The discussion explores a model of galaxies as stationary, axially symmetric pressure-free fluids in general relativity, proposing that flattened disks of visible matter can explain galaxy rotation without invoking dark matter. The authors demonstrate that the rotation curves of several galaxies, including the Milky Way, align with mass density distributions from visible matter. This model suggests that a massive halo of dark matter is unnecessary, with a determined luminous mass density threshold of 10^{-21.75} kg.m$^{-3}. The findings challenge conventional dark matter theories and invite further examination of galaxy dynamics. The implications of this research could significantly alter our understanding of cosmic structure.
