Dark matter production during the thermalization era

Keisuke Harigaya, Kyohei Mukaida, Masaki Yamada

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

We revisit the non-thermal dark matter (DM) production during the thermalization and reheating era after inflation. The decay of inflaton produces high-energy particles that are thermalized to complete the reheating of the Universe. Before the thermalization is completed, DM can be produced from a collision between the high-energy particles and/or the ambient plasma. We calculate the DM abundance produced from these processes for the case where the cross section of the DM production is proportional to the n-th power of the center of mass energy. We find that the collision between the high-energy particles is almost always dominant for n ≳ 4 while it is subdominant for n≲2. The production from the ambient plasma is dominant when n≲3 and the reheating temperature is of the order of or larger than the DM mass. The production from a collision between the high-energy particle and the ambient plasma is important for n ≲ 2 and the reheating temperature is much lower than the DM mass.

Original languageEnglish
Article number59
JournalJournal of High Energy Physics
Volume2019
Issue number7
DOIs
Publication statusPublished - 2019 Jul 1
Externally publishedYes

Keywords

  • Cosmology of Theories beyond the SM
  • Quark-Gluon Plasma
  • Thermal Field Theory

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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