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Spectra in Standard-like Z_3 Orbifold Models

机译:标准Z_3 Orbifold模型中的光谱

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摘要

General features of the spectra of matter states in all 175 models found in a previous work by the author are discussed. Only twenty patterns of representations are found to occur. Accomodation of the Minimal Supersymmetric Standard Model (MSSM) spectrum is addressed. States beyond those contained in the MSSM and nonstandard hypercharge normalization are shown to be generic, though some models do allow for the usual hypercharge normalization found in SU(5) embeddings of the Standard Model gauge group. The minimum value of the hypercharge normalization consistent with accomodation of the MSSM is determined for each model. In some cases, the normalization can be smaller than that corresponding to an SU(5) embedding of the Standard Model gauge group, similar to what has been found in free fermionic models. Bizzare hypercharges typically occur for exotic states, allowing for matter which does not occur in the decomposition of SU(5) representations---a result which has been noted many times before in four-dimensional string models. Only one of the twenty patterns of representations, comprising seven of the 175 models, is found to be without an anomalous U(1). The sizes of nonvanishing vacuum expectation values induced by the anomalous U(1) are studied. It is found that large radius moduli stabilization may lead to the breakdown of sigma-model perturbativity. Various quantities of interest in effective supergravity model building are tabulated for the set of 175 models. In particular, it is found that string moduli masses appear to be generically quite near the gravitino mass. String scale gauge coupling unification is shown to be possible, albeit contrived, in an example model. The intermediate scales of exotic particles are estimated and the degree of fine-tuning is studied.
机译:讨论了作者在先前的工作中发现的所有175个模型中物质状态谱的一般特征。发现只有二十种表示形式发生。解决了最小超对称标准模型(MSSM)频谱的适应问题。尽管某些模型的确允许在标准模型量规组的SU(5)嵌入中找到通常的高电荷归一化,但超出了MSSM和非标准高电荷归一化所包含的状态被证明是通用的。对于每个模型,确定与MSSM的容纳一致的过充电归一化的最小值。在某些情况下,归一化可以小于对应于标准模型量规组的SU(5)嵌入的归一化,类似于在自由费米离子模型中发现的归一化。 Bizzare高电荷通常发生在奇异状态,允许物质在SU(5)表示的分解中不发生-这是在四维字符串模型中多次提到的结果。发现包括175个模型中的7个在内的二十种表示模式中的一种没有异常U(1)。研究了由异常U(1)引起的真空消失期望值的大小。已经发现,大的半径模量稳定化可能导致sigma模型微扰度的破坏。对于这套175个模型,列表中列出了对有效超重力模型构建的各种关注。特别地,发现弦模量总体上似乎很接近引力质量。在一个示例模型中,尽管有人为作法,但显示了弦标尺耦合统一是可行的。估计外来粒子的中间尺度,并研究微调的程度。

著录项

  • 作者

    Giedt, J;

  • 作者单位
  • 年度 2001
  • 总页数
  • 原文格式 PDF
  • 正文语种 eng
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