http://arxiv.org/abs/1501.03520
Motivated by BICEP2’s recent observation of a possibly large primordial tensor component $r$ 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. Analysis of the required number of e-foldings (from the CMB observations) points to the necessity of a very weak inflaton decay and low reheating temperature $T_r$. We show that this can be naturally achieved within 5D gauge inflation giving $T_r\stackrel{<}{_\sim } O(100)$ GeV. This is realized by coupling the bulk fields, generating the inflaton potential, with brane SM states. Some related theoretical issues of the construction, along with phenomenological and cosmological implications, are also discussed.
F. Correia, M. Schmidt and Z. Tavartkiladze
Mon, 19 Jan 15
7/50
Comments: 21 pages LaTex, 3 figures, 2 tables
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