Chiral anomaly in SU(2) R -axion inflation and the new prediction for particle cosmology
Abstract Upon embedding the axion-inflation in the minimal left-right symmetric gauge extension of the SM with gauge group SU(2) L × SU(2) R × U(1)B−L, [1] proposed a new particle physics model for inflation. In this work, we present a more detailed analysis. As a compelling consequence, this setup...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2021-06-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP06(2021)113 |
| _version_ | 1818865304229380096 |
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| author | Azadeh Maleknejad |
| author_facet | Azadeh Maleknejad |
| author_sort | Azadeh Maleknejad |
| collection | DOAJ |
| description | Abstract Upon embedding the axion-inflation in the minimal left-right symmetric gauge extension of the SM with gauge group SU(2) L × SU(2) R × U(1)B−L, [1] proposed a new particle physics model for inflation. In this work, we present a more detailed analysis. As a compelling consequence, this setup provides a new mechanism for simultaneous baryogenesis and right-handed neutrino creation by the chiral anomaly of W R in inflation. The lightest right-handed neutrino is the dark matter candidate. This setup has two unknown fundamental scales, i.e., the scale of inflation and left-right symmetry breaking SU(2) R × U(1)B−L → U(1) Y . Sufficient matter creation demands the left-right symmetry breaking scale happens shortly after the end of inflation. Interestingly, it prefers left-right symmetry breaking scales above 1010 GeV, which is in the range suggested by the non-supersymmetric SO(10) Grand Unified Theory with an intermediate left-right symmetry scale. Although W R gauge field generates equal amounts of right-handed baryons and leptons in inflation, i.e. B − L = 0, in the Standard Model sub-sector B − LSM ≠ 0. A key aspect of this setup is that SU(2) R sphalerons are never in equilibrium, and the primordial B − LSM is conserved by the Standard Model interactions. This setup yields a deep connection between CP violation in physics of inflation and matter creation (visible and dark); hence it can naturally explain the observed coincidences among cosmological parameters, i.e., η B ≃ 0.3P ζ and ΩDM ≃ 5ΩB. The new mechanism does not rely on the largeness of the unconstrained CP-violating phases in the neutrino sector nor fine-tuned masses for the heaviest right-handed neutrinos. The SU(2) R -axion inflation comes with a cosmological smoking gun; chiral, non-Gaussian, and blue-tilted gravitational wave background, which can be probed by future CMB missions and laser interferometer detectors. |
| first_indexed | 2024-12-19T10:45:25Z |
| format | Article |
| id | doaj.art-53265be63c3a4d66a41359e17e8f2b23 |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-12-19T10:45:25Z |
| publishDate | 2021-06-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-53265be63c3a4d66a41359e17e8f2b232022-12-21T20:25:17ZengSpringerOpenJournal of High Energy Physics1029-84792021-06-012021614810.1007/JHEP06(2021)113Chiral anomaly in SU(2) R -axion inflation and the new prediction for particle cosmologyAzadeh Maleknejad0Theoretical Physics Department, CERNAbstract Upon embedding the axion-inflation in the minimal left-right symmetric gauge extension of the SM with gauge group SU(2) L × SU(2) R × U(1)B−L, [1] proposed a new particle physics model for inflation. In this work, we present a more detailed analysis. As a compelling consequence, this setup provides a new mechanism for simultaneous baryogenesis and right-handed neutrino creation by the chiral anomaly of W R in inflation. The lightest right-handed neutrino is the dark matter candidate. This setup has two unknown fundamental scales, i.e., the scale of inflation and left-right symmetry breaking SU(2) R × U(1)B−L → U(1) Y . Sufficient matter creation demands the left-right symmetry breaking scale happens shortly after the end of inflation. Interestingly, it prefers left-right symmetry breaking scales above 1010 GeV, which is in the range suggested by the non-supersymmetric SO(10) Grand Unified Theory with an intermediate left-right symmetry scale. Although W R gauge field generates equal amounts of right-handed baryons and leptons in inflation, i.e. B − L = 0, in the Standard Model sub-sector B − LSM ≠ 0. A key aspect of this setup is that SU(2) R sphalerons are never in equilibrium, and the primordial B − LSM is conserved by the Standard Model interactions. This setup yields a deep connection between CP violation in physics of inflation and matter creation (visible and dark); hence it can naturally explain the observed coincidences among cosmological parameters, i.e., η B ≃ 0.3P ζ and ΩDM ≃ 5ΩB. The new mechanism does not rely on the largeness of the unconstrained CP-violating phases in the neutrino sector nor fine-tuned masses for the heaviest right-handed neutrinos. The SU(2) R -axion inflation comes with a cosmological smoking gun; chiral, non-Gaussian, and blue-tilted gravitational wave background, which can be probed by future CMB missions and laser interferometer detectors.https://doi.org/10.1007/JHEP06(2021)113Beyond Standard ModelCosmology of Theories beyond the SMCP violationNeutrino Physics |
| spellingShingle | Azadeh Maleknejad Chiral anomaly in SU(2) R -axion inflation and the new prediction for particle cosmology Journal of High Energy Physics Beyond Standard Model Cosmology of Theories beyond the SM CP violation Neutrino Physics |
| title | Chiral anomaly in SU(2) R -axion inflation and the new prediction for particle cosmology |
| title_full | Chiral anomaly in SU(2) R -axion inflation and the new prediction for particle cosmology |
| title_fullStr | Chiral anomaly in SU(2) R -axion inflation and the new prediction for particle cosmology |
| title_full_unstemmed | Chiral anomaly in SU(2) R -axion inflation and the new prediction for particle cosmology |
| title_short | Chiral anomaly in SU(2) R -axion inflation and the new prediction for particle cosmology |
| title_sort | chiral anomaly in su 2 r axion inflation and the new prediction for particle cosmology |
| topic | Beyond Standard Model Cosmology of Theories beyond the SM CP violation Neutrino Physics |
| url | https://doi.org/10.1007/JHEP06(2021)113 |
| work_keys_str_mv | AT azadehmaleknejad chiralanomalyinsu2raxioninflationandthenewpredictionforparticlecosmology |