Warm Inflationary Dynamics of Chaplygin Gas Models with Constant Sound Speed

Abstract

In this thesis, we consider a warm in°ation universe model in the con- text of generalized Chaplygin gas and modi¯ed Chaplygin gas by taking Dirac-Born-Infeld non-canonical scalar ¯eld. We determine the two simple potentials which are quartic potential and chaotic potential by considering the ¯rst Friedmann equation. Also, we utilize the Anti-de-Sitter warp factor for the Dirac-Born-Infeld in°ation. In each model, we consider the constant sound speed and also determine the number of e-folds, scalar as well as ten- sor power spectrum, scalar spectral index and tensor-scalar ratio in terms of Á under slow-roll approximation. We establish that graphical behavior of r ¡ N, ns ¡ N and ® ¡ N for Chaplygin gas models are well matched with the 68% and 95% CL constraints of Planck 2018 TT,TE,EE+lowP+lensing data. The graphical behavior represents that the models are compatible with the Planck data in each case. xiii