Chiral models of composite axions and accidental Peccei-Quinn symmetry
Abstract We introduce a class of composite axion models that provide a natural solution to the strong CP problem, and possibly account for the observed dark matter abundance. The QCD axion arises as a composite Nambu-Goldstone boson (NGB) from the dynamics of a chiral gauge theory with a strongly-in...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2022-04-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP04(2022)180 |
| _version_ | 1797865819558903808 |
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| author | Roberto Contino Alessandro Podo Filippo Revello |
| author_facet | Roberto Contino Alessandro Podo Filippo Revello |
| author_sort | Roberto Contino |
| collection | DOAJ |
| description | Abstract We introduce a class of composite axion models that provide a natural solution to the strong CP problem, and possibly account for the observed dark matter abundance. The QCD axion arises as a composite Nambu-Goldstone boson (NGB) from the dynamics of a chiral gauge theory with a strongly-interacting and confining SU(N) factor and a weakly-interacting U(1), with no fundamental scalar fields. The Peccei-Quinn (PQ) symmetry is accidental and all the mass scales are generated dynamically. We analyze specific models where the PQ symmetry is broken only by operators of dimension 12 or higher. We also classify several other models where the PQ symmetry can be potentially protected up to the dimension 15 or 18 level. Our framework can be easily extended to a scenario where the Standard Model (SM) is unified into a simple gauge group, and we discuss the case of non-supersymmetric SU(5) unification. The GUT models predict the existence of additional pseudo NGBs, parametrically lighter than the GUT and PQ scales, which could have an impact on the cosmological evolution and leave observable signatures. We also clarify the selection rules under which higher-dimensional PQ-violating operators can generate a potential for the axion in the IR, and provide a discussion of the discrete symmetries in composite axion models associated to the number of domain walls. These results can be of general interest for composite axion models based on a QCD-like confining gauge group. |
| first_indexed | 2024-04-09T23:13:54Z |
| format | Article |
| id | doaj.art-3346234923594aedba235cdb7976bc73 |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-04-09T23:13:54Z |
| publishDate | 2022-04-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-3346234923594aedba235cdb7976bc732023-03-22T10:09:45ZengSpringerOpenJournal of High Energy Physics1029-84792022-04-012022414310.1007/JHEP04(2022)180Chiral models of composite axions and accidental Peccei-Quinn symmetryRoberto Contino0Alessandro Podo1Filippo Revello2Università di Roma La SapienzaDepartment of Physics, Center for Theoretical Physics, Columbia UniversityRudolf Peierls Centre for Theoretical Physics, Clarendon Laboratory, University of OxfordAbstract We introduce a class of composite axion models that provide a natural solution to the strong CP problem, and possibly account for the observed dark matter abundance. The QCD axion arises as a composite Nambu-Goldstone boson (NGB) from the dynamics of a chiral gauge theory with a strongly-interacting and confining SU(N) factor and a weakly-interacting U(1), with no fundamental scalar fields. The Peccei-Quinn (PQ) symmetry is accidental and all the mass scales are generated dynamically. We analyze specific models where the PQ symmetry is broken only by operators of dimension 12 or higher. We also classify several other models where the PQ symmetry can be potentially protected up to the dimension 15 or 18 level. Our framework can be easily extended to a scenario where the Standard Model (SM) is unified into a simple gauge group, and we discuss the case of non-supersymmetric SU(5) unification. The GUT models predict the existence of additional pseudo NGBs, parametrically lighter than the GUT and PQ scales, which could have an impact on the cosmological evolution and leave observable signatures. We also clarify the selection rules under which higher-dimensional PQ-violating operators can generate a potential for the axion in the IR, and provide a discussion of the discrete symmetries in composite axion models associated to the number of domain walls. These results can be of general interest for composite axion models based on a QCD-like confining gauge group.https://doi.org/10.1007/JHEP04(2022)180Axions and ALPsCompositenessNew Gauge Interactions |
| spellingShingle | Roberto Contino Alessandro Podo Filippo Revello Chiral models of composite axions and accidental Peccei-Quinn symmetry Journal of High Energy Physics Axions and ALPs Compositeness New Gauge Interactions |
| title | Chiral models of composite axions and accidental Peccei-Quinn symmetry |
| title_full | Chiral models of composite axions and accidental Peccei-Quinn symmetry |
| title_fullStr | Chiral models of composite axions and accidental Peccei-Quinn symmetry |
| title_full_unstemmed | Chiral models of composite axions and accidental Peccei-Quinn symmetry |
| title_short | Chiral models of composite axions and accidental Peccei-Quinn symmetry |
| title_sort | chiral models of composite axions and accidental peccei quinn symmetry |
| topic | Axions and ALPs Compositeness New Gauge Interactions |
| url | https://doi.org/10.1007/JHEP04(2022)180 |
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