论文标题

关于Hubble常数的演变,SNE IA Pantheon样品和Baryon声学振荡:2030年GRB-Cosomology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

论文作者

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

论文摘要

在与本地(Cepheids和Supernovae IA,Sne IA)和高Z探针(Planck数据获得的CMB)观察到的值之间,在Hubble常数($ H_0 $)中的4到6 $σ$之间的差异仍然挑战天体物理学和世界学社区。先前的分析表明,哈勃常数有一个演变,将其缩放为$ f(z)= \ Mathcal {h} _ {0}/(1+z)^η$,其中$ \ MATHCAL {H} _0 $ is $ h_ {0}(z = 0)(z = 0)(z = 0)和$η$ IS vartolutionar parameter。在这里,我们调查了这种进化是否仍然使用了Pantheon样品和BAO中收集的SNE IA。我们假设$ h_ {0} = 70 \ textrm {km s}^{ - 1} \ textrm {mpc}^{ - 1} $作为本地值,并将万神殿分为3个垃圾箱,分为3个垃圾箱,以增加红色Shshift的值。与我们以前的分析相似,但同时改变了两个宇宙学参数($ H_0 $,$ω_{0M} $中的$λ$ CDM型号和$ h_0 $,$ h_0 $,$ w_a $,$ w_ {0} w_ {0} w_ {a} $ cdm型号)随后,$ h_0 $的值与型号$ f(z)$一起安装。我们的结果表明,在此样本中仍然可以看到$η\ sim10^{ - 2} $的趋势下降。 $η$系数在$ w_ {0} w_ {a} $ cdm型号的$λ$ cdm型号的2.0 $σ$中达到零。这种趋势,即使不是由于统计波动,可以通过隐藏的天体物理偏差(例如拉伸演变的效果)来解释这种趋势,或者需要新的理论模型,可能的主张是修改的重力理论,$ f(r)$ $ [...] $。这项工作也是一项准备事项,以了解Redshift的合并探针如何显示$ H_0 $的演变,以及在GRB宇宙学上模拟的当前状态是什么,以获得$ω_{0m} $的不确定性,与通过IA实现的那些相当。

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.

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