2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/225757We investigate the origin and evolution of primordial electric and magnetic fields in the early universe, when the expansion is governed by a cosmological constant $Λ_0$. Using the gravitoelectromagnetic inflationary formalism with $A_0=0$, we obtain the power of spectrums for large-scale magnetic fields and the inflaton field fluctuations during inflation. A very important fact is that our formalism is {\em naturally non-conformally invariant}.Accepted for publication in Physics Letters BGeneral Relativity and Quantum Cosmologytext