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arXiv · 2105.06089

Inflation connected to the origin of $CP$ violation

Tsuyoshi Hashimoto·Norma Sidik Risdianto·Daijiro Suematsu
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Abstract

We consider a simple extension of the standard model, which could give a solution for its $CP$ issues such as the origin of both CKM and PMNS phases and the strong $CP$ problem. The model is extended with singlet scalars which could cause spontaneous $CP$ violation to result in these phases at low energy regions. The singlet scalars could give a good inflaton candidate if they have a suitable nonminimal coupling with the Ricci scalar. $CP$ issues and inflation could be closely related through these singlet scalars in a natural way. In a case where inflaton is a mixture of the singlet scalars, we study reheating and leptogenesis as notable phenomena affected by the fields introduced in this extension.

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Tsuyoshi Hashimoto, Norma Sidik Risdianto, Daijiro Suematsu. 2021-05-13. Inflation connected to the origin of $CP$ violation. https://doi.org/10.1103/physrevd.104.075034

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