Christian T. Byrnes, Jinn-Ouk Gong
We compute the scale dependence of fNL for multi-field inflation model, allowing for an arbitrary field space metric. We show that, in addition to multi-field effects and self interactions, the curved field space metric provides another source of scale dependence, which arises from the field-space Riemann curvature tensor and its derivatives. The scale dependence may be detectable within the near future if the amplitude of fNL is not too far from the current observational bounds.
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http://arxiv.org/abs/1210.1851
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