Early dark energy by a dark Higgs field and axion-induced nonthermal trapping
Early dark energy by a dark Higgs field and axion-induced nonthermal trapping
复制标题
暗希格斯场和轴子诱导的非热捕获的早期暗能量
DOI：
10.1103/physrevd.107.063016
复制
发表时间：
2023
影响因子：
5
通讯作者：
Yin Wen
中科院分区：
文献类型：
--
作者：
Nakagawa Shota;Takahashi Fuminobu;Yin Wen
我们提出了一种早期暗能量（EDE）的新场景，其中暗希格斯场被困在原点。为了保持这种暗希格斯粒子被捕获直到物质-辐射相等，我们使用轴子相干振荡非热产生的暗光子，它比热质量具有更强的捕获效应。当捕获结束时，暗希格斯粒子迅速衰变成暗光子，然后以辐射的形式红移。事实上，暗光子是自相互作用的暗辐射，如果自耦合足够小，暗希格斯场也可以处于热平衡。在某些情况下，这些粒子可以充当韦斯-祖米诺暗辐射。暗希格斯 EDE 场景适用于普通的墨西哥帽势，并且暗希格斯从一开始就自然地位于原点，因为它是对称性增强点。因此，与轴子 EDE 不同，不需要对初始条件进行精细的势或微调。有趣的是，轴子不仅产生暗光子，还能解释暗物质。我们找到了轴子衰变常数和轴子质量的可行参数区域，其中暗物质和张力可以同时解释。我们还讨论了轴子-光子耦合存在下轴子的可检测性，并表明轴子可以是 QCD 轴子。
We propose a new scenario of early dark energy (EDE) with a dark Higgs field trapped at the origin. To keep this dark Higgs trapped until around the matter-radiation equality, we use dark photons produced nonthermally by coherent oscillations of axions, which have a much stronger trapping effect than thermal mass. When the trapping ends, the dark Higgs quickly decays into dark photons, which are then redshifted as radiation. In fact, dark photons are self-interacting dark radiation, and the dark Higgs field can also be in thermal equilibrium if its self-coupling is small enough. In some cases, these particles can act as the Wess-Zumino dark radiation. The dark Higgs EDE scenario works well for an ordinary Mexican-hat potential, and the dark Higgs naturally sits at the origin from the beginning, since it is the symmetry-enhanced point. Thus, unlike the axion EDE, there is no need for elaborate potentials or fine-tuning with respect to the initial condition. Interestingly, the axion not only produces dark photons, but also explains dark matter. We find the viable parameter region of the axion decay constant and the axion mass where dark matter and thetension can be simultaneously explained. We also discuss the detectability of the axion in the presence of axion-photon coupling, and show that the axion can be the QCD axion.