Thermodynamical properties of dark energy

Abstract

We have investigated the thermodynamical properties of dark energy. Assuming that the dark energy temperature $T\sim a^{-n}$ and considering that the volume of the Universe enveloped by the apparent horizon relates to the temperature, we have derived the dark energy entropy. For dark energy with constant equation of state $w>-1$ and the generalized Chaplygin gas, the derived entropy can be positive and satisfy the entropy bound. The total entropy, including those of dark energy, the thermal radiation and the apparent horizon, satisfies the generalized second law of thermodynamics. However, for the phantom with constant equation of state, the positivity of entropy, the entropy bound, and the generalized second law cannot be satisfied simultaneously.

arXiv comment5 two column pages, 2 figures; v2: discussion on thermal equilibrium with the horizon is added, v3: minor corrections, published in PRD

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Cited by in corpus (35)

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• Friedmann Equations and Thermodynamics of Apparent Horizons
• Generalized second law of thermodynamics in f(T) gravity
• Thermodynamics and classification of cosmological models in the Horava-Lifshitz theory of gravity
• Thermodynamics in $f(R)$ gravity in the Palatini formalism
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• Making sense of the bizarre behaviour of horizons in the McVittie spacetime
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• The generalized second law of gravitational thermodynamics on the apparent horizon in f(R)-gravity
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• Thermodynamics properties of the dark energy in loop quantum cosmology