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Non-gaussianity in axion Nflation models · Around

2010

Non-gaussianity in axion Nflation models

Kim, Soo A, Liddle, Andrew R, Seery, David

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We study perturbations in the multi-field axion Nflation model, taking account of the full cosine potential.

We find significant differences with previous analyses which made a quadratic approximation to the potential.
The tensor-to-scalar ratio and the scalar spectral index move to lower values, which nevertheless provide an acceptable fit to observation.
Most significantly, we find that the bispectrum non-gaussianity parameter f_NL may be large, typically of order 10 for moderate values of the axion decay constant, increasing to of order 100 for decay constants slightly smaller than the Planck scale.

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