Intimate Relationship between Sterile Neutrino Dark Matter andΔNeff,Physical Review Letters

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Intimate Relationship between Sterile Neutrino Dark Matter andΔNeff
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-07-20 , DOI: 10.1103/physrevlett.127.041101
Kevin J Kelly ₁ , Manibrata Sen _{2,

3} , Yue Zhang ₄

Affiliation

The self-interacting neutrino hypothesis is well motivated for addressing the tension between the origin of sterile neutrino dark matter and indirect detection constraints. It can also result in a number of testable signals from the laboratories to the cosmos. We show that, in a broad class of models, where the sterile neutrino dark matter relic density is generated by a light neutrinophilic mediator, there must be a lower bound on the amount of extra radiation in early Universe, in particular,

Δ N_{eff} > 0.12

at the cosmic microwave background (CMB) epoch. This lower bound will be further strengthened with an improved x-ray search at the Athena observatory. Such an intimate relationship will be unambiguously tested by the upcoming CMB Stage 4 project.

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