Discovery of Large Scale Tensor Mode and Chaotic Inflation in Supergravity
arXiv:1403.4729 · doi:10.1016/j.physletb.2014.05.012
Abstract
The BICEP2 collaboration has recently reported a large tensor fluctuation in the cosmic microwave background, which suggests chaotic inflation models. In this letter, we reconsider the chaotic inflation model in the supergravity. We introduce a non-holomorphic shift-symmetry breaking parameter, which we expect to exist in general, and discuss its effect on the inflaton dynamics. We show that the model predicts a sizable deviation from the original chaotic inflation model and the predicted tensor fluctuation can lie between the BICEP2 result and the upper bound given by the Planck experiment with a small shift-symmetry breaking parameter. The model is characterized by only two parameters, which yields predictability and testability in future experiments.
11 pages, 6 figures; v2 : updated to match the published version
References in corpus (4)
Cited by in corpus (27)
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