论文标题
旨在分类来自速度十维异质弦真空的无速元模型
Towards the Classification of Tachyon-Free Models From Tachyonic Ten-Dimensional Heterotic String Vacua
论文作者
论文摘要
最近有人提出，十维速度弦真空吸尘器可以作为构建无tachyon的可行四维现象学弦模型的起点。这是通过使用投影仪以外的投影仪在超对称型号和$ SO SO（16）\ times So（16）$异源字符串中使用的投影仪以外的其他投影仪在四维型号中投射Tachyon来实现的。我们通过开发系统的计算机化工具来探索这类模型，以进行分类，分析其速度和无质量光谱以及对其分区功能和真空能量的分析。我们在此类中探索一个随机生成的空间，为$ 2 \ times10^9 $ string vacua，发现tachyon（无$ \ sim 5 \ sim 5 \ times 10^{ - 3} $概率发生，以及这些现象学上倾斜的$ so（10）$ so（10）$ vacua with $ a_ _____ {00} = n_b^0-n_b^0-n_b^0-n_b^0 $ e.e。无质量状态，发生频率$ \ sim 2 \ times 10^{ - 6} $。因此，提取大量的现象学真空需要适应我们讨论的生育条件，并显着增加无tachyon模型的频率。我们的结果表明，即使在普朗克量表上，时空超对称性也可能不是现象学弦模型中的必要成分。
Recently it was proposed that ten-dimensional tachyonic string vacua may serve as starting points for the construction of viable four dimensional phenomenological string models which are tachyon free. This is achieved by projecting out the tachyons in the four-dimensional models using projectors other than the projector which is utilised in the supersymmetric models and those of the $SO(16)\times SO(16)$ heterotic string. We continue the exploration of this class of models by developing systematic computerised tools for their classification, the analysis of their tachyonic and massless spectra, as well as analysis of their partition functions and vacuum energy. We explore a randomly generated space of $2\times10^9$ string vacua in this class and find that tachyon--free models occur with $\sim 5\times 10^{-3}$ probability, and of those, phenomenologically inclined $SO(10)$ vacua with $a_{00}=N_b^0-N_f^0=0$, i.e. equal number of fermionic and bosonic massless states, occur with frequency $\sim 2\times 10^{-6}$. Extracting larger numbers of phenomenological vacua therefore requires adaptation of fertility conditions that we discuss, and significantly increase the frequency of tachyon--free models. Our results suggest that spacetime supersymmetry may not be a necessary ingredient in phenomenological string models, even at the Planck scale.
