http://arxiv.org/abs/1404.5230
In the lights of current BICEP2 observations accompanied with the PLANCK satellite results, it has been observed that the simple single field chaotic inflationary models provide a good agreement with their spectral index n_s and large tensor-to-scalar ratio r (0.15 <r <0.26). To explore the other simple models, we consider the fractional chaotic inflation models with potentials V_0 phi^(a/b) where a and b are relatively prime. We show that such kind of inflaton potentials can be realized elegantly in the supregravity framework with generalized shift symmetry for a/b < 4. Especially, for the number of e-folding from 50 to 60 and some a/b from 2 to 3, our predictions are nicely within the at least 1 sigma region in the r-n_s plane.
X. Gao, T. Li and P. Shukla
Tue, 22 Apr 14
37/54
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