标题： 中微子混合生成的轻子不对称性与原初氦-4丰度 显示英文标题

标题： On Neutrino-Mixing-Generated Lepton Asymmetry and the Primordial Helium-4 Abundance

摘要： 在本文中，我们讨论中微子振荡下轻子不对称性对大爆炸核合成的影响。我们认为，比0.01小得多的不对称性，尽管不足以直接影响核合成动力学，但可以通过中微子振荡间接显著影响大爆炸核合成。具体来说，它会扭曲中微子谱并改变中微子密度演化和振荡模式（无论是抑制还是增强它们），从而影响元素的原始合成。我们表明，X. Shi 等人论文中的结果，Phys. Rev. D 60, 063002 (1999)，基于只有L > 0.01会影响氦-4生成的假设，是不成立的。相反，给出了来自大爆炸核合成的中微子混合参数的精确限制。 显示英文摘要

摘要： In this article we discuss lepton asymmetry effect on BBN with neutrino oscillations. We argue that asymmetry much smaller than 0.01, although not big enough to influence directly the nucleosynthesis kinetics, can effect considerably BBN indirectly via neutrino oscillations. Namely, it distorts neutrino spectrum and changes neutrino density evolution and the pattern of oscillations (either suppressing or enhancing them), which in turn effect the primordial synthesis of elements. We show that the results of the paper X. Shi et al., Phys. Rev. D 60, 063002 (1999), based on the assumption that only L > 0.01 will influence helium-4 production, are not valid. Instead, the precise constraints on neutrino mixing parameters from BBN are presented.