Université de GenèveDépartement de Physique ThéoriqueCAP Genève

Testing the Cosmological Principle in the radio frequencies

Date: 
8. November 2019 - 11:30
Speaker: 
Carlos Bengaly (University of Geneva)

The Cosmological Principle, i.e., the assumption of large-scale isotropy and homogeneity of the Universe, comprises one of the fundamental hypothesis of the standard model of Cosmology. It is thus crucial to test whether it holds true in light of observational data. A possible way to do it is to verify if the dipole seen in the CMB, ascribed to our relative motion through the sky, can also be detected in the large-scale structure through galaxy number counts. Radio continuum surveys provide a great opportunity for that as they can reach high redshifts (0<z<5), and provide a large number of sources. In this talk, I will show the results obtained with currently available catalogues, namely NVSS and TGSS, and forecasts for the SKA. We find that SKA will provide us a precision test of cosmological isotropy, enormously improving the constraints from current data. I will also briefly results obtained with other cosmological data, besides attempts to address the H0 tension.

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Département de Physique Théorique
Université de Genève
24, quai Ernest Ansermet
1211 Genève 4
Switzerland
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