论文标题
无菌中微子自我互动：$ H_0 $张力和短基线异常
Sterile neutrino self-interactions: $H_0$ tension and short-baseline anomalies
论文作者
论文摘要
无菌中微子具有EV范围的质量，已被调用，以解释各种短基线（SBL）中微子振荡异常。但是，如果人们认为活跃中微子和无菌中微子之间中微子的振荡，那么这种中微子将在早期的宇宙中得到完全热的振荡，因此将与宇宙学界限发生持久的冲突。在这项研究中，我们首先更新有关EV级无菌中微子的质量和能量密度的宇宙学界限。然后，我们对先前提出的模型进行了更新的研究，在该模型中，无菌中微子伴侣与新的光伪级自由度。与以前的分析一致，我们发现该模型可以很好地适合所有宇宙学数据，并允许在本地宇宙中测得的$ H_0 $的高价值与宇宙微波背景的测量值一致。但是，在这种情况下，新的高$ \ ell $极化数据限制了无菌中微子质量的质量小于1 eV。最后，我们将伪尺度模型上的宇宙学界限与SBL数据的贝叶斯推理分析相结合，并得出结论，狭窄范围内只有1 eV的无菌质量与宇宙学和SBL数据保持一致。
Sterile neutrinos with a mass in the eV range have been invoked as a possible explanation of a variety of short baseline (SBL) neutrino oscillation anomalies. However, if one considers neutrino oscillations between active and sterile neutrinos, such neutrinos would have been fully thermalised in the early universe, and would be therefore in strong conflict with cosmological bounds. In this study we first update cosmological bounds on the mass and energy density of eV-scale sterile neutrinos. We then perform an updated study of a previously proposed model in which the sterile neutrino couples to a new light pseudoscalar degree of freedom. Consistently with previous analyses, we find that the model provides a good fit to all cosmological data and allows the high value of $H_0$ measured in the local universe to be consistent with measurements of the cosmic microwave background. However, new high $\ell$ polarisation data constrain the sterile neutrino mass to be less than approximately 1 eV in this scenario. Finally, we combine the cosmological bounds on the pseudoscalar model with a Bayesian inference analysis of SBL data and conclude that only a sterile mass in narrow ranges around 1 eV remains consistent with both cosmology and SBL data.
