Subir Sarkar - A challenge to the standard cosmological model

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• Subir Sarkar (Oxford)
• Friday 04 November 2022, 15:30-16:30
• Potter Room (B1.19).

If you have a question about this talk, please contact Maeve Madigan.

The seminar takes place in person in the Potter Room at DAMPT and a broadcast is available via zoom: https://us02web.zoom.us/j/85896693592?pwd=cDBJMVJJNlkwcG9FWFBJNTJmTTJyQT09

Abstract: In the ΛCDM cosmological model the Universe is assumed to be isotropic and homogeneous when averaged on large scales. That the CMB has a dipole anisotropy is interpreted as due to our peculiar motion because of local inhomogeneity. As John Baldwin and George Ellis noted in 1983, 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, i.e. the distribution of distant matter is not isotropic in the ‘CMB frame’. This calls into question the standard practice of boosting to this frame to analyse cosmological data, in particular to infer an isotropic acceleration of the Hubble expansion rate from Type Ia supernovae, which is interpreted as due to Λ.

This talk is part of the HEP phenomenology joint Cavendish-DAMTP seminar series.

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