Quantifying the S8 tension with the Redshift Space Distortion data set

David Benisty

Research output: Contribution to journalArticlepeer-review

64 Scopus citations

Abstract

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
Volume31
DOIs
StatePublished - 1 Jan 2021

Keywords

  • Dark matter
  • σ tension

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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