Primordial non-Gaussianity as a probe of seesaw and leptogenesis
Abstract We present the possibility that the seesaw mechanism and nonthermal leptogenesis can be investigated via primordial non-Gaussianities in the context of a majoron curvaton model. Originating as a massless Nambu-Goldstone boson from the spontaneous breaking of the global baryon (B) minus lept...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2023-11-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP11(2023)182 |
| _version_ | 1827277384581120000 |
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| author | Chee Sheng Fong Anish Ghoshal Abhishek Naskar Moinul Hossain Rahat Shaikh Saad |
| author_facet | Chee Sheng Fong Anish Ghoshal Abhishek Naskar Moinul Hossain Rahat Shaikh Saad |
| author_sort | Chee Sheng Fong |
| collection | DOAJ |
| description | Abstract We present the possibility that the seesaw mechanism and nonthermal leptogenesis can be investigated via primordial non-Gaussianities in the context of a majoron curvaton model. Originating as a massless Nambu-Goldstone boson from the spontaneous breaking of the global baryon (B) minus lepton (L) number symmetry at a scale v B−L , majoron becomes massive when it couples to a new confining sector through anomaly. Acting as a curvaton, majoron produces the observed red-tilted curvature power spectrum without relying on any inflaton contribution, and its decay in the post-inflationary era gives rise to a nonthermal population of right-handed neutrinos that participate in leptogenesis. A distinctive feature of the mechanism is the generation of observable non-Gaussianity, in the parameter space where the red-tilted power spectrum and sufficient baryon asymmetry are produced. We find that the non-Gaussianity parameter f NL ≳ O $$ \mathcal{O} $$ (0.1) is produced for high-scale seesaw (v B−L at O $$ \mathcal{O} $$ (1014−17) GeV) and leptogenesis (M 1 ≳ O $$ \mathcal{O} $$ (106) GeV) where the latter represents the lightest right-handed neutrino mass. While the current bounds on local non-Gaussianity excludes some part of parameter space, the rest can be fully probed by future experiments like CMB-S4, LSST, and 21 cm tomography. |
| first_indexed | 2024-03-09T06:02:47Z |
| format | Article |
| id | doaj.art-e05031c0aa5145fba20801dc5962b663 |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-04-24T07:20:11Z |
| publishDate | 2023-11-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-e05031c0aa5145fba20801dc5962b6632024-04-21T11:05:49ZengSpringerOpenJournal of High Energy Physics1029-84792023-11-0120231112510.1007/JHEP11(2023)182Primordial non-Gaussianity as a probe of seesaw and leptogenesisChee Sheng Fong0Anish Ghoshal1Abhishek Naskar2Moinul Hossain Rahat3Shaikh Saad4Centro de Ciências Naturais e Humanas, Universidade Federal do ABCInstitute of Theoretical Physics, Faculty of Physics, University of WarsawIndian Institute of Technology — MumbaiSchool of Physics & Astronomy, University of SouthamptonDepartment of Physics, University of BaselAbstract We present the possibility that the seesaw mechanism and nonthermal leptogenesis can be investigated via primordial non-Gaussianities in the context of a majoron curvaton model. Originating as a massless Nambu-Goldstone boson from the spontaneous breaking of the global baryon (B) minus lepton (L) number symmetry at a scale v B−L , majoron becomes massive when it couples to a new confining sector through anomaly. Acting as a curvaton, majoron produces the observed red-tilted curvature power spectrum without relying on any inflaton contribution, and its decay in the post-inflationary era gives rise to a nonthermal population of right-handed neutrinos that participate in leptogenesis. A distinctive feature of the mechanism is the generation of observable non-Gaussianity, in the parameter space where the red-tilted power spectrum and sufficient baryon asymmetry are produced. We find that the non-Gaussianity parameter f NL ≳ O $$ \mathcal{O} $$ (0.1) is produced for high-scale seesaw (v B−L at O $$ \mathcal{O} $$ (1014−17) GeV) and leptogenesis (M 1 ≳ O $$ \mathcal{O} $$ (106) GeV) where the latter represents the lightest right-handed neutrino mass. While the current bounds on local non-Gaussianity excludes some part of parameter space, the rest can be fully probed by future experiments like CMB-S4, LSST, and 21 cm tomography.https://doi.org/10.1007/JHEP11(2023)182Baryo-and LeptogenesisEarly Universe Particle PhysicsSterile or Heavy Neutrinos |
| spellingShingle | Chee Sheng Fong Anish Ghoshal Abhishek Naskar Moinul Hossain Rahat Shaikh Saad Primordial non-Gaussianity as a probe of seesaw and leptogenesis Journal of High Energy Physics Baryo-and Leptogenesis Early Universe Particle Physics Sterile or Heavy Neutrinos |
| title | Primordial non-Gaussianity as a probe of seesaw and leptogenesis |
| title_full | Primordial non-Gaussianity as a probe of seesaw and leptogenesis |
| title_fullStr | Primordial non-Gaussianity as a probe of seesaw and leptogenesis |
| title_full_unstemmed | Primordial non-Gaussianity as a probe of seesaw and leptogenesis |
| title_short | Primordial non-Gaussianity as a probe of seesaw and leptogenesis |
| title_sort | primordial non gaussianity as a probe of seesaw and leptogenesis |
| topic | Baryo-and Leptogenesis Early Universe Particle Physics Sterile or Heavy Neutrinos |
| url | https://doi.org/10.1007/JHEP11(2023)182 |
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