论文标题
来自极为金属贫困星系的非零Lepton不对称的指示
Indications for a Nonzero Lepton Asymmetry from Extremely Metal-Poor Galaxies
论文作者
论文摘要
Subaru调查的近红外光谱（EMPG）的近红外光谱法可能对氦4进行了测量，这可能指向早期宇宙中的新难题。我们利用这种新的氦测量值，以及原始氘的百分比确定，以评估大爆炸核合成（BBN）时代的非消失Lepton不对称的适应症，并特别关注了不确定性在核反应网络中的作用。尖端的贝叶斯分析重点介绍了新测量的EMPG的作用，并与宇宙微波背景的信息共同表明，存在非零的Lepton不对称的存在于$2σ$级别，为$λ$ CDM以上的宇宙学的提示提供了提示。我们讨论了在早期宇宙中始终实现的大量麻血不对称的条件。
The recent measurement of helium-4 from the near-infrared spectroscopy of extremely metal-poor galaxies (EMPGs) by the Subaru Survey may point to a new puzzle in the Early Universe. We exploit this new helium measurement together with the percent-level determination of primordial deuterium, to assess indications for a non-vanishing lepton asymmetry during the Big Bang Nucleosynthesis (BBN) era, paying particular attention to the role of uncertainties in the nuclear reaction network. A cutting-edge Bayesian analysis focused on the role of the newly measured EMPGs, jointly with information from the Cosmic Microwave Background, suggests the existence of a nonzero lepton asymmetry at around the $2 σ$ level, providing a hint for cosmology beyond $Λ$CDM. We discuss conditions for a large total lepton asymmetry to be consistently realized in the Early Universe.
