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arXiv 1404.2168astro-ph.CO
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哈勃参数的涨落

Fluctuation of the Hubble parameter

Xi-Bin Li, Hao-Feng Qin, Zhi-Song Zhang, Tong-Jie Zhang

摘要:

研究了扰动Friedmann宇宙中的Hubble参数$H(z)$,得到了扰动Hubble参数$H(z,\textbf{n})$的表达式.我们利用暴胀过程中的初始谱和Barclay传递函数导出了哈勃参数的功率谱。在冷暗物质(CDM)宇宙的情况下,我们得到了一个半解析表达式。与光度距离一样,哈勃参数谱也是确定某些宇宙学参数的有用观测工具。此外,我们还指出,哈勃参数的功率谱可以用来检验二阶小尺度涨落是否加速了膨胀。

英文摘要:

We study the Hubble parameter $H(z)$ in perturbed Friedmann universe and obtain an expression of the perturbed Hubble parameter $H(z,\textbf{n})$. We derive the Hubble parameter power spectrum by using the initial spectrum during inflation and the Bardeen transfer function. We obtain a semi-analytical expression in the case of cold dark matter (CDM) universe. Similar with luminosity distance, the Hubble parameter spectrum is suggested to be an useful observational tool to determine some cosmological parameters. In addition, we show that the Hubble parameter power spectrum could be used to check whether the expansion is accelerated by the second order small scale fluctuation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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