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Axions in the Early Universe

by Francesco D'Eramo

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Submission summary

Authors (as registered SciPost users): Francesco D'Eramo
Submission information
Preprint Link: scipost_202210_00053v1  (pdf)
Date accepted: 2023-04-24
Date submitted: 2022-10-07 22:39
Submitted by: D'Eramo, Francesco
Submitted to: SciPost Physics Proceedings
Proceedings issue: 14th International Conference on Identification of Dark Matter (IDM2022)
Ontological classification
Academic field: Physics
  • Gravitation, Cosmology and Astroparticle Physics
  • High-Energy Physics - Phenomenology
Approach: Theoretical


The Peccei-Quinn solution to the strong CP problem provides a motivated framework rich in cosmological consequence. Thermal axion production is unavoidable if there is a thermal bath at early times. Scattering and decay processes of bath particles can dump relativistic axions in the primordial plasma, and they can leave observable signatures in cosmological observables probing both the early and the late universe if produced with a significant abundance. We present recent and significant improvements for the calculation of the axion production rate for different scenarios and apply these results to predict the abundance of produced axions. Finally, we provide updated cosmological bounds on the QCD axion mass.

Published as SciPost Phys. Proc. 12, 005 (2023)

Reports on this Submission

Anonymous Report 1 on 2022-11-8 (Invited Report)


The axion production and abundance in the early universe is a relevant topic in particle physics, cosmology and dark matter. I recommended the proceeding for publication.

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