Quantifying the $S_8$ tension with the Redshift Space Distortion data set

One problem of the $Λ$CDM model is the tension between the $S_8$ found in Cosmic Microwave Background (CMB) experiments and the smaller one obtained from large-scale observations in the late Universe. The $σ_8$ quantifies the relatively high level of clustering. Bayesian Analysis of the Redshift Space Distortion (RSD) selected data set yields: $S_8 = 0.700^{+0.038}_{-0.037}$. The fit has $3σ$ tension with the Planck 2018 results. With Gaussian processes method a model-independent reconstructions of the growth history of matter in-homogeneity is studied. The fit yields $S_8 = 0.707^{+0.085}_{-0.085}, 0.701^{+0.089}_{-0.089}$, and $0.731^{+0.063}_{-0.062}$ for different kernels. The tension reduces and being smaller then $1.5\, σ$. With future measurements the tension may be reduced, but the possibility the tension is real is a plausible situation.

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