Orateur
Description
The Halo Mass Function (HMF) is a parametric function that allows to describe the distribution of halos masses given a cosmology and the redshift. It is thus widely used in cluster analyses to extract cosmological parameters like sigma_8 and Omega_M from the observation of clusters. Many different HMF exist in the literature with different parameterizations as a function of redshift and cosmological parameters. In the DESC cluster pipeline, no choice has been yet done on which function to use. I propose in this talk to make a quick review of what the HMF is, what are the different ones that exist in literature, and then compare them. The comparison is based on their capability to extract the cosmology of the LSST simulation (cosmoDC2), ie making a closure test. If results are ready on time, I will also show how this closure evolves when instead of just using clusters detected with FoF or SOD algorithms in cosmoDC2, we use the full DESC cluster pipeline.
