Abstract
This paper deals with the thermodynamic properties of a phantom field in a flat Friedmann–Robertson–Walker universe. General expressions for the temperature and entropy of a general dark-energy field with equation of state p = ω ρ are derived from which we have deduced that, whereas the temperature of a cosmic phantom fluid ( ω < − 1 ) is definite negative, its entropy is always positive. We interpret that result in terms of the intrinsic quantum nature of the phantom field and apply it to (i) attain a consistent explanation for some recent results concerning the evolution of black holes which,induced by accreting phantom energy, gradually loss their mass to finally vanish exactly at the big rip, and (ii) introduce the concept of cosmological information and its relation with life and the anthropic principle. Some quantum statistical-thermodynamic properties of the quantum field are also considered that include a generalized Wien law and the prediction of some novel phenomena such as the stimulated absorption of phantom energy and the anti-laser effect.
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