Is ${\omega }_0{\omega }_a$CDM a good model for the clumpy Universe?

Abstract

The DESI collaboration just obtained a set of precise BAO measurements, that combined with CMB and SNIa datasets show that the ${\omega }_0{\omega }_a$CDM model is preferred over $\Lambda$CDM, at more than $4\sigma$, to describe the dynamics of the expanding Universe. This raises the question whether this model also suitably describes the clumpy Universe. Also lately, detailed analyses of diverse cosmic tracers resulted in a new dataset of measurements of an observable from the clumpy Universe: ${\sigma }_8(z)$, spanning a high-redshift data $z\in [0.013,3.8]$. In this work we use this dataset of 15 ${\sigma }_8(z_i)$ measurements to study the viability of the ${\omega }_0{\omega }_a$CDM cosmological model to explain the clustered Universe. Our analyses compare the ${\omega }_0{\omega }_a$CDM model with the ${\sigma }_8(z)$ function reconstructed from the data points using Gaussian Process. Moreover, we perform a similar evaluation of the $\Lambda$CDM model considering Planck and~DESI best-fit parameters. In addition, we implemented robustness tests regarding Gaussian Process reconstruction to support our results.

arXiv comment8 pages, 3 figures

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• Viability of general relativity and modified gravity cosmologies using high-redshift cosmic probes
• Testing Scale-Dependent Suppression of Structure Growth in the Linear Regime