This paper constructs a GeV-scale self-interacting dark matter model with late scalar decays that simultaneously sets the relic abundance and yields an observable Delta Neff in reach of CMB-S4.
For the case of very small ϵ, the quartic coupling λhϕ serves as the only portal (Fig
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Self-interacting dark matter with observable $\Delta N_{\rm eff}$
This paper constructs a GeV-scale self-interacting dark matter model with late scalar decays that simultaneously sets the relic abundance and yields an observable Delta Neff in reach of CMB-S4.