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2009

Reducing the Spectral Index in Supernatural Inflation

Lin, Chia-Min, Cheung, Kingman

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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.

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