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arXiv 1502.01362hep-ph
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可视化具有高尺度阈值的规范统一

Visualizing gauge unification with high-scale thresholds

Sebastian A. R. Ellis, James D. Wells

摘要:

规范耦合统一的检验需要知道统一的弱标度和高标度之间的阈值。如果这些尺度是远远分开的,就像文献中考虑的大多数统一方案中的情况一样,任务可以分解为IR和UV分析。我们提倡“$Δλ$ plots”作为一个有效的IR分析投射到高尺度。来自这些图的数据对高尺度下所需的阈值校正的大小给出了直接的定性指导(例如,高尺度表征的指数),并提供了测试假设的高尺度统一理论的可行性所需的精确定量数据。这种方法更清楚地显示了大秩群中非超对称大统一的合理前景,也显示了超对称统一所需的高尺度阈值修正的低总和值。后者可能意味着基于弱尺度超对称性理论的高尺度阈值的调谐取消。由于这个原因,我们认为非超对称统一是一样可行的超对称统一时,我们只局限于合理的高尺度阈值校正所需的精确统一的问题。我们说明了这些功能的非超对称$SO(10)$格伦德统一理论和超对称$SU(5)$理论。

英文摘要:

Tests of gauge coupling unification require knowledge of thresholds between the weak scale and the high scale of unification. If these scales are far separated, as is the case in most unification scenarios considered in the literature, the task can be factorized into IR and UV analyses. We advocate "$Δλ$ plots" as an efficient IR analysis projected to the high scale. The data from these plots gives an immediate qualitative guide to the size of threshold corrections needed at the high scale (e.g., the indices of high-scale representations) and provides precise quantitative data needed to test the viability of hypothesized high-scale unification theories. Such an approach shows more clearly the reasonable prospects of non-supersymmetric grand unification in large rank groups, and also shows the low summed values of high-scale threshold corrections required for supersymmetric unification. The latter may imply tuned cancellations of high-scale thresholds in theories based on weak-scale supersymmetry. For that reason we view non-supersymmetric unification to be just as viable as supersymmetric unification when confining ourselves only to the question of reasonable high-scale threshold corrections needed for exact unification. We illustrate these features for a non-supersymmetric $SO(10)$ graund unified theory and a supersymmetric $SU(5)$ theory.

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