arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1608.01336hep-phastro-ph.CO
收藏

轻子非对称宇宙中的中微子味变换

Neutrino flavor transformation in the lepton-asymmetric universe

Lucas Johns, Mattia Mina, Vincenzo Cirigliano, Mark W. Paris, George M. Fuller

摘要:

我们研究了轻子不对称条件下早期宇宙中中微子的味转换,重点研究了具有1 - 3个混合参数的双味系统。我们确定了五个不同的制度,出现在一个近似的治疗忽略碰撞的初始轻子不对称性在高温下的变化,从相当于当前的轻子数的限制值的中微子中微子前向散射潜力是可以忽略不计的。在这些状态下发生的特征现象是(1)大的同步振荡,(2)最小的味道转换,(3)不对称(中微子或反中微子)MSW,(4)部分MSW,和(5)对称MSW。我们检查我们的数值结果的绝热性的框架中,我们说明了它们是如何修改碰撞阻尼。最后,我们指出在早期宇宙中存在的物质中微子共振,并表明它们遭受非绝热性。

英文摘要:

We investigate neutrino flavor transformation in the early universe in the presence of a lepton asymmetry, focusing on a two-flavor system with 1 - 3 mixing parameters. We identify five distinct regimes that emerge in an approximate treatment neglecting collisions as the initial lepton asymmetry at high temperature is varied from values comparable to current constraints on the lepton number down to values at which the neutrino-neutrino forward-scattering potential is negligible. The characteristic phenomena occurring in these regimes are (1) large synchronized oscillations, (2) minimal flavor transformation, (3) asymmetric (neutrino- or antineutrino-only) MSW, (4) partial MSW, and (5) symmetric MSW. We examine our numerical results in the framework of adiabaticity, and we illustrate how they are modified by collisional damping. Finally, we point out the existence of matter-neutrino resonances in the early universe and show that they suffer from non-adiabaticity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑