Non-tachyonic semi-realistic non-supersymmetric heterotic-string vacua

Non-tachyonic semi-realistic non-supersymmetric heterotic-string vacua
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非快子半实在非超对称异质弦真空

DOI:
10.1140/epjc/s10052-016-4056-2
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发表时间:
2016
期刊:
The European Physical Journal C
影响因子:
--
通讯作者:
Ashfaque J
Ashfaque J
中科院分区:
--
文献类型:
--
作者:
Ashfaque J

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自由费米子表述中的杂化弦模型产生了一些迄今为止最真实的弦模型,它们具有时空超对称性。在大型强子对撞机上缺乏超对称性的证据,激发了人们对非超对称异质弦真空的兴趣。我们探讨在这种情况下,从准现实的自由费米模型可能会学到什么。我们表明,与非现实的例子,通常可能只包含一个这样的部门相比,家庭数量少的建设引起先验快子生产部门的扩散。原因是,在现实情况下,内部六维空间被分割成更小的单元。我们提出了一个准现实的,非超对称的,非快子的,异质弦真空的例子,并比较其无质量光谱的结构,相应的超对称真空。虽然在某些扇区中,超对称性被明确破缺,即玻色子和费米子扇区产生无质量和有质量的状态,但其他扇区,特别是那些导致手征族的扇区,继续表现出费米-玻色简并。在这些扇区中,与超对称情况相比,无质量谱仅在某些局部或整体U(1)荷中有所不同。我们讨论了在这些模型中获得无质量水平的条件。我们的例子模型包含一个非对称的U(1)对称性,它在弦微扰理论中产生一个单圈阶的蝌蚪图。我们推测,这种蝌蚪图可能会取消相应的图所产生的单圈不为零的真空能量,在这方面的超对称和非超对称真空应被视为平等的基础。最后讨论了包含两个超对称生成扇区的真空。
The heterotic-string models in the free fermionic formulation gave rise to some of the most realistic-string models to date, which possessspacetime supersymmetry. Lack of evidence for supersymmetry at the LHC instigated recent interest in non-supersymmetric heterotic-string vacua. We explore what may be learned in this context from the quasi-realistic free fermionic models. We show that constructions with a low number of families give rise to proliferation of a priori tachyon producing sectors, compared to the non-realistic examples, which typically may contain only one such sector. The reason being that in the realistic cases the internal six dimensional space is fragmented into smaller units. We present one example of a quasi-realistic, non-supersymmetric, non-tachyonic, heterotic-string vacuum and compare the structure of its massless spectrum to the corresponding supersymmetric vacuum. While in some sectors supersymmetry is broken explicitly, i.e. the bosonic and fermionic sectors produce massless and massive states, other sectors, and in particular those leading to the chiral families, continue to exhibit Fermi–Bose degeneracy. In these sectors the massless spectrum, as compared to the supersymmetric cases, will only differ in some local or globalU(1) charges. We discuss the conditions for obtainingat the massless level in these models. Our example model contains an anomalousU(1) symmetry, which generates a tadpole diagram at one-loop order in string perturbation theory. We speculate that this tadpole diagram may cancel the corresponding diagram generated by the one-loop non-vanishing vacuum energy and that in this respect the supersymmetric and non-supersymmetric vacua should be regarded on an equal footing. Finally we discuss vacua that contain two supersymmetry generating sectors.
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