Natural Inflation from 5D SUGRA and Low Reheat Temperature
arXiv:1501.03520 · doi:10.1016/j.nuclphysb.2015.06.024
Abstract
Motivated by recent cosmological observations of a possibly unsuppressed primordial tensor component of inflationary perturbations, we reanalyse in detail the 5D conformal SUGRA originated natural inflation model of Ref. [1]. The model is a supersymmetric variant of 5D extra natural inflation, also based on a shift symmetry, and leads to the potential of natural inflation. Coupling the bulk fields generating the inflaton potential via a gauge coupling to the inflaton with brane SM states we necessarily obtain a very slow gauge inflaton decay rate and a very low reheating temperature ~GeV. Analysis of the required number of e-foldings (from the CMB observations) leads to values of in the lower range of present Planck 2015 results. Some related theoretical issues of the construction, along with phenomenological and cosmological implications, are also discussed.
arXiv commentAnalysis and discussions updated in light of recent Planck and joint analysis of BICEP2/Keck and Planck results
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