On the challenges in the choice of the non-conformal coupling function in inflationary magnetogenesis

Understand

Primordial magnetic fields are generated during inflation by considering actions that break the conformal invariance of the electromagnetic field.

• To break the conformal invariance, the electromagnetic fields are coupled either to the inflaton or to the scalar curvature.
• Also, a parity violating term is often added to the action in order to enhance the amplitudes of the primordial electromagnetic fields.
• In this work, we examine the effects of deviations from slow roll inflation on the spectra of non-helical as well as helical electromagnetic fields.