arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2202.05973astro-ph.CO
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作为回望时间函数的宇宙学标度因子的模型无关重建

Model-independent reconstruction of the cosmological scale factor as a function of lookback time

Jian-Chen Zhang, Jing Zheng, Tong-Jie Zhang

摘要:

本文提出了一种从观测哈勃参数数据(OHD)中重建回视时间标度因子的模型无关方法。该方法不依赖于动力学模型,仅基于Friedmann-Robertson-Walker度规。我们还计算了重建过程中误差的传播。重建数据的误差主要来自梯形法则近似和OHD的不确定性。在无量纲化标准方法下,讨论了原始OHD数据和重建a-t数据的模型判别能力。a-t数据比H-z数据通过比较宇宙学模型之间的变异系数,能更清楚地反映宇宙学模型之间的差异。最后,我们加入50个模拟的H(z)数据来估计未来观测的影响。未来更多的哈勃测量将有助于更准确地限制宇宙学参数。

英文摘要:

We present a model-independent method of reconstructing scale factor against lookback time from the Observational Hubble parameter Data (OHD). The reconstruction method is independent of dynamical models and is only based on the Friedmann-Robertson-Walker metric. We also calculate the propagation of error in the reconstruction process. The reconstruction data errors mainly come from trapezoidal rule approximation and the uncertainty from OHD. Furthermore, the model discrimination ability of original OHD and reconstructed a-t data is discussed under a dimensionless standard method. a-t data can present the differences between cosmology models more clearly than H-z data by comparing their coefficients of variations. Finally, we add fifty simulated H(z) data to estimate the influence of future observation. More Hubble measurements in the future will help constrain cosmological parameters more accurately.

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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