Quantifying the S8 tension with the Redshift Space Distortion data set

David Benisty

Research output: Contribution to journalArticlepeer-review

64 Scopus citations


One problem of the ΛCDM model is the tension between the S8 found in Cosmic Microwave Background (CMB) experiments and the smaller one obtained from large-scale observations in the late Universe. The σ8 quantifies the relatively high level of clustering. Likelihood analyses of the Redshift Space Distortion (RSD) selected data set yields: S8=0.700−0.037+0.038. 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 S8=0.707−0.085+0.085,0.701−0.089+0.089, and 0.731−0.062+0.063 for different kernels. The tension reduces and being smaller then 1.5σ. With future measurements the tension may be reduced, but the possibility the tension is real is a plausible situation.

Original languageEnglish
Article number100766
JournalPhysics of the Dark Universe
StatePublished - 1 Jan 2021


  • Dark matter
  • σ tension

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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