Non-perturbative production of fermionic dark matter from fast preheating

Klaric, Juraj;et.al.
(2023) Journal of Cosmology and Astroparticle Physics — Vol. 02 (2023)

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Authors
  • Klaric, JurajUCLouvain
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  • et. al.
Abstract
We investigate non-perturbative production of fermionic dark matter in the early universe. We study analytically the gravitational production mechanism accompanied by the coupling of fermions to the background inflaton field. The latter leads to the variation of effective fermion mass during preheating and makes the resulting spectrum and abundance sensitive to its parameters. Assuming fast preheating that completes in less than the inflationary Hubble time and no oscillations of the inflaton field after inflation, we find an abundant production of particles with energies ranging from the inflationary Hubble rate to the inverse duration of preheating. The produced fermions can account for all observed dark matter in a broad range of parameters. As an application of our analysis, we study non-perturbative production of fermionic dark matter in the model of Palatini Higgs inflation.
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Klaric, J., & et al. (2023). Non-perturbative production of fermionic dark matter from fast preheating. Journal of Cosmology and Astroparticle Physics, 02. https://doi.org/10.1088/1475-7516/2023/02/034 (Original work published 2023)