Is inflationary magnetogenesis sensitive to the postinflationary history?

Dimopoulos, Konstantinos and Ghoshal, Anish and Papanikolaou, Theodoros (2025) Is inflationary magnetogenesis sensitive to the postinflationary history? Physical Review D, 111 (8): 083550. ISSN 1550-7998

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Abstract

Considering inflationary magnetogenesis induced by time-dependent kinetic and axial couplings of a massless Abelian vector boson field breaking the conformal invariance, we show in this article that, surprisingly, the spectral shape of the large-scale primordial magnetic field power spectrum is insensitive to the postinflationary history, namely, the barotropic parameter (w) and the gauge coupling functions of the postinflationary era.