Imprints of fermionic and bosonic mixed dark matter on the 21-cm signal at cosmic dawn

  title={Imprints of fermionic and bosonic mixed dark matter on the 21-cm signal at cosmic dawn},
  author={Sambit K. Giri and Aurel Schneider},
  journal={Physical Review D},
The 21-cm signal from the epoch of cosmic dawn prior to reionization consists of a promising observable to gain new insights into the dark matter (DM) sector. In this paper, we investigate its potential to constrain mixed (cold + noncold) dark matter scenarios that are characterized by the noncold DM fraction ( f nCDM ) and particle mass ( m nCDM ). As noncold DM species, we investigate both a fermionic (sterile neutrino) and a bosonic (ultralight axion) particle. We show how these scenarios a… 
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