Year: 2025
Type: article
Abstract: We study the Leptogenesis and Dark Matter in the presence of an extra singlet complex scalar field in an extended discrete $$\mathcal {Z_{\textrm{3}}}$$ Z 3 symmetry. The vacuum expectation value of the new scalar spontaneously breaks the $$\mathcal {Z_{\textrm{3}}}$$ Z 3 symmetry. A remnant CP-like $$\mathcal {Z_{\textrm{2}}}$$ Z 2 symmetry stabilizes the imaginary part of the complex scalar field, which can act as a pseudo-Goldstone Dark Matter. 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.
Source: The European Physical Journal C
Authors: Dilip Kumar Ghosh, Purusottam Ghosh, Koustav Mukherjee, Nimmala Narendra
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4415656927