Inflationary Magnetogenesis without the Strong Coupling Problem II

Ricardo J. Z. Ferreira, Rajeev Kumar Jain, Martin Snoager Sloth

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Recent observational claims of magnetic fields stronger than $10^{-16}$ G in the extragalactic medium motivate a new look for their origin in the inflationary magnetogenesis models. In this work we shall review the constraints on the simplest gauge invariant model $f^2(\phi)F_{\mu \nu}F^{\mu \nu}$ of inflationary magnetogenesis, and show that in the optimal region of parameter space the anisotropic constraints coming from the induced bispectrum, due to the generated electromagnetic fields, yield the strongest constraints. In this model, only a very fine tuned scenario at an energy scale of inflation as low as $10^{-2}$ GeV can explain the observations of void magnetic fields. These findings are consistent with the recently derived model independent constraints. However, if the detection of primordial tensor modes by BICEP2 is confirmed, the possibility of low scale inflation is excluded. Assuming the validity of the BICEP2 claim of a tensor-to-scalar ratio $r=0.2^{+0.07}_{-0.05}$, we provide the updated constraints on inflationary magnetogenesis. On the Mpc scale, the maximal allowed magnetic field strength from inflation is less than $10^{-30}$ G.
Original languageEnglish
Article number1403.5516
JournalJCAP
Volume2014
Issue numberJune
ISSN1475-7516
DOIs
Publication statusPublished - 21. Mar 2014

Keywords

  • astro-ph.CO
  • hep-ph
  • hep-th

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