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arXiv 0712.2845hep-th
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II型定向褶皱中的D膜瞬子效应:局域和整体问题

D-brane instanton effects in Type II orientifolds: local and global issues

Mirjam Cvetic, Robert Richter, Timo Weigand

摘要:

我们回顾了D-膜瞬子如何在超势中产生违反全局阿贝尔对称性的弦层次的开弦耦合,因此是微扰禁止的。我们讨论了这种机制的主要成分,具体集中在欧几里德$D2$ -膜在IIA型orientifold紧化。特别强调的是把一个仔细的分析瞬子零模式和分类的情况下,导致超势或更高的费米子F-条款。这包括讨论手征和非手征瞬子复合,视为多瞬子效应。作为唯象应用,我们讨论了SU(5)大统一模型中微扰禁戒汤川耦合的产生和右手中微子的Majorana质量。最后我们分析了$D1$ -瞬子在$D9$ -膜和稳定全纯丛的I型紧化中的镜像对偶描述。我们提出了全球定义的半现实弦真空椭圆纤维卡-丘实现非微扰产生的马约拉纳质量。

英文摘要:

We review how D-brane instantons can generate open string couplings of stringy hierarchy in the superpotential which violate global abelian symmetries and are therefore perturbatively forbidden. We discuss the main ingredients of this mechanism, focussing for concreteness on Euclidean $D2$-branes in Type IIA orientifold compactifications. Special emphasis is put on a careful analysis of instanton zero modes and a classification of situations leading to superpotential or higher fermionic F-terms. This includes the discussion of chiral and non-chiral instanton recombination, viewed as a multi-instanton effect. As phenomenological applications we discuss the generation of perturbatively forbidden Yukawa couplings in SU(5) GUT models and Majorana masses for right-handed neutrinos. Finally we analyse the mirror dual description of $D1$-instantons in Type I compactifications with $D9$-branes and stable holomorphic bundles. We present globally defined semi-realistic string vacua on an elliptically fibered Calabi-Yau realising the non-perturbative generation of Majorana masses.

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