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Two-component millicharged dark matter and the EDGES 21 cm signal
- Source :
- Chinese Physics
- Publication Year :
- 2022
- Publisher :
- IOP, 2022.
-
Abstract
- 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.<br />Comment: 13 pages, 2 figures
- Subjects :
- Physics
Nuclear and High Energy Physics
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Age of the universe
Component (thermodynamics)
Cosmic microwave background
Dark matter
FOS: Physical sciences
Astronomy and Astrophysics
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Minimal model
High Energy Physics - Phenomenology
High Energy Physics - Phenomenology (hep-ph)
Thermal
Instrumentation
Realization (systems)
Astrophysics - Cosmology and Nongalactic Astrophysics
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Chinese Physics
- Accession number :
- edsair.doi.dedup.....2bee4b6de553d6a29e33df6b2a0eecd2