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arXiv 0910.3697hep-thhep-ph
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疏外准实在杂种优势弦线

Exophobic Quasi-Realistic Heterotic String Vacua

Benjamin Assel, Kyriakos Christodoulides, Alon E. Faraggi, Costas Kounnas, John Rizos

摘要:

我们证明了不含无质量奇异场的异质弦真空的存在。在k=1的异质弦模型中,需要用威尔逊线打破非阿贝尔的大统一理论对称性,同时保持弱超荷的大统一理论嵌入和大统一理论预测sin^2θ_w(M(GUT))=3/8,这必然意味着模型包含分数电荷的态。这样的状态受到观测的严格限制,必须是有限的或足够大和稀释的。我们构造了第一个准现实的异质弦模型,其中奇异态不出现在无质量谱中,而只存在于有质量谱中。SO(10)GUT对称性破缺到Pati-Salam子群。我们的PS杂合弦模型包含足够的希格斯表象来打破大统一理论和电弱对称性,以及可以用于丢失伙伴机制的彩色希格斯三重态。通过对Pati-Salam真空空间的统计采样,我们证明了完全不含无质量外来物的准现实三代模型的丰富性,使得在这个模型空间中获得现实的汤川耦合是可能的。

英文摘要:

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 sin^2θ_w(M(GUT))=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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