Seminal magnetic fields from Inflato-electromagnetic Inflation

TL;DR

This paper investigates the origin of primordial magnetic fields during inflation in a 5D vacuum, finding that special non-propagating fields are necessary to generate observable magnetic seeds consistent with current astrophysical constraints.

Contribution

It introduces a new magnetic tensor field in 5D theories and demonstrates that non-propagating fields are essential for producing realistic primordial magnetic fields during inflation.

Findings

Quantum fluctuations of 5D electromagnetic fields are insufficient for magnetic seed generation.

Special non-propagating fields can produce magnetic strengths compatible with observations.

Results support near scale-invariance of primordial magnetic fields as required by data.

Abstract

We extend some previous attempts to explain the origin and evolution of primordial magnetic fields during inflation induced from a 5D vacuum. We show that the usual quantum fluctuations of a generalized 5D electromagnetic field cannot provide us with the desired magnetic seeds. We show that special fields without propagation on the extra non-compact dimension are needed to arrive to appreciable magnetic strengths. We also identify a new magnetic tensor field $B_{ij}$ in this kind of extra dimensional theories. Our results are in very good agreement with observational requirements, in particular from TeV Blazars and CMB radiation limits we obtain that primordial cosmological magnetic fields should be close scale invariance.