4.6 Article

Freeze-in and freeze-out generation of lepton asymmetries after baryogenesis in the νMSM

出版社

IOP Publishing Ltd
DOI: 10.1088/1475-7516/2022/04/049

关键词

baryon asymmetry; leptogenesis; cosmic magnetic fields theory; neutrino theory

资金

  1. Swiss National Science Foundation [694896]
  2. [200020B 182864]

向作者/读者索取更多资源

In this study, the magnitude of the late-time asymmetry (LTA) generated by the heavy neutral leptons N-2 and N-3 during their freeze-in and freeze-out processes in the nu-MSM theory is investigated. The results show that this LTA could lead to the production of a significant fraction of dark matter. The role of magnetic fields and the Abelian chiral anomaly in the generation of LTA is also examined.
The nu MSM an extension of the Standard Model by three relatively light singlet Majorana fermions N-1,N-2,N-3 allows for the generation of lepton asymmetry which is several orders of magnitude larger than the observed baryon asymmetry of the Universe. The lepton asymmetry is produced in interactions of N-2,N-3 (with masses in the GeV region) at temperatures below the sphaleron freeze out T less than or similar to 130 GeV and can enhance the cosmological production of dark matter (DM) sterile neutrinos N-1 (with the mass of the keV scale) happening at T similar to 200 MeV due to active-sterile neutrino mixing. This asymmetry can be generated in freeze-in, freeze-out, or later in decays of heavy neutral leptons. In this work, we address the question of the magnitude of the late-time asymmetry (LTA) generated by the heavy neutral leptons N-2,N-3 during their freeze-in and freeze-out, leaving the decays for later work. We study how much of this asymmetry can survive down to the lower temperatures relevant for the sterile neutrino DM creation. We find that this LTA could result in the production of a sizeable fraction of dark matter. We also examine a role played by magnetic fields and the Abelian chiral anomaly in the generation of LTA, not accounted for in the previous studies. We argue that the production of LTA can be increased significantly and make an estimate of the influence of this effect.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.6
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据