Freeze-In Dark Matter and Leptogenesis: a $ψ'$SM route
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arXiv
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| Format: | Preprint |
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2025
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| author | Afzal, Adeela Roshan, Rishav |
| author_facet | Afzal, Adeela Roshan, Rishav |
| contents | We investigate the possibility of \emph{freeze-in} dark matter production and baryogenesis via leptogenesis in a $ψ'$SM model, which is an $E_6$ extension of the Standard Model, featuring a residual $U(1)_{ψ'}$ gauge symmetry. This symmetry arises from a linear combination of $U(1)_χ$ and $U(1)_ψ$, both of which are subgroups of the $E_6$. The spontaneous breaking of $U(1)_{ψ'}$ symmetry governs the dynamics of a singlet fermion, which serves as a freeze-in dark matter candidate. The dark matter mass arises from dimension-five operators, and a discrete symmetry ensures its stability. We show that freeze-in production from scalar decay can yield the correct relic abundance for dark matter masses between a few MeV to a few hundred GeV. Simultaneously, heavy right-handed neutrinos generate light neutrino masses via the type-I seesaw and produce the observed baryon asymmetry via leptogenesis. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2507_01895 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Freeze-In Dark Matter and Leptogenesis: a $ψ'$SM route Afzal, Adeela Roshan, Rishav High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Theory We investigate the possibility of \emph{freeze-in} dark matter production and baryogenesis via leptogenesis in a $ψ'$SM model, which is an $E_6$ extension of the Standard Model, featuring a residual $U(1)_{ψ'}$ gauge symmetry. This symmetry arises from a linear combination of $U(1)_χ$ and $U(1)_ψ$, both of which are subgroups of the $E_6$. The spontaneous breaking of $U(1)_{ψ'}$ symmetry governs the dynamics of a singlet fermion, which serves as a freeze-in dark matter candidate. The dark matter mass arises from dimension-five operators, and a discrete symmetry ensures its stability. We show that freeze-in production from scalar decay can yield the correct relic abundance for dark matter masses between a few MeV to a few hundred GeV. Simultaneously, heavy right-handed neutrinos generate light neutrino masses via the type-I seesaw and produce the observed baryon asymmetry via leptogenesis. |
| title | Freeze-In Dark Matter and Leptogenesis: a $ψ'$SM route |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2507.01895 |