Dark matter production via a non-minimal coupling to gravity

Oleg Lebedev, Timofey Solomko, Jong Hyun Yoon

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

We study postinflationary scalar dark matter production via its non-minimal coupling to gravity. During the inflaton oscillation epoch, dark matter is produced resonantly for a sufficiently large non-minimal coupling ξ ≳ 5. We find that backreaction on the curvature and rescattering effects typically become important for the values of ξ above 30, which invalidate simple estimates of the production efficiency. At large couplings, the dark matter yield becomes almost independent of ξ, signifying approximate quasi-equilibrium in the inflaton-dark matter system. Although the analysis gets complicated by the presence of apparent negative energy in the Jordan frame, this behaviour can be regularized by introducing mild dark matter self-interaction. Using lattice simulations, we delineate parameter space leading to the correct dark matter relic abundance.

Original languageEnglish
Article number035
JournalJournal of Cosmology and Astroparticle Physics
Volume2023
Issue number2
DOIs
StatePublished - 1 Feb 2023
Externally publishedYes

Keywords

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

ASJC Scopus subject areas

  • Astronomy and Astrophysics

Fingerprint

Dive into the research topics of 'Dark matter production via a non-minimal coupling to gravity'. Together they form a unique fingerprint.

Cite this