Cosmology With Low-Redshift Observations: No Signal For New Physics

Abstract

We analyse various low-redshift cosmological data from Type-Ia Supernova, Baryon Acoustic Oscillations, Time-Delay measurements using Strong-Lensing, $H(z)$ measurements using Cosmic Chronometers and growth measurements from large scale structure observations for $\Lambda$CDM and some different dark energy models. By calculating the Bayesian Evidence for different dark energy models, we find out that the $\Lambda$CDM still gives the best fit to the data with $H_0=70.3_{-1.35}^{+1.36}$ Km/s/Mpc (at $1\sigma$). This value is in $2\sigma$ or less tension with various low and high redshift measurements for $H_0$ including SH0ES, Planck-2018 and the recent results from H0LiCOW-XIII. The derived constraint on $S_8={\sigma }_8\sqrt{{\Omega }_{m0}/0.3}$ from our analysis is $S_8=0.76_{-0.03}^{+0.03}$, fully consistent with direct measurement of $S_8$ by KiDS+VIKING-450+DES1 survey. We hence conclude that the $\Lambda$CDM model with parameter constraints obtained in this work is consistent with different early and late Universe observations within $2\sigma$. We therefore, do not find any compelling reason to go beyond concordance $\Lambda$CDM model.

arXiv comment8 pages, 6 figures, Latex style, one updated figure, new references added, no change in the conclusion

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