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arXiv 2201.09848astro-ph.CO
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超新星Ia万神殿样品和重子声学振荡对哈勃常数的演化:2030年GRB宇宙学的可行性研究

On the evolution of the Hubble constant with the SNe Ia Pantheon Sample and Baryon Acoustic Oscillations: a feasibility study for GRB-cosmology in 2030

Maria Giovanna Dainotti, Biagio De Simone, Tiziano Schiavone, Giovanni Montani, Enrico Rinaldi, Gaetano Lambiase, Malgorzata Bogdan, Sahil Ugale

摘要:

局部(造父变星和超新星Ia,SNe Ia)和高z探测器(由普朗克数据获得的CMB)观测值之间的哈勃常数($H_0$)差异为4至6,这仍然是天体物理学和宇宙学界的挑战。先前的分析表明,哈勃常数有一个演变,其尺度为$f(z)=\mathcal{H}_{0}/(1+z)^η$,其中$\mathcal{H}_0$是$H_{0}(z=0)$,$η$是演变参数。在这里,我们调查,如果这种演变仍然持有通过使用SNe Ia收集的万神殿样本和BAO。我们假设$H_{0}=70 \textrm{km s}^{-1}\textrm{Mpc}^{-1}$作为本地值,并将万神殿分为3个箱,按红移值的递增顺序排列。类似于我们之前的分析,但是同时改变两个宇宙学参数($Λ$ CDM模型中的$H_0$、$Ω_{0m}$和$w_{0}w_{a}$ CDM模型中的$H_0$、$w_a$),对于每个仓,我们实施MCMC分析,获得$H_0$ $[...]$的值。随后,$H_0$的值与模型$f(z)$拟合。我们的结果表明,在该样品中,$η\sim10^{-2}$的下降趋势仍然可见。对于$Λ$ CDM模型,$η$系数在2.0 $σ$达到零,对于$w_{0}w_{a}$ CDM模型,$η$系数在5.8 $σ$达到零。这种趋势,如果不是由于统计波动,可以通过一个隐藏的天体物理学的偏见,如拉伸演化的影响,或它需要新的理论模型来解释,一个可能的命题是修改后的引力理论,$f(R)$ $[...]$。这项工作也是一个准备,以了解如何结合探针仍然显示的$H_0$的红移和什么是伽玛射线暴宇宙学的模拟,以获得的不确定性的$Ω_{0m}$通过SNe Ia取得的进展。

英文摘要:

The difference from 4 to 6 $σ$ in the Hubble constant ($H_0$) between the values observed with the local (Cepheids and Supernovae Ia, SNe Ia) and the high-z probes (CMB obtained by the Planck data) still challenges the astrophysics and cosmology community. Previous analysis has shown that there is an evolution in the Hubble constant that scales as $f(z)=\mathcal{H}_{0}/(1+z)^η$, where $\mathcal{H}_0$ is $H_{0}(z=0)$ and $η$ is the evolutionary parameter. Here, we investigate if this evolution still holds by using the SNe Ia gathered in the Pantheon sample and the BAOs. We assume $H_{0}=70 \textrm{km s}^{-1}\textrm{Mpc}^{-1}$ as the local value and divide the Pantheon into 3 bins ordered in increasing values of redshift. Similar to our previous analysis but varying two cosmological parameters contemporaneously ($H_0$, $Ω_{0m}$ in the $Λ$CDM model and $H_0$, $w_a$ in the $w_{0}w_{a}$CDM model), for each bin we implement a MCMC analysis obtaining the value of $H_0$ $[...]$. Subsequently, the values of $H_0$ are fitted with the model $f(z)$. Our results show that a decreasing trend with $η\sim10^{-2}$ is still visible in this sample. The $η$ coefficient reaches zero in 2.0 $σ$ for the $Λ$CDM model up to 5.8 $σ$ for $w_{0}w_{a}$CDM model. This trend, if not due to statistical fluctuations, could be explained through a hidden astrophysical bias, such as the effect of stretch evolution, or it requires new theoretical models, a possible proposition is the modified gravity theories, $f(R)$ $[...]$. This work is also a preparatory to understand how the combined probes still show an evolution of the $H_0$ by redshift and what is the current status of simulations on GRB cosmology to obtain the uncertainties on the $Ω_{0m}$ comparable with the ones achieved through SNe Ia.

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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