QCD axion dark matter in the dark dimension
Abstract The recently proposed dark dimension scenario reveals that axions can be localized on the Standard Model brane, thereby predicting the quantum chromodynamics (QCD) axion decay constant from the Weak Gravity Conjecture: f a ≲ M 5 ~ 109 – 1010 GeV, where M 5 is the five-dimensional Planck mas...
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SpringerOpen
2025-05-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP05(2025)139 |
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| author | Hai-Jun Li |
| author_facet | Hai-Jun Li |
| author_sort | Hai-Jun Li |
| collection | DOAJ |
| description | Abstract The recently proposed dark dimension scenario reveals that axions can be localized on the Standard Model brane, thereby predicting the quantum chromodynamics (QCD) axion decay constant from the Weak Gravity Conjecture: f a ≲ M 5 ~ 109 – 1010 GeV, where M 5 is the five-dimensional Planck mass. When combined with observational lower bounds, this implies that f a falls within a narrow range f a ~ 109 – 1010 GeV, corresponding to the axion mass m a ~ 10 −3 – 10 −2 eV. At this scale, the QCD axion constitutes a minor fraction of the total cold dark matter (DM) density ~ 10 −3 – 10 −2. In this work, we investigate the issue of QCD axion DM within the context of the dark dimension and demonstrate that the QCD axion in this scenario can account for the entire DM abundance through a simple two-axion mixing mechanism. Specifically, we consider the resonant conversion of an axion-like particle (ALP) into the QCD axion. We find that, in a scenario where the ALP possesses a mass of approximately m A ~ 10 −5 eV and a decay constant of f A ~ 1011 GeV, the QCD axion in the dark dimension can account for the overall DM. The ALP required within this specific range may originate from the grand unification of gauge forces in the dark dimension. |
| format | Article |
| id | doaj-art-259fab25b5564a8dafdac2cbc56f59fb |
| institution | OA Journals |
| issn | 1029-8479 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-259fab25b5564a8dafdac2cbc56f59fb2025-08-20T02:30:49ZengSpringerOpenJournal of High Energy Physics1029-84792025-05-012025512010.1007/JHEP05(2025)139QCD axion dark matter in the dark dimensionHai-Jun Li0Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of SciencesAbstract The recently proposed dark dimension scenario reveals that axions can be localized on the Standard Model brane, thereby predicting the quantum chromodynamics (QCD) axion decay constant from the Weak Gravity Conjecture: f a ≲ M 5 ~ 109 – 1010 GeV, where M 5 is the five-dimensional Planck mass. When combined with observational lower bounds, this implies that f a falls within a narrow range f a ~ 109 – 1010 GeV, corresponding to the axion mass m a ~ 10 −3 – 10 −2 eV. At this scale, the QCD axion constitutes a minor fraction of the total cold dark matter (DM) density ~ 10 −3 – 10 −2. In this work, we investigate the issue of QCD axion DM within the context of the dark dimension and demonstrate that the QCD axion in this scenario can account for the entire DM abundance through a simple two-axion mixing mechanism. Specifically, we consider the resonant conversion of an axion-like particle (ALP) into the QCD axion. We find that, in a scenario where the ALP possesses a mass of approximately m A ~ 10 −5 eV and a decay constant of f A ~ 1011 GeV, the QCD axion in the dark dimension can account for the overall DM. The ALP required within this specific range may originate from the grand unification of gauge forces in the dark dimension.https://doi.org/10.1007/JHEP05(2025)139Axions and ALPsExtra DimensionsModels for Dark MatterString and Brane Phenomenology |
| spellingShingle | Hai-Jun Li QCD axion dark matter in the dark dimension Journal of High Energy Physics Axions and ALPs Extra Dimensions Models for Dark Matter String and Brane Phenomenology |
| title | QCD axion dark matter in the dark dimension |
| title_full | QCD axion dark matter in the dark dimension |
| title_fullStr | QCD axion dark matter in the dark dimension |
| title_full_unstemmed | QCD axion dark matter in the dark dimension |
| title_short | QCD axion dark matter in the dark dimension |
| title_sort | qcd axion dark matter in the dark dimension |
| topic | Axions and ALPs Extra Dimensions Models for Dark Matter String and Brane Phenomenology |
| url | https://doi.org/10.1007/JHEP05(2025)139 |
| work_keys_str_mv | AT haijunli qcdaxiondarkmatterinthedarkdimension |