摘要:
   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 ΛCDM scenario. This discrepancy underscores our limited understanding of the dynamics of halo/galaxy structural evolution driven by e.g., feedback outflows, mergers, and tidal stripping. Here I will present a new unified and precise analytical model to understand the above processes. Using this model, I will show how to create DM-deficient high-z massive galaxies via dynamical heating by infalling satellites followed by DM expansion in response to AGN-driven outflows. The same framework can also generate DM-deficient dwarf galaxies through supernova feedback and tidal stripping. If time allows, I will briefly introduce another puzzle recently raised by JWST, an excess of luminous galaxies in the early Universe, and our proposed solution with feedback-free starbursts (FFB).