论文标题
使用高斯工艺方法对宇宙曲率进行测量
Measurement on the cosmic curvature using the Gaussian process method
论文作者
论文摘要
通货膨胀预测宇宙在空间上是平坦的。宇宙微波背景各向异性的Planck 2018测量值以超过2 $σ$置信度的水平有利于空间封闭的宇宙。我们使用模型独立的方法研究宇宙曲率的问题。该方法使用高斯工艺方法从宇宙天元器数据中重建了哈勃参数$ h（z）$。 The distance modulus is then calculated with the reconstructed function $H(z)$ and fitted by type Ia supernovae data.结合了宇宙天文序列和类型的IA超新星数据，我们获得了$ω__{k0} h^2 = 0.102 \ pm 0.066 $，这与在2 $σ$置信度下的空间平坦宇宙一致。通过使用拟议的新型模型方法将红移空间扭曲数据添加到IA类型超新星数据中，我们获得了$ω__{K0} h^2 = 0.117^{+0.058} _ { - 0.045} $，并且没有偏离$λ$ CDM模型的偏差。
Inflation predicts that the Universe is spatially flat. The Planck 2018 measurements of the cosmic microwave background anisotropy favour a spatially closed universe at more than 2$σ$ confidence level. We use model independent methods to study the issue of cosmic curvature. The method reconstructs the Hubble parameter $H(z)$ from cosmic chronometers data with the Gaussian process method. The distance modulus is then calculated with the reconstructed function $H(z)$ and fitted by type Ia supernovae data. Combining the cosmic chronometers and type Ia supernovae data, we obtain $Ω_{k0}h^2=0.102\pm 0.066$ which is consistent with a spatially flat universe at the 2$σ$ confidence level. By adding the redshift space distortions data to the type Ia supernovae data with a proposed novel model independent method, we obtain $Ω_{k0}h^2=0.117^{+0.058}_{-0.045}$ and no deviation from $Λ$CDM model is found.
