Speaker
Description
The large-scale distribution of matter is influenced both by cosmology and by astrophysical processes, such as feedback from active galactic nuclei (AGN), which themselves are not independent of cosmology. This coupling gives rise to non-factorizable corrections to matter power spectrum, which will affect the cosmological interpretation of upcoming weak lensing surveys, such as Euclid and LSST. We will present a model for the non-factorizable corrections, based on a new suite of cosmological hydrodynamical simulations called FLAMINGO. The model explains the dependence of AGN feedback on cosmology in terms of a single parameter that controls the balance between the accumulation of gas by central supermassive black holes and the gravitational binding energy of halos that counteracts large-scale outflows driven by AGN. We find that baryonic feedback is stronger when combined with a mechanism to suppress structure formation, which may help address the present tension between cosmic microwave background and large-scale structure measurements of S_8.
