On the tension between growth rate and CMB data

Abstract

We analyze the claimed tension between redshift space distorsions measurements of $f(z){\sigma }_8(z)$ and the predictions of standard $\Lambda$CDM (Planck 2015 and 2018) cosmology. We consider a dataset consisting of 17 data points extending up to redshift $z=1.52$ and corrected for the Alcock-Paczynski effect. Thus, calculating the evolution of the growth factor in a $w$CDM cosmology, we find that the tension for the best fit parameters $w$, ${\Omega }_m$ and ${\sigma }_8$ with respect to the Planck 2018 $\Lambda$CDM parameters is below $2\sigma$ in all the marginalized confidence regions.

arXiv comment6 pages, 4 figures. Final version to appear in Eur. Phys. J. C

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• Hints of a Local Matter Underdensity or Modified Gravity in the Low $z$ Pantheon data
• $\Lambda$CDM Tensions: Localising Missing Physics through Consistency Checks
• Inferring $S_8(z)$ and $\gamma (z)$ with cosmic growth rate measurements using machine learning
• $S_8$ increases with effective redshift in $\Lambda$CDM cosmology
• Cosmological perturbations in the Tsallis holographic dark energy scenarios
• The Hubble Tension, The $M$ Crisis of Late Time $H(z)$ Deformation Models and the Reconstruction of Quintessence Lagrangians
• J-PAS: Forecasts for dark matter - dark energy elastic couplings
• Updating constraints on phantom crossing $f(T)$ gravity