论文标题
特定于风味的互动有利于早期宇宙中强烈的中微子自我耦合
Flavor-specific Interaction Favors Strong Neutrino Self-coupling in the Early Universe
论文作者
论文摘要
风味 - 普遍中微子的自我交互已被证明可以缓解从早期和晚期数据中测得的哈勃常数值之间的张力。我们引入了一个自我交互结构，该结构在三个主动中微子框架中特定于风味。这是由于对几个实验室实验的电子和MUON中微子之间的新秘密相互作用的严格限制所激发的。我们的研究表明存在强烈的相互作用模式，这意味着在物质辐射平等之前，中微子的滞后。利用耦合强度与其他宇宙学参数的脱落性，我们解释了这种新模式的起源，这是因为CMB数据中的某些特征更好。我们发现，如果三种活性中微子口味中只有一个或两个相互作用，那么相对于风味 - 普遍的情况，强烈相互交互的中微子模式的统计显着性大大增加。但是，在特定风味的情况下，这种相互作用模式的耦合强度的核心值不会发生任何可观的变化。我们还简要分析了三种以上中微子物种的场景，其中只有一种是自我相互作用。在任何情况下，我们都发现一个足够大的哈勃常数可以解决所谓的哈勃张力。
Flavor-universal neutrino self-interaction has been shown to ease the tension between the values of the Hubble constant measured from early and late Universe data. We introduce a self-interaction structure that is flavor-specific in the three active neutrino framework. This is motivated by the stringent constraints on new secret interactions among electron and muon neutrinos from several laboratory experiments. Our study indicates the presence of a strongly interaction mode which implies a late-decoupling of the neutrinos just prior to matter radiation equality. Using the degeneracy of the coupling strength with other cosmological parameters, we explain the origin of this new mode as a result of better fit to certain features in the CMB data. We find that if only one or two of the three active neutrino flavors are interacting, then the statistical significance of the strongly-interacting neutrino mode increases substantially relative to the flavor-universal scenario. However, the central value of the coupling strength for this interaction mode does not change by any appreciable amount in the flavor-specific cases. We also briefly analyze a scenario with more than three neutrino species of which only one is self-interacting. In none of the cases, we find a large enough Hubble constant that could resolve the so-called Hubble tension.
