Dynamics of relaxed inflation
Abstract The cosmological relaxation of the electroweak scale has been proposed as a mechanism to address the hierarchy problem of the Standard Model. A field, the relaxion, rolls down its potential and, in doing so, scans the squared mass parameter of the Higgs, relaxing it to a parametrically smal...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2018-02-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1007/JHEP02(2018)084 |
| _version_ | 1811261256319893504 |
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| author | Walter Tangarife Kohsaku Tobioka Lorenzo Ubaldi Tomer Volansky |
| author_facet | Walter Tangarife Kohsaku Tobioka Lorenzo Ubaldi Tomer Volansky |
| author_sort | Walter Tangarife |
| collection | DOAJ |
| description | Abstract The cosmological relaxation of the electroweak scale has been proposed as a mechanism to address the hierarchy problem of the Standard Model. A field, the relaxion, rolls down its potential and, in doing so, scans the squared mass parameter of the Higgs, relaxing it to a parametrically small value. In this work, we promote the relaxion to an inflaton. We couple it to Abelian gauge bosons, thereby introducing the necessary dissipation mechanism which slows down the field in the last stages. We describe a novel reheating mechanism, which relies on the gauge-boson production leading to strong electro-magnetic fields, and proceeds via the vacuum production of electron-positron pairs through the Schwinger effect. We refer to this mechanism as Schwinger reheating. We discuss the cosmological dynamics of the model and the phenomenological constraints from CMB and other experiments. We find that a cutoff close to the Planck scale may be achieved. In its minimal form, the model does not generate sufficient curvature perturbations and additional ingredients, such as a curvaton field, are needed. |
| first_indexed | 2024-04-12T18:59:48Z |
| format | Article |
| id | doaj.art-a06b81b413594ea48928e4db8db0d406 |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-04-12T18:59:48Z |
| publishDate | 2018-02-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-a06b81b413594ea48928e4db8db0d4062022-12-22T03:20:10ZengSpringerOpenJournal of High Energy Physics1029-84792018-02-012018214010.1007/JHEP02(2018)084Dynamics of relaxed inflationWalter Tangarife0Kohsaku Tobioka1Lorenzo Ubaldi2Tomer Volansky3Raymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv UniversityRaymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv UniversityRaymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv UniversityRaymond and Beverly Sackler School of Physics and Astronomy, Tel-Aviv UniversityAbstract The cosmological relaxation of the electroweak scale has been proposed as a mechanism to address the hierarchy problem of the Standard Model. A field, the relaxion, rolls down its potential and, in doing so, scans the squared mass parameter of the Higgs, relaxing it to a parametrically small value. In this work, we promote the relaxion to an inflaton. We couple it to Abelian gauge bosons, thereby introducing the necessary dissipation mechanism which slows down the field in the last stages. We describe a novel reheating mechanism, which relies on the gauge-boson production leading to strong electro-magnetic fields, and proceeds via the vacuum production of electron-positron pairs through the Schwinger effect. We refer to this mechanism as Schwinger reheating. We discuss the cosmological dynamics of the model and the phenomenological constraints from CMB and other experiments. We find that a cutoff close to the Planck scale may be achieved. In its minimal form, the model does not generate sufficient curvature perturbations and additional ingredients, such as a curvaton field, are needed.http://link.springer.com/article/10.1007/JHEP02(2018)084Beyond Standard ModelCosmology of Theories beyond the SMHiggs PhysicsNonperturbative Effects |
| spellingShingle | Walter Tangarife Kohsaku Tobioka Lorenzo Ubaldi Tomer Volansky Dynamics of relaxed inflation Journal of High Energy Physics Beyond Standard Model Cosmology of Theories beyond the SM Higgs Physics Nonperturbative Effects |
| title | Dynamics of relaxed inflation |
| title_full | Dynamics of relaxed inflation |
| title_fullStr | Dynamics of relaxed inflation |
| title_full_unstemmed | Dynamics of relaxed inflation |
| title_short | Dynamics of relaxed inflation |
| title_sort | dynamics of relaxed inflation |
| topic | Beyond Standard Model Cosmology of Theories beyond the SM Higgs Physics Nonperturbative Effects |
| url | http://link.springer.com/article/10.1007/JHEP02(2018)084 |
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