Catalogues of Cosmologically Self-Consistent Hadronic QCD Axion Models
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| Format: | Preprint |
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2024
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| _version_ | 1866912345986433024 |
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| author | Di Luzio, Luca Hoof, Sebastian Marinissen, Coenraad Plakkot, Vaisakh |
| author_facet | Di Luzio, Luca Hoof, Sebastian Marinissen, Coenraad Plakkot, Vaisakh |
| contents | We extend the catalogue of "phenomenologically preferred" hadronic axion models to include heavy fermion representations associated with higher-dimensional decay operators. The latter have recently been shown to self-consistently trigger a period of early matter domination, making the underlying axion models cosmologically viable. After identifying all possible representations up to decay operator dimension $d \leq 9$, we update the hadronic axion band for the axion-photon coupling. The central regions of the axion band are similar to those found previously and approximately independent of the axion decay constant $f_a$, suggesting that they are robust predictions and targets for future axion searches. Moreover, we find that $d = 6$ and $d = 7$ operators can lead to two new viable "model islands" around $f_a \sim 10^{12}$ GeV and $f_a \sim 10^{14}$ GeV, i.e., beyond the standard post-inflationary mass region. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2412_17896 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Catalogues of Cosmologically Self-Consistent Hadronic QCD Axion Models Di Luzio, Luca Hoof, Sebastian Marinissen, Coenraad Plakkot, Vaisakh High Energy Physics - Phenomenology We extend the catalogue of "phenomenologically preferred" hadronic axion models to include heavy fermion representations associated with higher-dimensional decay operators. The latter have recently been shown to self-consistently trigger a period of early matter domination, making the underlying axion models cosmologically viable. After identifying all possible representations up to decay operator dimension $d \leq 9$, we update the hadronic axion band for the axion-photon coupling. The central regions of the axion band are similar to those found previously and approximately independent of the axion decay constant $f_a$, suggesting that they are robust predictions and targets for future axion searches. Moreover, we find that $d = 6$ and $d = 7$ operators can lead to two new viable "model islands" around $f_a \sim 10^{12}$ GeV and $f_a \sim 10^{14}$ GeV, i.e., beyond the standard post-inflationary mass region. |
| title | Catalogues of Cosmologically Self-Consistent Hadronic QCD Axion Models |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2412.17896 |