Speaker
Mohamed Rameez
(Tata Institute of Fundamental Research)
Description
In the standard cosmological model the universe is assumed to be statistically isotropic & homogeneous when averaged on large scales. The dipole anisotropy of the CMB is ascribed to our peculiar motion due to local inhomogeneity. There should then be a corresponding dipole in the sky map of high redshift sources. Using catalogues of radio galaxies and quasars we find that this expectation is rejected at >5σ. This undermines the standard practice of boosting to the ‘CMB frame’ to analyse cosmological data, in particular for inferring an isotropic acceleration of the Hubble expansion rate which is interpreted as due to Λ.
| Track type | Cosmology |
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Author
Mohamed Rameez
(Tata Institute of Fundamental Research)
