Leptogenesis triggered by a first-order phase transition
Leptogenesis triggered by a first-order phase transition
复制标题
DOI：
10.1007/jhep09(2022)052
复制
发表时间：
2022-06
影响因子：
5.4
通讯作者：
Peisi Huang;Ke-Pan Xie
中科院分区：
文献类型：
--
作者：
Peisi Huang;Ke-Pan Xie
我们提出了一个新的方案leptogenesis，这是由一阶相变（FOPT）触发。右手中微子（RHN）在旧的真空中是无质量的，而它们在新的真空泡中获得了质量，并且与FOPT温度相比质量间隙是巨大的。超相对论气泡壁将RHN扫入气泡，在那里RHN经历快速衰变并产生轻子不对称性，这进一步转化为宇宙的重子不对称性（BAU）。由于RHN在气泡内处于不平衡状态，因此产生的BAU不会受到热浴冲洗的影响。我们首先讨论了这种FOPT leptogenesis机制的一般特征，然后在一个扩展的B − L模型中实现了它。U（1）B − L破裂产生的引力波可以在未来的干涉仪上探测到。
We propose a new scenario of leptogenesis, which is triggered by a first-order phase transition (FOPT). The right-handed neutrinos (RHNs) are massless in the old vacuum, while they acquire a mass in the new vacuum bubbles, and the mass gap is huge compared with the FOPT temperature. The ultra-relativistic bubble walls sweep the RHNs into the bubbles, where the RHNs experience fast decay and generate the lepton asymmetry, which is further converted to the baryon asymmetry of the Universe (BAU). Since the RHNs are out of equilibrium inside the bubble, the generated BAU does not suffer from the thermal bath washout. We first discuss the general feature of such a FOPT leptogenesis mechanism, and then realize it in an extended B− L model. The gravitational waves from U (1) B− L breaking could be detected at the future interferometers.