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 vB−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 fNL ≳ \( \mathcal{O} \)(0.1) is produced for high-scale seesaw (vB−L at \( \mathcal{O} \)(1014−17) GeV) and leptogenesis (M1 ≳ \( \mathcal{O} \)(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.
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Acknowledgments
MHR acknowledges financial support from the STFC Consolidated Grant ST/T000775/1, and from the European Union’s Horizon 2020 Research and Innovation Programme under Marie Skłodowska-Curie grant agreement HIDDeN European ITN project (H2020-MSCA-ITN-2019//860881-HIDDeN). CSF acknowledges the support by Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Contracts No. 2019/11197-6 and 2022/00404-3, Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) under Contract No. 407149/2021-0, and the support from the ICTP through the Associates Programme (2023–2028) while this work was being completed. CSF and AG are grateful to the Mainz Institute for Theoretical Physics (MITP) of the Cluster of Excellence PRISMA+ (Project ID 39083149), for its hospitality and support during “New Proposals for Baryogenesis” workshop where part of the work was carried out. AN acknowledges financial support from the ISRO Respond Grant. We are grateful to Takeshi Kobayashi for discussions.
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Fong, C.S., Ghoshal, A., Naskar, A. et al. Primordial non-Gaussianity as a probe of seesaw and leptogenesis. J. High Energ. Phys. 2023, 182 (2023). https://doi.org/10.1007/JHEP11(2023)182
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DOI: https://doi.org/10.1007/JHEP11(2023)182