Reconstructing f(R) modified gravity with dark energy parametrization
Reconstructing f(R) modified gravity with dark energy parametrization
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DOI：
10.1088/1742-6596/490/1/012087
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发表时间：
2014-03
期刊：
影响因子：
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通讯作者：
M. Morita;H. Takahashi
中科院分区：
文献类型：
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作者：
M. Morita;H. Takahashi
我们演示了用晚时间加速宇宙膨胀重建f(R)修正引力理论。从场方程导出了拉格朗日密度的二阶微分方程，并在两种情况下作为宇宙标度因子的函数进行了求解。首先，为了简单起见，我们从wCDM宇宙模型的情况开始，其中暗能量状态方程参数w是常数。接下来，我们将该方法扩展到参数w与纪元相关且表示为Chvallier-Polarski-Linder参数化的情况。这样我们就可以用暗能量参数来表示f(R)修正引力理论的拉格朗日密度。
We demonstrate the reconstruction of f(R) modified gravity theory with late-time accelerated cosmic expansion. A second-order differential equation for Lagrangian density is obtained from the field equation, and is solved as a function of the cosmic scale factor in two cases. First we begin with the case of a wCDM cosmological model, in which a dark-energy equation-of-state parameter w is constant, for simplicity. Next we extend the method to a case in which the parameter w is epoch-dependent and is expressed as the Chevallier-Polarski-Linder parametrization. Thus we can represent Lagrangian density of f(R) modified gravity theory in terms of dark energy parameters.