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    A unified picture of cosmological entropy on apparent horizon in F(R, G) gravity
    (World Scientific Publ Co Pte Ltd, 2017) Keskin, Ali Ihsan; Acikgoz, Irfan
    In this study, the validity of the generalized second law of thermodynamics (GSLT) has been investigated in F(R, G) gravity. We consider that the boundary of the universe is surrounded by an apparent horizon in the spatially flat Friedmann-Robertson-Walker (FRW) universe, and we take into account the Hawking temperature on the horizons. The unified solutions of the field equations corresponding to gravity theory have been applied to the validity of the GSLT frame, and in this way, both the solutions have been verified and all the expansion history of the universe has been shown in a unified picture.