Unified origin of axion and monopole dark matter, and solution to the domain-wall problem
Unified origin of axion and monopole dark matter, and solution to the domain-wall problem
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轴子和单极暗物质的统一起源及畴壁问题的解决
DOI：
10.1103/physrevd.98.043535
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发表时间：
2018
影响因子：
5
通讯作者：
Masaki Yamada
中科院分区：
文献类型：
--
作者：
R. Sato;F. Takahashi;Masaki Yamada
我们提出了一个方案，其中的自发击穿的Peccei-Quinn对称性导致的电子生产。轴子和中微子都对暗物质有贡献，而维滕效应对轴子质量的影响是一个内在的特征。在Kim-Shifman-Vainshtein-Zakharov型轴子模型中，看似不同的真空实际上是由隐藏的规范对称性连接起来的，这使得轴子弦不稳定并分离成两个Alice弦。由于QCD瞬子效应，Alice弦被附着在一个单畴壁上，解决了畴壁问题。这与拉扎里德斯-沙菲机制的精神是一致的，尽管离散的佩切-奎因对称性没有嵌入原始规范对称性的中心。在Dine-Fischler-Srednicki-Zhitnitsky型轴子模型中，通过引入维滕效应避免了畴壁问题。如果Peccei-Quinn对称性被明确地破坏了一小部分，单极子就会获得一个微小的电荷，成为微电荷暗物质。有趣的是，Peccei-Quinn对称性的质量与暗物质的暗度密切相关。
We propose a scenario in which the spontaneous breakdown of the Peccei-Quinn symmetry leads to monopole production. Both the axion and the monopole contribute to dark matter, and the Witten effect on the axion mass is a built-in feature. In the Kim-Shifman-Vainshtein-Zakharov-type axion model, seemingly different vacua are actually connected by the hidden gauge symmetry, which makes the axionic string unstable and separate into two Alice strings. The Alice string is attached to a single domain wall due to the QCD instanton effect, solving the domain-wall problem. This is in the same spirit of the Lazarides-Shafi mechanism, although the discrete Peccei-Quinn symmetry is not embedded into the center of the original gauge symmetry. In the Dine-Fischler-Srednicki-Zhitnitsky-type axion model, the domain-wall problem is avoided by the Witten effect. If the Peccei-Quinn symmetry is explicitly broken by a small amount, monopoles acquire a tiny electric charge and become minicharged dark matter. Interestingly, the quality of the Peccei-Quinn symmetry is closely tied to darkness of dark matter.
影响因子：
8.6
作者：
Akerib, D. S.;Alsum, S.;Zhang, C.
通讯作者：
Zhang, C.