$c_s^2(w)$正压流体模式的动力学k-本质描述
Purely kinetic k-essence description of $c_s^2(w)$ barotropic fluid models
摘要：
物理动力学k-本质模型在文献中已经被证明是暗能量或暗物质-暗能量统一的正压流体模型的场论等价物。在正压流体的声速平方作为其状态方程参数的函数的建模框架中，给出了获得等效纯动力学k-本质模型的拉格朗日密度的系统过程。由于这种建模方法从声速开始，因此可以构建纯动力学k本质模型，其中声速与观测约束一致。取决于正压流体的声速平方的函数形式的选择，解析容易处理的例子的解决方案的纯动力学k-本质拉格朗日密度的参数和封闭的形式。
英文摘要：
Purely kinetic k-essence models have been shown in the literature to be a field theory equivalent of barotropic fluid models of dark energy or dark matter-dark energy unification. In the modeling framework where the speed of sound squared of a barotropic fluid is modeled as a function of its Equation of State parameter, a systematic procedure of obtaining the Lagrangian density of an equivalent purely kinetic k-essence model is presented. As this modeling approach starts from the speed of sound, purely kinetic k-essence models can be constructed for which the speed of sound is in agreement with the observational constraints. Depending on the chosen functional form for the barotropic fluid speed of sound squared, analytically tractable examples of solutions for the purely kinetic k-essence Lagrangian density in parametric and closed form are obtained.
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