| Autor: |
Chee Sheng Fong, Anish Ghoshal, Abhishek Naskar, Moinul Hossain Rahat, Shaikh Saad |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
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| Zdroj: |
Journal of High Energy Physics, Vol 2023, Iss 11, Pp 1-25 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
1029-8479 |
| DOI: |
10.1007/JHEP11(2023)182 |
| Popis: |
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. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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