Dark matter freeze-in before an early matter-dominated epoch can dominate the relic abundance, and a broad early-equilibrium plateau makes the abundance nearly independent of the annihilation cross section.
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Freeze-in Production of Dark Matter Prior to Early Matter Domination
Dark matter freeze-in before an early matter-dominated epoch can dominate the relic abundance, and a broad early-equilibrium plateau makes the abundance nearly independent of the annihilation cross section.