Speaker
Description
Recent observations reported a puzzling dearth of dark matter (DM) in a fraction of massive high-z galaxies and dwarf galaxies, challenging current simulation predictions within the standard LCDM scenario. This discrepancy underscores our limited understanding of the driving forces behind the halo structural evolution, including feedback outflows, mergers, and tidal interaction. Here we introduce "CuspCore2", a novel analytic model providing the first unified and precise framework to trace the violent relaxation of a halo undergoing these processes. Using this model, we developed a scenario for DM-deficient cores in high-z massive galaxies via dynamical heating by infalling satellites followed by DM expansion in response to AGN-driven outflows. The same framework can generate DM-deficient dwarf galaxies through supernova feedback and tidal stripping. Given the universality of the violent relaxation process, our model promises extensive applications for general galactic dynamic problems.
