2021/05/31 by T. Hashimoto, Tsuyoshi Hashimoto, Norma Sidik Risdianto +1
Mathematics · Physics and Astronomy · #Axion #CP violation #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark matter #Geometry #Inflation (cosmology) #Inflaton #Leptogenesis #Lepton #Mathematics #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Quantum mechanics #Scalar (mathematics) #Singlet state #Theoretical physics #hep-ph
paper · pdf · doi:10.1103/physrevd.104.075034
41 pages, 6 figures, several clarifications, one figure and references are added, a version accepted for publication
arxiv created 2021/10/14 · openalex publication_date 2021/10/27 · openalex created_date 2021/11/08 · arxiv updated 2021/11/10 · openalex updated_date 2026/07/21
We consider a simple extension of the standard model, which could give a solution for its CP issues such as the origin of both Cabibbo-Kobayashi-Maskawa (CKM) and Pontecorvo-Maki-Nakagawa-Sakata (PMNS) phases and the strong CP problem. The model is extended with singlet scalars which allow the introduction of the Peccei-Quinn symmetry and 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 the inflaton is a mixture of the singlet scalars, we study reheating and leptogenesis as notable phenomena affected by the fields introduced in this extension.