| Texto completo | |
| Autor(es): |
Fong, Chee Sheng
;
Ghoshal, Anish
;
Naskar, Abhishek
;
Rahat, Moinul Hossain
;
Saad, Shaikh
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of High Energy Physics; v. N/A, n. 11, p. 25-pg., 2023-11-24. |
| Resumo | |
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) greater than or similar to O(0.1) is produced for high-scale seesaw (v(B-L) at O(10(14-17)) GeV) and leptogenesis (M1 greater than or similar to O(10(6)) 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. (AU) | |
| Processo FAPESP: | 22/00404-3 - Bariogênese e matéria escura em cosmologia não padrão |
| Beneficiário: | Chee Sheng Fong |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 19/11197-6 - Teste de precisão de bariogênese |
| Beneficiário: | Chee Sheng Fong |
| Modalidade de apoio: | Auxílio à Pesquisa - Jovens Pesquisadores |