Ultra-relativistic freeze-out during reheating produces the observed dark matter abundance across a far wider mass and coupling range than standard WIMP or freeze-in scenarios, with the light-mass region contingent on the cooling history.
Note that for k >4, the evolution of the inflaton is subject to the effects of fragmentation [13, 14] which cause the equation of state to evolve to k = 4
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Ultra-Relativistic Freeze-Out During Reheating
Ultra-relativistic freeze-out during reheating produces the observed dark matter abundance across a far wider mass and coupling range than standard WIMP or freeze-in scenarios, with the light-mass region contingent on the cooling history.