Abstract
AbstractThis talk shows that non-minimal coupling to the Riemann tensor generates sufficient primordial helical magnetic fields at all observable scales. The model has three key features: (i) the helical power spectrum has a slight red tilt for slow-roll inflation consistent with bounds from observations and free from back-reaction problem, (ii) the energy density of the helical fields generated is at least one order of magnitude larger than the scalar-field-coupled models, and (iii) unlike the scalar-field-coupled models, the generated helical fields are insensitive to the reheating dynamics. We show that the model generates the magnetic field of strength 0.01 PicoGauss over \(\textrm{Mpc}\) scale.KeywordsHelical magnetic fieldsBased on the work[1]
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