Inflationary study of intermediate modified Chaplygin gas with bulk viscous pressure

Abstract

In this paper, we study the efiects of bulk viscous pressure on warm in∞ationary modifled Chaplygin gas model using FRW background. In∞aton and imperfect ∞uid (matter-radiation) are assumed to be the matter contents of the universe. We develop the present model during intermediate era and evaluate in∞aton flelds, efiective potentials and entropy density for variable as well as constant dissipation and bulk viscous coe‐cients in high dissipative regime. In order to discuss in∞ationary perturbations, we constraint scalar (tensor) power spectra, their corresponding spectral indices, tensor-scalar ratio and running of spectral index using recent observations. The graphical analysis of these perturbed parameters shows that the viscous in∞ationary model remains compatible with WMAP7 and Planck probe.