Critical constraint on inflationary magnetogenesis

Tomohiro Fujita, Shuichiro Yokoyama

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)


Recently, there are several reports that the cosmic magnetic fields on Mpc scale in void region is larger than ∼ 10-15G with an uncertainty of a few orders from the current blazar observations. On the other hand, in inflationary magnetogenesis models, additional primordial curvature perturbations are inevitably produced from iso-curvature perturbations due to generated electromagnetic fields. We explore such induced curvature perturbations in a model independent way and obtained a severe upper bound for the energy scale of inflation from the observed cosmic magnetic fields and the observed amplitude of the curvature perturbation , as ρinf1/4 < 300MeV × (Bobs/10-15G)-1 where Bobs is the strength of the magnetic field at present. Therefore, without a dedicated low energy inflation model or an additional amplification of magnetic fields after inflation, inflationary magnetogenesis on Mpc scale is generally incompatible with CMB observations.

Original languageEnglish
Article number013
JournalJournal of Cosmology and Astroparticle Physics
Issue number3
Publication statusPublished - 2014 Mar
Externally publishedYes


  • extragalactic magnetic fields
  • ination
  • primordial magnetic fields

ASJC Scopus subject areas

  • Astronomy and Astrophysics


Dive into the research topics of 'Critical constraint on inflationary magnetogenesis'. Together they form a unique fingerprint.

Cite this