List of Figures 2.1 Schematic diagram of history of universe . . . . . . . . . . . . 19 2.2 Mollweide projection of CMB, as observed by Planck spacecraft 21 2.3 Analysis of Δ T T of CMB in spherical harmonics, as observed by Planck spacecraft . . . . . . . . . . . . . . . . . . . . . . . 23 4.1 Potentials in Thermal Inflation scenario . . . . . . . . . . . . . 45 4.2 Potential given by Eq. (4.5) . . . . . . . . . . . . . . . . . . . 49 4.3 Allowed parameter space for $^{ψ}$∗ . . . . . . . . . . . . . . . . . 89 4.4 Allowed parameter space for δψ$_{∗}$ ψ$_{∗}$ . . . . . . . . . . . . . . . . . 89 4.5 Allowed parameter space for H$_{T I}$ . . . . . . . . . . . . . . . . 90 4.6 Allowed parameter space for m$_{ψ}$ . . . . . . . . . . . . . . . . . 90 4.7 Allowed parameter space for h . . . . . . . . . . . . . . . . . . 91 4.8 Prediction for f$_{NL}$ . . . . . . . . . . . . . . . . . . . . . . . . . 92 4.9 Prediction for g$_{NL}$ . . . . . . . . . . . . . . . . . . . . . . . . . 93 4.10 Prediction for N$_{TI}$ . . . . . . . . . . . . . . . . . . . . . . . . . 96 4.11 Prediction for $^{N}$∗ . . . . . . . . . . . . . . . . . . . . . . . . . 97 4.12 Prediction for n$_{s}$ for $^{φ}$∗ Case A: Chaotic Inflation . . . . . . . 98 4.13 Prediction for n ′ s for $^{φ}$∗ Case A: Chaotic Inflation . . . . . . . 99 vi