Speaker
Jan Ostrowski
(Centre de Recherche Astrophysique de Lyon)
Description
The existence of the most massive virialized objects can be used as a tool to study properties of the Universe, such as the nature of gravity and dark sector, as well as, the Gaussianity of primordial density fluctuations. In my talk I will show the predictions for the most massive objects in the Universe using the silent universe model (Einstein field equations with no rotation and energy transfer) and the scalar averaging formalism with the Zel'dovich approximation serving as a closure condition. I will present the cosmological mass function of galaxy clusters for both cases and put them in the context of current and future astronomical sky surveys.
