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arXiv · 2409.17067

A singlet scalar assisted $N_{2}$ Leptogenesis and Pseudo-Scalar Dark Matter

Dilip Kumar Ghosh·Purusottam Ghosh·Koustav Mukherjee·Nimmala Narendra
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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.

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Dilip Kumar Ghosh, Purusottam Ghosh, Koustav Mukherjee, Nimmala Narendra. 2024-09-25. A singlet scalar assisted $N_{2}$ Leptogenesis and Pseudo-Scalar Dark Matter. https://doi.org/10.1140/epjc%2Fs10052-025-14937-w

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