Thermal production of astrophobic axions
Abstract Hot axions are produced in the early Universe via their interactions with Standard Model particles, contributing to dark radiation commonly parameterized as ∆N eff. In standard QCD axion benchmark models, this contribution to ∆N eff is negligible after taking into account astrophysical limi...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2024-09-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP09(2024)136 |
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| author | Marcin Badziak Keisuke Harigaya Michał Łukawski Robert Ziegler |
| author_facet | Marcin Badziak Keisuke Harigaya Michał Łukawski Robert Ziegler |
| author_sort | Marcin Badziak |
| collection | DOAJ |
| description | Abstract Hot axions are produced in the early Universe via their interactions with Standard Model particles, contributing to dark radiation commonly parameterized as ∆N eff. In standard QCD axion benchmark models, this contribution to ∆N eff is negligible after taking into account astrophysical limits such as the SN1987A bound. We therefore compute the axion contribution to ∆N eff in so-called astrophobic axion models characterized by strongly suppressed axion couplings to nucleons and electrons, in which astrophysical constraints are relaxed and ∆N eff may be sizable. We also construct new astrophobic models in which axion couplings to photons and/or muons are suppressed as well, allowing for axion masses as large as few eV. Most astrophobic models are within the reach of CMB-S4, while some allow for ∆N eff as large as the current upper bound from Planck and thus will be probed by the Simons Observatory. The majority of astrophobic axion models predicting large ∆N eff is also within the reach of IAXO or even BabyIAXO. |
| format | Article |
| id | doaj-art-44fc0010db0f4baa8acec6acf42b0a7f |
| institution | Kabale University |
| issn | 1029-8479 |
| language | English |
| publishDate | 2024-09-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-44fc0010db0f4baa8acec6acf42b0a7f2024-12-08T12:16:40ZengSpringerOpenJournal of High Energy Physics1029-84792024-09-012024915210.1007/JHEP09(2024)136Thermal production of astrophobic axionsMarcin Badziak0Keisuke Harigaya1Michał Łukawski2Robert Ziegler3Institute of Theoretical Physics, Faculty of Physics, University of WarsawDepartment of Physics, University of ChicagoInstitute of Theoretical Physics, Faculty of Physics, University of WarsawInstitut für Theoretische Teilchenphysik, Karlsruhe Institute of TechnologyAbstract Hot axions are produced in the early Universe via their interactions with Standard Model particles, contributing to dark radiation commonly parameterized as ∆N eff. In standard QCD axion benchmark models, this contribution to ∆N eff is negligible after taking into account astrophysical limits such as the SN1987A bound. We therefore compute the axion contribution to ∆N eff in so-called astrophobic axion models characterized by strongly suppressed axion couplings to nucleons and electrons, in which astrophysical constraints are relaxed and ∆N eff may be sizable. We also construct new astrophobic models in which axion couplings to photons and/or muons are suppressed as well, allowing for axion masses as large as few eV. Most astrophobic models are within the reach of CMB-S4, while some allow for ∆N eff as large as the current upper bound from Planck and thus will be probed by the Simons Observatory. The majority of astrophobic axion models predicting large ∆N eff is also within the reach of IAXO or even BabyIAXO.https://doi.org/10.1007/JHEP09(2024)136Axions and ALPsCosmology of Theories BSM |
| spellingShingle | Marcin Badziak Keisuke Harigaya Michał Łukawski Robert Ziegler Thermal production of astrophobic axions Journal of High Energy Physics Axions and ALPs Cosmology of Theories BSM |
| title | Thermal production of astrophobic axions |
| title_full | Thermal production of astrophobic axions |
| title_fullStr | Thermal production of astrophobic axions |
| title_full_unstemmed | Thermal production of astrophobic axions |
| title_short | Thermal production of astrophobic axions |
| title_sort | thermal production of astrophobic axions |
| topic | Axions and ALPs Cosmology of Theories BSM |
| url | https://doi.org/10.1007/JHEP09(2024)136 |
| work_keys_str_mv | AT marcinbadziak thermalproductionofastrophobicaxions AT keisukeharigaya thermalproductionofastrophobicaxions AT michałłukawski thermalproductionofastrophobicaxions AT robertziegler thermalproductionofastrophobicaxions |