交叉膜景观尾部的多样性
Diversity in the Tail of the Intersecting Brane Landscape
摘要：
技术开发用于探索的完整空间的相交膜模型上的orientifold。通过计算具有负蝌蚪贡献的膜的所有组合，可以对广泛研究的T^6/Z_2 x Z_2定向折叠的所有解进行分类。这提供了必要的信息，以系统和有效地识别具有特定特征的该类中的所有模型。特别是，所有的方法，其中所需的群G可以实现一个系统的相交膜可以列举在多项式时间。我们确定了规范群SU（3）x SU（2）和SU（3）x SU（2）x U（1）的所有不同的膜实现，它们可以嵌入到与蝌蚪和超对称性约束相容的任何模型中。我们计算了“夸克”的世代数的分布，发现与其他奇数世代数相比，3既没有被抑制，也没有特别增强。模型的总体分布被发现有一个长尾。尽管K-理论约束对尾部模型有不成比例的抑制，但分布中的尾部包含了低能物理结构的许多多样性。
英文摘要：
Techniques are developed for exploring the complete space of intersecting brane models on an orientifold. The classification of all solutions for the widely-studied T^6/Z_2 x Z_2 orientifold is made possible by computing all combinations of branes with negative tadpole contributions. This provides the necessary information to systematically and efficiently identify all models in this class with specific characteristics. In particular, all ways in which a desired group G can be realized by a system of intersecting branes can be enumerated in polynomial time. We identify all distinct brane realizations of the gauge groups SU(3) x SU(2) and SU(3) x SU(2) x U(1) which can be embedded in any model which is compatible with the tadpole and SUSY constraints. We compute the distribution of the number of generations of "quarks" and find that 3 is neither suppressed nor particularly enhanced compared to other odd generation numbers. The overall distribution of models is found to have a long tail. Despite disproportionate suppression of models in the tail by K-theory constraints, the tail in the distribution contains much of the diversity of low-energy physics structure.
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