Updated Big Bang Nucleosynthesis Bounds on Long-lived Particles from Dark Sectors
arXiv:2311.07688 · doi:10.1016/j.physletb.2024.138845
Abstract
As electromagnetic showers may alter the abundance of Helium, Lithium, and Deuterium, we can place severe constraints on the lifetime and amount of electromagnetic energy injected by long-lived particles. Considering up-to-date measurements of the light element abundances that point to , , and the baryon-to-photon ratio obtained from the Cosmic Microwave Background data, , we derive upper limits on the fraction of electromagnetic energy produced by long-lived particles. Our findings apply to decaying dark matter models, long-lived gravitinos, and other non-thermal processes that occurred in the early universe between seconds.
6 pages, 3 figures
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