# On the tension between growth rate and CMB data

## TL;DR

This paper investigates the discrepancy between redshift space distortion measurements of structure growth and the predictions of standard mbda CDM cosmology, finding the tension to be below 2 sigma with current data and models.

## Contribution

It provides a detailed analysis of the growth rate tension using updated datasets and cosmological models, showing the discrepancy is less significant than previously thought.

## Key findings

- Tension between measurements and mbda CDM is below 2 sigma.
- Updated dataset and analysis reduce the perceived discrepancy.
- Results are consistent with Planck 2018 mbda CDM parameters.

## 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.