Inflationary magnetogenesis without the strong coupling problem

The simplest gauge invariant models of inflationary magnetogenesis are known to suffer from the problems of either large backreaction or strong coupling, which make it difficult to self-consistently achieve cosmic magnetic fields from inflation with a field strength larger than 10 super(-32)G today...

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Published inJournal of cosmology and astroparticle physics Vol. 2013; no. 10; pp. I - 21
Main Authors Ferreira, Ricardo JZ, Jain, Rajeev Kumar, Sloth, Martin S
Format Journal Article
LanguageEnglish
Published United States 01.10.2013
Subjects
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
CONFORMAL INVARIANCE
COUPLING
ELECTROMAGNETISM
Field strength
Gages
GAUGE INVARIANCE
Heating
Inflation
INFLATIONARY UNIVERSE
INFLATONS
Invariants
Joining
LIMITING VALUES
MAGNETIC FIELDS
Scale (ratio)
Strength
UNIVERSE
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Summary:The simplest gauge invariant models of inflationary magnetogenesis are known to suffer from the problems of either large backreaction or strong coupling, which make it difficult to self-consistently achieve cosmic magnetic fields from inflation with a field strength larger than 10 super(-32)G today on the Mpc scale. Such a strength is insufficient to act as seed for the galactic dynamo effect, which requires a magnetic field larger than 10 super(-20)G. In this paper we analyze simple extensions of the minimal model, which avoid both the strong coupling and back reaction problems, in order to generate sufficiently large magnetic fields on the Mpc scale today. First we study the possibility that the coupling function which breaks the conformal invariance of electromagnetism is non-monotonic with sharp features. Subsequently, we consider the effect of lowering the energy scale of inflation jointly with a scenario of prolonged reheating where the universe is dominated by a stiff fluid for a short period after inflation. In the latter case, a systematic study shows upper bounds for the magnetic field strength today on the Mpc scale of 10 super(-13)G for low scale inflation and 10 super(-25)G for high scale inflation, thus improving on the previous result by 7-19 orders of magnitude. These results are consistent with the strong coupling and backreaction constraints.
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ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2013/10/004