Revisiting signatures of thermal axions in nonstandard cosmologies
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arXiv
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2023
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| _version_ | 1866914838652911616 |
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| author | Arias, Paola Bernal, Nicolás Osiński, Jacek K. Roszkowski, Leszek Venegas, Moira |
| author_facet | Arias, Paola Bernal, Nicolás Osiński, Jacek K. Roszkowski, Leszek Venegas, Moira |
| contents | We revisit the formation of a thermal population of hadronic axions in nonstandard cosmologies, in light of the recent developments in obtaining continuous and smooth interaction rates for both the gluon and photon couplings. For certain cosmological histories, such as low-temperature reheating (LTR) and kination-like scenarios, the thermalization of the axion can be severely delayed to higher masses. In the case that thermal equilibrium is achieved, we improve the constraints on LTR for axion masses around the eV scale with respect to previous works and we constrain for the first time early matter-dominated (EMD) cosmologies. We also point out the possibility of having the co-existence of cold and warm dark matter populations of axions in kination-like scenarios in the eV mass range. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_01352 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Revisiting signatures of thermal axions in nonstandard cosmologies Arias, Paola Bernal, Nicolás Osiński, Jacek K. Roszkowski, Leszek Venegas, Moira High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics We revisit the formation of a thermal population of hadronic axions in nonstandard cosmologies, in light of the recent developments in obtaining continuous and smooth interaction rates for both the gluon and photon couplings. For certain cosmological histories, such as low-temperature reheating (LTR) and kination-like scenarios, the thermalization of the axion can be severely delayed to higher masses. In the case that thermal equilibrium is achieved, we improve the constraints on LTR for axion masses around the eV scale with respect to previous works and we constrain for the first time early matter-dominated (EMD) cosmologies. We also point out the possibility of having the co-existence of cold and warm dark matter populations of axions in kination-like scenarios in the eV mass range. |
| title | Revisiting signatures of thermal axions in nonstandard cosmologies |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2308.01352 |