Dark matter stability without new symmetries
Dark matter stability without new symmetries
复制标题
没有新对称性的暗物质稳定性
DOI：
10.1103/physrevd.90.063509
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发表时间：
2014
影响因子：
5
通讯作者：
A. Ibarra
中科院分区：
文献类型：
--
作者：
O. Catà;A. Ibarra
暗物质的稳定性通常是通过在粒子物理学标准模型之外施加额外的对称性来实现的。在本文中，我们提出了一个框架，暗物质的稳定性出现的标准模型对称性的结果。暗物质粒子是反对称张量场（类似于QCD中自旋为1的介子），在标准模型规范群下是单态。拉格朗日量具有一个偶然的Z_2对称性，这使得暗物质在宇宙学时间尺度上是稳定的。与标准模型场的相互作用通过希格斯门进行，这使得观测到的暗物质丰度通过热冻结产生。我们还讨论了在直接探测实验中观察这种暗物质粒子的前景。
The stability of dark matter is normally achieved by imposing extra symmetries beyond those of the Standard Model of Particle Physics. In this paper we present a framework where the dark matter stability emerges as a consequence of the Standard Model symmetries. The dark matter particle is an antisymmetric tensor field (analogous to the one used for spin-1 mesons in QCD), singlet under the Standard Model gauge group. The Lagrangian possesses an accidental $Z_2$ symmetry which makes the dark matter stable on cosmological time scales. Interactions with the Standard Model fields proceed through the Higgs portal, which allows the observed dark matter abundance to be generated via thermal freeze-out. We also discuss the prospects for observing this dark matter particle in direct detection experiments.