A model of pseudo-Nambu?Goldstone dark matter from a softly broken <i>SU</i>(2) global symmetry with a <i>U</i>(1) gauge symmetry
A model of pseudo-Nambu?Goldstone dark matter from a softly broken <i>SU</i>(2) global symmetry with a <i>U</i>(1) gauge symmetry
复制标题
来自具有 <i>U</i>(1) 规范对称性的软破缺 <i>SU</i>(2) 全局对称性的伪 Nambu?Goldstone 暗物质模型
DOI：
10.1093/ptep/ptad021
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发表时间：
2023
影响因子：
3.5
通讯作者：
Hamada Yu
中科院分区：
文献类型：
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作者：
Abe Tomohiro;Hamada Yu
提出了一种准Nambu-Goldstone暗物质(DM)模型。我们假设暗区存在Ansu(2)总体对称性和Au(1)X规范对称性，当标量场发展到真空期望值后，它们自发地分裂为Au(1)D整体对称性。我们增加了一个软对称破缺项，它显式地将SU(2)全局对称破坏为U(1)全局对称。我们的模型预测了U(1)D整体对称性下稳定的复杂PNG粒子。PNG DM模型的优点之一是可以解释当前直接检测实验的零结果。由于Nambu-Goldstone玻色子的低能行为，小动量转移抑制了散射幅度。在我们的模型中，软对称破缺项是唯一确定的。这就是我们的模型相对于以前的一些工作的优势，在这些工作中，一些软对称破缺项不能被禁止，而是被简单地假设为不存在，以避免直接检测实验的约束。对PNG DM的热遗迹丰度进行了计算，发现该模型在一定的微扰整体性约束下可以解释DM能量密度的测量值。
A model of the pseudo-Nambu–Goldstone (pNG) dark matter (DM) is proposed. We assume that there is anSU(2)gglobal symmetry and aU(1)Xgauge symmetry in the dark sector, and they are spontaneously broken into aU(1)Dglobal symmetry after a scalar field develops a vacuum expectation value. We add a soft symmetry-breaking term that breaks theSU(2)gglobal symmetry into theU(1)gglobal symmetry explicitly. Our model predicts a stable complex pNG particle under theU(1)Dglobal symmetry. One of the virtues of the pNG DM models is that the models can explain the current null results of the direct detection experiments. The small momentum transfer suppresses the scattering amplitudes thanks to the low-energy behavior of the Nambu–Goldstone boson. In our model, the soft symmetry-breaking term is uniquely determined. This is the advantage of our model compared to some earlier works in which some soft symmetry-breaking terms cannot be forbidden but are simply assumed to be absent to avoid the constraints from the direct detection experiments. We calculate the thermal relic abundance of the pNG DM and find that the model can explain the measured value of the DM energy density under some constraints from perturbative unitarity.