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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 | |
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| 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 | |
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| Academic field: | Physics |
| Specialties: |
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| Approach: | Theoretical |
Abstract
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)