Exophobic quasi-realistic heterotic string vacua

Exophobic quasi-realistic heterotic string vacua
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疏散准现实异种异质弦真空

DOI:
10.1016/j.physletb.2009.12.033
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发表时间:
2010
期刊:
影响因子:
4.4
通讯作者:
Assel B
Assel B
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Assel B

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我们证明了没有无质量奇异磁场的杂化弦真空的存在。在k=1杂化弦模型中,需要用威尔逊线破坏非阿贝尔肠道对称性,同时保持弱超电荷的肠道嵌入和肠道预测sin2θw(MGUT)=3/8,这必然意味着模型中含有分数电荷的态。这样的状态受到观测的严格限制,必须受到限制或足够大的质量和稀释。我们构造了第一个准现实杂化弦模型,在该模型中,奇异态不会出现在无质量谱中,而是必然地存在于大质量谱中。SO(10)肠道对称性被打破到Pati-Salam子群。我们的PS杂化弦模型包含足够的Higgs表示来打破肠道和电弱对称,以及可以用于缺失伙伴机制的彩色Higgs三联体。通过对Pati-Salam真空空间的统计抽样,我们证明了丰富的准现实三代模型是完全没有无质量奇异的,使得在这个模型空间中获得现实的汤川耦合是可能的。
We demonstrate the existence of heterotic string vacua that are free of massless exotic fields. The need to break the non-Abelian GUT symmetries in k=1 heterotic string models by Wilson lines, while preserving the GUT embedding of the weak hypercharge and the GUT prediction sin2θw(MGUT)=3/8, necessarily implies that the models contain states with fractional electric charge. Such states are severely restricted by observations, and must be confined or sufficiently massive and diluted. We construct the first quasi-realistic heterotic string models in which the exotic states do not appear in the massless spectrum, and only exist, as they must, in the massive spectrum. The SO(10) GUT symmetry is broken to the Pati–Salam subgroup. Our PS heterotic string models contain adequate Higgs representations to break the GUT and electroweak symmetry, as well as colour Higgs triplets that can be used for the missing partner mechanism. By statistically sampling the space of Pati–Salam vacua we demonstrate the abundance of quasi-realistic three generation models that are completely free of massless exotics, rendering it plausible that obtaining realistic Yukawa couplings may be possible in this space of models.
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