A singlet scalar assisted $N_{2}$ Leptogenesis and Pseudo-Scalar Dark Matter
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866918179828137984 |
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| author | Ghosh, Dilip Kumar Ghosh, Purusottam Mukherjee, Koustav Narendra, Nimmala |
| author_facet | Ghosh, Dilip Kumar Ghosh, Purusottam Mukherjee, Koustav Narendra, Nimmala |
| contents | We study the Leptogenesis and Dark Matter in the presence of an extra singlet complex scalar field in an extended discrete $\mathcal{Z_{\rm 3}}$ symmetry. The vacuum expectation value of the new scalar spontaneously breaks the $\mathcal{Z_{\rm 3}}$ symmetry. A remnant CP-like $\mathcal{Z_{\rm 2}}$ symmetry stabilizes the imaginary part of the complex scalar field which can act as a pseudo-Goldstone DM. The real part of the complex scalar couples to RHN opens up new decay channels which can lead to a larger CP-violation in generating the lepton asymmetry. Thus the singlet complex scalar plays a crucial role in understanding the Leptogenesis and Dark Matter parameter space. This singlet complex scalar is also responsible for the First-Order Phase Transition (FOPT) which may provide observable stochastic Gravitational wave signatures. We discuss the possible correlations among these three phenomena. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_17067 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A singlet scalar assisted $N_{2}$ Leptogenesis and Pseudo-Scalar Dark Matter Ghosh, Dilip Kumar Ghosh, Purusottam Mukherjee, Koustav Narendra, Nimmala High Energy Physics - Phenomenology We study the Leptogenesis and Dark Matter in the presence of an extra singlet complex scalar field in an extended discrete $\mathcal{Z_{\rm 3}}$ symmetry. The vacuum expectation value of the new scalar spontaneously breaks the $\mathcal{Z_{\rm 3}}$ symmetry. A remnant CP-like $\mathcal{Z_{\rm 2}}$ symmetry stabilizes the imaginary part of the complex scalar field which can act as a pseudo-Goldstone DM. The real part of the complex scalar couples to RHN opens up new decay channels which can lead to a larger CP-violation in generating the lepton asymmetry. Thus the singlet complex scalar plays a crucial role in understanding the Leptogenesis and Dark Matter parameter space. This singlet complex scalar is also responsible for the First-Order Phase Transition (FOPT) which may provide observable stochastic Gravitational wave signatures. We discuss the possible correlations among these three phenomena. |
| title | A singlet scalar assisted $N_{2}$ Leptogenesis and Pseudo-Scalar Dark Matter |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2409.17067 |