论文标题
黑暗能量兼容的黑色能量参数
Barotropic fluid compatible parametrizations of dark energy
论文作者
论文摘要
状态参数方程作为比例因子或红移的函数的参数化在暗能量建模中经常使用。本文研究的问题是，文献中提出的参数是否与暗能量是正压流体兼容。这种兼容性的测试基于声速的功能形式，而声音速度的功能形式直接来自状态参数方程的函数。声音平方的速度应在0和光速度之间的要求提供了使用分析和数值方法对模型参数的限制。发现这种基本要求消除了大量的参数化，因为正压流体暗能量模型，并对其他暗能量参数的参数施加了强烈的限制。
Parametrizations of Equation of state parameter as a function of the scale factor or redshift are frequently used in dark energy modeling. The question investigated in this paper is if parametrizations proposed in the literature are compatible with the dark energy being a barotropic fluid. The test of this compatibility is based on the functional form of the speed of sound squared, which for barotropic fluid dark energy follows directly from the function for the Equation of state parameter. The requirement that the speed of sound squared should be between 0 and speed of light squared provides constraints on model parameters using analytical and numerical methods. It is found that this fundamental requirement eliminates a large number of parametrizations as barotropic fluid dark energy models and puts strong constraints on parameters of other dark energy parametrizations.
