论文标题
复兴凯夫无菌中微子暗物质
Reviving keV sterile Neutrino Dark Matter
论文作者
论文摘要
我们提出了一种新的生产机制，用于kev无菌中微子暗物质，该机制既不依赖于无菌和主动中微子之间的振荡，也不依赖于额外的较重颗粒的衰减。相反，暗物质中微子是由热冻结产生的，就像典型的wimp一样。挑战在于平衡大型的Yukawa耦合，从而使无菌中微子一方面在早期的宇宙中进行热化，而Yukawa的耦合则足够小，以便它们在宇宙学尺度上稳定。我们通过实施不同的Yukawa耦合来解决这个问题。我们通过在SM上使用三局中微子Seesaw扩展并将其嵌入具有单一黄酮的Froggatt-Nielsen模型中来实现这一目标。由于Flavon的VEV在Electroweak相跃迁过程中发生了变化，因此Fermions的有效Yukawa耦合在相变之前和之后具有不同的值，因此允许成功的暗物质创世纪。此外，风味结构中的层次结构得到了缓解，光中微子质量的起源是通过Seesaw和Froggatt-Nielsen机制的相互作用来解释的。
We propose a new production mechanism for keV sterile neutrino dark matter which relies neither on the oscillations between sterile and active neutrinos nor on the decay of additional heavier particles. The dark matter neutrinos are instead produced by thermal freeze-out, much like a typical WIMP. The challenge consists in balancing a large Yukawa coupling so that the sterile neutrinos thermalize in the early universe on the one hand, and a small enough Yukawa coupling such that they are stable on cosmological scales on the other. We solve this problem by implementing varying Yukawa couplings. We achieve this by using a three-sterile neutrino seesaw extension to the SM and embedding it in a Froggatt-Nielsen model with a single flavon. Because the vev of the flavon changes during the electroweak phase transition, the effective Yukawa couplings of the fermions have different values before and after the phase transition, thus allowing for successful dark matter genesis. Additionally, the hierarchy in the flavour structure is alleviated and the origin of the light neutrino masses are explained by the interplay of the seesaw and Froggatt-Nielsen mechanisms.
