1. A singlet scalar assisted $N_{2}$ Leptogenesis and Pseudo-Scalar Dark Matter
- Author
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Ghosh, Dilip Kumar, Ghosh, Purusottam, Mukherjee, Koustav, and Narendra, Nimmala
- Subjects
High Energy Physics - Phenomenology - Abstract
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., Comment: 5 tables and 18 figures
- Published
- 2024