Freeze-in from preheating

Marcos A.G. Garcia, Kunio Kaneta, Yann Mambrini, Keith A. Olive, Sarunas Verner

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


We consider the production of dark matter during the process of reheating after inflation. The relic density of dark matter from freeze-in depends on both the energy density and energy distribution of the inflaton scattering or decay products composing the radiation bath. We compare the perturbative and non-perturbative calculations of the energy density in radiation. We also consider the (likely) possibility that the final state scalar products are unstable. Assuming either thermal or non-thermal energy distribution functions, we compare the resulting relic density based on these different approaches. We show that the present-day cold dark matter density can be obtained through freeze-in from preheating for a large range of dark matter masses.

Original languageEnglish (US)
Article number016
JournalJournal of Cosmology and Astroparticle Physics
Issue number3
StatePublished - Mar 1 2022

Bibliographical note

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© 2022 IOP Publishing Ltd and Sissa Medialab


  • dark matter theory
  • inflation
  • physics of the early universe


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