Increasing temperature toward the completion of reheating

Raymond T. Co, Eric Gonzalez, Keisuke Harigaya

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


Reheating is a process where the energy density of a dominant component of the universe other than radiation, such as a matter component, is transferred into radiation. It is usually assumed that the temperature of the universe decreases due to cosmic expansion even during the reheating process, in which case the maximal temperature of the universe is much higher than the reheat temperature. We point out that the temperature of the universe during reheating may in fact increase in well-motivated scenarios. We derive the necessary conditions for the temperature to increase during reheating and discuss concrete examples involving a scalar field. We comment on implications for particle physics and cosmology due to an increasing temperature during reheating.

Original languageEnglish (US)
Article number038
JournalJournal of Cosmology and Astroparticle Physics
Issue number11
StatePublished - Nov 2020

Bibliographical note

Publisher Copyright:
© 2020 IOP Publishing Ltd and Sissa Medialab.


  • cosmology of theories beyond the SM
  • inflation
  • particle physics - cosmology connection
  • physics of the early universe


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