In a Starobinsky f(R) inflation model, magnetic fields that are scale-invariant in the Einstein frame become blue or red in the Jordan frame, and both frames can agree only if the coupling is constant and no magnetic field is generated.
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The equivalence between Einstein and Jordan frames: a study based on the inflationary magnetogenesis model
In a Starobinsky f(R) inflation model, magnetic fields that are scale-invariant in the Einstein frame become blue or red in the Jordan frame, and both frames can agree only if the coupling is constant and no magnetic field is generated.