Subir Sarkar "A challenge to the standard cosmological model"

Wednesday 12 Oct 2022, 13:30 → 14:30 Europe/Stockholm

Albano 3: 6228 - Mega (22 seats) (Albano Building 3)

In the ΛCDM cosmological model the universe is assumed to be statistically isotropic and homogeneous when averaged on large scales. That the CMB has a dipole anisotropy is supposedly due to our peculiar motion because of local inhomogeneity.  There should then be a similar dipole in the sky distribution of high redshift sources. Using catalogues of radio sources and quasars we find that this standard expectation is rejected at >5σ. This undermines the standard practice of boosting to the 'CMB frame' to analyze cosmological data, in particular for inferring an isotropic acceleration of the Hubble expansion rate which is interpreted as due to Λ. [arXiv:2206.05624]

Sarkar_2022-Oct-12.mp4