论文标题
有效理论中有微弱的耦合矢量玻色子暗物质
Feebly coupled vector boson dark matter in effective theory
论文作者
论文摘要
讨论了一种与标准模型（SM）通信的暗物质模型（DM），仅通过抑制尺寸五运算符进行通信。 SM用对称$ u（1）_x \ otimes z_2 $增强，其中$ u（1）_x $被非常重的脱钩标量自发地划分并自发折断。在不间断的$ z_2 $下，稳定的巨大$ u（1）_x $ vector -boson（$ x^μ$）被稳定下来，因此可能是宇宙的DM组成部分。暗区域强度张量$ x^{μν} $夫妇通过存在较重的$ z_2 $奇数量标量$φ$，即$ 1/λ\; x^{μν} b_ {μν}φ$，$λ$是新物理学的比例。在此分析中提倡冻结玻色子暗物质的冻结生产与SM的微弱耦合。讨论了当最高重新温度$ t_ \ text {rh} $下降到DM质量尺度的最高重新温度$ t_ \ text {rh}时出现的所谓紫外线冻结机制的局限性。确定与观察到的DM丰度一致的模型的参数空间。该模型轻松自然地避免了直接和间接的DM搜索。还考虑了大型强子对撞机（LHC）检测的可能性。得出了模型的Stueckelberg公式。
A model of dark matter (DM) that communicates with the Standard Model (SM) exclusively through suppressed dimension five operator is discussed. The SM is augmented with a symmetry $U(1)_X \otimes Z_2$, where $U(1)_X$ is gauged and broken spontaneously by a very heavy decoupled scalar. The massive $U(1)_X$ vector boson ($X^μ$) is stabilized being odd under unbroken $Z_2$ and therefore may contribute as the DM component of the universe. Dark sector field strength tensor $X^{μν}$ couples to the SM hypercharge tensor $B^{μν}$ via the presence of a heavier $Z_2$ odd real scalar $Φ$, i.e. $1/Λ\; X^{μν}B_{μν}Φ$, with $Λ$ being a scale of new physics. The freeze-in production of the vector boson dark matter feebly coupled to the SM is advocated in this analysis. Limitations of the so-called UV freeze-in mechanism that emerge when the maximum reheat temperature $T_\text{RH}$ drops down close to the scale of DM mass are discussed. The parameter space of the model consistent with the observed DM abundance is determined. The model easily and naturally avoids both direct and indirect DM searches. Possibility for detection at the Large Hadron Collider (LHC) is also considered. A Stueckelberg formulation of the model is derived.
