Nflation: non-gaussianity in the horizon-crossing approximation

Details Nflation: non-gaussianity in the horizon-crossing approximation Nflation: non-gaussianity in the horizon-crossing approximation

2006-08-09

arxiv.org/abs/astro-ph/0608186v1

Phys.Rev. D74 (2006) 063522

Astronomy and Astrophysics

Astrophysics

3 pages RevTeX4, no figures

Scientific paper

10.1103/PhysRevD.74.063522

We analyze the cosmic non-gaussianity produced in inflation models with multiple uncoupled fields with monomial potentials, such as Nflation. Using the horizon-crossing approximation to compute the non-gaussianity, we show that when each field has the same form of potential, the prediction is independent the number of fields, their initial conditions, and the spectrum of masses/couplings. It depends only on the number of e-foldings after the horizon crossing of observable perturbations. We also provide a further generalization to the case where the fields can have monomial potentials with different powers. Unless the horizon-crossing approximation is substantially violated, the predicted non-gaussianity is too small to ever be observed.

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