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arXiv 2409.04027astro-ph.COgr-qc
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原初反弹-暴胀场景以缓解宇宙学张力与透镜异常

Primordial Bounce-Inflation Scenario to Alleviate Cosmological Tensions and Lensing Anomaly

Hao-Hao Li, Xin-zhe Zhang, Taotao Qiu

AI总结:

本文提出原初反弹-暴胀场景,通过拟合 Planck 2018 和 SPT3G 数据缓解哈勃张力和 S8 张力,并在扩展模型中使哈勃张力降至约 3σ 水平、消除 S8 张力。

摘要:

我们提出一种原初场景,以缓解宇宙学张力,即哈勃($H_0$)张力和 $S_8$ 张力。基于平坦 $Λ$CDM,反弹-暴胀(BI)场景在使用 \texttt{Planck 2018} 数据集时给出结果 $H_0 = 68.60^{+0.40}_{-0.45} \\, \text{km}/\text{s}/\text{Mpc}$,$S_8 = 0.806 \pm 0.011$;在使用 \texttt{Planck 2018} + \texttt{SPT3G} 数据集时给出 $H_0 = 68.96 \pm 0.38 \\, \text{km}/\text{s}/\text{Mpc}$,$S_8 = 0.797\pm 0.010$。这些结果略微降低了宇宙学张力。我们还考虑了一个扩展的 $Λ$CDM 模型,即 $Λ$CDM (BI)+$A_L$,其中 $A_L$ 是引力透镜振幅。由 \texttt{Planck 2018} 数据集拟合的结果为 $H_0 = 69.38 \pm 0.49 \\, \text{km}/\text{s}/\text{Mpc}$,$S_8 = 0.774 \pm 0.014$;由 \texttt{Planck 2018} + \texttt{SPT3G} 数据集拟合的结果为 $H_0 = 69.49 \pm 0.45 \\, \text{km}/\text{s}/\text{Mpc}$,$S_8 = 0.771^{+0.013}_{-0.012}$,这些结果将哈勃张力降低到约 $3σ$ 水平,并显示不存在 $S_8$ 张力。$A_L \approx 1.1$ 小于在 \texttt{Planck 2018} 数据集约束下暴胀场景的结果。此外,反弹-暴胀场景的谱指数 $n_s$ 约为 $0.98$,具有趋向 Harrison-Zel'dovich 谱的趋势。

英文摘要:

We put forward a primordial scenario to alleviate cosmological tensions, i.e. Hubble ($H_0$) tension and $ S_8 $ tension. Based on flat $Λ$CDM, the Bounce-Inflation (BI) scenario gives the results that $ H_0 = 68.60^{+0.40}_{-0.45} \, \text{km}/\text{s}/\text{Mpc}$, $ S_8 = 0.806 \pm 0.011 $ by using \texttt{Planck 2018} data sets and $ H_0 = 68.96 \pm 0.38 \, \text{km}/\text{s}/\text{Mpc}$, $ S_8 = 0.797\pm 0.010 $ by using \texttt{Planck 2018} + \texttt{SPT3G} data sets. These reduce the cosmological tensions slightly. We also take an extended $Λ$CDM model into account, $Λ$CDM (BI)+$A_L$, where $ A_L $ is the gravitational lensing amplitude. The results are $ H_0 = 69.38 \pm 0.49 \, \text{km}/\text{s}/\text{Mpc}$, $ S_8 = 0.774 \pm 0.014 $ fitted by \texttt{Planck 2018} data sets and $ H_0 = 69.49 \pm 0.45 \, \text{km}/\text{s}/\text{Mpc}$, $ S_8 = 0.771^{+0.013}_{-0.012} $ fitted by \texttt{Planck 2018} + \texttt{SPT3G} data sets, which reduce the Hubble tension to $\sim 3σ$ level and show no $S_8 $ tension. The $A_L \approx 1.1$ is smaller than the result of the inflation scenario with a constraint of \texttt{Planck 2018} data sets. Besides, the spectral index of the bounce-inflation scenario $ n_s $ is about $ 0.98 $, with a trend to the Harrison-Zel'dovich spectrum.

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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