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Viscous Cosmology and Thermodynamics of Apparent Horizon in Modified Friedman-Robertson-Walkers Universe |
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| Authors: | J Sadeghi J Naji H Vaez B Khanpour |
| Institution: | 1. Sciences Faculty, Department of Physics, Ayattolah Amoli, Azad University, P.O.Box 678, Amol, Iran 2. Faculty of Sciences, Departments of Physics, Ilam University, P.O.Box 69315-516, Ilam, Iran 3. Young Researchers Club, Ayatollah Amoli Branch, Islamic Azad University, Amol, Iran |
| Abstract: | In this paper, we write modified Friedman-Robertson-Walkers (FRW) equation in the form of first law of thermodynamics at the apparent horizon. We consider the universe filled with the viscous fluid. Here we employ the general expression of temperature gravity and entropy at the apparent horizon of FRW universe and obtain the generalized first law of thermodynamics at the special condition for the modified FRW equation. The generalized first law of thermodynamics help us to arrange the α 1, α 2, β 1 and β 2 in modified Friedman-Robertson-Walkers equation. |
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