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Seasons of Dark Matter Freeze-In Shaped by the Weather of the Early Universe
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Quantifying the imprints of freeze-in dark matter (DM) on cosmological structures requires knowledge of its phase-space distribution. We investigate how variations in the cosmological history before nucleosynthesis, the "weather" of that epoch, give rise to distinct "seasons" in the DM momentum distribution that govern its warmness. Studying decay-driven production across diverse cosmological histories, we map how these conditions shape DM phase-space properties. Our study quantifies how the early universe composition plays a key role in determining the mass bound on freeze-in DM.
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Forward citations
Cited by 2 Pith papers
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Exploring non-equilibrium effects in sequential freeze-in
In a two-scalar dark sector, non-equilibrium phase-space evolution during sequential freeze-in alters the dark matter relic abundance by up to an order of magnitude relative to the standard number-density treatment.
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Warm dark matter from freeze-in at stronger coupling
Warm Higgs portal dark matter from stronger-coupling freeze-in is viable above 50-100 keV with a non-thermal momentum distribution not captured by the standard alpha-beta-gamma parametrization.
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