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arXiv 2106.09595astro-ph.CO
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根据CMB数据和$S_8$张力的最小质量引力理论

Minimal theory of massive gravity in the light of CMB data and the $S_8$ tension

Jose C. N. de Araujo, Antonio De Felice, Suresh Kumar, Rafael C. Nunes

摘要:

我们根据$Λ$ CDM宇宙学中处于紧张状态的不同观测数据集研究了最小质量引力理论(MTMG)。特别地,我们首次用Planck-CMB数据分析了MTMG模型,以及这些精确测量是如何影响理论的自由参数的。MTMG模型可以影响大角度尺度下的CMB功率谱,并导致物质功率谱的振幅受到抑制。我们发现,在加入Planck-CMB数据后,引力子在68%的置信水平上有一个小的,正的,但非零的质量,从这个角度来看,我们证明了在参数空间$S_8 - Ω_m$中红移空间畸变测量和Planck-CMB数据之间的紧张关系可以在MTMG方案中解决。通过一个强大的和准确的分析,我们发现,在CMB和本地距离阶梯测量之间的$H_0$张力仍然存在,但可以减少到$\sim3.5σ$内MTMG理论。MTMG与CMB的观测结果非常一致,毫无疑问,它可以作为一个可行的候选人之间的其他修改的引力理论。

英文摘要:

We investigate the Minimal Theory of Massive Gravity (MTMG) in the light of different observational data sets which are in tension within the $Λ$CDM cosmology. In particular, we analyze MTMG model, for the first time, with the Planck-CMB data, and how these precise measurements affect the free parameters of the theory. The MTMG model can affect the CMB power spectrum at large angular scales and cause a suppression on the amplitude of the matter power spectrum. We find that on adding Planck-CMB data, the graviton has a small, positive, but non-zero mass at 68\% confidence level, and from this perspective, we show that the tension between redshift space distortions measurements and Planck-CMB data in the parametric space $S_8 - Ω_m$ can be resolved within the MTMG scenario. Through a robust and accurate analysis, we find that the $H_0$ tension between the CMB and the local distance ladder measurements still remains but can be reduced to $\sim3.5σ$ within the MTMG theory. The MTMG is very well consistent with the CMB observations, and undoubtedly, it can serve as a viable candidate amongst other modified gravity theories.

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