the electric field fluctuations areinvestigated in a systematic way as embeddings for inflationary models in 4D.An important and new result here obtained is that the spectrum of the electricfield fluctuations depend with the scale, such that the spectral indexincreases quadratically as the scale decreases.

Coupled inflaton and electromagnetic fields from Gravitoelectromagnetic Inflation with Lorentz and Feynman gauges