4.5 Modulated Decay Rate 101 non-Gaussianity) that may test this scenario in the near future. From Section 4.3.1, the decay rate of the φ field is given by The primordial curvature perturbation that is produced by a varying decay rate [24] is given to first order by Differentiating Γ ∼ g $^{2}$m with respect to m gives ζ = δN = − 1 6 δ Γ Γ (4.196) δ Γ ∼ g $^{2}$δm (4.197) Γ ∼ g $^{2}$m (4.195) Fig. 4.15: Prediction of the model for n ′ s for $^{φ}$∗ Case B with primordial inflation being Chaotic Inflation, with α =1 , Γ$_{ϕ}$ ≪ H$_{T I}$ , m$_{ψ}$ =10 − 2 GeV and the parameter values from Table 4.2. (A plot of Eq. (4.189), with $^{φ}$∗ = φ$_{BD}$ , m = m$_{0}$ and Γ = g $^{2}$m$_{0}$ .) The Blue line is the central value of n ′ s as obtained by the Planck spacecraft [40], with the lower and upper bounds being outside the displayed range of n ′ $_{s}$. 10 2 10 4 10 6 10 8 m 0 ( GeV ) - 0.0020 - - 0.0010 -$^{0.0000}$ n$_{s}$