On the tension between growth rate and CMB data

We analyze the claimed tension between redshift space distorsions measurements of $$f(z)\sigma _8(z)$$ and the predictions of standard $$\varLambda $$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 wCDM cosmology, we find that the tension for the best fit parameters w, $$\varOmega _m$$ and $$\sigma _8$$ with respect to the Planck 2018 $$\varLambda $$CDM parameters is below $$2\sigma $$ in all the marginalized confidence regions