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Clusters and proto-­‐clusters of galaxies in a cosmological context

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Proposed in 2016 by:
Marguerite PIERRE, Service d’Astrophysique du CEA
and Patrick VALAGEAS, Institut de Physique Théorique du CEA

The cosmological parameters entering the equations of General Relativity, like the mean density of the Universe and the matter versus energy content, can be primarily determined from the analysis of the cosmic microwave background radiation. This measurement (some 400000 years after the Big Bang) is very usefully complemented by independent probes at much later times, like supernovae, baryonic acoustic oscillations, weak lensing and clusters of galaxies. Moreover, the low-­‐redshift Universe corresponds to the time where the effect of dark energy is dominant. Clusters of galaxies are uniquely advantageous because they provide measures of both the geometry of the Universe and of the growth of the cosmic structures. Cosmological tests involving clusters mostly rely on the analysis of number counts and of their spatial distribution as a function of cosmic time....More on this document

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