Thermodynamical properties of dark energy

Details Thermodynamical properties of dark energy Thermodynamical properties of dark energy

2006-11-30

arxiv.org/abs/gr-qc/0611155v3

Phys.Rev.D75:123516,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

5 two column pages, 2 figures; v2: discussion on thermal equilibrium with the horizon is added, v3: minor corrections, publish

Scientific paper

10.1103/PhysRevD.75.123516

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.

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