4.5 Modulated Decay Rate 100 Fig. 4.14: 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. (4.185), with $^{φ}$∗ = φ$_{BD}$ , m = m$_{0}$ and Γ = g $^{2}$m$_{0}$ .) The Blue and Red lines are the central value and lower/upper bounds of n$_{s}$ respectively as obtained by the Planck spacecraft [40]. nism cannot produce the dominant contribution to the observed primordial curvature perturbation within this Thermal Inflation model as it currently stands. Now we investigate the modulated decay scenario to see if it can produce the dominant contribution to the primordial curvature perturbation ζ . As in Section 4.4, we aim to obtain a number of constraints on the model param- eters and the initial conditions for the fields. Considering these constraints, we intend to determine the available parameter space (if any). In this pa- rameter space we will calculate distinct observational signatures (such as 4.5 Modulated Decay Rate 10 2 10 4 10 6 10 8 m 0 ( GeV ) 0.96 0.97 0.98 0.99 1.00 1.01 1.02 n$_{s}$