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Reducing the Spectral Index in Supernatural Inflation
Preprint
2009-01-21
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Abstract
Supernatural inflation is an attractive model based just on a flat direction with
soft SUSY breaking mass terms in the framework of supersymmetry. The beauty of the
model is inferred from its name that the model needs no fine-tuning. However, the
prediction of the spectral index is \(n_s \gae 1\), in contrast to experimental data.
In this paper, we show that the beauty of supernatural inflation with the spectral
index reduced to \(n_s=0.96\) without any fine-tuning, by considering the general feature
that a flat direction is lifted by a non-renormalizable term with an A-term.