Testing for dynamical dark energy models with redshift-space distortions
Testing for dynamical dark energy models with redshift-space distortions
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DOI：
10.1088/1475-7516/2013/01/030
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发表时间：
2012-10
影响因子：
6.4
通讯作者：
S. Tsujikawa;A. D. Felice;J. Alcaniz
中科院分区：
文献类型：
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作者：
S. Tsujikawa;A. D. Felice;J. Alcaniz
星系功率谱的红移空间畸变可以用来测量物质密度扰动的增长率δm。对于广义相对论中的动力学暗能量模型，我们提供了一个方便的f（z）σ8（z）的解析公式，表示为红移z的函数，其中f = dln δm/dln a（a是宇宙学尺度因子），σ8是在8 h−1 Mpc尺度下的过密度的均方根振幅。我们的公式可以应用于不完美流体，quintessence和k-essence的模型，只要暗能量状态方程w没有显着变化，声速不小于1。我们还将观测约束暗能量模型的常数w和跟踪的精髓，从最近的数据红移空间扭曲。
The red-shift space distortions in the galaxy power spectrum can be used to measure the growth rate of matter density perturbations δm. For dynamical dark energy models in General Relativity we provide a convenient analytic formula of f(z)σ8(z) written as a function of the redshift z, where f = dln δm/dln a (a is the cosmological scale factor) and σ8 is the rms amplitude of over-density at the scale 8 h−1 Mpc. Our formula can be applied to the models of imperfect fluids, quintessence, and k-essence, provided that the dark energy equation of state w does not vary significantly and that the sound speed is not much smaller than 1. We also place observational constraints on dark energy models of constant w and tracking quintessence from the recent data of red-shift space distortions.