arXiv 2006.018792020-06-02gr-qcastro-ph.COhep-th

粘性暗流体宇宙中$H_{0}$张力问题的分析

An analysis of the $H_{0}$ tension problem in a universe with a viscous dark fluid

Emilio Elizalde, Martiros Khurshudyan, Sergei D. Odintsov, Ratbay Myrzakulov

备注：: 13 pages, 4 figures
DOI：: 10.1103/PhysRevD.102.123501

摘要：

本文讨论了两种能自然地解决$H_{0}$张力问题的非均匀单流体宇宙模型。该分析基于使用生成过程的贝叶斯机器学习方法。所采用的方法允许通过使用模型本身来约束每个模型的自由参数。观测值被认为是哈勃参数，从生成过程中获得。利用我们的方法的全部优点，模型被限制为两个红移范围。即，首先使用$z\in [0,2.5]$上的模拟$H(z)$数据完成此操作，从而覆盖已知的$H(z)$观察数据，这些数据对于验证拟合结果最有帮助。然后，为了扩展到最近正在进行的和未来计划的任务所覆盖的红移范围，模型也被限制在$z\in[0,5]$范围内。对于这个扩展的红移范围的结果的全面验证将不得不等待不久的将来，当更高的红移$H(z)$数据变得可用。这使得我们的模型完全可证伪。最后，我们这里的第二个模型能够解释$z=2.34$上$H(z)$的BOSS报告值。

英文摘要：

In this paper, two inhomogeneous single fluid models for the Universe, which are able to naturally solve the $H_{0}$ tension problem, are discussed. The analysis is based on a Bayesian Machine Learning approach that uses a generative process. The adopted method allows to constrain the free parameters of each model by using the model itself, only. The observable is taken to be the Hubble parameter, obtained from the generative process. Using the full advantages of our method, the models are constrained for two redshift ranges. Namely, first this is done with mock $H(z)$ data over $z\in [0,2.5]$, thus covering known $H(z)$ observational data, which are most helpful to validate the fit results. Then, aiming to extend to redshift ranges to be covered by the most recent ongoing and future planned missions, the models are constrained for the range $z\in[0,5]$, too. Full validation of the results for this extended redshift range will have to wait for the near future, when higher redshift $H(z)$ data become available. This makes our models fully falsifiable. Finally, our second model here is able to explain the BOSS reported value for $H(z)$ at $z=2.34$.

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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