On the tension between growth rate and CMB data
Abstract
We analyze the claimed tension between redshift space distorsions measurements of f(z)σ8(z) and the predictions of standard (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 wCDM cosmology, we find that the tension for the best fit parameters w, m and σ8 with respect to the Planck 2018 parameters is below 2σ in all the marginalized confidence regions.
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