Salvato in:
| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2512.14271 |
| Tags: |
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Sommario:
- We study cosmological constraints on the asymmetric mediator scenario, a variant of the scotogenic model that addresses the origins of neutrino masses, dark matter (DM), and the baryon asymmetry. An SU(2)$_L$ doublet scalar $η$ mediates between the visible and dark sectors, while a singlet scalar $σ$ serves as the DM candidate. We evaluate the DM relic abundance by solving the Boltzmann equations including $η$ decay and scattering processes prior to the freeze-out of the $η$ asymmetry, and show Big Bang nucleosynthesis constraints from late-time $η$ decays. Combining the DM abundance and BBN bounds, we find the favored parameter space of this model, for instance, the mediator masses of $m_η\lesssim \mathcal{O}(10)$ TeV.