Warm inflation with bulk viscous pressure for different solutions of an anisotropic universe

Abstract We study a warm inflationary model for different expansions assuming an anisotropic universe described by Bianchi I metric. The universe is filled with a scalar field or inflaton, radiation, and bulk viscous pressure. We carry out the inflationary analysis for different solutions of such universe in two different cases of the coefficient of dissipation Γ and the coefficient of bulk viscosity ξ as constant and variable parameters, respectively. We compare the obtained results with the recent observations, in order to find the observational constraints on the parameter space of the models. Moreover, we attempt to present a better judgment among the considered models by calculation of the non-linear parameter f NL describing the non-Gaussianity property of the models.