Spectra of fermions produced by a time-dependent axion in the radiation- and matter-dominated Universe
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arXiv
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| Hauptverfasser: | , |
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| Format: | Preprint |
| Veröffentlicht: |
2024
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| _version_ | 1866910560487997440 |
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| author | Kulkarni, Aditya Sorbo, Lorenzo |
| author_facet | Kulkarni, Aditya Sorbo, Lorenzo |
| contents | Axion-like degrees of freedom generally interact with fermions through a shift symmetric coupling. As a consequence, a time-dependent axion will lead to the generation of fermions by amplifying their vacuum fluctuations. We provide the formulae that allow one to determine the spectra of produced fermions in a generic Friedmann-Lemaitre-Robertson-Walker Universe with flat spatial slices. Then we derive simple approximate formulae for the spectra of the produced fermions, as a function of the model parameters, in the specific cases of a radiation- and a matter-dominated Universe, in the regime in which the backreaction of the produced fermions on the axionic background can be neglected. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_04550 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Spectra of fermions produced by a time-dependent axion in the radiation- and matter-dominated Universe Kulkarni, Aditya Sorbo, Lorenzo Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology High Energy Physics - Theory Axion-like degrees of freedom generally interact with fermions through a shift symmetric coupling. As a consequence, a time-dependent axion will lead to the generation of fermions by amplifying their vacuum fluctuations. We provide the formulae that allow one to determine the spectra of produced fermions in a generic Friedmann-Lemaitre-Robertson-Walker Universe with flat spatial slices. Then we derive simple approximate formulae for the spectra of the produced fermions, as a function of the model parameters, in the specific cases of a radiation- and a matter-dominated Universe, in the regime in which the backreaction of the produced fermions on the axionic background can be neglected. |
| title | Spectra of fermions produced by a time-dependent axion in the radiation- and matter-dominated Universe |
| topic | Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2408.04550 |