Cosmology of Sub-MeV Dark Matter Freeze-In.

  title={Cosmology of Sub-MeV Dark Matter Freeze-In.},
  author={Cora Dvorkin and Tongyan Lin and Katelin Schutz},
  journal={Physical review letters},
  volume={127 11},
Dark matter (DM) could be a relic of freeze-in through a light mediator, where the DM is produced by extremely feeble, IR-dominated processes in the thermal standard model plasma. In the simplest viable models with DM lighter than 1 MeV, the DM has a small effective electric charge and is born with a nonthermal phase-space distribution. This DM candidate would cause observable departures from standard cosmological evolution. In this work, we combine data from the cosmic microwave background… 

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