= Galactic angular-momentum catastrophe
The <galactic angular-momentum catastrophe> is the excessive loss or redistribution of baryonic <specific angular momentum> in early simulated <galaxy> formation, producing overly compact disks or large central <concentrations>. Premature cooling, gravitational torques, interactions, and resolution contributed. Improved <stellar feedback> and gas accretion histories can mitigate it; it is a historical simulation problem rather than a theorem against <cold dark matter>.
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