Family Unification via Quasi-Nambu-Goldstone Fermions in String Theory
Family Unification via Quasi-Nambu-Goldstone Fermions in String Theory
复制标题
通过弦理论中的准南部戈德斯通费米子实现家庭统一
DOI：
10.1093/ptep/ptt019
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
矢田雅哉
中科院分区：
文献类型：
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作者：
溝口俊弥;矢田雅哉
已知在特殊群（E7orE8）上的一些超对称非线性sigma模型产生的物质场几乎是建立现象学模型所必需的最小内容，包括三个手性族和一个希格斯多重子。我们探索了在异质弦理论中实现这种家族统一的可能性，其中我们关注的自发破缺对称性是与嵌入规范束中的自旋束的全局方向变化相关的对称性，在磁场源存在的情况下，这是不可忽视的。我们在一个简单的模型中表明，它确实在缺陷上产生了类似于畴壁费米子的手性物质场，并将手性零模谱与sigma模型进行了比较。这个设置被简化为一个类似于轨道古特或大尺度-希格斯统一模型的假设系统，其中z2识别的起源被认为是由阿蒂亚-希钦流形的螺栓引起的。
Some of the supersymmetric nonlinear sigma models on exceptional groups (E7orE8) are known to yield almost minimal necessary content of matter fields for phenomenological model building, including three chiral families and a Higgs multiplet. We explore a possible realization of such a family unification in heterotic string theory, where the spontaneously broken symmetry that we focus on is the one associated with the change of global orientation of the spin bundle embedded in the gauge bundle, which cannot be ignored in the presence of a magnetic source of theBfield. We show in a simple model that it indeed gives rise to chiral matter fields on the defect similarly to the domain-wall fermions, and compare the chiral zero mode spectrum with the sigma model. The setup is reduced to a system similar to that postulated in the orbifold GUT or the grand gauge–Higgs unification model, where the origin ofZ2identification is accounted for as arising from the bolt of the Atiyah–Hitchin manifold.