Production of purely gravitational dark matter

Yohei Ema, Kazunori Nakayama, Yong Tang

Research output: Contribution to journalArticlepeer-review

103 Citations (Scopus)


In the purely gravitational dark matter scenario, the dark matter particle does not have any interaction except for gravitational one. We study the gravitational particle production of dark matter particle in such a minimal setup and show that correct amount of dark matter can be produced depending on the inflation model and the dark matter mass. In particular, we carefully evaluate the particle production rate from the transition epoch to the inflaton oscillation epoch in a realistic inflation model and point out that the gravitational particle production is efficient even if dark matter mass is much larger than the Hubble scale during inflation as long as it is smaller than the inflaton mass.

Original languageEnglish
Article number135
JournalJournal of High Energy Physics
Issue number9
Publication statusPublished - 2018 Sept 1


  • Classical Theories of Gravity
  • Cosmology of Theories beyond the SM


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