Dark matter halo-galaxy connection in simulations
In the current concordance CDM paradigm, galaxies form and evolve in dark matter haloes, so the halo-galaxy connection is crucial for understanding the underlying physical processes and constraining cosmological models. However, due to the dissipationless nature of dark matter, it is extremely hard to directly observe it. Nevertheless, cosmological numerical simulations enable us to study the formation and evolution of dark matter under pure gravity. Meanwhile, the incorporation with baryonic physics can also let us study the impact of dark matter halos on galaxy populations. In this talk, I will present the occupation distribution of galaxies in dark matter halos and the relation between their masses, which are the most fundamental properties for galaxies and halos. Then, I will take a step further to discuss the secondary halo - galaxy connection, which is still under debate.