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arXiv · 2511.07511

Seasons of Dark Matter Freeze-In Shaped by the Weather of the Early Universe

Francesco D'Eramo·Alessandro Lenoci·Tommaso Sassi
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Abstract

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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Francesco D'Eramo, Alessandro Lenoci, Tommaso Sassi. 2025-11-10. Seasons of Dark Matter Freeze-In Shaped by the Weather of the Early Universe. https://doi.org/10.1103/v5gn-5n8j

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