arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.08713astro-ph.CO
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Ia型超新星、重子声学振荡和引力透镜时间延迟的$H_0$重建

$H_0$ Reconstruction with Type Ia Supernovae, Baryon Acoustic Oscillation and Gravitational Lensing Time-Delay

Meng-Zhen Lyu, Balakrishna S. Haridasu, Matteo Viel, Jun-Qing Xia

摘要:

在平坦$Λ$ CDM模型的背景下,在局部距离阶梯值和\emph{Planck}宇宙微波背景测量之间存在持续的$H_0$ -张力,现在处于超过$\gtrsim 4σ$水平。利用三个低红移距离探测器的最新重子声学振荡、Ia型超新星和四个引力透镜时延观测数据,以独立于宇宙模型的方式重建了$H(z)$.我们采用$H(z)$的一般参数模型,并假设在拖曳时期,$r_{\mathrm s}$,从\emph{Planck}测量的声音地平线上的高斯先验。利用Pantheon SN Ia和BAO数据重建的$H_0$与\emph{Planck}平坦$Λ$ CDM值一致。当纳入GLTD数据时,$H_0$轻度增加,但仍与$\sim 2.5σ$水平的当地测量值不一致。我们的重建是盲目的暗部门在低红移,我们重申了早期的主张,哈勃紧张是不可能解决的低红移宇宙的能量预算修改。结合DESI和LSST的GLTD数据,我们预测了未来真实模拟BAO数据的约束能力,预计$\sim 38\%$将改善所推断的$H_0$的不确定性,使其达到$σ_{H_0} \approx 0.56$不确定性水平。

英文摘要:

There is a persistent $H_0$-tension, now at more than $\gtrsim 4σ$ level, between the local distance ladder value and the \emph{Planck} cosmic microwave background measurement, in the context of flat $Λ$CDM model. We reconstruct $H(z)$ in a cosmological-model-independent way using three low-redshift distance probes including the latest data from baryon acoustic oscillation, Type Ia supernova and four gravitational lensing Time-Delay observations. We adopt general parametric models of $H(z)$ and assume a Gaussian prior on the sound horizon at drag epoch, $r_{\mathrm s}$, from \emph{Planck} measurement. The reconstructed $H_0$ using Pantheon SN Ia and BAO data are consistent with the \emph{Planck} flat $Λ$CDM value. When including the GLTD data, $H_0$ increases mildly, yet remaining discrepant with the local measurement at $\sim 2.5σ$ level. Our reconstructions being blind to the dark sectors at low redshift, we reaffirm the earlier claims that the Hubble tension is not likely to be solved by modifying the energy budget of the low-redshift universe. We further forecast the constraining ability of future realistic mock BAO data from DESI and GLTD data from LSST, combining which, we anticipate that the uncertainty of the inferred $H_0$ would be improved by $\sim 38\%$, reaching $σ_{H_0} \approx 0.56$ uncertainty level.

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