统一的暗能量热力学：变化的w和-1-交叉
Unified dark energy thermodynamics: varying w and the -1-crossing
摘要：
我们以统一的、一般的方式研究了具有任意变化状态方程参数w（a）的暗能量的热力学性质。我们发现，所有的量是良好定义的，并定期为每个w（a），包括在-1-交叉，与温度是负的幻影区（w（a）<-1）和正的精华一（w（a）>-1）。密度和熵总是正值，而化学势可以是任意的。在-1-交叉处，温度和化学势都为零。温度负性只能在量子框架中解释。所有量在-1交叉处的规律性行为导致这样的结论，即这样的交叉不对应于相变，而是对应于平滑交叉。
英文摘要：
We investigate, in a unified and general way, the thermodynamic properties of dark energy with an arbitrary, varying equation-of-state parameter w(a). We find that all quantities are well defined and regular for every w(a), including at the -1-crossing, with the temperature being negative in the phantom regime (w(a)<-1) and positive in the quintessence one (w(a)>-1). The density and entropy are always positive while the chemical potential can be arbitrary. At the -1-crossing, both temperature and chemical potential are zero. The temperature negativity can only be interpreted in the quantum framework. The regular behavior of all quantities at the -1-crossing, leads to the conclusion that such a crossing does not correspond to a phase transition, but rather to a smooth cross-over.
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