Inflationary Scenario in Bianchi Type-V Spacetime with Variable Bulk Viscosity & Dark Energy in Radiation Dominated Phase

Abstract

Inflationary scenario in Bianchi Type V space-time with variable bulk viscosity and dark energy in radiation dominated phase is discussed. We consider exact cosmological solutions of the Einstein gravitational equations with non-interacting combination of a classical scalar field and isotropic radiation as a source. The model isotropizes in special case and at late time i.e. the model isotropizes asymptotically and the presence of bulk viscosity accelerates the isotropization. The spatial volume increases exponentially representing inflationary scenario and this expansion continues for long enough, thus solves horizon problem.. The deceleration parameter (q) < 0 indicates accelerating universe. Thus, the model represents not only expanding but accelerating universe. (Riess et al.³, Perlmutter et al.⁴) The slow roll parameters (Î,d,S) are in agreement with Planck (2013) results. In earlier paper Bali and Singh discussed inflationary scenario in Bianchi-Type V space time with variable bulk viscosity and vacuum energy density for barotropic build distribution where analytical solution was not possible.