Entropy Growth and the Dark Energy Equation of State
Wilfried Buchmuller, Joerg Jaeckel
Abstract
We revisit the conjecture of a generalized second law of thermodynamics which states that the combined entropy of matter and horizons must grow. In an expanding universe a generalized second law restricts the equation of state. In particular, it conflicts with long phases of a phantom, w<-1, equation of state.
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