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arXiv 1210.4239astro-ph.COgr-qchep-phhep-th
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具有红移空间畸变的动力学暗能量模型的检验

Testing for dynamical dark energy models with redshift-space distortions

Shinji Tsujikawa, Antonio De Felice, Jailson Alcaniz

摘要:

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Δ_m。对于广义相对论中的动力学暗能量模型,我们给出了f(z)sigma_8(z)的一个方便的解析公式,表示为红移z的函数,其中f=d ln delta_m/d ln a(a是宇宙学尺度因子),sigma_8是在8 h^{-1} Mpc尺度下的过密度的均方根振幅。只要暗能量状态方程w不发生显著变化,声速不小于1,我们的公式就可以应用于不完美流体、精粹和k-本质的模型。我们还将观测约束的暗能量模型的常数w和跟踪的精髓,从最近的数据红移空间扭曲。

英文摘要:

The red-shift space distortions in the galaxy power spectrum can be used to measure the growth rate of matter density perturbations delta_m. For dynamical dark energy models in General Relativity we provide a convenient analytic formula of f(z) sigma_8(z) written as a function of the redshift z, where f=d ln delta_m/d ln a (a is the cosmological scale factor) and sigma_8 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.

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