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Ultra Slow-Roll Inflation and the non-Gaussianity Consistency Relation · Around

2012

Ultra Slow-Roll Inflation and the non-Gaussianity Consistency Relation

Martin, Jerome, Motohashi, Hayato, Suyama, Teruaki

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Ultra slow-roll inflation has recently been used to challenge the non-Gaussianity consistency relation.

We show that this inflationary scenario belongs to a one parameter class of models and we study its properties and observational predictions.
We demonstrate that the power spectrum remains scale-invariant and that the bi-spectrum is of the local type with fnl=5(3-ns)/4 which, indeed, represents a modification of the consistency relation.
However, we also show that the system is unstable and suffers from many physical problems among which is the difficulty to correctly WMAP normalize the model.

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