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Two-component millicharged dark matter and the EDGES 21 cm signal *

2021; IOP Publishing; Volume: 46; Issue: 4 Linguagem: Inglês

10.1088/1674-1137/ac3d2b

2058-6132

Qiaodan Li, Zuowei Liu,

Cosmology and Gravitation Theories

We propose a two-component dark matter explanation to the EDGES 21 cm anomalous signal. The heavier dark matter component is long-lived whose decay is primarily responsible for the relic abundance of the lighter dark matter which is millicharged. To evade the constraints from CMB, underground dark matter direct detection, and XQC experiments, the lifetime of the heavier dark matter has to be larger than $0.1\, \tau_U$, where $\tau_U$ is the age of the universe. Our model provides a viable realization of the millicharged dark matter model to explain the EDGES 21 cm, since the minimal model in which the relic density is generated via thermal freeze-out is ruled out by various constraints.