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• W3136186793 abstract "The existence of feebly interacting massive particles (FIMPs) could have significant implications on the effective number of relativistic species $N_mathrm{eff}$ in the early Universe. In this work, we investigate in detail how short-lived FIMPs that can decay into neutrinos affect $N_mathrm{eff}$ and highlight the relevant effects that govern its evolution. We show that even if unstable FIMPs inject most of their energy into neutrinos, they may still decrease $N_{mathrm{eff}}$, and identify neutrino spectral distortions as the driving power behind this effect. As a case study, we consider Heavy Neutral Leptons (HNLs) and indicate which regions of their parameter space increase or decrease $N_{mathrm{eff}}$. Moreover, we derive bounds on the HNL lifetime from the Cosmic Microwave Background and comment on the possible role that HNLs could play in alleviating the Hubble tension." @default.
• W3136186793 created "2021-03-29" @default.
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• W3136186793 date "2021-03-17" @default.
• W3136186793 modified "2023-09-27" @default.
• W3136186793 title "When FIMPs Decay into Neutrinos: The $N_mathrm{eff}$ Story" @default.
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• W3136186793 hasPublicationYear "2021" @default.
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