论文标题
在$ν$ msm中，冻结和冷冻产生的Lepton非对称性
Freeze-in and freeze-out generation of lepton asymmetries after baryogenesis in the $ν$MSM
论文作者
论文摘要
$ν$ msm-通过三个相对较轻的单线majorana fermions $ n_ {1,2,3} $的标准模型扩展，可以生成Lepton不对称的生成，这比观察到的Baryon非对宇宙的Baryon非对称性大几个数量级。 Lepton的不对称性是在$ n_ {2,3} $（GEV地区的群众）的相互作用下产生的中微子混合。这种不对称性可以在冻结，冻结中或以后的重型中性瘦素的腐烂中产生。在这项工作中，我们解决了由重中性瘦素$ n_ {2,3} $在冻结和冻结过程中产生的延迟不对称（LTA）的大小的问题，从而使后来工作的衰退留下了衰退。我们研究了多少不对称性可以生存到与无菌中微子DM产生相关的较低温度。我们发现该LTA可能导致产生大量的暗物质。我们还研究了磁场和阿贝尔手性异常在LTA产生中扮演的角色，在先前的研究中未考虑。我们认为，LTA的生产可以显着增加，并估计这种影响的影响。
The $ν$MSM -- an extension of the Standard Model by three relatively light singlet Majorana fermions $N_{1,2,3}$ -- 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 $N_{2,3}$ (with masses in the GeV region) at temperatures below the sphaleron freeze out $ T \lesssim 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 $T \sim 200$ 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 $N_{2,3}$ 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.
