2021/09/27 by Marcos A. G. Garcia, Marcos A. G. García, Kunio Kaneta +3 · 49 citations
Physics and Astronomy · #Astrophysics #Cosmology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark energy #Dark matter #Energy density #Galaxies: Formation, Evolution, Phenomena #Inflation (cosmology) #Inflaton #Particle physics #Physics #Quantum electrodynamics #Theoretical physics #Thermal #Thermodynamics #astro-ph.CO #hep-ph
paper · pdf · doi:10.1088/1475-7516/2022/03/016
published in Journal of Cosmology and Astroparticle Physics 2022(03), 016 (Institute of Physics) · 39 pages, 13 figures
arxiv created 2021/09/27 · openalex publication_date 2022/03/01 · arxiv updated 2022/03/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
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.