Sneutrinos as two inflatons and curvaton and leptogenesis

We argue that sneutrinos can be embedded in a multi-field inflation framework where two inflatons and a curvaton simultaneously contribute to primordial fluctuations, which is consistent with current constraints on the spectral index and the tensor-to-scalar ratio from Planck and BICEP/Keck 2018. We also show that the same framework can also explain the baryon asymmetry of the Universe via leptogenesis realized by the decay of the lightest sneutrino. We investigate the parameter range for the scenario to work such as that of sneutrino masses. In particular, we show that the tensor-to-scalar ratio should be larger than 10-4 for a successful scenario.

Automated summary

In this study, we propose a multi-field inflation framework that includes two inflatons and a curvaton contributing to primordial fluctuations, consistent with current constraints. We also show that this framework can explain the baryon asymmetry of the Universe through leptogenesis via the decay of the lightest sneutrino. The parameter range, including sneutrino masses, for the scenario to work is investigated, with the tensor-to-scalar ratio found to be larger than 10-4 for successful implementation.