Thermodynamics of FRW Universe in Various Theories of Gravity Inspired by Entropy Corrections

Abstract

In this thesis, we discuss the thermodynamical analysis for gravitationally induced particle creation scenario in the framework of DGP braneworld and Chern-Simons gravity. For this purpose, we consider apparent horizon as the boundary of the universe. We take three types of entropy such as Bakenstein, logarithmic corrected and power law corrected entropies with ordinary creation rate Γ. We analyze the first law and generalized second law of thermodynamics for these entropies which hold under some con straints. The behavior of total entropy in each case is also discussed which implies the validity of generalized second law of thermodynamics. Also, we check the thermodynamical equilibrium condition for two phases of creation rate Γ, that is constant and variable and found its vitality in all cases of entropy