论文标题
带有SU（2）黑暗扇区的Electroweak相过渡
Electroweak Phase Transition with an SU(2) Dark Sector
论文作者
论文摘要
我们考虑了一个非亚伯式的黑暗SU（2）$ _ {\ rm d} $模型，其中黑暗扇区夫妇通过Higgs门户与标准模型（SM）夫妇。我们使用$ z_2 $对称的黑暗扇区标量的两个不同方案进行了调查，Higgs门户相互作用可以引入SM Higgs Boson和SM Singlet标量之间的混合。我们利用HIGGS信号速率的现有对撞机结果，直接的HIGGS搜索和Electroweak Precision可观察物来限制模型参数。 $ \ text {su（2）} _ {\ text {d}} $部分分解为$ \ text {u（1）} _ {\ text {d}} $ gauge组，由标量扇区进行。 The resulting two stable massive dark gauge bosons and pseudo-Goldstone bosons can be viable cold dark matter candidates, while the massless gauge boson from the unbroken $\text{U(1)}_{\text{D}}$ subgroup is a dark radiation and can introduce long-range attractive dark matter (DM) self-interaction, which can alleviate the small-scale structure issues.我们详细研究了由黑暗扇区对称性破坏触发的强一阶相变和重力波（GW）生产的模式，并进一步评估了几个建议的空间干涉仪任务的信噪比。我们得出的结论是，黑暗扇区中的丰富物理学可以通过围栏，DM实验和GW干涉仪的当前和将来的测量值观察到。
We consider a non-Abelian dark SU(2)$_{\rm D}$ model where the dark sector couples to the Standard Model (SM) through a Higgs portal. We investigate two different scenarios of the dark sector scalars with $Z_2$ symmetry, with Higgs portal interactions that can introduce mixing between the SM Higgs boson and the SM singlet scalars in the dark sector. We utilize the existing collider results of the Higgs signal rate, direct heavy Higgs searches, and electroweak precision observables to constrain the model parameters. The $\text{SU(2)}_{\text{D}}$ partially breaks into $\text{U(1)}_{\text{D}}$ gauge group by the scalar sector. The resulting two stable massive dark gauge bosons and pseudo-Goldstone bosons can be viable cold dark matter candidates, while the massless gauge boson from the unbroken $\text{U(1)}_{\text{D}}$ subgroup is a dark radiation and can introduce long-range attractive dark matter (DM) self-interaction, which can alleviate the small-scale structure issues. We study in detail the pattern of strong first-order phase transition and gravitational wave (GW) production triggered by the dark sector symmetry breaking, and further evaluate the signal-to-noise ratio for several proposed space interferometer missions. We conclude that the rich physics in the dark sector may be observable with the current and future measurements at colliders, DM experiments, and GW interferometers.
