Thermodynamics of Homogeneous and Isotropic Universe for Various Dark Energy Conditions
DOI:
https://doi.org/10.26565/2312-4334-2025-1-04Keywords:
FRW Model, Homogeneous, Thermodynamics, Pantheon, Dark energyAbstract
The thermodynamic properties of homogeneous and isotropic universe for various dark energy conditions with decaying cosmological term Λ(t) are investigated. To obtain the explicit solution of Einstein’s field equations, we have considered a linearly varying deceleration parameter in the form of q =-αt + m - 1 with α and m as scalar constants. We have constrained the model parameters H0 and m as 68.495 km/s/Mpc and 1.591 respectively by bounding the derived model with combined pantheon compilation of SN Ia and H(z) data sets. Furthermore, we have studied the time varying dark energy states for two different assumptions i) Λ = Λ1t-2 and ii) Λ ꭀ [R(t)]−2n. For a specific assumption, our models indicate a dark energy like behaviour in in open, flat and closed space - time geometry. The temperature and entropy density of the model remain positive for both the cases i) Λ = Λ1t-2 and ii) Λ ꭀ [R(t)]−2n. Some physical properties of the universe are also discussed.
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