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Testing consistency of standard cosmology model over time

Published on:

7 February 2024

Primary Category:

Cosmology and Nongalactic Astrophysics

Paper Authors:

Özgür Akarsu,

Eoin Ó Colgáin,

Anjan A. Sen,

M. M. Sheikh-Jabbari


Key Details

ΛCDM tensions signal its consistency should be checked before exploring alternatives

Redshift is more fundamental than scale for cosmological dynamics

Consistency checks should first probe redshift-dependence

Then probe scale-dependence to localize missing physics

H0 and S8 trends suggest ΛCDM background cosmology issues

AI generated summary

Testing consistency of standard cosmology model over time

This paper reviews the assumptions behind the standard Lambda Cold Dark Matter (ΛCDM) model of cosmology and discusses checking for inconsistencies over time by looking for redshift-dependence of key fitting parameters. It argues this is imperative before exploring more complex models, to localize where existing physics may be breaking down. Particular focus is given to recent progress on tensions in Hubble constant H0 and matter clustering parameter S8. Findings suggest their redshift-dependence implies problems with the background ΛCDM cosmology, not just its perturbations.

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