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Curvature spectra and nongaussianities in the roulette inflation model
2008
Journal of High Energy Physics
Using the gradient expansion method of Rigopoulos, Shellard and van Tent which treats cosmological perturbations as gradients on top of a homogeneous and isotropic FRW background, we study the production of nongaussianities in the roulette model of inflation. Investigating a number of trajectories within this two-field model of inflation, we find that while the superhorizon influence of the isocurvature modes on the curvature bispectrum produces nonzero contribution to f_NL, the effect is
doi:10.1088/1126-6708/2008/10/093
fatcat:a277mtobpbagjozkkan43sxphy