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arXiv 0901.4350hep-th
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局域弦模型的规范阈值修正

Gauge Threshold Corrections for Local String Models

Joseph P. Conlon

摘要:

我们研究嵌入在一个大的紧凑空间的局部膜模型的规范阈值修正。大体积对小西异常和超Weyl异常有重要贡献,有效场论分析表明统一尺度应从M_s到RM_s以一种与模型无关的方式增强。对于局部D3/D3模型,显式字符串计算支持该结果。在这种情况下,尺度RM_s来自于由局部模型产生的RR蝌蚪的全局消除的必要性。我们还研究了D3/D 7模型,并讨论了与有效场论分析的差异。我们评论规范耦合统一和大统一尺度的唯象影响。

英文摘要:

We study gauge threshold corrections for local brane models embedded in a large compact space. A large bulk volume gives important contributions to the Konishi and super-Weyl anomalies and the effective field theory analysis implies the unification scale should be enhanced in a model-independent way from M_s to R M_s. For local D3/D3 models this result is supported by the explicit string computations. In this case the scale R M_s comes from the necessity of global cancellation of RR tadpoles sourced by the local model. We also study D3/D7 models and discuss discrepancies with the effective field theory analysis. We comment on phenomenological implications for gauge coupling unification and for the GUT scale.

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