Cosmology Intertwined III: $f{\sigma }_8$ and $S_8$

Abstract

The standard $\Lambda$ Cold Dark Matter cosmological model provides a wonderful fit to current cosmological data, but a few tensions and anomalies became statistically significant with the latest data analyses. While these anomalies could be due to the presence of systematic errors in the experiments, they could also indicate the need for new physics beyond the standard model. In this Letter of Interest we focus on the tension of the Planck data with weak lensing measurements and redshift surveys, about the value of the matter energy density ${\Omega }_m$, and the amplitude or rate of the growth of structure (${\sigma }_8,f{\sigma }_8$). We list a few interesting models for solving this tension, and we discuss the importance of trying to fit with a single model a full array of data and not just one parameter at a time.

arXiv commentSnowmass2021 - Letter of Interest

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