论文标题
无菌中微子暗物质：主动中性缺陷的影响
Sterile neutrino dark matter: Impact of active-neutrino opacities
论文作者
论文摘要
Kev无菌中心抗物的共振产生主要发生在早期宇宙的QCD时期。有人认为，它可能会受到主动中微子的不透明（或阻尼率）的强烈影响，这些中微子接受了非扰动QCD贡献。我们发现，对于Lepton不对称$ n_ {l_α} /s $ $ 10 ^ {-6} $低于$ 10 ^ {-6} $显着影响无菌 - 中性群落的产量，但是对于较大的不对称性，这对于产生大量的暗物质是不敏感的，对不明显性的变化是不敏感的。因此，在160 MEV左右的温度下，非扰动的QCD贡献不会影响这种暗物质情况。我们比以前的研究获得了更大的无菌 - 中性分子的产量，因此从大爆炸核合成中的活性微分混合角度较弱。
The resonant production of keV sterile-neutrino dark matter mainly takes place during the QCD epoch of the early universe. It has been argued that it could be strongly affected by the opacities (or damping rates) of active neutrinos, which receive non-perturbative QCD-contributions. We find that for lepton asymmetries $ n_{ L_α} /s $ below $ 10 ^ { -6 } $ the opacities significantly affect the sterile-neutrino yield, but that for larger asymmetries, which are necessary for producing a significant fraction of the dark matter, the yield is insensitive to changes of the opacities. Thus non-perturbative QCD contributions to the opacities at temperatures around 160 MeV will not affect this dark matter scenario. We obtain larger sterile-neutrino yields than previous studies, and thus weaker lower limits on the active-sterile mixing angle from Big Bang Nucleosynthesis.
