CosmoVerse@Krakow: Geraint Lewis: Is the cosmological principle in trouble?

This series is the recording of the CosmoVerse@Krakow conference that happened between 9 and 11 July 2024.

Geraint Lewis:
Is the cosmological principle in trouble?

I will present our recent results exploring the integrity of the cosmological principle, the idea that, on sufficient scales, the universe is homogeneous and isotropic. Recent tensions have arisen between the dipole of cosmological sources and its interpretation from the CMB as a kinematic departure from the local Hubble Flow, bringing the cosmological principle into doubt. With a Bayesian-based approach, I explore the cosmological dipole in optical/IR catalogues of quasars, using Bayesian evidence to assess differing hypotheses. The conclusion is, that whilst the picture is not completely clear, the results support the veracity of the cosmological principle.

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