Katowski-Sachs generalized ghost dark energy cosmological model in Saez-Ballester scalar -tensor theory

Abstract

In this paper we have studied the Kantowski-Sachs (KS) space time filled with generalized ghost dark energy (GGDE) and dark matter in the Saez-Ballester theory of gravitation. The equation of state (EoS) parameter of dark energy (ωλ ) has been formulated as a function of cosmic time and shows quintom like behavior. The properties of density of dark energy (ρλ ) and the density of dark matter (ρm ) indicate the accelerated expansion of the universe. The pressure of the dark energy is negative at present and late time evolution of the universe indicating the accelerated expansion of our universe during these periods. The physical and geometrical aspects of the statefinder parameters (r, s), squared speed of sound ( υ s 2 ) and ω λ − ω ′ λ plane are also discussed.