Cosmological Implications Of Equation Of State

Abstract

In this thesis, we assume flat FRW model to discuss cosmic evolution of the accelerating universe in the framework of dynamical Chern-Simons modi fied gravity in interacting scenario. We analyze the interaction term which calculates the action of interaction between dark matter and dark energy. We examine thermodynamically an extra driving term for a flat universe by applying Sharma Mittal entropy rather than Bekenstein-Hawking en tropy to Padmanabhan’s holographic equipartition law. Deviating from the Bekenstein-Hawking entropy by using holographic equipartition law, we generate an extra driving term in the acceleration equation. We construct two models by using parametrization of equation of state parameter in the redshift. This parametrization may be a Taylor series extension in the redshift, a Taylor series extension in the scale factor or any other general parametrization of ω. We explore various cosmological parameters such as deceleration parameter, squared speed of sound, Om diagnostic and statefinder via graphical behavior