Quantifying the S8 tension with the Redshift Space Distortion data set

David Benisty

doi:10.1016/j.dark.2020.100766

Quantifying the S₈ tension with the Redshift Space Distortion data set

David Benisty

Department of Physics

Research output: Contribution to journal › Article › peer-review

83 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 language	English
Article number	100766
Journal	Physics of the Dark Universe
Volume	31
DOIs	https://doi.org/10.1016/j.dark.2020.100766
State	Published - 1 Jan 2021

Keywords

Dark matter
σ tension

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.1016/j.dark.2020.100766

Cite this

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title = "Quantifying the S8 tension with the Redshift Space Distortion data set",

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.",

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AB - 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.

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