Non-Gaussianities in Multi-field Inflation

@inproceedings{Battefeld2007NonGaussianitiesIM,
  title={Non-Gaussianities in Multi-field Inflation},
  author={Thorsten Battefeld and Richard Easther},
  year={2007}
}
We compute the amplitude of the non-Gaussianities in inflationary models with multiple, uncoupled scalar fields. This calculation thus applies to all models of assisted inflation, including N-flation, where inflation is driven by multiple axion fields arising from shift symmetries in a flux stabilized string vacuum. The non-Gaussianities are associated with nonlinear evolution of the field (and density) perturbations, characterized by the parameter fNL. We derive a general expression for the… CONTINUE READING
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