G-本质模型中暗能量状态方程的宇宙演化
Cosmological evolution of equation of state for dark energy in G-essence models
摘要：
研究了g-本质模型中暗能量状态方程的宇宙学演化，其中暗能量的作用由标量场和费米子场的正则动力学项的函数描述.我们检查g-本质模型实现的幻影分界线的交叉$w_{\mathrm{DE}}=-1$，以及模型中，宇宙总是停留在非幻影（quintessence）阶段（$w_{\mathrm{DE}}>-1$）。特别是，我们发现一个明确的g-本质模型的交叉从非幻影阶段的幻影（$w_{\mathrm{DE}}<-1$）。这种转变行为与最近的观测数据分析一致。
英文摘要：
We explore the cosmological evolution of equation of state (EoS) for dark energy in g-essence models, the action of which is described by a function of both the canonical kinetic term of both the scalar and fermionic fields. We examine g-essence models with realizing the crossing of the phantom divide line of $w_{\mathrm{DE}}=-1$ as well as the models in which the universe always stays in the non-phantom (quintessence) phase ($w_{\mathrm{DE}}>-1$). In particular, we find an explicit g-essence model with the crossing from the non-phantom phase to the phantom one ($w_{\mathrm{DE}}<-1$). This transition behavior is consistent with the recent observational data analyses.
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