Topological Nambu monopole in two Higgs doublet models
Topological Nambu monopole in two Higgs doublet models
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两个希格斯双峰模型中的拓扑南部单极子
DOI：
10.1016/j.physletb.2020.135220
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Muneto Nitta
中科院分区：
文献类型：
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作者：
Minoru Eto;Yu Hamada;Masafumi Kurachi;Muneto Nitta
我们证明了拓扑Nambu单极子作为两个希格斯双重模型中大范围参数的正则解存在，而不是标准模型只允许非拓扑Nambu单极子存在。我们分析了具有全局U(1)对称性和离散对称z2的希格斯势。单极子由两个拓扑Z弦（Z磁通管）从两侧连接。尽管存在平凡的第二同伦群，但Z弦的离散对称z2与非平凡的第一同伦群在拓扑上保证了拓扑的稳定性。在解析构造了这种构型的渐近形式之后，我们基于三维数值模拟明确地构造了运动方程的解，其中在远距离上从单极子发出的球形磁通量在单极子附近发生变形。由于单极子预计在当前的宇宙中是丰富的，它们可能在当前的单极子搜索中被观察到。
We show that a topological Nambu monopole exists as a regular solution for a large range of parameters in two Higgs doublet models, contrary to the standard model admitting only non-topological Nambu monopoles. We analyze a Higgs potential with a global U (1) symmetry and a discrete symmetry Z 2. The monopole is attached by two topological Z strings (Z flux tubes) from both sides. Despite of a trivial second homotopy group, the discrete symmetry Z 2 together with a non-trivial first homotopy group for Z strings topologically ensures the topological stability. After analytically constructing an asymptotic form of such a configuration, we explicitly construct a solution of the equation of motion based on a 3D numerical simulation, in which magnetic fluxes spherically emanating from the monopole at large distances are deformed in the vicinity of the monopole. Since the monopoles are expected to be abundant in the present universe, they might be observed in the current monopole searches.