Thermodynamics of the Universe Filled with Perfect Fluid Having Variable Equation of State

We study the thermodynamics of the universe containing perfect fluid with equation of state $p=ωρ,ω$ is variable. Here we choose $ω$ to be a function of the red shift variable $z$ and four different choices of $ω$ has been investigated. Also the laws of thermodynamics are examined considering the universe bounded by the horizon (apparent) as a thermodynamical system.

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