Light cold dark matter from non-thermal decay

Ki Young Choi, Jinn Ouk Gong, Junghoon Joh, Wan Il Park, Osamu Seto

Research output: Contribution to journalArticlepeer-review


We investigate the mass range and the corresponding free-streaming length scale of dark matter produced non-thermally from decay of heavy objects which can be either dominant or sub-dominant at the moment of decay. We show that the resulting dark matter could be very light well below keV scale with a free-streaming length satisfying the Lyman-α constraints. We demonstrate two explicit examples for such light cold dark matter.

Original languageEnglish
Article number138126
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
StatePublished - 10 Oct 2023

Bibliographical note

Publisher Copyright:
© 2023 The Author(s)


  • Axion
  • Dark matter
  • Non-thermal production
  • Q-ball


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