论文标题
Singlet标量暗物质中的真空结构和电动相过渡
Vacuum structure and electroweak phase transition in singlet scalar dark matter
论文作者
论文摘要
在具有$ \ mathbb {z} _2 $对称性的真实单型标量字段的情况下，除了标准模型中的HIGGS字段外，我们在高温扩展极限中分析了所有可能的一步和两步电动electroweak相变（EWPT）。特别是，我们检查了宇宙中间温度间隔以两步场景的中间温度间隔中的一阶相变的可能性。在所有情况下，我们都提供有关模型参数的必要条件，以在高温近似中可能解决一阶或二阶转变。我们表明，在此模型中的所有可能的EWPT通道中，只有两步相转换$（0,0）\ to（0，w）\ to（v，0）$可以是一阶类型，无论是在第一阶还是第二步中。 EWPT获得的条件与暗物质（DM）和对撞机的约束面临。结果表明，二阶一步$（0,0）\ to（v，0）$方案可以逃避DM约束，但未来的煤矿无法访问。两步的一阶EWPT方案$（0,0）\ to（0，w）\ to（v，0）$，除小型DM群众外，被直接检测实验Xenon1t/lux所排除在外，但在未来的colliders ILC/TLEP中可以访问。
In the presence of a real singlet scalar field with $\mathbb{Z}_2$ symmetry in addition to the Higgs field in the Standard Model, we analytically investigate all possible one-step and two-step electroweak phase transitions (EWPT) in the high-temperature expansion limit. In particular, we examine the possibility of a first-order phase transition in an intermediate temperature interval of the universe for two-step scenarios. In all scenarios, we provide with necessary conditions on the parameters of the model to address a first- or second-order phase transition if ever possible in the high-temperature approximation. We show that among all possible EWPT channels in this model, only the two-step phase transition $(0,0)\to(0,w)\to (v,0)$ can be of first-order type, either in the first or second step. The conditions obtained for EWPT is confronted with the dark matter (DM) and collider constraints. It is shown that the second-order one-step $(0,0)\to(v,0)$ scenario can evade the DM constraints, but it is not accessible to future colliders. The two-step first-order EWPT scenario $(0,0)\to(0,w)\to (v,0)$, except for small DM masses, is excluded by direct detection experiments XENON1T/LUX, but it is accessible in future colliders ILC/TLEP.
