论文标题
使用宇宙天文钟对宇宙学参数的模型无关估计
Model-independent estimation of the cosmography parameters using cosmic chronometers
论文作者
论文摘要
通过宇宙天元计的宇宙扩展率的测量被证明是一种理解宇宙历史的新方法。尽管它可以直接确定不同红移的哈勃参数，但它遭受了潜在的系统不确定性。在这项工作中，我们分析了有或没有系统不确定性的最新宇宙计时仪数据，并研究了它们如何影响结果。我们在模型依赖性和独立方法中进行分析，以避免任何可能的模型偏差。在与模型有关的方法中，我们考虑$λ$ CDM，WCDM和CPL模型。另一方面，由于高斯工艺为研究数据提供了独特的工具，包括非对抗协方差矩阵，因此我们的模型无关分析基于高斯过程。
Measurement of the universe expansion rate through the cosmic chronometers proves to be a novel approach to understanding cosmic history. Although it provides a direct determination of the Hubble parameters at different redshifts, it suffers from underlying systematic uncertainties. In this work, we analyze the recent cosmic chronometer data with and without systematic uncertainties and investigate how they affect the results. We perform our analysis in both model-dependent and independent methods to avoid any possible model bias. In the model-dependent approach, we consider the $Λ$CDM, wCDM and CPL models. On the Other hand, since the Gaussian process provides a unique tool to study data including a non-diagonal covariance matrix, our model-independent analysis is based on the Gaussian process.
