Pre-reheating Magnetogenesis in the Kinetic Coupling Model

Understand

Recent blazar observations provide growing evidence for the presence of magnetic fields in the extragalactic regions.

• While a natural speculation is to associate the production to inflationary physics, it has been known that magnetogenesis solely from inflation is quite challenging.
• We therefore study a model in which a non-inflaton field $\chi$ coupled to the electromagnetic field through its kinetic term, $-I^2(\chi) F^2 /4$, continues to move after inflation until the completion of reheating.
• This leads to a post-inflationary amplification of the electromagnetic field.