The monodromic axion-photon coupling
Abstract We consider the general form of the axion coupling to photons in the axion-Maxwell theory. On general grounds this coupling takes the form of a monodromic function of the axion, which we call g(a), multiplying the Chern-Pontryagin density F F ~ $$ F\overset{\sim }{F} $$ of the photon. We sh...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2024-01-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP01(2024)169 |
| _version_ | 1797341341673324544 |
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| author | Prateek Agrawal Arthur Platschorre |
| author_facet | Prateek Agrawal Arthur Platschorre |
| author_sort | Prateek Agrawal |
| collection | DOAJ |
| description | Abstract We consider the general form of the axion coupling to photons in the axion-Maxwell theory. On general grounds this coupling takes the form of a monodromic function of the axion, which we call g(a), multiplying the Chern-Pontryagin density F F ~ $$ F\overset{\sim }{F} $$ of the photon. We show that the non-linearity of g(a) is a spurion for the shift symmetry of the axion. In this context, when g(a) ≠ ℤa, the linearized coupling of the axion g′(a) is not quantized and there is a correlated mass term for the axion. Singularities in g(a) due to the fast rearrangement of degrees of freedom are shown to have corresponding cusps and singularities in the axion potential. We derive the general form of g(a) for the QCD axion, axions with perturbatively broken shift symmetries and axions descending from extra dimensions. In all cases, we show that there is a uniform general form of the monodromic function g(a) and it is connected to the axion potential. |
| first_indexed | 2024-03-08T10:16:36Z |
| format | Article |
| id | doaj.art-4643645a90c64f0abee59938752614be |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-03-08T10:16:36Z |
| publishDate | 2024-01-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-4643645a90c64f0abee59938752614be2024-01-28T12:25:24ZengSpringerOpenJournal of High Energy Physics1029-84792024-01-012024112610.1007/JHEP01(2024)169The monodromic axion-photon couplingPrateek Agrawal0Arthur Platschorre1Rudolf Peierls Centre for Theoretical Physics, University of OxfordRudolf Peierls Centre for Theoretical Physics, University of OxfordAbstract We consider the general form of the axion coupling to photons in the axion-Maxwell theory. On general grounds this coupling takes the form of a monodromic function of the axion, which we call g(a), multiplying the Chern-Pontryagin density F F ~ $$ F\overset{\sim }{F} $$ of the photon. We show that the non-linearity of g(a) is a spurion for the shift symmetry of the axion. In this context, when g(a) ≠ ℤa, the linearized coupling of the axion g′(a) is not quantized and there is a correlated mass term for the axion. Singularities in g(a) due to the fast rearrangement of degrees of freedom are shown to have corresponding cusps and singularities in the axion potential. We derive the general form of g(a) for the QCD axion, axions with perturbatively broken shift symmetries and axions descending from extra dimensions. In all cases, we show that there is a uniform general form of the monodromic function g(a) and it is connected to the axion potential.https://doi.org/10.1007/JHEP01(2024)169Axions and ALPsEffective Field TheoriesNew Light Particles |
| spellingShingle | Prateek Agrawal Arthur Platschorre The monodromic axion-photon coupling Journal of High Energy Physics Axions and ALPs Effective Field Theories New Light Particles |
| title | The monodromic axion-photon coupling |
| title_full | The monodromic axion-photon coupling |
| title_fullStr | The monodromic axion-photon coupling |
| title_full_unstemmed | The monodromic axion-photon coupling |
| title_short | The monodromic axion-photon coupling |
| title_sort | monodromic axion photon coupling |
| topic | Axions and ALPs Effective Field Theories New Light Particles |
| url | https://doi.org/10.1007/JHEP01(2024)169 |
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