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arXiv 1709.00646astro-ph.CO
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$H(z)$数据不确定性的贝叶斯校正

Bayesian correction of $H(z)$ data uncertainties

J. F. Jesus, T. M. Gregório, F. Andrade-Oliveira, R. Valentim, C. A. O. Matos

摘要:

我们从文献中收集了41个$H(z)$数据,并使用它们来约束O $Λ$ CDM和平坦$Λ$ CDM参数。我们发现,现有的$H(z)$遭受不确定性高估,并提出了贝叶斯方法来减少它们。由于这种方法,仅使用$H(z)$,我们发现,在O $Λ$ CDM的上下文中,$H_0=69.5\pm2.5\mathrm{\,km\,s^{-1}Mpc^{-1}}$,$Ω_m=0.242\pm0.036$和$Ω_Λ=0.68\pm0.14$。在平面$Λ$ CDM模型的背景下,我们发现了$H_0=70.4\pm1.2\mathrm{\,km\,s^{-1}Mpc^{-1}}$和$Ω_m=0.256\pm0.014$。这相当于在两种情况下与未校正的分析相比,不确定性降低高达30%。

英文摘要:

We compile 41 $H(z)$ data from literature and use them to constrain O$Λ$CDM and flat $Λ$CDM parameters. We show that the available $H(z)$ suffers from uncertainties overestimation and propose a Bayesian method to reduce them. As a result of this method, using $H(z)$ only, we find, in the context of O$Λ$CDM, $H_0=69.5\pm2.5\mathrm{\,km\,s^{-1}Mpc^{-1}}$, $Ω_m=0.242\pm0.036$ and $Ω_Λ=0.68\pm0.14$. In the context of flat $Λ$CDM model, we have found $H_0=70.4\pm1.2\mathrm{\,km\,s^{-1}Mpc^{-1}}$ and $Ω_m=0.256\pm0.014$. This corresponds to an uncertainty reduction of up to 30\% when compared to the uncorrected analysis in both cases.

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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