Hilltop Inflation and Generation of Helical Magnetic Field

Primordial magnetic field generated in the inflationary era can act as a viable source for present day intergalactic of sufficient strength. We fundamental origin such primordial generation field, namely through anomaly cancellation $U(1)$ gauge quantum electrodynamics context hilltop inflation. have analysed at length power spectrum thus generated, which turns out to be helical nature. also found that has significant scale-dependence giving rise non-trivial spectral index, key feature this model. Interestingly, there exists large parameter space, where strength produced.